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authorLinus Torvalds <torvalds@linux-foundation.org>2008-04-21 18:40:24 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-21 18:40:24 -0400
commitec965350bb98bd291eb34f6ecddfdcfc36da1e6e (patch)
tree983bcaf33ed00b48a86f7f8790cc460cf15dd252 /kernel
parent5f033bb9bc5cb3bb37a79e3ef131f50ecdcb72b0 (diff)
parent486fdae21458bd9f4e125099bb3c38a4064e450e (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-devel
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-devel: (62 commits) sched: build fix sched: better rt-group documentation sched: features fix sched: /debug/sched_features sched: add SCHED_FEAT_DEADLINE sched: debug: show a weight tree sched: fair: weight calculations sched: fair-group: de-couple load-balancing from the rb-trees sched: fair-group scheduling vs latency sched: rt-group: optimize dequeue_rt_stack sched: debug: add some debug code to handle the full hierarchy sched: fair-group: SMP-nice for group scheduling sched, cpuset: customize sched domains, core sched, cpuset: customize sched domains, docs sched: prepatory code movement sched: rt: multi level group constraints sched: task_group hierarchy sched: fix the task_group hierarchy for UID grouping sched: allow the group scheduler to have multiple levels sched: mix tasks and groups ...
Diffstat (limited to 'kernel')
-rw-r--r--kernel/compat.c2
-rw-r--r--kernel/cpu.c6
-rw-r--r--kernel/cpuset.c100
-rw-r--r--kernel/irq/chip.c2
-rw-r--r--kernel/kmod.c2
-rw-r--r--kernel/kthread.c1
-rw-r--r--kernel/latencytop.c27
-rw-r--r--kernel/rcupreempt.c4
-rw-r--r--kernel/rcutorture.c15
-rw-r--r--kernel/sched.c1912
-rw-r--r--kernel/sched_debug.c36
-rw-r--r--kernel/sched_fair.c580
-rw-r--r--kernel/sched_features.h10
-rw-r--r--kernel/sched_rt.c227
-rw-r--r--kernel/sched_stats.h8
-rw-r--r--kernel/softirq.c63
-rw-r--r--kernel/stop_machine.c2
-rw-r--r--kernel/sysctl.c15
-rw-r--r--kernel/time/tick-sched.c5
-rw-r--r--kernel/user.c30
20 files changed, 2357 insertions, 690 deletions
diff --git a/kernel/compat.c b/kernel/compat.c
index 9c48abfcd4a5..e1ef04870c2a 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -445,7 +445,7 @@ asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
445 if (retval) 445 if (retval)
446 return retval; 446 return retval;
447 447
448 return sched_setaffinity(pid, new_mask); 448 return sched_setaffinity(pid, &new_mask);
449} 449}
450 450
451asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 451asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 2eff3f63abed..2011ad8d2697 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -232,9 +232,9 @@ static int _cpu_down(unsigned int cpu, int tasks_frozen)
232 232
233 /* Ensure that we are not runnable on dying cpu */ 233 /* Ensure that we are not runnable on dying cpu */
234 old_allowed = current->cpus_allowed; 234 old_allowed = current->cpus_allowed;
235 tmp = CPU_MASK_ALL; 235 cpus_setall(tmp);
236 cpu_clear(cpu, tmp); 236 cpu_clear(cpu, tmp);
237 set_cpus_allowed(current, tmp); 237 set_cpus_allowed_ptr(current, &tmp);
238 238
239 p = __stop_machine_run(take_cpu_down, &tcd_param, cpu); 239 p = __stop_machine_run(take_cpu_down, &tcd_param, cpu);
240 240
@@ -268,7 +268,7 @@ static int _cpu_down(unsigned int cpu, int tasks_frozen)
268out_thread: 268out_thread:
269 err = kthread_stop(p); 269 err = kthread_stop(p);
270out_allowed: 270out_allowed:
271 set_cpus_allowed(current, old_allowed); 271 set_cpus_allowed_ptr(current, &old_allowed);
272out_release: 272out_release:
273 cpu_hotplug_done(); 273 cpu_hotplug_done();
274 return err; 274 return err;
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index a1b61f414228..8b35fbd8292f 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -98,6 +98,9 @@ struct cpuset {
98 /* partition number for rebuild_sched_domains() */ 98 /* partition number for rebuild_sched_domains() */
99 int pn; 99 int pn;
100 100
101 /* for custom sched domain */
102 int relax_domain_level;
103
101 /* used for walking a cpuset heirarchy */ 104 /* used for walking a cpuset heirarchy */
102 struct list_head stack_list; 105 struct list_head stack_list;
103}; 106};
@@ -478,6 +481,16 @@ static int cpusets_overlap(struct cpuset *a, struct cpuset *b)
478 return cpus_intersects(a->cpus_allowed, b->cpus_allowed); 481 return cpus_intersects(a->cpus_allowed, b->cpus_allowed);
479} 482}
480 483
484static void
485update_domain_attr(struct sched_domain_attr *dattr, struct cpuset *c)
486{
487 if (!dattr)
488 return;
489 if (dattr->relax_domain_level < c->relax_domain_level)
490 dattr->relax_domain_level = c->relax_domain_level;
491 return;
492}
493
481/* 494/*
482 * rebuild_sched_domains() 495 * rebuild_sched_domains()
483 * 496 *
@@ -553,12 +566,14 @@ static void rebuild_sched_domains(void)
553 int csn; /* how many cpuset ptrs in csa so far */ 566 int csn; /* how many cpuset ptrs in csa so far */
554 int i, j, k; /* indices for partition finding loops */ 567 int i, j, k; /* indices for partition finding loops */
555 cpumask_t *doms; /* resulting partition; i.e. sched domains */ 568 cpumask_t *doms; /* resulting partition; i.e. sched domains */
569 struct sched_domain_attr *dattr; /* attributes for custom domains */
556 int ndoms; /* number of sched domains in result */ 570 int ndoms; /* number of sched domains in result */
557 int nslot; /* next empty doms[] cpumask_t slot */ 571 int nslot; /* next empty doms[] cpumask_t slot */
558 572
559 q = NULL; 573 q = NULL;
560 csa = NULL; 574 csa = NULL;
561 doms = NULL; 575 doms = NULL;
576 dattr = NULL;
562 577
563 /* Special case for the 99% of systems with one, full, sched domain */ 578 /* Special case for the 99% of systems with one, full, sched domain */
564 if (is_sched_load_balance(&top_cpuset)) { 579 if (is_sched_load_balance(&top_cpuset)) {
@@ -566,6 +581,11 @@ static void rebuild_sched_domains(void)
566 doms = kmalloc(sizeof(cpumask_t), GFP_KERNEL); 581 doms = kmalloc(sizeof(cpumask_t), GFP_KERNEL);
567 if (!doms) 582 if (!doms)
568 goto rebuild; 583 goto rebuild;
584 dattr = kmalloc(sizeof(struct sched_domain_attr), GFP_KERNEL);
585 if (dattr) {
586 *dattr = SD_ATTR_INIT;
587 update_domain_attr(dattr, &top_cpuset);
588 }
569 *doms = top_cpuset.cpus_allowed; 589 *doms = top_cpuset.cpus_allowed;
570 goto rebuild; 590 goto rebuild;
571 } 591 }
@@ -622,6 +642,7 @@ restart:
622 doms = kmalloc(ndoms * sizeof(cpumask_t), GFP_KERNEL); 642 doms = kmalloc(ndoms * sizeof(cpumask_t), GFP_KERNEL);
623 if (!doms) 643 if (!doms)
624 goto rebuild; 644 goto rebuild;
645 dattr = kmalloc(ndoms * sizeof(struct sched_domain_attr), GFP_KERNEL);
625 646
626 for (nslot = 0, i = 0; i < csn; i++) { 647 for (nslot = 0, i = 0; i < csn; i++) {
627 struct cpuset *a = csa[i]; 648 struct cpuset *a = csa[i];
@@ -644,12 +665,15 @@ restart:
644 } 665 }
645 666
646 cpus_clear(*dp); 667 cpus_clear(*dp);
668 if (dattr)
669 *(dattr + nslot) = SD_ATTR_INIT;
647 for (j = i; j < csn; j++) { 670 for (j = i; j < csn; j++) {
648 struct cpuset *b = csa[j]; 671 struct cpuset *b = csa[j];
649 672
650 if (apn == b->pn) { 673 if (apn == b->pn) {
651 cpus_or(*dp, *dp, b->cpus_allowed); 674 cpus_or(*dp, *dp, b->cpus_allowed);
652 b->pn = -1; 675 b->pn = -1;
676 update_domain_attr(dattr, b);
653 } 677 }
654 } 678 }
655 nslot++; 679 nslot++;
@@ -660,7 +684,7 @@ restart:
660rebuild: 684rebuild:
661 /* Have scheduler rebuild sched domains */ 685 /* Have scheduler rebuild sched domains */
662 get_online_cpus(); 686 get_online_cpus();
663 partition_sched_domains(ndoms, doms); 687 partition_sched_domains(ndoms, doms, dattr);
664 put_online_cpus(); 688 put_online_cpus();
665 689
666done: 690done:
@@ -668,6 +692,7 @@ done:
668 kfifo_free(q); 692 kfifo_free(q);
669 kfree(csa); 693 kfree(csa);
670 /* Don't kfree(doms) -- partition_sched_domains() does that. */ 694 /* Don't kfree(doms) -- partition_sched_domains() does that. */
695 /* Don't kfree(dattr) -- partition_sched_domains() does that. */
671} 696}
672 697
673static inline int started_after_time(struct task_struct *t1, 698static inline int started_after_time(struct task_struct *t1,
@@ -729,7 +754,7 @@ int cpuset_test_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan)
729 */ 754 */
730void cpuset_change_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan) 755void cpuset_change_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan)
731{ 756{
732 set_cpus_allowed(tsk, (cgroup_cs(scan->cg))->cpus_allowed); 757 set_cpus_allowed_ptr(tsk, &((cgroup_cs(scan->cg))->cpus_allowed));
733} 758}
734 759
735/** 760/**
@@ -1011,6 +1036,21 @@ static int update_memory_pressure_enabled(struct cpuset *cs, char *buf)
1011 return 0; 1036 return 0;
1012} 1037}
1013 1038
1039static int update_relax_domain_level(struct cpuset *cs, char *buf)
1040{
1041 int val = simple_strtol(buf, NULL, 10);
1042
1043 if (val < 0)
1044 val = -1;
1045
1046 if (val != cs->relax_domain_level) {
1047 cs->relax_domain_level = val;
1048 rebuild_sched_domains();
1049 }
1050
1051 return 0;
1052}
1053
1014/* 1054/*
1015 * update_flag - read a 0 or a 1 in a file and update associated flag 1055 * update_flag - read a 0 or a 1 in a file and update associated flag
1016 * bit: the bit to update (CS_CPU_EXCLUSIVE, CS_MEM_EXCLUSIVE, 1056 * bit: the bit to update (CS_CPU_EXCLUSIVE, CS_MEM_EXCLUSIVE,
@@ -1178,7 +1218,7 @@ static void cpuset_attach(struct cgroup_subsys *ss,
1178 1218
1179 mutex_lock(&callback_mutex); 1219 mutex_lock(&callback_mutex);
1180 guarantee_online_cpus(cs, &cpus); 1220 guarantee_online_cpus(cs, &cpus);
1181 set_cpus_allowed(tsk, cpus); 1221 set_cpus_allowed_ptr(tsk, &cpus);
1182 mutex_unlock(&callback_mutex); 1222 mutex_unlock(&callback_mutex);
1183 1223
1184 from = oldcs->mems_allowed; 1224 from = oldcs->mems_allowed;
@@ -1202,6 +1242,7 @@ typedef enum {
1202 FILE_CPU_EXCLUSIVE, 1242 FILE_CPU_EXCLUSIVE,
1203 FILE_MEM_EXCLUSIVE, 1243 FILE_MEM_EXCLUSIVE,
1204 FILE_SCHED_LOAD_BALANCE, 1244 FILE_SCHED_LOAD_BALANCE,
1245 FILE_SCHED_RELAX_DOMAIN_LEVEL,
1205 FILE_MEMORY_PRESSURE_ENABLED, 1246 FILE_MEMORY_PRESSURE_ENABLED,
1206 FILE_MEMORY_PRESSURE, 1247 FILE_MEMORY_PRESSURE,
1207 FILE_SPREAD_PAGE, 1248 FILE_SPREAD_PAGE,
@@ -1256,6 +1297,9 @@ static ssize_t cpuset_common_file_write(struct cgroup *cont,
1256 case FILE_SCHED_LOAD_BALANCE: 1297 case FILE_SCHED_LOAD_BALANCE:
1257 retval = update_flag(CS_SCHED_LOAD_BALANCE, cs, buffer); 1298 retval = update_flag(CS_SCHED_LOAD_BALANCE, cs, buffer);
1258 break; 1299 break;
1300 case FILE_SCHED_RELAX_DOMAIN_LEVEL:
1301 retval = update_relax_domain_level(cs, buffer);
1302 break;
1259 case FILE_MEMORY_MIGRATE: 1303 case FILE_MEMORY_MIGRATE:
1260 retval = update_flag(CS_MEMORY_MIGRATE, cs, buffer); 1304 retval = update_flag(CS_MEMORY_MIGRATE, cs, buffer);
1261 break; 1305 break;
@@ -1354,6 +1398,9 @@ static ssize_t cpuset_common_file_read(struct cgroup *cont,
1354 case FILE_SCHED_LOAD_BALANCE: 1398 case FILE_SCHED_LOAD_BALANCE:
1355 *s++ = is_sched_load_balance(cs) ? '1' : '0'; 1399 *s++ = is_sched_load_balance(cs) ? '1' : '0';
1356 break; 1400 break;
1401 case FILE_SCHED_RELAX_DOMAIN_LEVEL:
1402 s += sprintf(s, "%d", cs->relax_domain_level);
1403 break;
1357 case FILE_MEMORY_MIGRATE: 1404 case FILE_MEMORY_MIGRATE:
1358 *s++ = is_memory_migrate(cs) ? '1' : '0'; 1405 *s++ = is_memory_migrate(cs) ? '1' : '0';
1359 break; 1406 break;
@@ -1424,6 +1471,13 @@ static struct cftype cft_sched_load_balance = {
1424 .private = FILE_SCHED_LOAD_BALANCE, 1471 .private = FILE_SCHED_LOAD_BALANCE,
1425}; 1472};
1426 1473
1474static struct cftype cft_sched_relax_domain_level = {
1475 .name = "sched_relax_domain_level",
1476 .read = cpuset_common_file_read,
1477 .write = cpuset_common_file_write,
1478 .private = FILE_SCHED_RELAX_DOMAIN_LEVEL,
1479};
1480
1427static struct cftype cft_memory_migrate = { 1481static struct cftype cft_memory_migrate = {
1428 .name = "memory_migrate", 1482 .name = "memory_migrate",
1429 .read = cpuset_common_file_read, 1483 .read = cpuset_common_file_read,
@@ -1475,6 +1529,9 @@ static int cpuset_populate(struct cgroup_subsys *ss, struct cgroup *cont)
1475 return err; 1529 return err;
1476 if ((err = cgroup_add_file(cont, ss, &cft_sched_load_balance)) < 0) 1530 if ((err = cgroup_add_file(cont, ss, &cft_sched_load_balance)) < 0)
1477 return err; 1531 return err;
1532 if ((err = cgroup_add_file(cont, ss,
1533 &cft_sched_relax_domain_level)) < 0)
1534 return err;
1478 if ((err = cgroup_add_file(cont, ss, &cft_memory_pressure)) < 0) 1535 if ((err = cgroup_add_file(cont, ss, &cft_memory_pressure)) < 0)
1479 return err; 1536 return err;
1480 if ((err = cgroup_add_file(cont, ss, &cft_spread_page)) < 0) 1537 if ((err = cgroup_add_file(cont, ss, &cft_spread_page)) < 0)
@@ -1555,10 +1612,11 @@ static struct cgroup_subsys_state *cpuset_create(
1555 if (is_spread_slab(parent)) 1612 if (is_spread_slab(parent))
1556 set_bit(CS_SPREAD_SLAB, &cs->flags); 1613 set_bit(CS_SPREAD_SLAB, &cs->flags);
1557 set_bit(CS_SCHED_LOAD_BALANCE, &cs->flags); 1614 set_bit(CS_SCHED_LOAD_BALANCE, &cs->flags);
1558 cs->cpus_allowed = CPU_MASK_NONE; 1615 cpus_clear(cs->cpus_allowed);
1559 cs->mems_allowed = NODE_MASK_NONE; 1616 nodes_clear(cs->mems_allowed);
1560 cs->mems_generation = cpuset_mems_generation++; 1617 cs->mems_generation = cpuset_mems_generation++;
1561 fmeter_init(&cs->fmeter); 1618 fmeter_init(&cs->fmeter);
1619 cs->relax_domain_level = -1;
1562 1620
1563 cs->parent = parent; 1621 cs->parent = parent;
1564 number_of_cpusets++; 1622 number_of_cpusets++;
@@ -1625,12 +1683,13 @@ int __init cpuset_init(void)
1625{ 1683{
1626 int err = 0; 1684 int err = 0;
1627 1685
1628 top_cpuset.cpus_allowed = CPU_MASK_ALL; 1686 cpus_setall(top_cpuset.cpus_allowed);
1629 top_cpuset.mems_allowed = NODE_MASK_ALL; 1687 nodes_setall(top_cpuset.mems_allowed);
1630 1688
1631 fmeter_init(&top_cpuset.fmeter); 1689 fmeter_init(&top_cpuset.fmeter);
1632 top_cpuset.mems_generation = cpuset_mems_generation++; 1690 top_cpuset.mems_generation = cpuset_mems_generation++;
1633 set_bit(CS_SCHED_LOAD_BALANCE, &top_cpuset.flags); 1691 set_bit(CS_SCHED_LOAD_BALANCE, &top_cpuset.flags);
1692 top_cpuset.relax_domain_level = -1;
1634 1693
1635 err = register_filesystem(&cpuset_fs_type); 1694 err = register_filesystem(&cpuset_fs_type);
1636 if (err < 0) 1695 if (err < 0)
@@ -1844,6 +1903,7 @@ void __init cpuset_init_smp(void)
1844 1903
1845 * cpuset_cpus_allowed - return cpus_allowed mask from a tasks cpuset. 1904 * cpuset_cpus_allowed - return cpus_allowed mask from a tasks cpuset.
1846 * @tsk: pointer to task_struct from which to obtain cpuset->cpus_allowed. 1905 * @tsk: pointer to task_struct from which to obtain cpuset->cpus_allowed.
1906 * @pmask: pointer to cpumask_t variable to receive cpus_allowed set.
1847 * 1907 *
1848 * Description: Returns the cpumask_t cpus_allowed of the cpuset 1908 * Description: Returns the cpumask_t cpus_allowed of the cpuset
1849 * attached to the specified @tsk. Guaranteed to return some non-empty 1909 * attached to the specified @tsk. Guaranteed to return some non-empty
@@ -1851,35 +1911,27 @@ void __init cpuset_init_smp(void)
1851 * tasks cpuset. 1911 * tasks cpuset.
1852 **/ 1912 **/
1853 1913
1854cpumask_t cpuset_cpus_allowed(struct task_struct *tsk) 1914void cpuset_cpus_allowed(struct task_struct *tsk, cpumask_t *pmask)
1855{ 1915{
1856 cpumask_t mask;
1857
1858 mutex_lock(&callback_mutex); 1916 mutex_lock(&callback_mutex);
1859 mask = cpuset_cpus_allowed_locked(tsk); 1917 cpuset_cpus_allowed_locked(tsk, pmask);
1860 mutex_unlock(&callback_mutex); 1918 mutex_unlock(&callback_mutex);
1861
1862 return mask;
1863} 1919}
1864 1920
1865/** 1921/**
1866 * cpuset_cpus_allowed_locked - return cpus_allowed mask from a tasks cpuset. 1922 * cpuset_cpus_allowed_locked - return cpus_allowed mask from a tasks cpuset.
1867 * Must be called with callback_mutex held. 1923 * Must be called with callback_mutex held.
1868 **/ 1924 **/
1869cpumask_t cpuset_cpus_allowed_locked(struct task_struct *tsk) 1925void cpuset_cpus_allowed_locked(struct task_struct *tsk, cpumask_t *pmask)
1870{ 1926{
1871 cpumask_t mask;
1872
1873 task_lock(tsk); 1927 task_lock(tsk);
1874 guarantee_online_cpus(task_cs(tsk), &mask); 1928 guarantee_online_cpus(task_cs(tsk), pmask);
1875 task_unlock(tsk); 1929 task_unlock(tsk);
1876
1877 return mask;
1878} 1930}
1879 1931
1880void cpuset_init_current_mems_allowed(void) 1932void cpuset_init_current_mems_allowed(void)
1881{ 1933{
1882 current->mems_allowed = NODE_MASK_ALL; 1934 nodes_setall(current->mems_allowed);
1883} 1935}
1884 1936
1885/** 1937/**
@@ -2261,8 +2313,16 @@ void cpuset_task_status_allowed(struct seq_file *m, struct task_struct *task)
2261 m->count += cpumask_scnprintf(m->buf + m->count, m->size - m->count, 2313 m->count += cpumask_scnprintf(m->buf + m->count, m->size - m->count,
2262 task->cpus_allowed); 2314 task->cpus_allowed);
2263 seq_printf(m, "\n"); 2315 seq_printf(m, "\n");
2316 seq_printf(m, "Cpus_allowed_list:\t");
2317 m->count += cpulist_scnprintf(m->buf + m->count, m->size - m->count,
2318 task->cpus_allowed);
2319 seq_printf(m, "\n");
2264 seq_printf(m, "Mems_allowed:\t"); 2320 seq_printf(m, "Mems_allowed:\t");
2265 m->count += nodemask_scnprintf(m->buf + m->count, m->size - m->count, 2321 m->count += nodemask_scnprintf(m->buf + m->count, m->size - m->count,
2266 task->mems_allowed); 2322 task->mems_allowed);
2267 seq_printf(m, "\n"); 2323 seq_printf(m, "\n");
2324 seq_printf(m, "Mems_allowed_list:\t");
2325 m->count += nodelist_scnprintf(m->buf + m->count, m->size - m->count,
2326 task->mems_allowed);
2327 seq_printf(m, "\n");
2268} 2328}
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index fdb3fbe2b0c4..964964baefa2 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -47,7 +47,7 @@ void dynamic_irq_init(unsigned int irq)
47 desc->irq_count = 0; 47 desc->irq_count = 0;
48 desc->irqs_unhandled = 0; 48 desc->irqs_unhandled = 0;
49#ifdef CONFIG_SMP 49#ifdef CONFIG_SMP
50 desc->affinity = CPU_MASK_ALL; 50 cpus_setall(desc->affinity);
51#endif 51#endif
52 spin_unlock_irqrestore(&desc->lock, flags); 52 spin_unlock_irqrestore(&desc->lock, flags);
53} 53}
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 22be3ff3f363..e2764047ec03 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -165,7 +165,7 @@ static int ____call_usermodehelper(void *data)
165 } 165 }
166 166
167 /* We can run anywhere, unlike our parent keventd(). */ 167 /* We can run anywhere, unlike our parent keventd(). */
168 set_cpus_allowed(current, CPU_MASK_ALL); 168 set_cpus_allowed_ptr(current, CPU_MASK_ALL_PTR);
169 169
170 /* 170 /*
171 * Our parent is keventd, which runs with elevated scheduling priority. 171 * Our parent is keventd, which runs with elevated scheduling priority.
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 0ac887882f90..25241d6ec8cd 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -180,6 +180,7 @@ void kthread_bind(struct task_struct *k, unsigned int cpu)
180 wait_task_inactive(k); 180 wait_task_inactive(k);
181 set_task_cpu(k, cpu); 181 set_task_cpu(k, cpu);
182 k->cpus_allowed = cpumask_of_cpu(cpu); 182 k->cpus_allowed = cpumask_of_cpu(cpu);
183 k->rt.nr_cpus_allowed = 1;
183} 184}
184EXPORT_SYMBOL(kthread_bind); 185EXPORT_SYMBOL(kthread_bind);
185 186
diff --git a/kernel/latencytop.c b/kernel/latencytop.c
index b4e3c85abe74..7c74dab0d21b 100644
--- a/kernel/latencytop.c
+++ b/kernel/latencytop.c
@@ -64,8 +64,8 @@ account_global_scheduler_latency(struct task_struct *tsk, struct latency_record
64 return; 64 return;
65 65
66 for (i = 0; i < MAXLR; i++) { 66 for (i = 0; i < MAXLR; i++) {
67 int q; 67 int q, same = 1;
68 int same = 1; 68
69 /* Nothing stored: */ 69 /* Nothing stored: */
70 if (!latency_record[i].backtrace[0]) { 70 if (!latency_record[i].backtrace[0]) {
71 if (firstnonnull > i) 71 if (firstnonnull > i)
@@ -73,12 +73,15 @@ account_global_scheduler_latency(struct task_struct *tsk, struct latency_record
73 continue; 73 continue;
74 } 74 }
75 for (q = 0 ; q < LT_BACKTRACEDEPTH ; q++) { 75 for (q = 0 ; q < LT_BACKTRACEDEPTH ; q++) {
76 if (latency_record[i].backtrace[q] != 76 unsigned long record = lat->backtrace[q];
77 lat->backtrace[q]) 77
78 if (latency_record[i].backtrace[q] != record) {
78 same = 0; 79 same = 0;
79 if (same && lat->backtrace[q] == 0)
80 break; 80 break;
81 if (same && lat->backtrace[q] == ULONG_MAX) 81 }
82
83 /* 0 and ULONG_MAX entries mean end of backtrace: */
84 if (record == 0 || record == ULONG_MAX)
82 break; 85 break;
83 } 86 }
84 if (same) { 87 if (same) {
@@ -143,14 +146,18 @@ account_scheduler_latency(struct task_struct *tsk, int usecs, int inter)
143 for (i = 0; i < LT_SAVECOUNT ; i++) { 146 for (i = 0; i < LT_SAVECOUNT ; i++) {
144 struct latency_record *mylat; 147 struct latency_record *mylat;
145 int same = 1; 148 int same = 1;
149
146 mylat = &tsk->latency_record[i]; 150 mylat = &tsk->latency_record[i];
147 for (q = 0 ; q < LT_BACKTRACEDEPTH ; q++) { 151 for (q = 0 ; q < LT_BACKTRACEDEPTH ; q++) {
148 if (mylat->backtrace[q] != 152 unsigned long record = lat.backtrace[q];
149 lat.backtrace[q]) 153
154 if (mylat->backtrace[q] != record) {
150 same = 0; 155 same = 0;
151 if (same && lat.backtrace[q] == 0)
152 break; 156 break;
153 if (same && lat.backtrace[q] == ULONG_MAX) 157 }
158
159 /* 0 and ULONG_MAX entries mean end of backtrace: */
160 if (record == 0 || record == ULONG_MAX)
154 break; 161 break;
155 } 162 }
156 if (same) { 163 if (same) {
diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c
index e9517014b57c..e1cdf196a515 100644
--- a/kernel/rcupreempt.c
+++ b/kernel/rcupreempt.c
@@ -1007,10 +1007,10 @@ void __synchronize_sched(void)
1007 if (sched_getaffinity(0, &oldmask) < 0) 1007 if (sched_getaffinity(0, &oldmask) < 0)
1008 oldmask = cpu_possible_map; 1008 oldmask = cpu_possible_map;
1009 for_each_online_cpu(cpu) { 1009 for_each_online_cpu(cpu) {
1010 sched_setaffinity(0, cpumask_of_cpu(cpu)); 1010 sched_setaffinity(0, &cpumask_of_cpu(cpu));
1011 schedule(); 1011 schedule();
1012 } 1012 }
1013 sched_setaffinity(0, oldmask); 1013 sched_setaffinity(0, &oldmask);
1014} 1014}
1015EXPORT_SYMBOL_GPL(__synchronize_sched); 1015EXPORT_SYMBOL_GPL(__synchronize_sched);
1016 1016
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index fd599829e72a..47894f919d4e 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -723,9 +723,10 @@ static int rcu_idle_cpu; /* Force all torture tasks off this CPU */
723 */ 723 */
724static void rcu_torture_shuffle_tasks(void) 724static void rcu_torture_shuffle_tasks(void)
725{ 725{
726 cpumask_t tmp_mask = CPU_MASK_ALL; 726 cpumask_t tmp_mask;
727 int i; 727 int i;
728 728
729 cpus_setall(tmp_mask);
729 get_online_cpus(); 730 get_online_cpus();
730 731
731 /* No point in shuffling if there is only one online CPU (ex: UP) */ 732 /* No point in shuffling if there is only one online CPU (ex: UP) */
@@ -737,25 +738,27 @@ static void rcu_torture_shuffle_tasks(void)
737 if (rcu_idle_cpu != -1) 738 if (rcu_idle_cpu != -1)
738 cpu_clear(rcu_idle_cpu, tmp_mask); 739 cpu_clear(rcu_idle_cpu, tmp_mask);
739 740
740 set_cpus_allowed(current, tmp_mask); 741 set_cpus_allowed_ptr(current, &tmp_mask);
741 742
742 if (reader_tasks) { 743 if (reader_tasks) {
743 for (i = 0; i < nrealreaders; i++) 744 for (i = 0; i < nrealreaders; i++)
744 if (reader_tasks[i]) 745 if (reader_tasks[i])
745 set_cpus_allowed(reader_tasks[i], tmp_mask); 746 set_cpus_allowed_ptr(reader_tasks[i],
747 &tmp_mask);
746 } 748 }
747 749
748 if (fakewriter_tasks) { 750 if (fakewriter_tasks) {
749 for (i = 0; i < nfakewriters; i++) 751 for (i = 0; i < nfakewriters; i++)
750 if (fakewriter_tasks[i]) 752 if (fakewriter_tasks[i])
751 set_cpus_allowed(fakewriter_tasks[i], tmp_mask); 753 set_cpus_allowed_ptr(fakewriter_tasks[i],
754 &tmp_mask);
752 } 755 }
753 756
754 if (writer_task) 757 if (writer_task)
755 set_cpus_allowed(writer_task, tmp_mask); 758 set_cpus_allowed_ptr(writer_task, &tmp_mask);
756 759
757 if (stats_task) 760 if (stats_task)
758 set_cpus_allowed(stats_task, tmp_mask); 761 set_cpus_allowed_ptr(stats_task, &tmp_mask);
759 762
760 if (rcu_idle_cpu == -1) 763 if (rcu_idle_cpu == -1)
761 rcu_idle_cpu = num_online_cpus() - 1; 764 rcu_idle_cpu = num_online_cpus() - 1;
diff --git a/kernel/sched.c b/kernel/sched.c
index 8dcdec6fe0fe..57ba7ea9b744 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -66,6 +66,10 @@
66#include <linux/unistd.h> 66#include <linux/unistd.h>
67#include <linux/pagemap.h> 67#include <linux/pagemap.h>
68#include <linux/hrtimer.h> 68#include <linux/hrtimer.h>
69#include <linux/tick.h>
70#include <linux/bootmem.h>
71#include <linux/debugfs.h>
72#include <linux/ctype.h>
69 73
70#include <asm/tlb.h> 74#include <asm/tlb.h>
71#include <asm/irq_regs.h> 75#include <asm/irq_regs.h>
@@ -114,6 +118,11 @@ unsigned long long __attribute__((weak)) sched_clock(void)
114 */ 118 */
115#define DEF_TIMESLICE (100 * HZ / 1000) 119#define DEF_TIMESLICE (100 * HZ / 1000)
116 120
121/*
122 * single value that denotes runtime == period, ie unlimited time.
123 */
124#define RUNTIME_INF ((u64)~0ULL)
125
117#ifdef CONFIG_SMP 126#ifdef CONFIG_SMP
118/* 127/*
119 * Divide a load by a sched group cpu_power : (load / sg->__cpu_power) 128 * Divide a load by a sched group cpu_power : (load / sg->__cpu_power)
@@ -155,6 +164,84 @@ struct rt_prio_array {
155 struct list_head queue[MAX_RT_PRIO]; 164 struct list_head queue[MAX_RT_PRIO];
156}; 165};
157 166
167struct rt_bandwidth {
168 /* nests inside the rq lock: */
169 spinlock_t rt_runtime_lock;
170 ktime_t rt_period;
171 u64 rt_runtime;
172 struct hrtimer rt_period_timer;
173};
174
175static struct rt_bandwidth def_rt_bandwidth;
176
177static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun);
178
179static enum hrtimer_restart sched_rt_period_timer(struct hrtimer *timer)
180{
181 struct rt_bandwidth *rt_b =
182 container_of(timer, struct rt_bandwidth, rt_period_timer);
183 ktime_t now;
184 int overrun;
185 int idle = 0;
186
187 for (;;) {
188 now = hrtimer_cb_get_time(timer);
189 overrun = hrtimer_forward(timer, now, rt_b->rt_period);
190
191 if (!overrun)
192 break;
193
194 idle = do_sched_rt_period_timer(rt_b, overrun);
195 }
196
197 return idle ? HRTIMER_NORESTART : HRTIMER_RESTART;
198}
199
200static
201void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime)
202{
203 rt_b->rt_period = ns_to_ktime(period);
204 rt_b->rt_runtime = runtime;
205
206 spin_lock_init(&rt_b->rt_runtime_lock);
207
208 hrtimer_init(&rt_b->rt_period_timer,
209 CLOCK_MONOTONIC, HRTIMER_MODE_REL);
210 rt_b->rt_period_timer.function = sched_rt_period_timer;
211 rt_b->rt_period_timer.cb_mode = HRTIMER_CB_IRQSAFE_NO_SOFTIRQ;
212}
213
214static void start_rt_bandwidth(struct rt_bandwidth *rt_b)
215{
216 ktime_t now;
217
218 if (rt_b->rt_runtime == RUNTIME_INF)
219 return;
220
221 if (hrtimer_active(&rt_b->rt_period_timer))
222 return;
223
224 spin_lock(&rt_b->rt_runtime_lock);
225 for (;;) {
226 if (hrtimer_active(&rt_b->rt_period_timer))
227 break;
228
229 now = hrtimer_cb_get_time(&rt_b->rt_period_timer);
230 hrtimer_forward(&rt_b->rt_period_timer, now, rt_b->rt_period);
231 hrtimer_start(&rt_b->rt_period_timer,
232 rt_b->rt_period_timer.expires,
233 HRTIMER_MODE_ABS);
234 }
235 spin_unlock(&rt_b->rt_runtime_lock);
236}
237
238#ifdef CONFIG_RT_GROUP_SCHED
239static void destroy_rt_bandwidth(struct rt_bandwidth *rt_b)
240{
241 hrtimer_cancel(&rt_b->rt_period_timer);
242}
243#endif
244
158#ifdef CONFIG_GROUP_SCHED 245#ifdef CONFIG_GROUP_SCHED
159 246
160#include <linux/cgroup.h> 247#include <linux/cgroup.h>
@@ -181,29 +268,39 @@ struct task_group {
181 struct sched_rt_entity **rt_se; 268 struct sched_rt_entity **rt_se;
182 struct rt_rq **rt_rq; 269 struct rt_rq **rt_rq;
183 270
184 u64 rt_runtime; 271 struct rt_bandwidth rt_bandwidth;
185#endif 272#endif
186 273
187 struct rcu_head rcu; 274 struct rcu_head rcu;
188 struct list_head list; 275 struct list_head list;
276
277 struct task_group *parent;
278 struct list_head siblings;
279 struct list_head children;
189}; 280};
190 281
282#ifdef CONFIG_USER_SCHED
283
284/*
285 * Root task group.
286 * Every UID task group (including init_task_group aka UID-0) will
287 * be a child to this group.
288 */
289struct task_group root_task_group;
290
191#ifdef CONFIG_FAIR_GROUP_SCHED 291#ifdef CONFIG_FAIR_GROUP_SCHED
192/* Default task group's sched entity on each cpu */ 292/* Default task group's sched entity on each cpu */
193static DEFINE_PER_CPU(struct sched_entity, init_sched_entity); 293static DEFINE_PER_CPU(struct sched_entity, init_sched_entity);
194/* Default task group's cfs_rq on each cpu */ 294/* Default task group's cfs_rq on each cpu */
195static DEFINE_PER_CPU(struct cfs_rq, init_cfs_rq) ____cacheline_aligned_in_smp; 295static DEFINE_PER_CPU(struct cfs_rq, init_cfs_rq) ____cacheline_aligned_in_smp;
196
197static struct sched_entity *init_sched_entity_p[NR_CPUS];
198static struct cfs_rq *init_cfs_rq_p[NR_CPUS];
199#endif 296#endif
200 297
201#ifdef CONFIG_RT_GROUP_SCHED 298#ifdef CONFIG_RT_GROUP_SCHED
202static DEFINE_PER_CPU(struct sched_rt_entity, init_sched_rt_entity); 299static DEFINE_PER_CPU(struct sched_rt_entity, init_sched_rt_entity);
203static DEFINE_PER_CPU(struct rt_rq, init_rt_rq) ____cacheline_aligned_in_smp; 300static DEFINE_PER_CPU(struct rt_rq, init_rt_rq) ____cacheline_aligned_in_smp;
204 301#endif
205static struct sched_rt_entity *init_sched_rt_entity_p[NR_CPUS]; 302#else
206static struct rt_rq *init_rt_rq_p[NR_CPUS]; 303#define root_task_group init_task_group
207#endif 304#endif
208 305
209/* task_group_lock serializes add/remove of task groups and also changes to 306/* task_group_lock serializes add/remove of task groups and also changes to
@@ -221,23 +318,15 @@ static DEFINE_MUTEX(doms_cur_mutex);
221# define INIT_TASK_GROUP_LOAD NICE_0_LOAD 318# define INIT_TASK_GROUP_LOAD NICE_0_LOAD
222#endif 319#endif
223 320
321#define MIN_SHARES 2
322
224static int init_task_group_load = INIT_TASK_GROUP_LOAD; 323static int init_task_group_load = INIT_TASK_GROUP_LOAD;
225#endif 324#endif
226 325
227/* Default task group. 326/* Default task group.
228 * Every task in system belong to this group at bootup. 327 * Every task in system belong to this group at bootup.
229 */ 328 */
230struct task_group init_task_group = { 329struct task_group init_task_group;
231#ifdef CONFIG_FAIR_GROUP_SCHED
232 .se = init_sched_entity_p,
233 .cfs_rq = init_cfs_rq_p,
234#endif
235
236#ifdef CONFIG_RT_GROUP_SCHED
237 .rt_se = init_sched_rt_entity_p,
238 .rt_rq = init_rt_rq_p,
239#endif
240};
241 330
242/* return group to which a task belongs */ 331/* return group to which a task belongs */
243static inline struct task_group *task_group(struct task_struct *p) 332static inline struct task_group *task_group(struct task_struct *p)
@@ -297,8 +386,12 @@ struct cfs_rq {
297 386
298 struct rb_root tasks_timeline; 387 struct rb_root tasks_timeline;
299 struct rb_node *rb_leftmost; 388 struct rb_node *rb_leftmost;
300 struct rb_node *rb_load_balance_curr; 389
301 /* 'curr' points to currently running entity on this cfs_rq. 390 struct list_head tasks;
391 struct list_head *balance_iterator;
392
393 /*
394 * 'curr' points to currently running entity on this cfs_rq.
302 * It is set to NULL otherwise (i.e when none are currently running). 395 * It is set to NULL otherwise (i.e when none are currently running).
303 */ 396 */
304 struct sched_entity *curr, *next; 397 struct sched_entity *curr, *next;
@@ -318,6 +411,43 @@ struct cfs_rq {
318 */ 411 */
319 struct list_head leaf_cfs_rq_list; 412 struct list_head leaf_cfs_rq_list;
320 struct task_group *tg; /* group that "owns" this runqueue */ 413 struct task_group *tg; /* group that "owns" this runqueue */
414
415#ifdef CONFIG_SMP
416 unsigned long task_weight;
417 unsigned long shares;
418 /*
419 * We need space to build a sched_domain wide view of the full task
420 * group tree, in order to avoid depending on dynamic memory allocation
421 * during the load balancing we place this in the per cpu task group
422 * hierarchy. This limits the load balancing to one instance per cpu,
423 * but more should not be needed anyway.
424 */
425 struct aggregate_struct {
426 /*
427 * load = weight(cpus) * f(tg)
428 *
429 * Where f(tg) is the recursive weight fraction assigned to
430 * this group.
431 */
432 unsigned long load;
433
434 /*
435 * part of the group weight distributed to this span.
436 */
437 unsigned long shares;
438
439 /*
440 * The sum of all runqueue weights within this span.
441 */
442 unsigned long rq_weight;
443
444 /*
445 * Weight contributed by tasks; this is the part we can
446 * influence by moving tasks around.
447 */
448 unsigned long task_weight;
449 } aggregate;
450#endif
321#endif 451#endif
322}; 452};
323 453
@@ -334,6 +464,9 @@ struct rt_rq {
334#endif 464#endif
335 int rt_throttled; 465 int rt_throttled;
336 u64 rt_time; 466 u64 rt_time;
467 u64 rt_runtime;
468 /* Nests inside the rq lock: */
469 spinlock_t rt_runtime_lock;
337 470
338#ifdef CONFIG_RT_GROUP_SCHED 471#ifdef CONFIG_RT_GROUP_SCHED
339 unsigned long rt_nr_boosted; 472 unsigned long rt_nr_boosted;
@@ -396,6 +529,7 @@ struct rq {
396 unsigned long cpu_load[CPU_LOAD_IDX_MAX]; 529 unsigned long cpu_load[CPU_LOAD_IDX_MAX];
397 unsigned char idle_at_tick; 530 unsigned char idle_at_tick;
398#ifdef CONFIG_NO_HZ 531#ifdef CONFIG_NO_HZ
532 unsigned long last_tick_seen;
399 unsigned char in_nohz_recently; 533 unsigned char in_nohz_recently;
400#endif 534#endif
401 /* capture load from *all* tasks on this cpu: */ 535 /* capture load from *all* tasks on this cpu: */
@@ -405,8 +539,6 @@ struct rq {
405 539
406 struct cfs_rq cfs; 540 struct cfs_rq cfs;
407 struct rt_rq rt; 541 struct rt_rq rt;
408 u64 rt_period_expire;
409 int rt_throttled;
410 542
411#ifdef CONFIG_FAIR_GROUP_SCHED 543#ifdef CONFIG_FAIR_GROUP_SCHED
412 /* list of leaf cfs_rq on this cpu: */ 544 /* list of leaf cfs_rq on this cpu: */
@@ -499,6 +631,32 @@ static inline int cpu_of(struct rq *rq)
499#endif 631#endif
500} 632}
501 633
634#ifdef CONFIG_NO_HZ
635static inline bool nohz_on(int cpu)
636{
637 return tick_get_tick_sched(cpu)->nohz_mode != NOHZ_MODE_INACTIVE;
638}
639
640static inline u64 max_skipped_ticks(struct rq *rq)
641{
642 return nohz_on(cpu_of(rq)) ? jiffies - rq->last_tick_seen + 2 : 1;
643}
644
645static inline void update_last_tick_seen(struct rq *rq)
646{
647 rq->last_tick_seen = jiffies;
648}
649#else
650static inline u64 max_skipped_ticks(struct rq *rq)
651{
652 return 1;
653}
654
655static inline void update_last_tick_seen(struct rq *rq)
656{
657}
658#endif
659
502/* 660/*
503 * Update the per-runqueue clock, as finegrained as the platform can give 661 * Update the per-runqueue clock, as finegrained as the platform can give
504 * us, but without assuming monotonicity, etc.: 662 * us, but without assuming monotonicity, etc.:
@@ -523,9 +681,12 @@ static void __update_rq_clock(struct rq *rq)
523 /* 681 /*
524 * Catch too large forward jumps too: 682 * Catch too large forward jumps too:
525 */ 683 */
526 if (unlikely(clock + delta > rq->tick_timestamp + TICK_NSEC)) { 684 u64 max_jump = max_skipped_ticks(rq) * TICK_NSEC;
527 if (clock < rq->tick_timestamp + TICK_NSEC) 685 u64 max_time = rq->tick_timestamp + max_jump;
528 clock = rq->tick_timestamp + TICK_NSEC; 686
687 if (unlikely(clock + delta > max_time)) {
688 if (clock < max_time)
689 clock = max_time;
529 else 690 else
530 clock++; 691 clock++;
531 rq->clock_overflows++; 692 rq->clock_overflows++;
@@ -561,23 +722,6 @@ static void update_rq_clock(struct rq *rq)
561#define task_rq(p) cpu_rq(task_cpu(p)) 722#define task_rq(p) cpu_rq(task_cpu(p))
562#define cpu_curr(cpu) (cpu_rq(cpu)->curr) 723#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
563 724
564unsigned long rt_needs_cpu(int cpu)
565{
566 struct rq *rq = cpu_rq(cpu);
567 u64 delta;
568
569 if (!rq->rt_throttled)
570 return 0;
571
572 if (rq->clock > rq->rt_period_expire)
573 return 1;
574
575 delta = rq->rt_period_expire - rq->clock;
576 do_div(delta, NSEC_PER_SEC / HZ);
577
578 return (unsigned long)delta;
579}
580
581/* 725/*
582 * Tunables that become constants when CONFIG_SCHED_DEBUG is off: 726 * Tunables that become constants when CONFIG_SCHED_DEBUG is off:
583 */ 727 */
@@ -590,22 +734,137 @@ unsigned long rt_needs_cpu(int cpu)
590/* 734/*
591 * Debugging: various feature bits 735 * Debugging: various feature bits
592 */ 736 */
737
738#define SCHED_FEAT(name, enabled) \
739 __SCHED_FEAT_##name ,
740
593enum { 741enum {
594 SCHED_FEAT_NEW_FAIR_SLEEPERS = 1, 742#include "sched_features.h"
595 SCHED_FEAT_WAKEUP_PREEMPT = 2,
596 SCHED_FEAT_START_DEBIT = 4,
597 SCHED_FEAT_HRTICK = 8,
598 SCHED_FEAT_DOUBLE_TICK = 16,
599}; 743};
600 744
745#undef SCHED_FEAT
746
747#define SCHED_FEAT(name, enabled) \
748 (1UL << __SCHED_FEAT_##name) * enabled |
749
601const_debug unsigned int sysctl_sched_features = 750const_debug unsigned int sysctl_sched_features =
602 SCHED_FEAT_NEW_FAIR_SLEEPERS * 1 | 751#include "sched_features.h"
603 SCHED_FEAT_WAKEUP_PREEMPT * 1 | 752 0;
604 SCHED_FEAT_START_DEBIT * 1 | 753
605 SCHED_FEAT_HRTICK * 1 | 754#undef SCHED_FEAT
606 SCHED_FEAT_DOUBLE_TICK * 0; 755
756#ifdef CONFIG_SCHED_DEBUG
757#define SCHED_FEAT(name, enabled) \
758 #name ,
759
760__read_mostly char *sched_feat_names[] = {
761#include "sched_features.h"
762 NULL
763};
764
765#undef SCHED_FEAT
766
767int sched_feat_open(struct inode *inode, struct file *filp)
768{
769 filp->private_data = inode->i_private;
770 return 0;
771}
772
773static ssize_t
774sched_feat_read(struct file *filp, char __user *ubuf,
775 size_t cnt, loff_t *ppos)
776{
777 char *buf;
778 int r = 0;
779 int len = 0;
780 int i;
607 781
608#define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x) 782 for (i = 0; sched_feat_names[i]; i++) {
783 len += strlen(sched_feat_names[i]);
784 len += 4;
785 }
786
787 buf = kmalloc(len + 2, GFP_KERNEL);
788 if (!buf)
789 return -ENOMEM;
790
791 for (i = 0; sched_feat_names[i]; i++) {
792 if (sysctl_sched_features & (1UL << i))
793 r += sprintf(buf + r, "%s ", sched_feat_names[i]);
794 else
795 r += sprintf(buf + r, "NO_%s ", sched_feat_names[i]);
796 }
797
798 r += sprintf(buf + r, "\n");
799 WARN_ON(r >= len + 2);
800
801 r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
802
803 kfree(buf);
804
805 return r;
806}
807
808static ssize_t
809sched_feat_write(struct file *filp, const char __user *ubuf,
810 size_t cnt, loff_t *ppos)
811{
812 char buf[64];
813 char *cmp = buf;
814 int neg = 0;
815 int i;
816
817 if (cnt > 63)
818 cnt = 63;
819
820 if (copy_from_user(&buf, ubuf, cnt))
821 return -EFAULT;
822
823 buf[cnt] = 0;
824
825 if (strncmp(buf, "NO_", 3) == 0) {
826 neg = 1;
827 cmp += 3;
828 }
829
830 for (i = 0; sched_feat_names[i]; i++) {
831 int len = strlen(sched_feat_names[i]);
832
833 if (strncmp(cmp, sched_feat_names[i], len) == 0) {
834 if (neg)
835 sysctl_sched_features &= ~(1UL << i);
836 else
837 sysctl_sched_features |= (1UL << i);
838 break;
839 }
840 }
841
842 if (!sched_feat_names[i])
843 return -EINVAL;
844
845 filp->f_pos += cnt;
846
847 return cnt;
848}
849
850static struct file_operations sched_feat_fops = {
851 .open = sched_feat_open,
852 .read = sched_feat_read,
853 .write = sched_feat_write,
854};
855
856static __init int sched_init_debug(void)
857{
858 debugfs_create_file("sched_features", 0644, NULL, NULL,
859 &sched_feat_fops);
860
861 return 0;
862}
863late_initcall(sched_init_debug);
864
865#endif
866
867#define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
609 868
610/* 869/*
611 * Number of tasks to iterate in a single balance run. 870 * Number of tasks to iterate in a single balance run.
@@ -627,16 +886,52 @@ static __read_mostly int scheduler_running;
627 */ 886 */
628int sysctl_sched_rt_runtime = 950000; 887int sysctl_sched_rt_runtime = 950000;
629 888
630/* 889static inline u64 global_rt_period(void)
631 * single value that denotes runtime == period, ie unlimited time. 890{
632 */ 891 return (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
633#define RUNTIME_INF ((u64)~0ULL) 892}
893
894static inline u64 global_rt_runtime(void)
895{
896 if (sysctl_sched_rt_period < 0)
897 return RUNTIME_INF;
898
899 return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC;
900}
901
902static const unsigned long long time_sync_thresh = 100000;
903
904static DEFINE_PER_CPU(unsigned long long, time_offset);
905static DEFINE_PER_CPU(unsigned long long, prev_cpu_time);
634 906
635/* 907/*
636 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu 908 * Global lock which we take every now and then to synchronize
637 * clock constructed from sched_clock(): 909 * the CPUs time. This method is not warp-safe, but it's good
910 * enough to synchronize slowly diverging time sources and thus
911 * it's good enough for tracing:
638 */ 912 */
639unsigned long long cpu_clock(int cpu) 913static DEFINE_SPINLOCK(time_sync_lock);
914static unsigned long long prev_global_time;
915
916static unsigned long long __sync_cpu_clock(cycles_t time, int cpu)
917{
918 unsigned long flags;
919
920 spin_lock_irqsave(&time_sync_lock, flags);
921
922 if (time < prev_global_time) {
923 per_cpu(time_offset, cpu) += prev_global_time - time;
924 time = prev_global_time;
925 } else {
926 prev_global_time = time;
927 }
928
929 spin_unlock_irqrestore(&time_sync_lock, flags);
930
931 return time;
932}
933
934static unsigned long long __cpu_clock(int cpu)
640{ 935{
641 unsigned long long now; 936 unsigned long long now;
642 unsigned long flags; 937 unsigned long flags;
@@ -657,6 +952,24 @@ unsigned long long cpu_clock(int cpu)
657 952
658 return now; 953 return now;
659} 954}
955
956/*
957 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
958 * clock constructed from sched_clock():
959 */
960unsigned long long cpu_clock(int cpu)
961{
962 unsigned long long prev_cpu_time, time, delta_time;
963
964 prev_cpu_time = per_cpu(prev_cpu_time, cpu);
965 time = __cpu_clock(cpu) + per_cpu(time_offset, cpu);
966 delta_time = time-prev_cpu_time;
967
968 if (unlikely(delta_time > time_sync_thresh))
969 time = __sync_cpu_clock(time, cpu);
970
971 return time;
972}
660EXPORT_SYMBOL_GPL(cpu_clock); 973EXPORT_SYMBOL_GPL(cpu_clock);
661 974
662#ifndef prepare_arch_switch 975#ifndef prepare_arch_switch
@@ -1116,6 +1429,9 @@ static void __resched_task(struct task_struct *p, int tif_bit)
1116 */ 1429 */
1117#define SRR(x, y) (((x) + (1UL << ((y) - 1))) >> (y)) 1430#define SRR(x, y) (((x) + (1UL << ((y) - 1))) >> (y))
1118 1431
1432/*
1433 * delta *= weight / lw
1434 */
1119static unsigned long 1435static unsigned long
1120calc_delta_mine(unsigned long delta_exec, unsigned long weight, 1436calc_delta_mine(unsigned long delta_exec, unsigned long weight,
1121 struct load_weight *lw) 1437 struct load_weight *lw)
@@ -1138,12 +1454,6 @@ calc_delta_mine(unsigned long delta_exec, unsigned long weight,
1138 return (unsigned long)min(tmp, (u64)(unsigned long)LONG_MAX); 1454 return (unsigned long)min(tmp, (u64)(unsigned long)LONG_MAX);
1139} 1455}
1140 1456
1141static inline unsigned long
1142calc_delta_fair(unsigned long delta_exec, struct load_weight *lw)
1143{
1144 return calc_delta_mine(delta_exec, NICE_0_LOAD, lw);
1145}
1146
1147static inline void update_load_add(struct load_weight *lw, unsigned long inc) 1457static inline void update_load_add(struct load_weight *lw, unsigned long inc)
1148{ 1458{
1149 lw->weight += inc; 1459 lw->weight += inc;
@@ -1241,11 +1551,390 @@ static void cpuacct_charge(struct task_struct *tsk, u64 cputime);
1241static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {} 1551static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {}
1242#endif 1552#endif
1243 1553
1554static inline void inc_cpu_load(struct rq *rq, unsigned long load)
1555{
1556 update_load_add(&rq->load, load);
1557}
1558
1559static inline void dec_cpu_load(struct rq *rq, unsigned long load)
1560{
1561 update_load_sub(&rq->load, load);
1562}
1563
1244#ifdef CONFIG_SMP 1564#ifdef CONFIG_SMP
1245static unsigned long source_load(int cpu, int type); 1565static unsigned long source_load(int cpu, int type);
1246static unsigned long target_load(int cpu, int type); 1566static unsigned long target_load(int cpu, int type);
1247static unsigned long cpu_avg_load_per_task(int cpu); 1567static unsigned long cpu_avg_load_per_task(int cpu);
1248static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd); 1568static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd);
1569
1570#ifdef CONFIG_FAIR_GROUP_SCHED
1571
1572/*
1573 * Group load balancing.
1574 *
1575 * We calculate a few balance domain wide aggregate numbers; load and weight.
1576 * Given the pictures below, and assuming each item has equal weight:
1577 *
1578 * root 1 - thread
1579 * / | \ A - group
1580 * A 1 B
1581 * /|\ / \
1582 * C 2 D 3 4
1583 * | |
1584 * 5 6
1585 *
1586 * load:
1587 * A and B get 1/3-rd of the total load. C and D get 1/3-rd of A's 1/3-rd,
1588 * which equals 1/9-th of the total load.
1589 *
1590 * shares:
1591 * The weight of this group on the selected cpus.
1592 *
1593 * rq_weight:
1594 * Direct sum of all the cpu's their rq weight, e.g. A would get 3 while
1595 * B would get 2.
1596 *
1597 * task_weight:
1598 * Part of the rq_weight contributed by tasks; all groups except B would
1599 * get 1, B gets 2.
1600 */
1601
1602static inline struct aggregate_struct *
1603aggregate(struct task_group *tg, struct sched_domain *sd)
1604{
1605 return &tg->cfs_rq[sd->first_cpu]->aggregate;
1606}
1607
1608typedef void (*aggregate_func)(struct task_group *, struct sched_domain *);
1609
1610/*
1611 * Iterate the full tree, calling @down when first entering a node and @up when
1612 * leaving it for the final time.
1613 */
1614static
1615void aggregate_walk_tree(aggregate_func down, aggregate_func up,
1616 struct sched_domain *sd)
1617{
1618 struct task_group *parent, *child;
1619
1620 rcu_read_lock();
1621 parent = &root_task_group;
1622down:
1623 (*down)(parent, sd);
1624 list_for_each_entry_rcu(child, &parent->children, siblings) {
1625 parent = child;
1626 goto down;
1627
1628up:
1629 continue;
1630 }
1631 (*up)(parent, sd);
1632
1633 child = parent;
1634 parent = parent->parent;
1635 if (parent)
1636 goto up;
1637 rcu_read_unlock();
1638}
1639
1640/*
1641 * Calculate the aggregate runqueue weight.
1642 */
1643static
1644void aggregate_group_weight(struct task_group *tg, struct sched_domain *sd)
1645{
1646 unsigned long rq_weight = 0;
1647 unsigned long task_weight = 0;
1648 int i;
1649
1650 for_each_cpu_mask(i, sd->span) {
1651 rq_weight += tg->cfs_rq[i]->load.weight;
1652 task_weight += tg->cfs_rq[i]->task_weight;
1653 }
1654
1655 aggregate(tg, sd)->rq_weight = rq_weight;
1656 aggregate(tg, sd)->task_weight = task_weight;
1657}
1658
1659/*
1660 * Redistribute tg->shares amongst all tg->cfs_rq[]s.
1661 */
1662static void __aggregate_redistribute_shares(struct task_group *tg)
1663{
1664 int i, max_cpu = smp_processor_id();
1665 unsigned long rq_weight = 0;
1666 unsigned long shares, max_shares = 0, shares_rem = tg->shares;
1667
1668 for_each_possible_cpu(i)
1669 rq_weight += tg->cfs_rq[i]->load.weight;
1670
1671 for_each_possible_cpu(i) {
1672 /*
1673 * divide shares proportional to the rq_weights.
1674 */
1675 shares = tg->shares * tg->cfs_rq[i]->load.weight;
1676 shares /= rq_weight + 1;
1677
1678 tg->cfs_rq[i]->shares = shares;
1679
1680 if (shares > max_shares) {
1681 max_shares = shares;
1682 max_cpu = i;
1683 }
1684 shares_rem -= shares;
1685 }
1686
1687 /*
1688 * Ensure it all adds up to tg->shares; we can loose a few
1689 * due to rounding down when computing the per-cpu shares.
1690 */
1691 if (shares_rem)
1692 tg->cfs_rq[max_cpu]->shares += shares_rem;
1693}
1694
1695/*
1696 * Compute the weight of this group on the given cpus.
1697 */
1698static
1699void aggregate_group_shares(struct task_group *tg, struct sched_domain *sd)
1700{
1701 unsigned long shares = 0;
1702 int i;
1703
1704again:
1705 for_each_cpu_mask(i, sd->span)
1706 shares += tg->cfs_rq[i]->shares;
1707
1708 /*
1709 * When the span doesn't have any shares assigned, but does have
1710 * tasks to run do a machine wide rebalance (should be rare).
1711 */
1712 if (unlikely(!shares && aggregate(tg, sd)->rq_weight)) {
1713 __aggregate_redistribute_shares(tg);
1714 goto again;
1715 }
1716
1717 aggregate(tg, sd)->shares = shares;
1718}
1719
1720/*
1721 * Compute the load fraction assigned to this group, relies on the aggregate
1722 * weight and this group's parent's load, i.e. top-down.
1723 */
1724static
1725void aggregate_group_load(struct task_group *tg, struct sched_domain *sd)
1726{
1727 unsigned long load;
1728
1729 if (!tg->parent) {
1730 int i;
1731
1732 load = 0;
1733 for_each_cpu_mask(i, sd->span)
1734 load += cpu_rq(i)->load.weight;
1735
1736 } else {
1737 load = aggregate(tg->parent, sd)->load;
1738
1739 /*
1740 * shares is our weight in the parent's rq so
1741 * shares/parent->rq_weight gives our fraction of the load
1742 */
1743 load *= aggregate(tg, sd)->shares;
1744 load /= aggregate(tg->parent, sd)->rq_weight + 1;
1745 }
1746
1747 aggregate(tg, sd)->load = load;
1748}
1749
1750static void __set_se_shares(struct sched_entity *se, unsigned long shares);
1751
1752/*
1753 * Calculate and set the cpu's group shares.
1754 */
1755static void
1756__update_group_shares_cpu(struct task_group *tg, struct sched_domain *sd,
1757 int tcpu)
1758{
1759 int boost = 0;
1760 unsigned long shares;
1761 unsigned long rq_weight;
1762
1763 if (!tg->se[tcpu])
1764 return;
1765
1766 rq_weight = tg->cfs_rq[tcpu]->load.weight;
1767
1768 /*
1769 * If there are currently no tasks on the cpu pretend there is one of
1770 * average load so that when a new task gets to run here it will not
1771 * get delayed by group starvation.
1772 */
1773 if (!rq_weight) {
1774 boost = 1;
1775 rq_weight = NICE_0_LOAD;
1776 }
1777
1778 /*
1779 * \Sum shares * rq_weight
1780 * shares = -----------------------
1781 * \Sum rq_weight
1782 *
1783 */
1784 shares = aggregate(tg, sd)->shares * rq_weight;
1785 shares /= aggregate(tg, sd)->rq_weight + 1;
1786
1787 /*
1788 * record the actual number of shares, not the boosted amount.
1789 */
1790 tg->cfs_rq[tcpu]->shares = boost ? 0 : shares;
1791
1792 if (shares < MIN_SHARES)
1793 shares = MIN_SHARES;
1794
1795 __set_se_shares(tg->se[tcpu], shares);
1796}
1797
1798/*
1799 * Re-adjust the weights on the cpu the task came from and on the cpu the
1800 * task went to.
1801 */
1802static void
1803__move_group_shares(struct task_group *tg, struct sched_domain *sd,
1804 int scpu, int dcpu)
1805{
1806 unsigned long shares;
1807
1808 shares = tg->cfs_rq[scpu]->shares + tg->cfs_rq[dcpu]->shares;
1809
1810 __update_group_shares_cpu(tg, sd, scpu);
1811 __update_group_shares_cpu(tg, sd, dcpu);
1812
1813 /*
1814 * ensure we never loose shares due to rounding errors in the
1815 * above redistribution.
1816 */
1817 shares -= tg->cfs_rq[scpu]->shares + tg->cfs_rq[dcpu]->shares;
1818 if (shares)
1819 tg->cfs_rq[dcpu]->shares += shares;
1820}
1821
1822/*
1823 * Because changing a group's shares changes the weight of the super-group
1824 * we need to walk up the tree and change all shares until we hit the root.
1825 */
1826static void
1827move_group_shares(struct task_group *tg, struct sched_domain *sd,
1828 int scpu, int dcpu)
1829{
1830 while (tg) {
1831 __move_group_shares(tg, sd, scpu, dcpu);
1832 tg = tg->parent;
1833 }
1834}
1835
1836static
1837void aggregate_group_set_shares(struct task_group *tg, struct sched_domain *sd)
1838{
1839 unsigned long shares = aggregate(tg, sd)->shares;
1840 int i;
1841
1842 for_each_cpu_mask(i, sd->span) {
1843 struct rq *rq = cpu_rq(i);
1844 unsigned long flags;
1845
1846 spin_lock_irqsave(&rq->lock, flags);
1847 __update_group_shares_cpu(tg, sd, i);
1848 spin_unlock_irqrestore(&rq->lock, flags);
1849 }
1850
1851 aggregate_group_shares(tg, sd);
1852
1853 /*
1854 * ensure we never loose shares due to rounding errors in the
1855 * above redistribution.
1856 */
1857 shares -= aggregate(tg, sd)->shares;
1858 if (shares) {
1859 tg->cfs_rq[sd->first_cpu]->shares += shares;
1860 aggregate(tg, sd)->shares += shares;
1861 }
1862}
1863
1864/*
1865 * Calculate the accumulative weight and recursive load of each task group
1866 * while walking down the tree.
1867 */
1868static
1869void aggregate_get_down(struct task_group *tg, struct sched_domain *sd)
1870{
1871 aggregate_group_weight(tg, sd);
1872 aggregate_group_shares(tg, sd);
1873 aggregate_group_load(tg, sd);
1874}
1875
1876/*
1877 * Rebalance the cpu shares while walking back up the tree.
1878 */
1879static
1880void aggregate_get_up(struct task_group *tg, struct sched_domain *sd)
1881{
1882 aggregate_group_set_shares(tg, sd);
1883}
1884
1885static DEFINE_PER_CPU(spinlock_t, aggregate_lock);
1886
1887static void __init init_aggregate(void)
1888{
1889 int i;
1890
1891 for_each_possible_cpu(i)
1892 spin_lock_init(&per_cpu(aggregate_lock, i));
1893}
1894
1895static int get_aggregate(struct sched_domain *sd)
1896{
1897 if (!spin_trylock(&per_cpu(aggregate_lock, sd->first_cpu)))
1898 return 0;
1899
1900 aggregate_walk_tree(aggregate_get_down, aggregate_get_up, sd);
1901 return 1;
1902}
1903
1904static void put_aggregate(struct sched_domain *sd)
1905{
1906 spin_unlock(&per_cpu(aggregate_lock, sd->first_cpu));
1907}
1908
1909static void cfs_rq_set_shares(struct cfs_rq *cfs_rq, unsigned long shares)
1910{
1911 cfs_rq->shares = shares;
1912}
1913
1914#else
1915
1916static inline void init_aggregate(void)
1917{
1918}
1919
1920static inline int get_aggregate(struct sched_domain *sd)
1921{
1922 return 0;
1923}
1924
1925static inline void put_aggregate(struct sched_domain *sd)
1926{
1927}
1928#endif
1929
1930#else /* CONFIG_SMP */
1931
1932#ifdef CONFIG_FAIR_GROUP_SCHED
1933static void cfs_rq_set_shares(struct cfs_rq *cfs_rq, unsigned long shares)
1934{
1935}
1936#endif
1937
1249#endif /* CONFIG_SMP */ 1938#endif /* CONFIG_SMP */
1250 1939
1251#include "sched_stats.h" 1940#include "sched_stats.h"
@@ -1258,26 +1947,14 @@ static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd);
1258 1947
1259#define sched_class_highest (&rt_sched_class) 1948#define sched_class_highest (&rt_sched_class)
1260 1949
1261static inline void inc_load(struct rq *rq, const struct task_struct *p) 1950static void inc_nr_running(struct rq *rq)
1262{
1263 update_load_add(&rq->load, p->se.load.weight);
1264}
1265
1266static inline void dec_load(struct rq *rq, const struct task_struct *p)
1267{
1268 update_load_sub(&rq->load, p->se.load.weight);
1269}
1270
1271static void inc_nr_running(struct task_struct *p, struct rq *rq)
1272{ 1951{
1273 rq->nr_running++; 1952 rq->nr_running++;
1274 inc_load(rq, p);
1275} 1953}
1276 1954
1277static void dec_nr_running(struct task_struct *p, struct rq *rq) 1955static void dec_nr_running(struct rq *rq)
1278{ 1956{
1279 rq->nr_running--; 1957 rq->nr_running--;
1280 dec_load(rq, p);
1281} 1958}
1282 1959
1283static void set_load_weight(struct task_struct *p) 1960static void set_load_weight(struct task_struct *p)
@@ -1369,7 +2046,7 @@ static void activate_task(struct rq *rq, struct task_struct *p, int wakeup)
1369 rq->nr_uninterruptible--; 2046 rq->nr_uninterruptible--;
1370 2047
1371 enqueue_task(rq, p, wakeup); 2048 enqueue_task(rq, p, wakeup);
1372 inc_nr_running(p, rq); 2049 inc_nr_running(rq);
1373} 2050}
1374 2051
1375/* 2052/*
@@ -1381,7 +2058,7 @@ static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep)
1381 rq->nr_uninterruptible++; 2058 rq->nr_uninterruptible++;
1382 2059
1383 dequeue_task(rq, p, sleep); 2060 dequeue_task(rq, p, sleep);
1384 dec_nr_running(p, rq); 2061 dec_nr_running(rq);
1385} 2062}
1386 2063
1387/** 2064/**
@@ -1438,7 +2115,7 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
1438 /* 2115 /*
1439 * Buddy candidates are cache hot: 2116 * Buddy candidates are cache hot:
1440 */ 2117 */
1441 if (&p->se == cfs_rq_of(&p->se)->next) 2118 if (sched_feat(CACHE_HOT_BUDDY) && (&p->se == cfs_rq_of(&p->se)->next))
1442 return 1; 2119 return 1;
1443 2120
1444 if (p->sched_class != &fair_sched_class) 2121 if (p->sched_class != &fair_sched_class)
@@ -1728,17 +2405,17 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p, int this_cpu)
1728 * find_idlest_cpu - find the idlest cpu among the cpus in group. 2405 * find_idlest_cpu - find the idlest cpu among the cpus in group.
1729 */ 2406 */
1730static int 2407static int
1731find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu) 2408find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu,
2409 cpumask_t *tmp)
1732{ 2410{
1733 cpumask_t tmp;
1734 unsigned long load, min_load = ULONG_MAX; 2411 unsigned long load, min_load = ULONG_MAX;
1735 int idlest = -1; 2412 int idlest = -1;
1736 int i; 2413 int i;
1737 2414
1738 /* Traverse only the allowed CPUs */ 2415 /* Traverse only the allowed CPUs */
1739 cpus_and(tmp, group->cpumask, p->cpus_allowed); 2416 cpus_and(*tmp, group->cpumask, p->cpus_allowed);
1740 2417
1741 for_each_cpu_mask(i, tmp) { 2418 for_each_cpu_mask(i, *tmp) {
1742 load = weighted_cpuload(i); 2419 load = weighted_cpuload(i);
1743 2420
1744 if (load < min_load || (load == min_load && i == this_cpu)) { 2421 if (load < min_load || (load == min_load && i == this_cpu)) {
@@ -1777,7 +2454,7 @@ static int sched_balance_self(int cpu, int flag)
1777 } 2454 }
1778 2455
1779 while (sd) { 2456 while (sd) {
1780 cpumask_t span; 2457 cpumask_t span, tmpmask;
1781 struct sched_group *group; 2458 struct sched_group *group;
1782 int new_cpu, weight; 2459 int new_cpu, weight;
1783 2460
@@ -1793,7 +2470,7 @@ static int sched_balance_self(int cpu, int flag)
1793 continue; 2470 continue;
1794 } 2471 }
1795 2472
1796 new_cpu = find_idlest_cpu(group, t, cpu); 2473 new_cpu = find_idlest_cpu(group, t, cpu, &tmpmask);
1797 if (new_cpu == -1 || new_cpu == cpu) { 2474 if (new_cpu == -1 || new_cpu == cpu) {
1798 /* Now try balancing at a lower domain level of cpu */ 2475 /* Now try balancing at a lower domain level of cpu */
1799 sd = sd->child; 2476 sd = sd->child;
@@ -1839,6 +2516,9 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
1839 long old_state; 2516 long old_state;
1840 struct rq *rq; 2517 struct rq *rq;
1841 2518
2519 if (!sched_feat(SYNC_WAKEUPS))
2520 sync = 0;
2521
1842 smp_wmb(); 2522 smp_wmb();
1843 rq = task_rq_lock(p, &flags); 2523 rq = task_rq_lock(p, &flags);
1844 old_state = p->state; 2524 old_state = p->state;
@@ -1955,6 +2635,7 @@ static void __sched_fork(struct task_struct *p)
1955 2635
1956 INIT_LIST_HEAD(&p->rt.run_list); 2636 INIT_LIST_HEAD(&p->rt.run_list);
1957 p->se.on_rq = 0; 2637 p->se.on_rq = 0;
2638 INIT_LIST_HEAD(&p->se.group_node);
1958 2639
1959#ifdef CONFIG_PREEMPT_NOTIFIERS 2640#ifdef CONFIG_PREEMPT_NOTIFIERS
1960 INIT_HLIST_HEAD(&p->preempt_notifiers); 2641 INIT_HLIST_HEAD(&p->preempt_notifiers);
@@ -2030,7 +2711,7 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
2030 * management (if any): 2711 * management (if any):
2031 */ 2712 */
2032 p->sched_class->task_new(rq, p); 2713 p->sched_class->task_new(rq, p);
2033 inc_nr_running(p, rq); 2714 inc_nr_running(rq);
2034 } 2715 }
2035 check_preempt_curr(rq, p); 2716 check_preempt_curr(rq, p);
2036#ifdef CONFIG_SMP 2717#ifdef CONFIG_SMP
@@ -2674,7 +3355,7 @@ static int move_one_task(struct rq *this_rq, int this_cpu, struct rq *busiest,
2674static struct sched_group * 3355static struct sched_group *
2675find_busiest_group(struct sched_domain *sd, int this_cpu, 3356find_busiest_group(struct sched_domain *sd, int this_cpu,
2676 unsigned long *imbalance, enum cpu_idle_type idle, 3357 unsigned long *imbalance, enum cpu_idle_type idle,
2677 int *sd_idle, cpumask_t *cpus, int *balance) 3358 int *sd_idle, const cpumask_t *cpus, int *balance)
2678{ 3359{
2679 struct sched_group *busiest = NULL, *this = NULL, *group = sd->groups; 3360 struct sched_group *busiest = NULL, *this = NULL, *group = sd->groups;
2680 unsigned long max_load, avg_load, total_load, this_load, total_pwr; 3361 unsigned long max_load, avg_load, total_load, this_load, total_pwr;
@@ -2975,7 +3656,7 @@ ret:
2975 */ 3656 */
2976static struct rq * 3657static struct rq *
2977find_busiest_queue(struct sched_group *group, enum cpu_idle_type idle, 3658find_busiest_queue(struct sched_group *group, enum cpu_idle_type idle,
2978 unsigned long imbalance, cpumask_t *cpus) 3659 unsigned long imbalance, const cpumask_t *cpus)
2979{ 3660{
2980 struct rq *busiest = NULL, *rq; 3661 struct rq *busiest = NULL, *rq;
2981 unsigned long max_load = 0; 3662 unsigned long max_load = 0;
@@ -3014,14 +3695,18 @@ find_busiest_queue(struct sched_group *group, enum cpu_idle_type idle,
3014 */ 3695 */
3015static int load_balance(int this_cpu, struct rq *this_rq, 3696static int load_balance(int this_cpu, struct rq *this_rq,
3016 struct sched_domain *sd, enum cpu_idle_type idle, 3697 struct sched_domain *sd, enum cpu_idle_type idle,
3017 int *balance) 3698 int *balance, cpumask_t *cpus)
3018{ 3699{
3019 int ld_moved, all_pinned = 0, active_balance = 0, sd_idle = 0; 3700 int ld_moved, all_pinned = 0, active_balance = 0, sd_idle = 0;
3020 struct sched_group *group; 3701 struct sched_group *group;
3021 unsigned long imbalance; 3702 unsigned long imbalance;
3022 struct rq *busiest; 3703 struct rq *busiest;
3023 cpumask_t cpus = CPU_MASK_ALL;
3024 unsigned long flags; 3704 unsigned long flags;
3705 int unlock_aggregate;
3706
3707 cpus_setall(*cpus);
3708
3709 unlock_aggregate = get_aggregate(sd);
3025 3710
3026 /* 3711 /*
3027 * When power savings policy is enabled for the parent domain, idle 3712 * When power savings policy is enabled for the parent domain, idle
@@ -3037,7 +3722,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
3037 3722
3038redo: 3723redo:
3039 group = find_busiest_group(sd, this_cpu, &imbalance, idle, &sd_idle, 3724 group = find_busiest_group(sd, this_cpu, &imbalance, idle, &sd_idle,
3040 &cpus, balance); 3725 cpus, balance);
3041 3726
3042 if (*balance == 0) 3727 if (*balance == 0)
3043 goto out_balanced; 3728 goto out_balanced;
@@ -3047,7 +3732,7 @@ redo:
3047 goto out_balanced; 3732 goto out_balanced;
3048 } 3733 }
3049 3734
3050 busiest = find_busiest_queue(group, idle, imbalance, &cpus); 3735 busiest = find_busiest_queue(group, idle, imbalance, cpus);
3051 if (!busiest) { 3736 if (!busiest) {
3052 schedstat_inc(sd, lb_nobusyq[idle]); 3737 schedstat_inc(sd, lb_nobusyq[idle]);
3053 goto out_balanced; 3738 goto out_balanced;
@@ -3080,8 +3765,8 @@ redo:
3080 3765
3081 /* All tasks on this runqueue were pinned by CPU affinity */ 3766 /* All tasks on this runqueue were pinned by CPU affinity */
3082 if (unlikely(all_pinned)) { 3767 if (unlikely(all_pinned)) {
3083 cpu_clear(cpu_of(busiest), cpus); 3768 cpu_clear(cpu_of(busiest), *cpus);
3084 if (!cpus_empty(cpus)) 3769 if (!cpus_empty(*cpus))
3085 goto redo; 3770 goto redo;
3086 goto out_balanced; 3771 goto out_balanced;
3087 } 3772 }
@@ -3138,8 +3823,9 @@ redo:
3138 3823
3139 if (!ld_moved && !sd_idle && sd->flags & SD_SHARE_CPUPOWER && 3824 if (!ld_moved && !sd_idle && sd->flags & SD_SHARE_CPUPOWER &&
3140 !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE)) 3825 !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
3141 return -1; 3826 ld_moved = -1;
3142 return ld_moved; 3827
3828 goto out;
3143 3829
3144out_balanced: 3830out_balanced:
3145 schedstat_inc(sd, lb_balanced[idle]); 3831 schedstat_inc(sd, lb_balanced[idle]);
@@ -3154,8 +3840,13 @@ out_one_pinned:
3154 3840
3155 if (!sd_idle && sd->flags & SD_SHARE_CPUPOWER && 3841 if (!sd_idle && sd->flags & SD_SHARE_CPUPOWER &&
3156 !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE)) 3842 !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
3157 return -1; 3843 ld_moved = -1;
3158 return 0; 3844 else
3845 ld_moved = 0;
3846out:
3847 if (unlock_aggregate)
3848 put_aggregate(sd);
3849 return ld_moved;
3159} 3850}
3160 3851
3161/* 3852/*
@@ -3166,7 +3857,8 @@ out_one_pinned:
3166 * this_rq is locked. 3857 * this_rq is locked.
3167 */ 3858 */
3168static int 3859static int
3169load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd) 3860load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd,
3861 cpumask_t *cpus)
3170{ 3862{
3171 struct sched_group *group; 3863 struct sched_group *group;
3172 struct rq *busiest = NULL; 3864 struct rq *busiest = NULL;
@@ -3174,7 +3866,8 @@ load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd)
3174 int ld_moved = 0; 3866 int ld_moved = 0;
3175 int sd_idle = 0; 3867 int sd_idle = 0;
3176 int all_pinned = 0; 3868 int all_pinned = 0;
3177 cpumask_t cpus = CPU_MASK_ALL; 3869
3870 cpus_setall(*cpus);
3178 3871
3179 /* 3872 /*
3180 * When power savings policy is enabled for the parent domain, idle 3873 * When power savings policy is enabled for the parent domain, idle
@@ -3189,14 +3882,13 @@ load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd)
3189 schedstat_inc(sd, lb_count[CPU_NEWLY_IDLE]); 3882 schedstat_inc(sd, lb_count[CPU_NEWLY_IDLE]);
3190redo: 3883redo:
3191 group = find_busiest_group(sd, this_cpu, &imbalance, CPU_NEWLY_IDLE, 3884 group = find_busiest_group(sd, this_cpu, &imbalance, CPU_NEWLY_IDLE,
3192 &sd_idle, &cpus, NULL); 3885 &sd_idle, cpus, NULL);
3193 if (!group) { 3886 if (!group) {
3194 schedstat_inc(sd, lb_nobusyg[CPU_NEWLY_IDLE]); 3887 schedstat_inc(sd, lb_nobusyg[CPU_NEWLY_IDLE]);
3195 goto out_balanced; 3888 goto out_balanced;
3196 } 3889 }
3197 3890
3198 busiest = find_busiest_queue(group, CPU_NEWLY_IDLE, imbalance, 3891 busiest = find_busiest_queue(group, CPU_NEWLY_IDLE, imbalance, cpus);
3199 &cpus);
3200 if (!busiest) { 3892 if (!busiest) {
3201 schedstat_inc(sd, lb_nobusyq[CPU_NEWLY_IDLE]); 3893 schedstat_inc(sd, lb_nobusyq[CPU_NEWLY_IDLE]);
3202 goto out_balanced; 3894 goto out_balanced;
@@ -3218,8 +3910,8 @@ redo:
3218 spin_unlock(&busiest->lock); 3910 spin_unlock(&busiest->lock);
3219 3911
3220 if (unlikely(all_pinned)) { 3912 if (unlikely(all_pinned)) {
3221 cpu_clear(cpu_of(busiest), cpus); 3913 cpu_clear(cpu_of(busiest), *cpus);
3222 if (!cpus_empty(cpus)) 3914 if (!cpus_empty(*cpus))
3223 goto redo; 3915 goto redo;
3224 } 3916 }
3225 } 3917 }
@@ -3253,6 +3945,7 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
3253 struct sched_domain *sd; 3945 struct sched_domain *sd;
3254 int pulled_task = -1; 3946 int pulled_task = -1;
3255 unsigned long next_balance = jiffies + HZ; 3947 unsigned long next_balance = jiffies + HZ;
3948 cpumask_t tmpmask;
3256 3949
3257 for_each_domain(this_cpu, sd) { 3950 for_each_domain(this_cpu, sd) {
3258 unsigned long interval; 3951 unsigned long interval;
@@ -3262,8 +3955,8 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
3262 3955
3263 if (sd->flags & SD_BALANCE_NEWIDLE) 3956 if (sd->flags & SD_BALANCE_NEWIDLE)
3264 /* If we've pulled tasks over stop searching: */ 3957 /* If we've pulled tasks over stop searching: */
3265 pulled_task = load_balance_newidle(this_cpu, 3958 pulled_task = load_balance_newidle(this_cpu, this_rq,
3266 this_rq, sd); 3959 sd, &tmpmask);
3267 3960
3268 interval = msecs_to_jiffies(sd->balance_interval); 3961 interval = msecs_to_jiffies(sd->balance_interval);
3269 if (time_after(next_balance, sd->last_balance + interval)) 3962 if (time_after(next_balance, sd->last_balance + interval))
@@ -3422,6 +4115,7 @@ static void rebalance_domains(int cpu, enum cpu_idle_type idle)
3422 /* Earliest time when we have to do rebalance again */ 4115 /* Earliest time when we have to do rebalance again */
3423 unsigned long next_balance = jiffies + 60*HZ; 4116 unsigned long next_balance = jiffies + 60*HZ;
3424 int update_next_balance = 0; 4117 int update_next_balance = 0;
4118 cpumask_t tmp;
3425 4119
3426 for_each_domain(cpu, sd) { 4120 for_each_domain(cpu, sd) {
3427 if (!(sd->flags & SD_LOAD_BALANCE)) 4121 if (!(sd->flags & SD_LOAD_BALANCE))
@@ -3445,7 +4139,7 @@ static void rebalance_domains(int cpu, enum cpu_idle_type idle)
3445 } 4139 }
3446 4140
3447 if (time_after_eq(jiffies, sd->last_balance + interval)) { 4141 if (time_after_eq(jiffies, sd->last_balance + interval)) {
3448 if (load_balance(cpu, rq, sd, idle, &balance)) { 4142 if (load_balance(cpu, rq, sd, idle, &balance, &tmp)) {
3449 /* 4143 /*
3450 * We've pulled tasks over so either we're no 4144 * We've pulled tasks over so either we're no
3451 * longer idle, or one of our SMT siblings is 4145 * longer idle, or one of our SMT siblings is
@@ -3561,7 +4255,7 @@ static inline void trigger_load_balance(struct rq *rq, int cpu)
3561 */ 4255 */
3562 int ilb = first_cpu(nohz.cpu_mask); 4256 int ilb = first_cpu(nohz.cpu_mask);
3563 4257
3564 if (ilb != NR_CPUS) 4258 if (ilb < nr_cpu_ids)
3565 resched_cpu(ilb); 4259 resched_cpu(ilb);
3566 } 4260 }
3567 } 4261 }
@@ -3765,9 +4459,9 @@ void scheduler_tick(void)
3765 rq->clock_underflows++; 4459 rq->clock_underflows++;
3766 } 4460 }
3767 rq->tick_timestamp = rq->clock; 4461 rq->tick_timestamp = rq->clock;
4462 update_last_tick_seen(rq);
3768 update_cpu_load(rq); 4463 update_cpu_load(rq);
3769 curr->sched_class->task_tick(rq, curr, 0); 4464 curr->sched_class->task_tick(rq, curr, 0);
3770 update_sched_rt_period(rq);
3771 spin_unlock(&rq->lock); 4465 spin_unlock(&rq->lock);
3772 4466
3773#ifdef CONFIG_SMP 4467#ifdef CONFIG_SMP
@@ -4367,10 +5061,8 @@ void set_user_nice(struct task_struct *p, long nice)
4367 goto out_unlock; 5061 goto out_unlock;
4368 } 5062 }
4369 on_rq = p->se.on_rq; 5063 on_rq = p->se.on_rq;
4370 if (on_rq) { 5064 if (on_rq)
4371 dequeue_task(rq, p, 0); 5065 dequeue_task(rq, p, 0);
4372 dec_load(rq, p);
4373 }
4374 5066
4375 p->static_prio = NICE_TO_PRIO(nice); 5067 p->static_prio = NICE_TO_PRIO(nice);
4376 set_load_weight(p); 5068 set_load_weight(p);
@@ -4380,7 +5072,6 @@ void set_user_nice(struct task_struct *p, long nice)
4380 5072
4381 if (on_rq) { 5073 if (on_rq) {
4382 enqueue_task(rq, p, 0); 5074 enqueue_task(rq, p, 0);
4383 inc_load(rq, p);
4384 /* 5075 /*
4385 * If the task increased its priority or is running and 5076 * If the task increased its priority or is running and
4386 * lowered its priority, then reschedule its CPU: 5077 * lowered its priority, then reschedule its CPU:
@@ -4602,7 +5293,7 @@ recheck:
4602 * Do not allow realtime tasks into groups that have no runtime 5293 * Do not allow realtime tasks into groups that have no runtime
4603 * assigned. 5294 * assigned.
4604 */ 5295 */
4605 if (rt_policy(policy) && task_group(p)->rt_runtime == 0) 5296 if (rt_policy(policy) && task_group(p)->rt_bandwidth.rt_runtime == 0)
4606 return -EPERM; 5297 return -EPERM;
4607#endif 5298#endif
4608 5299
@@ -4764,9 +5455,10 @@ out_unlock:
4764 return retval; 5455 return retval;
4765} 5456}
4766 5457
4767long sched_setaffinity(pid_t pid, cpumask_t new_mask) 5458long sched_setaffinity(pid_t pid, const cpumask_t *in_mask)
4768{ 5459{
4769 cpumask_t cpus_allowed; 5460 cpumask_t cpus_allowed;
5461 cpumask_t new_mask = *in_mask;
4770 struct task_struct *p; 5462 struct task_struct *p;
4771 int retval; 5463 int retval;
4772 5464
@@ -4797,13 +5489,13 @@ long sched_setaffinity(pid_t pid, cpumask_t new_mask)
4797 if (retval) 5489 if (retval)
4798 goto out_unlock; 5490 goto out_unlock;
4799 5491
4800 cpus_allowed = cpuset_cpus_allowed(p); 5492 cpuset_cpus_allowed(p, &cpus_allowed);
4801 cpus_and(new_mask, new_mask, cpus_allowed); 5493 cpus_and(new_mask, new_mask, cpus_allowed);
4802 again: 5494 again:
4803 retval = set_cpus_allowed(p, new_mask); 5495 retval = set_cpus_allowed_ptr(p, &new_mask);
4804 5496
4805 if (!retval) { 5497 if (!retval) {
4806 cpus_allowed = cpuset_cpus_allowed(p); 5498 cpuset_cpus_allowed(p, &cpus_allowed);
4807 if (!cpus_subset(new_mask, cpus_allowed)) { 5499 if (!cpus_subset(new_mask, cpus_allowed)) {
4808 /* 5500 /*
4809 * We must have raced with a concurrent cpuset 5501 * We must have raced with a concurrent cpuset
@@ -4847,7 +5539,7 @@ asmlinkage long sys_sched_setaffinity(pid_t pid, unsigned int len,
4847 if (retval) 5539 if (retval)
4848 return retval; 5540 return retval;
4849 5541
4850 return sched_setaffinity(pid, new_mask); 5542 return sched_setaffinity(pid, &new_mask);
4851} 5543}
4852 5544
4853/* 5545/*
@@ -5309,7 +6001,6 @@ static inline void sched_init_granularity(void)
5309 sysctl_sched_latency = limit; 6001 sysctl_sched_latency = limit;
5310 6002
5311 sysctl_sched_wakeup_granularity *= factor; 6003 sysctl_sched_wakeup_granularity *= factor;
5312 sysctl_sched_batch_wakeup_granularity *= factor;
5313} 6004}
5314 6005
5315#ifdef CONFIG_SMP 6006#ifdef CONFIG_SMP
@@ -5338,7 +6029,7 @@ static inline void sched_init_granularity(void)
5338 * task must not exit() & deallocate itself prematurely. The 6029 * task must not exit() & deallocate itself prematurely. The
5339 * call is not atomic; no spinlocks may be held. 6030 * call is not atomic; no spinlocks may be held.
5340 */ 6031 */
5341int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 6032int set_cpus_allowed_ptr(struct task_struct *p, const cpumask_t *new_mask)
5342{ 6033{
5343 struct migration_req req; 6034 struct migration_req req;
5344 unsigned long flags; 6035 unsigned long flags;
@@ -5346,23 +6037,23 @@ int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
5346 int ret = 0; 6037 int ret = 0;
5347 6038
5348 rq = task_rq_lock(p, &flags); 6039 rq = task_rq_lock(p, &flags);
5349 if (!cpus_intersects(new_mask, cpu_online_map)) { 6040 if (!cpus_intersects(*new_mask, cpu_online_map)) {
5350 ret = -EINVAL; 6041 ret = -EINVAL;
5351 goto out; 6042 goto out;
5352 } 6043 }
5353 6044
5354 if (p->sched_class->set_cpus_allowed) 6045 if (p->sched_class->set_cpus_allowed)
5355 p->sched_class->set_cpus_allowed(p, &new_mask); 6046 p->sched_class->set_cpus_allowed(p, new_mask);
5356 else { 6047 else {
5357 p->cpus_allowed = new_mask; 6048 p->cpus_allowed = *new_mask;
5358 p->rt.nr_cpus_allowed = cpus_weight(new_mask); 6049 p->rt.nr_cpus_allowed = cpus_weight(*new_mask);
5359 } 6050 }
5360 6051
5361 /* Can the task run on the task's current CPU? If so, we're done */ 6052 /* Can the task run on the task's current CPU? If so, we're done */
5362 if (cpu_isset(task_cpu(p), new_mask)) 6053 if (cpu_isset(task_cpu(p), *new_mask))
5363 goto out; 6054 goto out;
5364 6055
5365 if (migrate_task(p, any_online_cpu(new_mask), &req)) { 6056 if (migrate_task(p, any_online_cpu(*new_mask), &req)) {
5366 /* Need help from migration thread: drop lock and wait. */ 6057 /* Need help from migration thread: drop lock and wait. */
5367 task_rq_unlock(rq, &flags); 6058 task_rq_unlock(rq, &flags);
5368 wake_up_process(rq->migration_thread); 6059 wake_up_process(rq->migration_thread);
@@ -5375,7 +6066,7 @@ out:
5375 6066
5376 return ret; 6067 return ret;
5377} 6068}
5378EXPORT_SYMBOL_GPL(set_cpus_allowed); 6069EXPORT_SYMBOL_GPL(set_cpus_allowed_ptr);
5379 6070
5380/* 6071/*
5381 * Move (not current) task off this cpu, onto dest cpu. We're doing 6072 * Move (not current) task off this cpu, onto dest cpu. We're doing
@@ -5513,12 +6204,14 @@ static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p)
5513 dest_cpu = any_online_cpu(mask); 6204 dest_cpu = any_online_cpu(mask);
5514 6205
5515 /* On any allowed CPU? */ 6206 /* On any allowed CPU? */
5516 if (dest_cpu == NR_CPUS) 6207 if (dest_cpu >= nr_cpu_ids)
5517 dest_cpu = any_online_cpu(p->cpus_allowed); 6208 dest_cpu = any_online_cpu(p->cpus_allowed);
5518 6209
5519 /* No more Mr. Nice Guy. */ 6210 /* No more Mr. Nice Guy. */
5520 if (dest_cpu == NR_CPUS) { 6211 if (dest_cpu >= nr_cpu_ids) {
5521 cpumask_t cpus_allowed = cpuset_cpus_allowed_locked(p); 6212 cpumask_t cpus_allowed;
6213
6214 cpuset_cpus_allowed_locked(p, &cpus_allowed);
5522 /* 6215 /*
5523 * Try to stay on the same cpuset, where the 6216 * Try to stay on the same cpuset, where the
5524 * current cpuset may be a subset of all cpus. 6217 * current cpuset may be a subset of all cpus.
@@ -5554,7 +6247,7 @@ static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p)
5554 */ 6247 */
5555static void migrate_nr_uninterruptible(struct rq *rq_src) 6248static void migrate_nr_uninterruptible(struct rq *rq_src)
5556{ 6249{
5557 struct rq *rq_dest = cpu_rq(any_online_cpu(CPU_MASK_ALL)); 6250 struct rq *rq_dest = cpu_rq(any_online_cpu(*CPU_MASK_ALL_PTR));
5558 unsigned long flags; 6251 unsigned long flags;
5559 6252
5560 local_irq_save(flags); 6253 local_irq_save(flags);
@@ -5966,20 +6659,16 @@ void __init migration_init(void)
5966 6659
5967#ifdef CONFIG_SMP 6660#ifdef CONFIG_SMP
5968 6661
5969/* Number of possible processor ids */
5970int nr_cpu_ids __read_mostly = NR_CPUS;
5971EXPORT_SYMBOL(nr_cpu_ids);
5972
5973#ifdef CONFIG_SCHED_DEBUG 6662#ifdef CONFIG_SCHED_DEBUG
5974 6663
5975static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level) 6664static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
6665 cpumask_t *groupmask)
5976{ 6666{
5977 struct sched_group *group = sd->groups; 6667 struct sched_group *group = sd->groups;
5978 cpumask_t groupmask; 6668 char str[256];
5979 char str[NR_CPUS];
5980 6669
5981 cpumask_scnprintf(str, NR_CPUS, sd->span); 6670 cpulist_scnprintf(str, sizeof(str), sd->span);
5982 cpus_clear(groupmask); 6671 cpus_clear(*groupmask);
5983 6672
5984 printk(KERN_DEBUG "%*s domain %d: ", level, "", level); 6673 printk(KERN_DEBUG "%*s domain %d: ", level, "", level);
5985 6674
@@ -6023,25 +6712,25 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level)
6023 break; 6712 break;
6024 } 6713 }
6025 6714
6026 if (cpus_intersects(groupmask, group->cpumask)) { 6715 if (cpus_intersects(*groupmask, group->cpumask)) {
6027 printk(KERN_CONT "\n"); 6716 printk(KERN_CONT "\n");
6028 printk(KERN_ERR "ERROR: repeated CPUs\n"); 6717 printk(KERN_ERR "ERROR: repeated CPUs\n");
6029 break; 6718 break;
6030 } 6719 }
6031 6720
6032 cpus_or(groupmask, groupmask, group->cpumask); 6721 cpus_or(*groupmask, *groupmask, group->cpumask);
6033 6722
6034 cpumask_scnprintf(str, NR_CPUS, group->cpumask); 6723 cpulist_scnprintf(str, sizeof(str), group->cpumask);
6035 printk(KERN_CONT " %s", str); 6724 printk(KERN_CONT " %s", str);
6036 6725
6037 group = group->next; 6726 group = group->next;
6038 } while (group != sd->groups); 6727 } while (group != sd->groups);
6039 printk(KERN_CONT "\n"); 6728 printk(KERN_CONT "\n");
6040 6729
6041 if (!cpus_equal(sd->span, groupmask)) 6730 if (!cpus_equal(sd->span, *groupmask))
6042 printk(KERN_ERR "ERROR: groups don't span domain->span\n"); 6731 printk(KERN_ERR "ERROR: groups don't span domain->span\n");
6043 6732
6044 if (sd->parent && !cpus_subset(groupmask, sd->parent->span)) 6733 if (sd->parent && !cpus_subset(*groupmask, sd->parent->span))
6045 printk(KERN_ERR "ERROR: parent span is not a superset " 6734 printk(KERN_ERR "ERROR: parent span is not a superset "
6046 "of domain->span\n"); 6735 "of domain->span\n");
6047 return 0; 6736 return 0;
@@ -6049,6 +6738,7 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level)
6049 6738
6050static void sched_domain_debug(struct sched_domain *sd, int cpu) 6739static void sched_domain_debug(struct sched_domain *sd, int cpu)
6051{ 6740{
6741 cpumask_t *groupmask;
6052 int level = 0; 6742 int level = 0;
6053 6743
6054 if (!sd) { 6744 if (!sd) {
@@ -6058,14 +6748,21 @@ static void sched_domain_debug(struct sched_domain *sd, int cpu)
6058 6748
6059 printk(KERN_DEBUG "CPU%d attaching sched-domain:\n", cpu); 6749 printk(KERN_DEBUG "CPU%d attaching sched-domain:\n", cpu);
6060 6750
6751 groupmask = kmalloc(sizeof(cpumask_t), GFP_KERNEL);
6752 if (!groupmask) {
6753 printk(KERN_DEBUG "Cannot load-balance (out of memory)\n");
6754 return;
6755 }
6756
6061 for (;;) { 6757 for (;;) {
6062 if (sched_domain_debug_one(sd, cpu, level)) 6758 if (sched_domain_debug_one(sd, cpu, level, groupmask))
6063 break; 6759 break;
6064 level++; 6760 level++;
6065 sd = sd->parent; 6761 sd = sd->parent;
6066 if (!sd) 6762 if (!sd)
6067 break; 6763 break;
6068 } 6764 }
6765 kfree(groupmask);
6069} 6766}
6070#else 6767#else
6071# define sched_domain_debug(sd, cpu) do { } while (0) 6768# define sched_domain_debug(sd, cpu) do { } while (0)
@@ -6253,30 +6950,33 @@ __setup("isolcpus=", isolated_cpu_setup);
6253 * and ->cpu_power to 0. 6950 * and ->cpu_power to 0.
6254 */ 6951 */
6255static void 6952static void
6256init_sched_build_groups(cpumask_t span, const cpumask_t *cpu_map, 6953init_sched_build_groups(const cpumask_t *span, const cpumask_t *cpu_map,
6257 int (*group_fn)(int cpu, const cpumask_t *cpu_map, 6954 int (*group_fn)(int cpu, const cpumask_t *cpu_map,
6258 struct sched_group **sg)) 6955 struct sched_group **sg,
6956 cpumask_t *tmpmask),
6957 cpumask_t *covered, cpumask_t *tmpmask)
6259{ 6958{
6260 struct sched_group *first = NULL, *last = NULL; 6959 struct sched_group *first = NULL, *last = NULL;
6261 cpumask_t covered = CPU_MASK_NONE;
6262 int i; 6960 int i;
6263 6961
6264 for_each_cpu_mask(i, span) { 6962 cpus_clear(*covered);
6963
6964 for_each_cpu_mask(i, *span) {
6265 struct sched_group *sg; 6965 struct sched_group *sg;
6266 int group = group_fn(i, cpu_map, &sg); 6966 int group = group_fn(i, cpu_map, &sg, tmpmask);
6267 int j; 6967 int j;
6268 6968
6269 if (cpu_isset(i, covered)) 6969 if (cpu_isset(i, *covered))
6270 continue; 6970 continue;
6271 6971
6272 sg->cpumask = CPU_MASK_NONE; 6972 cpus_clear(sg->cpumask);
6273 sg->__cpu_power = 0; 6973 sg->__cpu_power = 0;
6274 6974
6275 for_each_cpu_mask(j, span) { 6975 for_each_cpu_mask(j, *span) {
6276 if (group_fn(j, cpu_map, NULL) != group) 6976 if (group_fn(j, cpu_map, NULL, tmpmask) != group)
6277 continue; 6977 continue;
6278 6978
6279 cpu_set(j, covered); 6979 cpu_set(j, *covered);
6280 cpu_set(j, sg->cpumask); 6980 cpu_set(j, sg->cpumask);
6281 } 6981 }
6282 if (!first) 6982 if (!first)
@@ -6302,7 +7002,7 @@ init_sched_build_groups(cpumask_t span, const cpumask_t *cpu_map,
6302 * 7002 *
6303 * Should use nodemask_t. 7003 * Should use nodemask_t.
6304 */ 7004 */
6305static int find_next_best_node(int node, unsigned long *used_nodes) 7005static int find_next_best_node(int node, nodemask_t *used_nodes)
6306{ 7006{
6307 int i, n, val, min_val, best_node = 0; 7007 int i, n, val, min_val, best_node = 0;
6308 7008
@@ -6316,7 +7016,7 @@ static int find_next_best_node(int node, unsigned long *used_nodes)
6316 continue; 7016 continue;
6317 7017
6318 /* Skip already used nodes */ 7018 /* Skip already used nodes */
6319 if (test_bit(n, used_nodes)) 7019 if (node_isset(n, *used_nodes))
6320 continue; 7020 continue;
6321 7021
6322 /* Simple min distance search */ 7022 /* Simple min distance search */
@@ -6328,40 +7028,36 @@ static int find_next_best_node(int node, unsigned long *used_nodes)
6328 } 7028 }
6329 } 7029 }
6330 7030
6331 set_bit(best_node, used_nodes); 7031 node_set(best_node, *used_nodes);
6332 return best_node; 7032 return best_node;
6333} 7033}
6334 7034
6335/** 7035/**
6336 * sched_domain_node_span - get a cpumask for a node's sched_domain 7036 * sched_domain_node_span - get a cpumask for a node's sched_domain
6337 * @node: node whose cpumask we're constructing 7037 * @node: node whose cpumask we're constructing
6338 * @size: number of nodes to include in this span
6339 * 7038 *
6340 * Given a node, construct a good cpumask for its sched_domain to span. It 7039 * Given a node, construct a good cpumask for its sched_domain to span. It
6341 * should be one that prevents unnecessary balancing, but also spreads tasks 7040 * should be one that prevents unnecessary balancing, but also spreads tasks
6342 * out optimally. 7041 * out optimally.
6343 */ 7042 */
6344static cpumask_t sched_domain_node_span(int node) 7043static void sched_domain_node_span(int node, cpumask_t *span)
6345{ 7044{
6346 DECLARE_BITMAP(used_nodes, MAX_NUMNODES); 7045 nodemask_t used_nodes;
6347 cpumask_t span, nodemask; 7046 node_to_cpumask_ptr(nodemask, node);
6348 int i; 7047 int i;
6349 7048
6350 cpus_clear(span); 7049 cpus_clear(*span);
6351 bitmap_zero(used_nodes, MAX_NUMNODES); 7050 nodes_clear(used_nodes);
6352 7051
6353 nodemask = node_to_cpumask(node); 7052 cpus_or(*span, *span, *nodemask);
6354 cpus_or(span, span, nodemask); 7053 node_set(node, used_nodes);
6355 set_bit(node, used_nodes);
6356 7054
6357 for (i = 1; i < SD_NODES_PER_DOMAIN; i++) { 7055 for (i = 1; i < SD_NODES_PER_DOMAIN; i++) {
6358 int next_node = find_next_best_node(node, used_nodes); 7056 int next_node = find_next_best_node(node, &used_nodes);
6359 7057
6360 nodemask = node_to_cpumask(next_node); 7058 node_to_cpumask_ptr_next(nodemask, next_node);
6361 cpus_or(span, span, nodemask); 7059 cpus_or(*span, *span, *nodemask);
6362 } 7060 }
6363
6364 return span;
6365} 7061}
6366#endif 7062#endif
6367 7063
@@ -6375,7 +7071,8 @@ static DEFINE_PER_CPU(struct sched_domain, cpu_domains);
6375static DEFINE_PER_CPU(struct sched_group, sched_group_cpus); 7071static DEFINE_PER_CPU(struct sched_group, sched_group_cpus);
6376 7072
6377static int 7073static int
6378cpu_to_cpu_group(int cpu, const cpumask_t *cpu_map, struct sched_group **sg) 7074cpu_to_cpu_group(int cpu, const cpumask_t *cpu_map, struct sched_group **sg,
7075 cpumask_t *unused)
6379{ 7076{
6380 if (sg) 7077 if (sg)
6381 *sg = &per_cpu(sched_group_cpus, cpu); 7078 *sg = &per_cpu(sched_group_cpus, cpu);
@@ -6393,19 +7090,22 @@ static DEFINE_PER_CPU(struct sched_group, sched_group_core);
6393 7090
6394#if defined(CONFIG_SCHED_MC) && defined(CONFIG_SCHED_SMT) 7091#if defined(CONFIG_SCHED_MC) && defined(CONFIG_SCHED_SMT)
6395static int 7092static int
6396cpu_to_core_group(int cpu, const cpumask_t *cpu_map, struct sched_group **sg) 7093cpu_to_core_group(int cpu, const cpumask_t *cpu_map, struct sched_group **sg,
7094 cpumask_t *mask)
6397{ 7095{
6398 int group; 7096 int group;
6399 cpumask_t mask = per_cpu(cpu_sibling_map, cpu); 7097
6400 cpus_and(mask, mask, *cpu_map); 7098 *mask = per_cpu(cpu_sibling_map, cpu);
6401 group = first_cpu(mask); 7099 cpus_and(*mask, *mask, *cpu_map);
7100 group = first_cpu(*mask);
6402 if (sg) 7101 if (sg)
6403 *sg = &per_cpu(sched_group_core, group); 7102 *sg = &per_cpu(sched_group_core, group);
6404 return group; 7103 return group;
6405} 7104}
6406#elif defined(CONFIG_SCHED_MC) 7105#elif defined(CONFIG_SCHED_MC)
6407static int 7106static int
6408cpu_to_core_group(int cpu, const cpumask_t *cpu_map, struct sched_group **sg) 7107cpu_to_core_group(int cpu, const cpumask_t *cpu_map, struct sched_group **sg,
7108 cpumask_t *unused)
6409{ 7109{
6410 if (sg) 7110 if (sg)
6411 *sg = &per_cpu(sched_group_core, cpu); 7111 *sg = &per_cpu(sched_group_core, cpu);
@@ -6417,17 +7117,18 @@ static DEFINE_PER_CPU(struct sched_domain, phys_domains);
6417static DEFINE_PER_CPU(struct sched_group, sched_group_phys); 7117static DEFINE_PER_CPU(struct sched_group, sched_group_phys);
6418 7118
6419static int 7119static int
6420cpu_to_phys_group(int cpu, const cpumask_t *cpu_map, struct sched_group **sg) 7120cpu_to_phys_group(int cpu, const cpumask_t *cpu_map, struct sched_group **sg,
7121 cpumask_t *mask)
6421{ 7122{
6422 int group; 7123 int group;
6423#ifdef CONFIG_SCHED_MC 7124#ifdef CONFIG_SCHED_MC
6424 cpumask_t mask = cpu_coregroup_map(cpu); 7125 *mask = cpu_coregroup_map(cpu);
6425 cpus_and(mask, mask, *cpu_map); 7126 cpus_and(*mask, *mask, *cpu_map);
6426 group = first_cpu(mask); 7127 group = first_cpu(*mask);
6427#elif defined(CONFIG_SCHED_SMT) 7128#elif defined(CONFIG_SCHED_SMT)
6428 cpumask_t mask = per_cpu(cpu_sibling_map, cpu); 7129 *mask = per_cpu(cpu_sibling_map, cpu);
6429 cpus_and(mask, mask, *cpu_map); 7130 cpus_and(*mask, *mask, *cpu_map);
6430 group = first_cpu(mask); 7131 group = first_cpu(*mask);
6431#else 7132#else
6432 group = cpu; 7133 group = cpu;
6433#endif 7134#endif
@@ -6443,19 +7144,19 @@ cpu_to_phys_group(int cpu, const cpumask_t *cpu_map, struct sched_group **sg)
6443 * gets dynamically allocated. 7144 * gets dynamically allocated.
6444 */ 7145 */
6445static DEFINE_PER_CPU(struct sched_domain, node_domains); 7146static DEFINE_PER_CPU(struct sched_domain, node_domains);
6446static struct sched_group **sched_group_nodes_bycpu[NR_CPUS]; 7147static struct sched_group ***sched_group_nodes_bycpu;
6447 7148
6448static DEFINE_PER_CPU(struct sched_domain, allnodes_domains); 7149static DEFINE_PER_CPU(struct sched_domain, allnodes_domains);
6449static DEFINE_PER_CPU(struct sched_group, sched_group_allnodes); 7150static DEFINE_PER_CPU(struct sched_group, sched_group_allnodes);
6450 7151
6451static int cpu_to_allnodes_group(int cpu, const cpumask_t *cpu_map, 7152static int cpu_to_allnodes_group(int cpu, const cpumask_t *cpu_map,
6452 struct sched_group **sg) 7153 struct sched_group **sg, cpumask_t *nodemask)
6453{ 7154{
6454 cpumask_t nodemask = node_to_cpumask(cpu_to_node(cpu));
6455 int group; 7155 int group;
6456 7156
6457 cpus_and(nodemask, nodemask, *cpu_map); 7157 *nodemask = node_to_cpumask(cpu_to_node(cpu));
6458 group = first_cpu(nodemask); 7158 cpus_and(*nodemask, *nodemask, *cpu_map);
7159 group = first_cpu(*nodemask);
6459 7160
6460 if (sg) 7161 if (sg)
6461 *sg = &per_cpu(sched_group_allnodes, group); 7162 *sg = &per_cpu(sched_group_allnodes, group);
@@ -6491,7 +7192,7 @@ static void init_numa_sched_groups_power(struct sched_group *group_head)
6491 7192
6492#ifdef CONFIG_NUMA 7193#ifdef CONFIG_NUMA
6493/* Free memory allocated for various sched_group structures */ 7194/* Free memory allocated for various sched_group structures */
6494static void free_sched_groups(const cpumask_t *cpu_map) 7195static void free_sched_groups(const cpumask_t *cpu_map, cpumask_t *nodemask)
6495{ 7196{
6496 int cpu, i; 7197 int cpu, i;
6497 7198
@@ -6503,11 +7204,11 @@ static void free_sched_groups(const cpumask_t *cpu_map)
6503 continue; 7204 continue;
6504 7205
6505 for (i = 0; i < MAX_NUMNODES; i++) { 7206 for (i = 0; i < MAX_NUMNODES; i++) {
6506 cpumask_t nodemask = node_to_cpumask(i);
6507 struct sched_group *oldsg, *sg = sched_group_nodes[i]; 7207 struct sched_group *oldsg, *sg = sched_group_nodes[i];
6508 7208
6509 cpus_and(nodemask, nodemask, *cpu_map); 7209 *nodemask = node_to_cpumask(i);
6510 if (cpus_empty(nodemask)) 7210 cpus_and(*nodemask, *nodemask, *cpu_map);
7211 if (cpus_empty(*nodemask))
6511 continue; 7212 continue;
6512 7213
6513 if (sg == NULL) 7214 if (sg == NULL)
@@ -6525,7 +7226,7 @@ next_sg:
6525 } 7226 }
6526} 7227}
6527#else 7228#else
6528static void free_sched_groups(const cpumask_t *cpu_map) 7229static void free_sched_groups(const cpumask_t *cpu_map, cpumask_t *nodemask)
6529{ 7230{
6530} 7231}
6531#endif 7232#endif
@@ -6583,13 +7284,106 @@ static void init_sched_groups_power(int cpu, struct sched_domain *sd)
6583} 7284}
6584 7285
6585/* 7286/*
7287 * Initializers for schedule domains
7288 * Non-inlined to reduce accumulated stack pressure in build_sched_domains()
7289 */
7290
7291#define SD_INIT(sd, type) sd_init_##type(sd)
7292#define SD_INIT_FUNC(type) \
7293static noinline void sd_init_##type(struct sched_domain *sd) \
7294{ \
7295 memset(sd, 0, sizeof(*sd)); \
7296 *sd = SD_##type##_INIT; \
7297 sd->level = SD_LV_##type; \
7298}
7299
7300SD_INIT_FUNC(CPU)
7301#ifdef CONFIG_NUMA
7302 SD_INIT_FUNC(ALLNODES)
7303 SD_INIT_FUNC(NODE)
7304#endif
7305#ifdef CONFIG_SCHED_SMT
7306 SD_INIT_FUNC(SIBLING)
7307#endif
7308#ifdef CONFIG_SCHED_MC
7309 SD_INIT_FUNC(MC)
7310#endif
7311
7312/*
7313 * To minimize stack usage kmalloc room for cpumasks and share the
7314 * space as the usage in build_sched_domains() dictates. Used only
7315 * if the amount of space is significant.
7316 */
7317struct allmasks {
7318 cpumask_t tmpmask; /* make this one first */
7319 union {
7320 cpumask_t nodemask;
7321 cpumask_t this_sibling_map;
7322 cpumask_t this_core_map;
7323 };
7324 cpumask_t send_covered;
7325
7326#ifdef CONFIG_NUMA
7327 cpumask_t domainspan;
7328 cpumask_t covered;
7329 cpumask_t notcovered;
7330#endif
7331};
7332
7333#if NR_CPUS > 128
7334#define SCHED_CPUMASK_ALLOC 1
7335#define SCHED_CPUMASK_FREE(v) kfree(v)
7336#define SCHED_CPUMASK_DECLARE(v) struct allmasks *v
7337#else
7338#define SCHED_CPUMASK_ALLOC 0
7339#define SCHED_CPUMASK_FREE(v)
7340#define SCHED_CPUMASK_DECLARE(v) struct allmasks _v, *v = &_v
7341#endif
7342
7343#define SCHED_CPUMASK_VAR(v, a) cpumask_t *v = (cpumask_t *) \
7344 ((unsigned long)(a) + offsetof(struct allmasks, v))
7345
7346static int default_relax_domain_level = -1;
7347
7348static int __init setup_relax_domain_level(char *str)
7349{
7350 default_relax_domain_level = simple_strtoul(str, NULL, 0);
7351 return 1;
7352}
7353__setup("relax_domain_level=", setup_relax_domain_level);
7354
7355static void set_domain_attribute(struct sched_domain *sd,
7356 struct sched_domain_attr *attr)
7357{
7358 int request;
7359
7360 if (!attr || attr->relax_domain_level < 0) {
7361 if (default_relax_domain_level < 0)
7362 return;
7363 else
7364 request = default_relax_domain_level;
7365 } else
7366 request = attr->relax_domain_level;
7367 if (request < sd->level) {
7368 /* turn off idle balance on this domain */
7369 sd->flags &= ~(SD_WAKE_IDLE|SD_BALANCE_NEWIDLE);
7370 } else {
7371 /* turn on idle balance on this domain */
7372 sd->flags |= (SD_WAKE_IDLE_FAR|SD_BALANCE_NEWIDLE);
7373 }
7374}
7375
7376/*
6586 * Build sched domains for a given set of cpus and attach the sched domains 7377 * Build sched domains for a given set of cpus and attach the sched domains
6587 * to the individual cpus 7378 * to the individual cpus
6588 */ 7379 */
6589static int build_sched_domains(const cpumask_t *cpu_map) 7380static int __build_sched_domains(const cpumask_t *cpu_map,
7381 struct sched_domain_attr *attr)
6590{ 7382{
6591 int i; 7383 int i;
6592 struct root_domain *rd; 7384 struct root_domain *rd;
7385 SCHED_CPUMASK_DECLARE(allmasks);
7386 cpumask_t *tmpmask;
6593#ifdef CONFIG_NUMA 7387#ifdef CONFIG_NUMA
6594 struct sched_group **sched_group_nodes = NULL; 7388 struct sched_group **sched_group_nodes = NULL;
6595 int sd_allnodes = 0; 7389 int sd_allnodes = 0;
@@ -6603,39 +7397,65 @@ static int build_sched_domains(const cpumask_t *cpu_map)
6603 printk(KERN_WARNING "Can not alloc sched group node list\n"); 7397 printk(KERN_WARNING "Can not alloc sched group node list\n");
6604 return -ENOMEM; 7398 return -ENOMEM;
6605 } 7399 }
6606 sched_group_nodes_bycpu[first_cpu(*cpu_map)] = sched_group_nodes;
6607#endif 7400#endif
6608 7401
6609 rd = alloc_rootdomain(); 7402 rd = alloc_rootdomain();
6610 if (!rd) { 7403 if (!rd) {
6611 printk(KERN_WARNING "Cannot alloc root domain\n"); 7404 printk(KERN_WARNING "Cannot alloc root domain\n");
7405#ifdef CONFIG_NUMA
7406 kfree(sched_group_nodes);
7407#endif
6612 return -ENOMEM; 7408 return -ENOMEM;
6613 } 7409 }
6614 7410
7411#if SCHED_CPUMASK_ALLOC
7412 /* get space for all scratch cpumask variables */
7413 allmasks = kmalloc(sizeof(*allmasks), GFP_KERNEL);
7414 if (!allmasks) {
7415 printk(KERN_WARNING "Cannot alloc cpumask array\n");
7416 kfree(rd);
7417#ifdef CONFIG_NUMA
7418 kfree(sched_group_nodes);
7419#endif
7420 return -ENOMEM;
7421 }
7422#endif
7423 tmpmask = (cpumask_t *)allmasks;
7424
7425
7426#ifdef CONFIG_NUMA
7427 sched_group_nodes_bycpu[first_cpu(*cpu_map)] = sched_group_nodes;
7428#endif
7429
6615 /* 7430 /*
6616 * Set up domains for cpus specified by the cpu_map. 7431 * Set up domains for cpus specified by the cpu_map.
6617 */ 7432 */
6618 for_each_cpu_mask(i, *cpu_map) { 7433 for_each_cpu_mask(i, *cpu_map) {
6619 struct sched_domain *sd = NULL, *p; 7434 struct sched_domain *sd = NULL, *p;
6620 cpumask_t nodemask = node_to_cpumask(cpu_to_node(i)); 7435 SCHED_CPUMASK_VAR(nodemask, allmasks);
6621 7436
6622 cpus_and(nodemask, nodemask, *cpu_map); 7437 *nodemask = node_to_cpumask(cpu_to_node(i));
7438 cpus_and(*nodemask, *nodemask, *cpu_map);
6623 7439
6624#ifdef CONFIG_NUMA 7440#ifdef CONFIG_NUMA
6625 if (cpus_weight(*cpu_map) > 7441 if (cpus_weight(*cpu_map) >
6626 SD_NODES_PER_DOMAIN*cpus_weight(nodemask)) { 7442 SD_NODES_PER_DOMAIN*cpus_weight(*nodemask)) {
6627 sd = &per_cpu(allnodes_domains, i); 7443 sd = &per_cpu(allnodes_domains, i);
6628 *sd = SD_ALLNODES_INIT; 7444 SD_INIT(sd, ALLNODES);
7445 set_domain_attribute(sd, attr);
6629 sd->span = *cpu_map; 7446 sd->span = *cpu_map;
6630 cpu_to_allnodes_group(i, cpu_map, &sd->groups); 7447 sd->first_cpu = first_cpu(sd->span);
7448 cpu_to_allnodes_group(i, cpu_map, &sd->groups, tmpmask);
6631 p = sd; 7449 p = sd;
6632 sd_allnodes = 1; 7450 sd_allnodes = 1;
6633 } else 7451 } else
6634 p = NULL; 7452 p = NULL;
6635 7453
6636 sd = &per_cpu(node_domains, i); 7454 sd = &per_cpu(node_domains, i);
6637 *sd = SD_NODE_INIT; 7455 SD_INIT(sd, NODE);
6638 sd->span = sched_domain_node_span(cpu_to_node(i)); 7456 set_domain_attribute(sd, attr);
7457 sched_domain_node_span(cpu_to_node(i), &sd->span);
7458 sd->first_cpu = first_cpu(sd->span);
6639 sd->parent = p; 7459 sd->parent = p;
6640 if (p) 7460 if (p)
6641 p->child = sd; 7461 p->child = sd;
@@ -6644,94 +7464,120 @@ static int build_sched_domains(const cpumask_t *cpu_map)
6644 7464
6645 p = sd; 7465 p = sd;
6646 sd = &per_cpu(phys_domains, i); 7466 sd = &per_cpu(phys_domains, i);
6647 *sd = SD_CPU_INIT; 7467 SD_INIT(sd, CPU);
6648 sd->span = nodemask; 7468 set_domain_attribute(sd, attr);
7469 sd->span = *nodemask;
7470 sd->first_cpu = first_cpu(sd->span);
6649 sd->parent = p; 7471 sd->parent = p;
6650 if (p) 7472 if (p)
6651 p->child = sd; 7473 p->child = sd;
6652 cpu_to_phys_group(i, cpu_map, &sd->groups); 7474 cpu_to_phys_group(i, cpu_map, &sd->groups, tmpmask);
6653 7475
6654#ifdef CONFIG_SCHED_MC 7476#ifdef CONFIG_SCHED_MC
6655 p = sd; 7477 p = sd;
6656 sd = &per_cpu(core_domains, i); 7478 sd = &per_cpu(core_domains, i);
6657 *sd = SD_MC_INIT; 7479 SD_INIT(sd, MC);
7480 set_domain_attribute(sd, attr);
6658 sd->span = cpu_coregroup_map(i); 7481 sd->span = cpu_coregroup_map(i);
7482 sd->first_cpu = first_cpu(sd->span);
6659 cpus_and(sd->span, sd->span, *cpu_map); 7483 cpus_and(sd->span, sd->span, *cpu_map);
6660 sd->parent = p; 7484 sd->parent = p;
6661 p->child = sd; 7485 p->child = sd;
6662 cpu_to_core_group(i, cpu_map, &sd->groups); 7486 cpu_to_core_group(i, cpu_map, &sd->groups, tmpmask);
6663#endif 7487#endif
6664 7488
6665#ifdef CONFIG_SCHED_SMT 7489#ifdef CONFIG_SCHED_SMT
6666 p = sd; 7490 p = sd;
6667 sd = &per_cpu(cpu_domains, i); 7491 sd = &per_cpu(cpu_domains, i);
6668 *sd = SD_SIBLING_INIT; 7492 SD_INIT(sd, SIBLING);
7493 set_domain_attribute(sd, attr);
6669 sd->span = per_cpu(cpu_sibling_map, i); 7494 sd->span = per_cpu(cpu_sibling_map, i);
7495 sd->first_cpu = first_cpu(sd->span);
6670 cpus_and(sd->span, sd->span, *cpu_map); 7496 cpus_and(sd->span, sd->span, *cpu_map);
6671 sd->parent = p; 7497 sd->parent = p;
6672 p->child = sd; 7498 p->child = sd;
6673 cpu_to_cpu_group(i, cpu_map, &sd->groups); 7499 cpu_to_cpu_group(i, cpu_map, &sd->groups, tmpmask);
6674#endif 7500#endif
6675 } 7501 }
6676 7502
6677#ifdef CONFIG_SCHED_SMT 7503#ifdef CONFIG_SCHED_SMT
6678 /* Set up CPU (sibling) groups */ 7504 /* Set up CPU (sibling) groups */
6679 for_each_cpu_mask(i, *cpu_map) { 7505 for_each_cpu_mask(i, *cpu_map) {
6680 cpumask_t this_sibling_map = per_cpu(cpu_sibling_map, i); 7506 SCHED_CPUMASK_VAR(this_sibling_map, allmasks);
6681 cpus_and(this_sibling_map, this_sibling_map, *cpu_map); 7507 SCHED_CPUMASK_VAR(send_covered, allmasks);
6682 if (i != first_cpu(this_sibling_map)) 7508
7509 *this_sibling_map = per_cpu(cpu_sibling_map, i);
7510 cpus_and(*this_sibling_map, *this_sibling_map, *cpu_map);
7511 if (i != first_cpu(*this_sibling_map))
6683 continue; 7512 continue;
6684 7513
6685 init_sched_build_groups(this_sibling_map, cpu_map, 7514 init_sched_build_groups(this_sibling_map, cpu_map,
6686 &cpu_to_cpu_group); 7515 &cpu_to_cpu_group,
7516 send_covered, tmpmask);
6687 } 7517 }
6688#endif 7518#endif
6689 7519
6690#ifdef CONFIG_SCHED_MC 7520#ifdef CONFIG_SCHED_MC
6691 /* Set up multi-core groups */ 7521 /* Set up multi-core groups */
6692 for_each_cpu_mask(i, *cpu_map) { 7522 for_each_cpu_mask(i, *cpu_map) {
6693 cpumask_t this_core_map = cpu_coregroup_map(i); 7523 SCHED_CPUMASK_VAR(this_core_map, allmasks);
6694 cpus_and(this_core_map, this_core_map, *cpu_map); 7524 SCHED_CPUMASK_VAR(send_covered, allmasks);
6695 if (i != first_cpu(this_core_map)) 7525
7526 *this_core_map = cpu_coregroup_map(i);
7527 cpus_and(*this_core_map, *this_core_map, *cpu_map);
7528 if (i != first_cpu(*this_core_map))
6696 continue; 7529 continue;
7530
6697 init_sched_build_groups(this_core_map, cpu_map, 7531 init_sched_build_groups(this_core_map, cpu_map,
6698 &cpu_to_core_group); 7532 &cpu_to_core_group,
7533 send_covered, tmpmask);
6699 } 7534 }
6700#endif 7535#endif
6701 7536
6702 /* Set up physical groups */ 7537 /* Set up physical groups */
6703 for (i = 0; i < MAX_NUMNODES; i++) { 7538 for (i = 0; i < MAX_NUMNODES; i++) {
6704 cpumask_t nodemask = node_to_cpumask(i); 7539 SCHED_CPUMASK_VAR(nodemask, allmasks);
7540 SCHED_CPUMASK_VAR(send_covered, allmasks);
6705 7541
6706 cpus_and(nodemask, nodemask, *cpu_map); 7542 *nodemask = node_to_cpumask(i);
6707 if (cpus_empty(nodemask)) 7543 cpus_and(*nodemask, *nodemask, *cpu_map);
7544 if (cpus_empty(*nodemask))
6708 continue; 7545 continue;
6709 7546
6710 init_sched_build_groups(nodemask, cpu_map, &cpu_to_phys_group); 7547 init_sched_build_groups(nodemask, cpu_map,
7548 &cpu_to_phys_group,
7549 send_covered, tmpmask);
6711 } 7550 }
6712 7551
6713#ifdef CONFIG_NUMA 7552#ifdef CONFIG_NUMA
6714 /* Set up node groups */ 7553 /* Set up node groups */
6715 if (sd_allnodes) 7554 if (sd_allnodes) {
6716 init_sched_build_groups(*cpu_map, cpu_map, 7555 SCHED_CPUMASK_VAR(send_covered, allmasks);
6717 &cpu_to_allnodes_group); 7556
7557 init_sched_build_groups(cpu_map, cpu_map,
7558 &cpu_to_allnodes_group,
7559 send_covered, tmpmask);
7560 }
6718 7561
6719 for (i = 0; i < MAX_NUMNODES; i++) { 7562 for (i = 0; i < MAX_NUMNODES; i++) {
6720 /* Set up node groups */ 7563 /* Set up node groups */
6721 struct sched_group *sg, *prev; 7564 struct sched_group *sg, *prev;
6722 cpumask_t nodemask = node_to_cpumask(i); 7565 SCHED_CPUMASK_VAR(nodemask, allmasks);
6723 cpumask_t domainspan; 7566 SCHED_CPUMASK_VAR(domainspan, allmasks);
6724 cpumask_t covered = CPU_MASK_NONE; 7567 SCHED_CPUMASK_VAR(covered, allmasks);
6725 int j; 7568 int j;
6726 7569
6727 cpus_and(nodemask, nodemask, *cpu_map); 7570 *nodemask = node_to_cpumask(i);
6728 if (cpus_empty(nodemask)) { 7571 cpus_clear(*covered);
7572
7573 cpus_and(*nodemask, *nodemask, *cpu_map);
7574 if (cpus_empty(*nodemask)) {
6729 sched_group_nodes[i] = NULL; 7575 sched_group_nodes[i] = NULL;
6730 continue; 7576 continue;
6731 } 7577 }
6732 7578
6733 domainspan = sched_domain_node_span(i); 7579 sched_domain_node_span(i, domainspan);
6734 cpus_and(domainspan, domainspan, *cpu_map); 7580 cpus_and(*domainspan, *domainspan, *cpu_map);
6735 7581
6736 sg = kmalloc_node(sizeof(struct sched_group), GFP_KERNEL, i); 7582 sg = kmalloc_node(sizeof(struct sched_group), GFP_KERNEL, i);
6737 if (!sg) { 7583 if (!sg) {
@@ -6740,31 +7586,31 @@ static int build_sched_domains(const cpumask_t *cpu_map)
6740 goto error; 7586 goto error;
6741 } 7587 }
6742 sched_group_nodes[i] = sg; 7588 sched_group_nodes[i] = sg;
6743 for_each_cpu_mask(j, nodemask) { 7589 for_each_cpu_mask(j, *nodemask) {
6744 struct sched_domain *sd; 7590 struct sched_domain *sd;
6745 7591
6746 sd = &per_cpu(node_domains, j); 7592 sd = &per_cpu(node_domains, j);
6747 sd->groups = sg; 7593 sd->groups = sg;
6748 } 7594 }
6749 sg->__cpu_power = 0; 7595 sg->__cpu_power = 0;
6750 sg->cpumask = nodemask; 7596 sg->cpumask = *nodemask;
6751 sg->next = sg; 7597 sg->next = sg;
6752 cpus_or(covered, covered, nodemask); 7598 cpus_or(*covered, *covered, *nodemask);
6753 prev = sg; 7599 prev = sg;
6754 7600
6755 for (j = 0; j < MAX_NUMNODES; j++) { 7601 for (j = 0; j < MAX_NUMNODES; j++) {
6756 cpumask_t tmp, notcovered; 7602 SCHED_CPUMASK_VAR(notcovered, allmasks);
6757 int n = (i + j) % MAX_NUMNODES; 7603 int n = (i + j) % MAX_NUMNODES;
7604 node_to_cpumask_ptr(pnodemask, n);
6758 7605
6759 cpus_complement(notcovered, covered); 7606 cpus_complement(*notcovered, *covered);
6760 cpus_and(tmp, notcovered, *cpu_map); 7607 cpus_and(*tmpmask, *notcovered, *cpu_map);
6761 cpus_and(tmp, tmp, domainspan); 7608 cpus_and(*tmpmask, *tmpmask, *domainspan);
6762 if (cpus_empty(tmp)) 7609 if (cpus_empty(*tmpmask))
6763 break; 7610 break;
6764 7611
6765 nodemask = node_to_cpumask(n); 7612 cpus_and(*tmpmask, *tmpmask, *pnodemask);
6766 cpus_and(tmp, tmp, nodemask); 7613 if (cpus_empty(*tmpmask))
6767 if (cpus_empty(tmp))
6768 continue; 7614 continue;
6769 7615
6770 sg = kmalloc_node(sizeof(struct sched_group), 7616 sg = kmalloc_node(sizeof(struct sched_group),
@@ -6775,9 +7621,9 @@ static int build_sched_domains(const cpumask_t *cpu_map)
6775 goto error; 7621 goto error;
6776 } 7622 }
6777 sg->__cpu_power = 0; 7623 sg->__cpu_power = 0;
6778 sg->cpumask = tmp; 7624 sg->cpumask = *tmpmask;
6779 sg->next = prev->next; 7625 sg->next = prev->next;
6780 cpus_or(covered, covered, tmp); 7626 cpus_or(*covered, *covered, *tmpmask);
6781 prev->next = sg; 7627 prev->next = sg;
6782 prev = sg; 7628 prev = sg;
6783 } 7629 }
@@ -6813,7 +7659,8 @@ static int build_sched_domains(const cpumask_t *cpu_map)
6813 if (sd_allnodes) { 7659 if (sd_allnodes) {
6814 struct sched_group *sg; 7660 struct sched_group *sg;
6815 7661
6816 cpu_to_allnodes_group(first_cpu(*cpu_map), cpu_map, &sg); 7662 cpu_to_allnodes_group(first_cpu(*cpu_map), cpu_map, &sg,
7663 tmpmask);
6817 init_numa_sched_groups_power(sg); 7664 init_numa_sched_groups_power(sg);
6818 } 7665 }
6819#endif 7666#endif
@@ -6831,17 +7678,26 @@ static int build_sched_domains(const cpumask_t *cpu_map)
6831 cpu_attach_domain(sd, rd, i); 7678 cpu_attach_domain(sd, rd, i);
6832 } 7679 }
6833 7680
7681 SCHED_CPUMASK_FREE((void *)allmasks);
6834 return 0; 7682 return 0;
6835 7683
6836#ifdef CONFIG_NUMA 7684#ifdef CONFIG_NUMA
6837error: 7685error:
6838 free_sched_groups(cpu_map); 7686 free_sched_groups(cpu_map, tmpmask);
7687 SCHED_CPUMASK_FREE((void *)allmasks);
6839 return -ENOMEM; 7688 return -ENOMEM;
6840#endif 7689#endif
6841} 7690}
6842 7691
7692static int build_sched_domains(const cpumask_t *cpu_map)
7693{
7694 return __build_sched_domains(cpu_map, NULL);
7695}
7696
6843static cpumask_t *doms_cur; /* current sched domains */ 7697static cpumask_t *doms_cur; /* current sched domains */
6844static int ndoms_cur; /* number of sched domains in 'doms_cur' */ 7698static int ndoms_cur; /* number of sched domains in 'doms_cur' */
7699static struct sched_domain_attr *dattr_cur; /* attribues of custom domains
7700 in 'doms_cur' */
6845 7701
6846/* 7702/*
6847 * Special case: If a kmalloc of a doms_cur partition (array of 7703 * Special case: If a kmalloc of a doms_cur partition (array of
@@ -6869,15 +7725,17 @@ static int arch_init_sched_domains(const cpumask_t *cpu_map)
6869 if (!doms_cur) 7725 if (!doms_cur)
6870 doms_cur = &fallback_doms; 7726 doms_cur = &fallback_doms;
6871 cpus_andnot(*doms_cur, *cpu_map, cpu_isolated_map); 7727 cpus_andnot(*doms_cur, *cpu_map, cpu_isolated_map);
7728 dattr_cur = NULL;
6872 err = build_sched_domains(doms_cur); 7729 err = build_sched_domains(doms_cur);
6873 register_sched_domain_sysctl(); 7730 register_sched_domain_sysctl();
6874 7731
6875 return err; 7732 return err;
6876} 7733}
6877 7734
6878static void arch_destroy_sched_domains(const cpumask_t *cpu_map) 7735static void arch_destroy_sched_domains(const cpumask_t *cpu_map,
7736 cpumask_t *tmpmask)
6879{ 7737{
6880 free_sched_groups(cpu_map); 7738 free_sched_groups(cpu_map, tmpmask);
6881} 7739}
6882 7740
6883/* 7741/*
@@ -6886,6 +7744,7 @@ static void arch_destroy_sched_domains(const cpumask_t *cpu_map)
6886 */ 7744 */
6887static void detach_destroy_domains(const cpumask_t *cpu_map) 7745static void detach_destroy_domains(const cpumask_t *cpu_map)
6888{ 7746{
7747 cpumask_t tmpmask;
6889 int i; 7748 int i;
6890 7749
6891 unregister_sched_domain_sysctl(); 7750 unregister_sched_domain_sysctl();
@@ -6893,7 +7752,23 @@ static void detach_destroy_domains(const cpumask_t *cpu_map)
6893 for_each_cpu_mask(i, *cpu_map) 7752 for_each_cpu_mask(i, *cpu_map)
6894 cpu_attach_domain(NULL, &def_root_domain, i); 7753 cpu_attach_domain(NULL, &def_root_domain, i);
6895 synchronize_sched(); 7754 synchronize_sched();
6896 arch_destroy_sched_domains(cpu_map); 7755 arch_destroy_sched_domains(cpu_map, &tmpmask);
7756}
7757
7758/* handle null as "default" */
7759static int dattrs_equal(struct sched_domain_attr *cur, int idx_cur,
7760 struct sched_domain_attr *new, int idx_new)
7761{
7762 struct sched_domain_attr tmp;
7763
7764 /* fast path */
7765 if (!new && !cur)
7766 return 1;
7767
7768 tmp = SD_ATTR_INIT;
7769 return !memcmp(cur ? (cur + idx_cur) : &tmp,
7770 new ? (new + idx_new) : &tmp,
7771 sizeof(struct sched_domain_attr));
6897} 7772}
6898 7773
6899/* 7774/*
@@ -6917,7 +7792,8 @@ static void detach_destroy_domains(const cpumask_t *cpu_map)
6917 * 7792 *
6918 * Call with hotplug lock held 7793 * Call with hotplug lock held
6919 */ 7794 */
6920void partition_sched_domains(int ndoms_new, cpumask_t *doms_new) 7795void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
7796 struct sched_domain_attr *dattr_new)
6921{ 7797{
6922 int i, j; 7798 int i, j;
6923 7799
@@ -6930,12 +7806,14 @@ void partition_sched_domains(int ndoms_new, cpumask_t *doms_new)
6930 ndoms_new = 1; 7806 ndoms_new = 1;
6931 doms_new = &fallback_doms; 7807 doms_new = &fallback_doms;
6932 cpus_andnot(doms_new[0], cpu_online_map, cpu_isolated_map); 7808 cpus_andnot(doms_new[0], cpu_online_map, cpu_isolated_map);
7809 dattr_new = NULL;
6933 } 7810 }
6934 7811
6935 /* Destroy deleted domains */ 7812 /* Destroy deleted domains */
6936 for (i = 0; i < ndoms_cur; i++) { 7813 for (i = 0; i < ndoms_cur; i++) {
6937 for (j = 0; j < ndoms_new; j++) { 7814 for (j = 0; j < ndoms_new; j++) {
6938 if (cpus_equal(doms_cur[i], doms_new[j])) 7815 if (cpus_equal(doms_cur[i], doms_new[j])
7816 && dattrs_equal(dattr_cur, i, dattr_new, j))
6939 goto match1; 7817 goto match1;
6940 } 7818 }
6941 /* no match - a current sched domain not in new doms_new[] */ 7819 /* no match - a current sched domain not in new doms_new[] */
@@ -6947,11 +7825,13 @@ match1:
6947 /* Build new domains */ 7825 /* Build new domains */
6948 for (i = 0; i < ndoms_new; i++) { 7826 for (i = 0; i < ndoms_new; i++) {
6949 for (j = 0; j < ndoms_cur; j++) { 7827 for (j = 0; j < ndoms_cur; j++) {
6950 if (cpus_equal(doms_new[i], doms_cur[j])) 7828 if (cpus_equal(doms_new[i], doms_cur[j])
7829 && dattrs_equal(dattr_new, i, dattr_cur, j))
6951 goto match2; 7830 goto match2;
6952 } 7831 }
6953 /* no match - add a new doms_new */ 7832 /* no match - add a new doms_new */
6954 build_sched_domains(doms_new + i); 7833 __build_sched_domains(doms_new + i,
7834 dattr_new ? dattr_new + i : NULL);
6955match2: 7835match2:
6956 ; 7836 ;
6957 } 7837 }
@@ -6959,7 +7839,9 @@ match2:
6959 /* Remember the new sched domains */ 7839 /* Remember the new sched domains */
6960 if (doms_cur != &fallback_doms) 7840 if (doms_cur != &fallback_doms)
6961 kfree(doms_cur); 7841 kfree(doms_cur);
7842 kfree(dattr_cur); /* kfree(NULL) is safe */
6962 doms_cur = doms_new; 7843 doms_cur = doms_new;
7844 dattr_cur = dattr_new;
6963 ndoms_cur = ndoms_new; 7845 ndoms_cur = ndoms_new;
6964 7846
6965 register_sched_domain_sysctl(); 7847 register_sched_domain_sysctl();
@@ -7086,6 +7968,11 @@ void __init sched_init_smp(void)
7086{ 7968{
7087 cpumask_t non_isolated_cpus; 7969 cpumask_t non_isolated_cpus;
7088 7970
7971#if defined(CONFIG_NUMA)
7972 sched_group_nodes_bycpu = kzalloc(nr_cpu_ids * sizeof(void **),
7973 GFP_KERNEL);
7974 BUG_ON(sched_group_nodes_bycpu == NULL);
7975#endif
7089 get_online_cpus(); 7976 get_online_cpus();
7090 arch_init_sched_domains(&cpu_online_map); 7977 arch_init_sched_domains(&cpu_online_map);
7091 cpus_andnot(non_isolated_cpus, cpu_possible_map, cpu_isolated_map); 7978 cpus_andnot(non_isolated_cpus, cpu_possible_map, cpu_isolated_map);
@@ -7096,13 +7983,18 @@ void __init sched_init_smp(void)
7096 hotcpu_notifier(update_sched_domains, 0); 7983 hotcpu_notifier(update_sched_domains, 0);
7097 7984
7098 /* Move init over to a non-isolated CPU */ 7985 /* Move init over to a non-isolated CPU */
7099 if (set_cpus_allowed(current, non_isolated_cpus) < 0) 7986 if (set_cpus_allowed_ptr(current, &non_isolated_cpus) < 0)
7100 BUG(); 7987 BUG();
7101 sched_init_granularity(); 7988 sched_init_granularity();
7102} 7989}
7103#else 7990#else
7104void __init sched_init_smp(void) 7991void __init sched_init_smp(void)
7105{ 7992{
7993#if defined(CONFIG_NUMA)
7994 sched_group_nodes_bycpu = kzalloc(nr_cpu_ids * sizeof(void **),
7995 GFP_KERNEL);
7996 BUG_ON(sched_group_nodes_bycpu == NULL);
7997#endif
7106 sched_init_granularity(); 7998 sched_init_granularity();
7107} 7999}
7108#endif /* CONFIG_SMP */ 8000#endif /* CONFIG_SMP */
@@ -7117,6 +8009,7 @@ int in_sched_functions(unsigned long addr)
7117static void init_cfs_rq(struct cfs_rq *cfs_rq, struct rq *rq) 8009static void init_cfs_rq(struct cfs_rq *cfs_rq, struct rq *rq)
7118{ 8010{
7119 cfs_rq->tasks_timeline = RB_ROOT; 8011 cfs_rq->tasks_timeline = RB_ROOT;
8012 INIT_LIST_HEAD(&cfs_rq->tasks);
7120#ifdef CONFIG_FAIR_GROUP_SCHED 8013#ifdef CONFIG_FAIR_GROUP_SCHED
7121 cfs_rq->rq = rq; 8014 cfs_rq->rq = rq;
7122#endif 8015#endif
@@ -7146,6 +8039,8 @@ static void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
7146 8039
7147 rt_rq->rt_time = 0; 8040 rt_rq->rt_time = 0;
7148 rt_rq->rt_throttled = 0; 8041 rt_rq->rt_throttled = 0;
8042 rt_rq->rt_runtime = 0;
8043 spin_lock_init(&rt_rq->rt_runtime_lock);
7149 8044
7150#ifdef CONFIG_RT_GROUP_SCHED 8045#ifdef CONFIG_RT_GROUP_SCHED
7151 rt_rq->rt_nr_boosted = 0; 8046 rt_rq->rt_nr_boosted = 0;
@@ -7154,10 +8049,11 @@ static void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
7154} 8049}
7155 8050
7156#ifdef CONFIG_FAIR_GROUP_SCHED 8051#ifdef CONFIG_FAIR_GROUP_SCHED
7157static void init_tg_cfs_entry(struct rq *rq, struct task_group *tg, 8052static void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq,
7158 struct cfs_rq *cfs_rq, struct sched_entity *se, 8053 struct sched_entity *se, int cpu, int add,
7159 int cpu, int add) 8054 struct sched_entity *parent)
7160{ 8055{
8056 struct rq *rq = cpu_rq(cpu);
7161 tg->cfs_rq[cpu] = cfs_rq; 8057 tg->cfs_rq[cpu] = cfs_rq;
7162 init_cfs_rq(cfs_rq, rq); 8058 init_cfs_rq(cfs_rq, rq);
7163 cfs_rq->tg = tg; 8059 cfs_rq->tg = tg;
@@ -7165,45 +8061,132 @@ static void init_tg_cfs_entry(struct rq *rq, struct task_group *tg,
7165 list_add(&cfs_rq->leaf_cfs_rq_list, &rq->leaf_cfs_rq_list); 8061 list_add(&cfs_rq->leaf_cfs_rq_list, &rq->leaf_cfs_rq_list);
7166 8062
7167 tg->se[cpu] = se; 8063 tg->se[cpu] = se;
7168 se->cfs_rq = &rq->cfs; 8064 /* se could be NULL for init_task_group */
8065 if (!se)
8066 return;
8067
8068 if (!parent)
8069 se->cfs_rq = &rq->cfs;
8070 else
8071 se->cfs_rq = parent->my_q;
8072
7169 se->my_q = cfs_rq; 8073 se->my_q = cfs_rq;
7170 se->load.weight = tg->shares; 8074 se->load.weight = tg->shares;
7171 se->load.inv_weight = div64_64(1ULL<<32, se->load.weight); 8075 se->load.inv_weight = div64_64(1ULL<<32, se->load.weight);
7172 se->parent = NULL; 8076 se->parent = parent;
7173} 8077}
7174#endif 8078#endif
7175 8079
7176#ifdef CONFIG_RT_GROUP_SCHED 8080#ifdef CONFIG_RT_GROUP_SCHED
7177static void init_tg_rt_entry(struct rq *rq, struct task_group *tg, 8081static void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
7178 struct rt_rq *rt_rq, struct sched_rt_entity *rt_se, 8082 struct sched_rt_entity *rt_se, int cpu, int add,
7179 int cpu, int add) 8083 struct sched_rt_entity *parent)
7180{ 8084{
8085 struct rq *rq = cpu_rq(cpu);
8086
7181 tg->rt_rq[cpu] = rt_rq; 8087 tg->rt_rq[cpu] = rt_rq;
7182 init_rt_rq(rt_rq, rq); 8088 init_rt_rq(rt_rq, rq);
7183 rt_rq->tg = tg; 8089 rt_rq->tg = tg;
7184 rt_rq->rt_se = rt_se; 8090 rt_rq->rt_se = rt_se;
8091 rt_rq->rt_runtime = tg->rt_bandwidth.rt_runtime;
7185 if (add) 8092 if (add)
7186 list_add(&rt_rq->leaf_rt_rq_list, &rq->leaf_rt_rq_list); 8093 list_add(&rt_rq->leaf_rt_rq_list, &rq->leaf_rt_rq_list);
7187 8094
7188 tg->rt_se[cpu] = rt_se; 8095 tg->rt_se[cpu] = rt_se;
8096 if (!rt_se)
8097 return;
8098
8099 if (!parent)
8100 rt_se->rt_rq = &rq->rt;
8101 else
8102 rt_se->rt_rq = parent->my_q;
8103
7189 rt_se->rt_rq = &rq->rt; 8104 rt_se->rt_rq = &rq->rt;
7190 rt_se->my_q = rt_rq; 8105 rt_se->my_q = rt_rq;
7191 rt_se->parent = NULL; 8106 rt_se->parent = parent;
7192 INIT_LIST_HEAD(&rt_se->run_list); 8107 INIT_LIST_HEAD(&rt_se->run_list);
7193} 8108}
7194#endif 8109#endif
7195 8110
7196void __init sched_init(void) 8111void __init sched_init(void)
7197{ 8112{
7198 int highest_cpu = 0;
7199 int i, j; 8113 int i, j;
8114 unsigned long alloc_size = 0, ptr;
8115
8116#ifdef CONFIG_FAIR_GROUP_SCHED
8117 alloc_size += 2 * nr_cpu_ids * sizeof(void **);
8118#endif
8119#ifdef CONFIG_RT_GROUP_SCHED
8120 alloc_size += 2 * nr_cpu_ids * sizeof(void **);
8121#endif
8122#ifdef CONFIG_USER_SCHED
8123 alloc_size *= 2;
8124#endif
8125 /*
8126 * As sched_init() is called before page_alloc is setup,
8127 * we use alloc_bootmem().
8128 */
8129 if (alloc_size) {
8130 ptr = (unsigned long)alloc_bootmem_low(alloc_size);
8131
8132#ifdef CONFIG_FAIR_GROUP_SCHED
8133 init_task_group.se = (struct sched_entity **)ptr;
8134 ptr += nr_cpu_ids * sizeof(void **);
8135
8136 init_task_group.cfs_rq = (struct cfs_rq **)ptr;
8137 ptr += nr_cpu_ids * sizeof(void **);
8138
8139#ifdef CONFIG_USER_SCHED
8140 root_task_group.se = (struct sched_entity **)ptr;
8141 ptr += nr_cpu_ids * sizeof(void **);
8142
8143 root_task_group.cfs_rq = (struct cfs_rq **)ptr;
8144 ptr += nr_cpu_ids * sizeof(void **);
8145#endif
8146#endif
8147#ifdef CONFIG_RT_GROUP_SCHED
8148 init_task_group.rt_se = (struct sched_rt_entity **)ptr;
8149 ptr += nr_cpu_ids * sizeof(void **);
8150
8151 init_task_group.rt_rq = (struct rt_rq **)ptr;
8152 ptr += nr_cpu_ids * sizeof(void **);
8153
8154#ifdef CONFIG_USER_SCHED
8155 root_task_group.rt_se = (struct sched_rt_entity **)ptr;
8156 ptr += nr_cpu_ids * sizeof(void **);
8157
8158 root_task_group.rt_rq = (struct rt_rq **)ptr;
8159 ptr += nr_cpu_ids * sizeof(void **);
8160#endif
8161#endif
8162 }
7200 8163
7201#ifdef CONFIG_SMP 8164#ifdef CONFIG_SMP
8165 init_aggregate();
7202 init_defrootdomain(); 8166 init_defrootdomain();
7203#endif 8167#endif
7204 8168
8169 init_rt_bandwidth(&def_rt_bandwidth,
8170 global_rt_period(), global_rt_runtime());
8171
8172#ifdef CONFIG_RT_GROUP_SCHED
8173 init_rt_bandwidth(&init_task_group.rt_bandwidth,
8174 global_rt_period(), global_rt_runtime());
8175#ifdef CONFIG_USER_SCHED
8176 init_rt_bandwidth(&root_task_group.rt_bandwidth,
8177 global_rt_period(), RUNTIME_INF);
8178#endif
8179#endif
8180
7205#ifdef CONFIG_GROUP_SCHED 8181#ifdef CONFIG_GROUP_SCHED
7206 list_add(&init_task_group.list, &task_groups); 8182 list_add(&init_task_group.list, &task_groups);
8183 INIT_LIST_HEAD(&init_task_group.children);
8184
8185#ifdef CONFIG_USER_SCHED
8186 INIT_LIST_HEAD(&root_task_group.children);
8187 init_task_group.parent = &root_task_group;
8188 list_add(&init_task_group.siblings, &root_task_group.children);
8189#endif
7207#endif 8190#endif
7208 8191
7209 for_each_possible_cpu(i) { 8192 for_each_possible_cpu(i) {
@@ -7214,26 +8197,68 @@ void __init sched_init(void)
7214 lockdep_set_class(&rq->lock, &rq->rq_lock_key); 8197 lockdep_set_class(&rq->lock, &rq->rq_lock_key);
7215 rq->nr_running = 0; 8198 rq->nr_running = 0;
7216 rq->clock = 1; 8199 rq->clock = 1;
8200 update_last_tick_seen(rq);
7217 init_cfs_rq(&rq->cfs, rq); 8201 init_cfs_rq(&rq->cfs, rq);
7218 init_rt_rq(&rq->rt, rq); 8202 init_rt_rq(&rq->rt, rq);
7219#ifdef CONFIG_FAIR_GROUP_SCHED 8203#ifdef CONFIG_FAIR_GROUP_SCHED
7220 init_task_group.shares = init_task_group_load; 8204 init_task_group.shares = init_task_group_load;
7221 INIT_LIST_HEAD(&rq->leaf_cfs_rq_list); 8205 INIT_LIST_HEAD(&rq->leaf_cfs_rq_list);
7222 init_tg_cfs_entry(rq, &init_task_group, 8206#ifdef CONFIG_CGROUP_SCHED
8207 /*
8208 * How much cpu bandwidth does init_task_group get?
8209 *
8210 * In case of task-groups formed thr' the cgroup filesystem, it
8211 * gets 100% of the cpu resources in the system. This overall
8212 * system cpu resource is divided among the tasks of
8213 * init_task_group and its child task-groups in a fair manner,
8214 * based on each entity's (task or task-group's) weight
8215 * (se->load.weight).
8216 *
8217 * In other words, if init_task_group has 10 tasks of weight
8218 * 1024) and two child groups A0 and A1 (of weight 1024 each),
8219 * then A0's share of the cpu resource is:
8220 *
8221 * A0's bandwidth = 1024 / (10*1024 + 1024 + 1024) = 8.33%
8222 *
8223 * We achieve this by letting init_task_group's tasks sit
8224 * directly in rq->cfs (i.e init_task_group->se[] = NULL).
8225 */
8226 init_tg_cfs_entry(&init_task_group, &rq->cfs, NULL, i, 1, NULL);
8227#elif defined CONFIG_USER_SCHED
8228 root_task_group.shares = NICE_0_LOAD;
8229 init_tg_cfs_entry(&root_task_group, &rq->cfs, NULL, i, 0, NULL);
8230 /*
8231 * In case of task-groups formed thr' the user id of tasks,
8232 * init_task_group represents tasks belonging to root user.
8233 * Hence it forms a sibling of all subsequent groups formed.
8234 * In this case, init_task_group gets only a fraction of overall
8235 * system cpu resource, based on the weight assigned to root
8236 * user's cpu share (INIT_TASK_GROUP_LOAD). This is accomplished
8237 * by letting tasks of init_task_group sit in a separate cfs_rq
8238 * (init_cfs_rq) and having one entity represent this group of
8239 * tasks in rq->cfs (i.e init_task_group->se[] != NULL).
8240 */
8241 init_tg_cfs_entry(&init_task_group,
7223 &per_cpu(init_cfs_rq, i), 8242 &per_cpu(init_cfs_rq, i),
7224 &per_cpu(init_sched_entity, i), i, 1); 8243 &per_cpu(init_sched_entity, i), i, 1,
8244 root_task_group.se[i]);
7225 8245
7226#endif 8246#endif
8247#endif /* CONFIG_FAIR_GROUP_SCHED */
8248
8249 rq->rt.rt_runtime = def_rt_bandwidth.rt_runtime;
7227#ifdef CONFIG_RT_GROUP_SCHED 8250#ifdef CONFIG_RT_GROUP_SCHED
7228 init_task_group.rt_runtime =
7229 sysctl_sched_rt_runtime * NSEC_PER_USEC;
7230 INIT_LIST_HEAD(&rq->leaf_rt_rq_list); 8251 INIT_LIST_HEAD(&rq->leaf_rt_rq_list);
7231 init_tg_rt_entry(rq, &init_task_group, 8252#ifdef CONFIG_CGROUP_SCHED
8253 init_tg_rt_entry(&init_task_group, &rq->rt, NULL, i, 1, NULL);
8254#elif defined CONFIG_USER_SCHED
8255 init_tg_rt_entry(&root_task_group, &rq->rt, NULL, i, 0, NULL);
8256 init_tg_rt_entry(&init_task_group,
7232 &per_cpu(init_rt_rq, i), 8257 &per_cpu(init_rt_rq, i),
7233 &per_cpu(init_sched_rt_entity, i), i, 1); 8258 &per_cpu(init_sched_rt_entity, i), i, 1,
8259 root_task_group.rt_se[i]);
8260#endif
7234#endif 8261#endif
7235 rq->rt_period_expire = 0;
7236 rq->rt_throttled = 0;
7237 8262
7238 for (j = 0; j < CPU_LOAD_IDX_MAX; j++) 8263 for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
7239 rq->cpu_load[j] = 0; 8264 rq->cpu_load[j] = 0;
@@ -7250,7 +8275,6 @@ void __init sched_init(void)
7250#endif 8275#endif
7251 init_rq_hrtick(rq); 8276 init_rq_hrtick(rq);
7252 atomic_set(&rq->nr_iowait, 0); 8277 atomic_set(&rq->nr_iowait, 0);
7253 highest_cpu = i;
7254 } 8278 }
7255 8279
7256 set_load_weight(&init_task); 8280 set_load_weight(&init_task);
@@ -7260,7 +8284,6 @@ void __init sched_init(void)
7260#endif 8284#endif
7261 8285
7262#ifdef CONFIG_SMP 8286#ifdef CONFIG_SMP
7263 nr_cpu_ids = highest_cpu + 1;
7264 open_softirq(SCHED_SOFTIRQ, run_rebalance_domains, NULL); 8287 open_softirq(SCHED_SOFTIRQ, run_rebalance_domains, NULL);
7265#endif 8288#endif
7266 8289
@@ -7419,8 +8442,6 @@ void set_curr_task(int cpu, struct task_struct *p)
7419 8442
7420#endif 8443#endif
7421 8444
7422#ifdef CONFIG_GROUP_SCHED
7423
7424#ifdef CONFIG_FAIR_GROUP_SCHED 8445#ifdef CONFIG_FAIR_GROUP_SCHED
7425static void free_fair_sched_group(struct task_group *tg) 8446static void free_fair_sched_group(struct task_group *tg)
7426{ 8447{
@@ -7437,17 +8458,18 @@ static void free_fair_sched_group(struct task_group *tg)
7437 kfree(tg->se); 8458 kfree(tg->se);
7438} 8459}
7439 8460
7440static int alloc_fair_sched_group(struct task_group *tg) 8461static
8462int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
7441{ 8463{
7442 struct cfs_rq *cfs_rq; 8464 struct cfs_rq *cfs_rq;
7443 struct sched_entity *se; 8465 struct sched_entity *se, *parent_se;
7444 struct rq *rq; 8466 struct rq *rq;
7445 int i; 8467 int i;
7446 8468
7447 tg->cfs_rq = kzalloc(sizeof(cfs_rq) * NR_CPUS, GFP_KERNEL); 8469 tg->cfs_rq = kzalloc(sizeof(cfs_rq) * nr_cpu_ids, GFP_KERNEL);
7448 if (!tg->cfs_rq) 8470 if (!tg->cfs_rq)
7449 goto err; 8471 goto err;
7450 tg->se = kzalloc(sizeof(se) * NR_CPUS, GFP_KERNEL); 8472 tg->se = kzalloc(sizeof(se) * nr_cpu_ids, GFP_KERNEL);
7451 if (!tg->se) 8473 if (!tg->se)
7452 goto err; 8474 goto err;
7453 8475
@@ -7466,7 +8488,8 @@ static int alloc_fair_sched_group(struct task_group *tg)
7466 if (!se) 8488 if (!se)
7467 goto err; 8489 goto err;
7468 8490
7469 init_tg_cfs_entry(rq, tg, cfs_rq, se, i, 0); 8491 parent_se = parent ? parent->se[i] : NULL;
8492 init_tg_cfs_entry(tg, cfs_rq, se, i, 0, parent_se);
7470 } 8493 }
7471 8494
7472 return 1; 8495 return 1;
@@ -7490,7 +8513,8 @@ static inline void free_fair_sched_group(struct task_group *tg)
7490{ 8513{
7491} 8514}
7492 8515
7493static inline int alloc_fair_sched_group(struct task_group *tg) 8516static inline
8517int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
7494{ 8518{
7495 return 1; 8519 return 1;
7496} 8520}
@@ -7509,6 +8533,8 @@ static void free_rt_sched_group(struct task_group *tg)
7509{ 8533{
7510 int i; 8534 int i;
7511 8535
8536 destroy_rt_bandwidth(&tg->rt_bandwidth);
8537
7512 for_each_possible_cpu(i) { 8538 for_each_possible_cpu(i) {
7513 if (tg->rt_rq) 8539 if (tg->rt_rq)
7514 kfree(tg->rt_rq[i]); 8540 kfree(tg->rt_rq[i]);
@@ -7520,21 +8546,23 @@ static void free_rt_sched_group(struct task_group *tg)
7520 kfree(tg->rt_se); 8546 kfree(tg->rt_se);
7521} 8547}
7522 8548
7523static int alloc_rt_sched_group(struct task_group *tg) 8549static
8550int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
7524{ 8551{
7525 struct rt_rq *rt_rq; 8552 struct rt_rq *rt_rq;
7526 struct sched_rt_entity *rt_se; 8553 struct sched_rt_entity *rt_se, *parent_se;
7527 struct rq *rq; 8554 struct rq *rq;
7528 int i; 8555 int i;
7529 8556
7530 tg->rt_rq = kzalloc(sizeof(rt_rq) * NR_CPUS, GFP_KERNEL); 8557 tg->rt_rq = kzalloc(sizeof(rt_rq) * nr_cpu_ids, GFP_KERNEL);
7531 if (!tg->rt_rq) 8558 if (!tg->rt_rq)
7532 goto err; 8559 goto err;
7533 tg->rt_se = kzalloc(sizeof(rt_se) * NR_CPUS, GFP_KERNEL); 8560 tg->rt_se = kzalloc(sizeof(rt_se) * nr_cpu_ids, GFP_KERNEL);
7534 if (!tg->rt_se) 8561 if (!tg->rt_se)
7535 goto err; 8562 goto err;
7536 8563
7537 tg->rt_runtime = 0; 8564 init_rt_bandwidth(&tg->rt_bandwidth,
8565 ktime_to_ns(def_rt_bandwidth.rt_period), 0);
7538 8566
7539 for_each_possible_cpu(i) { 8567 for_each_possible_cpu(i) {
7540 rq = cpu_rq(i); 8568 rq = cpu_rq(i);
@@ -7549,7 +8577,8 @@ static int alloc_rt_sched_group(struct task_group *tg)
7549 if (!rt_se) 8577 if (!rt_se)
7550 goto err; 8578 goto err;
7551 8579
7552 init_tg_rt_entry(rq, tg, rt_rq, rt_se, i, 0); 8580 parent_se = parent ? parent->rt_se[i] : NULL;
8581 init_tg_rt_entry(tg, rt_rq, rt_se, i, 0, parent_se);
7553 } 8582 }
7554 8583
7555 return 1; 8584 return 1;
@@ -7573,7 +8602,8 @@ static inline void free_rt_sched_group(struct task_group *tg)
7573{ 8602{
7574} 8603}
7575 8604
7576static inline int alloc_rt_sched_group(struct task_group *tg) 8605static inline
8606int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
7577{ 8607{
7578 return 1; 8608 return 1;
7579} 8609}
@@ -7587,6 +8617,7 @@ static inline void unregister_rt_sched_group(struct task_group *tg, int cpu)
7587} 8617}
7588#endif 8618#endif
7589 8619
8620#ifdef CONFIG_GROUP_SCHED
7590static void free_sched_group(struct task_group *tg) 8621static void free_sched_group(struct task_group *tg)
7591{ 8622{
7592 free_fair_sched_group(tg); 8623 free_fair_sched_group(tg);
@@ -7595,7 +8626,7 @@ static void free_sched_group(struct task_group *tg)
7595} 8626}
7596 8627
7597/* allocate runqueue etc for a new task group */ 8628/* allocate runqueue etc for a new task group */
7598struct task_group *sched_create_group(void) 8629struct task_group *sched_create_group(struct task_group *parent)
7599{ 8630{
7600 struct task_group *tg; 8631 struct task_group *tg;
7601 unsigned long flags; 8632 unsigned long flags;
@@ -7605,10 +8636,10 @@ struct task_group *sched_create_group(void)
7605 if (!tg) 8636 if (!tg)
7606 return ERR_PTR(-ENOMEM); 8637 return ERR_PTR(-ENOMEM);
7607 8638
7608 if (!alloc_fair_sched_group(tg)) 8639 if (!alloc_fair_sched_group(tg, parent))
7609 goto err; 8640 goto err;
7610 8641
7611 if (!alloc_rt_sched_group(tg)) 8642 if (!alloc_rt_sched_group(tg, parent))
7612 goto err; 8643 goto err;
7613 8644
7614 spin_lock_irqsave(&task_group_lock, flags); 8645 spin_lock_irqsave(&task_group_lock, flags);
@@ -7617,6 +8648,12 @@ struct task_group *sched_create_group(void)
7617 register_rt_sched_group(tg, i); 8648 register_rt_sched_group(tg, i);
7618 } 8649 }
7619 list_add_rcu(&tg->list, &task_groups); 8650 list_add_rcu(&tg->list, &task_groups);
8651
8652 WARN_ON(!parent); /* root should already exist */
8653
8654 tg->parent = parent;
8655 list_add_rcu(&tg->siblings, &parent->children);
8656 INIT_LIST_HEAD(&tg->children);
7620 spin_unlock_irqrestore(&task_group_lock, flags); 8657 spin_unlock_irqrestore(&task_group_lock, flags);
7621 8658
7622 return tg; 8659 return tg;
@@ -7645,6 +8682,7 @@ void sched_destroy_group(struct task_group *tg)
7645 unregister_rt_sched_group(tg, i); 8682 unregister_rt_sched_group(tg, i);
7646 } 8683 }
7647 list_del_rcu(&tg->list); 8684 list_del_rcu(&tg->list);
8685 list_del_rcu(&tg->siblings);
7648 spin_unlock_irqrestore(&task_group_lock, flags); 8686 spin_unlock_irqrestore(&task_group_lock, flags);
7649 8687
7650 /* wait for possible concurrent references to cfs_rqs complete */ 8688 /* wait for possible concurrent references to cfs_rqs complete */
@@ -7688,16 +8726,14 @@ void sched_move_task(struct task_struct *tsk)
7688 8726
7689 task_rq_unlock(rq, &flags); 8727 task_rq_unlock(rq, &flags);
7690} 8728}
8729#endif
7691 8730
7692#ifdef CONFIG_FAIR_GROUP_SCHED 8731#ifdef CONFIG_FAIR_GROUP_SCHED
7693static void set_se_shares(struct sched_entity *se, unsigned long shares) 8732static void __set_se_shares(struct sched_entity *se, unsigned long shares)
7694{ 8733{
7695 struct cfs_rq *cfs_rq = se->cfs_rq; 8734 struct cfs_rq *cfs_rq = se->cfs_rq;
7696 struct rq *rq = cfs_rq->rq;
7697 int on_rq; 8735 int on_rq;
7698 8736
7699 spin_lock_irq(&rq->lock);
7700
7701 on_rq = se->on_rq; 8737 on_rq = se->on_rq;
7702 if (on_rq) 8738 if (on_rq)
7703 dequeue_entity(cfs_rq, se, 0); 8739 dequeue_entity(cfs_rq, se, 0);
@@ -7707,8 +8743,17 @@ static void set_se_shares(struct sched_entity *se, unsigned long shares)
7707 8743
7708 if (on_rq) 8744 if (on_rq)
7709 enqueue_entity(cfs_rq, se, 0); 8745 enqueue_entity(cfs_rq, se, 0);
8746}
7710 8747
7711 spin_unlock_irq(&rq->lock); 8748static void set_se_shares(struct sched_entity *se, unsigned long shares)
8749{
8750 struct cfs_rq *cfs_rq = se->cfs_rq;
8751 struct rq *rq = cfs_rq->rq;
8752 unsigned long flags;
8753
8754 spin_lock_irqsave(&rq->lock, flags);
8755 __set_se_shares(se, shares);
8756 spin_unlock_irqrestore(&rq->lock, flags);
7712} 8757}
7713 8758
7714static DEFINE_MUTEX(shares_mutex); 8759static DEFINE_MUTEX(shares_mutex);
@@ -7719,12 +8764,18 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
7719 unsigned long flags; 8764 unsigned long flags;
7720 8765
7721 /* 8766 /*
8767 * We can't change the weight of the root cgroup.
8768 */
8769 if (!tg->se[0])
8770 return -EINVAL;
8771
8772 /*
7722 * A weight of 0 or 1 can cause arithmetics problems. 8773 * A weight of 0 or 1 can cause arithmetics problems.
7723 * (The default weight is 1024 - so there's no practical 8774 * (The default weight is 1024 - so there's no practical
7724 * limitation from this.) 8775 * limitation from this.)
7725 */ 8776 */
7726 if (shares < 2) 8777 if (shares < MIN_SHARES)
7727 shares = 2; 8778 shares = MIN_SHARES;
7728 8779
7729 mutex_lock(&shares_mutex); 8780 mutex_lock(&shares_mutex);
7730 if (tg->shares == shares) 8781 if (tg->shares == shares)
@@ -7733,6 +8784,7 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
7733 spin_lock_irqsave(&task_group_lock, flags); 8784 spin_lock_irqsave(&task_group_lock, flags);
7734 for_each_possible_cpu(i) 8785 for_each_possible_cpu(i)
7735 unregister_fair_sched_group(tg, i); 8786 unregister_fair_sched_group(tg, i);
8787 list_del_rcu(&tg->siblings);
7736 spin_unlock_irqrestore(&task_group_lock, flags); 8788 spin_unlock_irqrestore(&task_group_lock, flags);
7737 8789
7738 /* wait for any ongoing reference to this group to finish */ 8790 /* wait for any ongoing reference to this group to finish */
@@ -7743,8 +8795,13 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
7743 * w/o tripping rebalance_share or load_balance_fair. 8795 * w/o tripping rebalance_share or load_balance_fair.
7744 */ 8796 */
7745 tg->shares = shares; 8797 tg->shares = shares;
7746 for_each_possible_cpu(i) 8798 for_each_possible_cpu(i) {
7747 set_se_shares(tg->se[i], shares); 8799 /*
8800 * force a rebalance
8801 */
8802 cfs_rq_set_shares(tg->cfs_rq[i], 0);
8803 set_se_shares(tg->se[i], shares/nr_cpu_ids);
8804 }
7748 8805
7749 /* 8806 /*
7750 * Enable load balance activity on this group, by inserting it back on 8807 * Enable load balance activity on this group, by inserting it back on
@@ -7753,6 +8810,7 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
7753 spin_lock_irqsave(&task_group_lock, flags); 8810 spin_lock_irqsave(&task_group_lock, flags);
7754 for_each_possible_cpu(i) 8811 for_each_possible_cpu(i)
7755 register_fair_sched_group(tg, i); 8812 register_fair_sched_group(tg, i);
8813 list_add_rcu(&tg->siblings, &tg->parent->children);
7756 spin_unlock_irqrestore(&task_group_lock, flags); 8814 spin_unlock_irqrestore(&task_group_lock, flags);
7757done: 8815done:
7758 mutex_unlock(&shares_mutex); 8816 mutex_unlock(&shares_mutex);
@@ -7779,26 +8837,58 @@ static unsigned long to_ratio(u64 period, u64 runtime)
7779 return div64_64(runtime << 16, period); 8837 return div64_64(runtime << 16, period);
7780} 8838}
7781 8839
8840#ifdef CONFIG_CGROUP_SCHED
8841static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
8842{
8843 struct task_group *tgi, *parent = tg->parent;
8844 unsigned long total = 0;
8845
8846 if (!parent) {
8847 if (global_rt_period() < period)
8848 return 0;
8849
8850 return to_ratio(period, runtime) <
8851 to_ratio(global_rt_period(), global_rt_runtime());
8852 }
8853
8854 if (ktime_to_ns(parent->rt_bandwidth.rt_period) < period)
8855 return 0;
8856
8857 rcu_read_lock();
8858 list_for_each_entry_rcu(tgi, &parent->children, siblings) {
8859 if (tgi == tg)
8860 continue;
8861
8862 total += to_ratio(ktime_to_ns(tgi->rt_bandwidth.rt_period),
8863 tgi->rt_bandwidth.rt_runtime);
8864 }
8865 rcu_read_unlock();
8866
8867 return total + to_ratio(period, runtime) <
8868 to_ratio(ktime_to_ns(parent->rt_bandwidth.rt_period),
8869 parent->rt_bandwidth.rt_runtime);
8870}
8871#elif defined CONFIG_USER_SCHED
7782static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime) 8872static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
7783{ 8873{
7784 struct task_group *tgi; 8874 struct task_group *tgi;
7785 unsigned long total = 0; 8875 unsigned long total = 0;
7786 unsigned long global_ratio = 8876 unsigned long global_ratio =
7787 to_ratio(sysctl_sched_rt_period, 8877 to_ratio(global_rt_period(), global_rt_runtime());
7788 sysctl_sched_rt_runtime < 0 ?
7789 RUNTIME_INF : sysctl_sched_rt_runtime);
7790 8878
7791 rcu_read_lock(); 8879 rcu_read_lock();
7792 list_for_each_entry_rcu(tgi, &task_groups, list) { 8880 list_for_each_entry_rcu(tgi, &task_groups, list) {
7793 if (tgi == tg) 8881 if (tgi == tg)
7794 continue; 8882 continue;
7795 8883
7796 total += to_ratio(period, tgi->rt_runtime); 8884 total += to_ratio(ktime_to_ns(tgi->rt_bandwidth.rt_period),
8885 tgi->rt_bandwidth.rt_runtime);
7797 } 8886 }
7798 rcu_read_unlock(); 8887 rcu_read_unlock();
7799 8888
7800 return total + to_ratio(period, runtime) < global_ratio; 8889 return total + to_ratio(period, runtime) < global_ratio;
7801} 8890}
8891#endif
7802 8892
7803/* Must be called with tasklist_lock held */ 8893/* Must be called with tasklist_lock held */
7804static inline int tg_has_rt_tasks(struct task_group *tg) 8894static inline int tg_has_rt_tasks(struct task_group *tg)
@@ -7811,19 +8901,14 @@ static inline int tg_has_rt_tasks(struct task_group *tg)
7811 return 0; 8901 return 0;
7812} 8902}
7813 8903
7814int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us) 8904static int tg_set_bandwidth(struct task_group *tg,
8905 u64 rt_period, u64 rt_runtime)
7815{ 8906{
7816 u64 rt_runtime, rt_period; 8907 int i, err = 0;
7817 int err = 0;
7818
7819 rt_period = (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
7820 rt_runtime = (u64)rt_runtime_us * NSEC_PER_USEC;
7821 if (rt_runtime_us == -1)
7822 rt_runtime = RUNTIME_INF;
7823 8908
7824 mutex_lock(&rt_constraints_mutex); 8909 mutex_lock(&rt_constraints_mutex);
7825 read_lock(&tasklist_lock); 8910 read_lock(&tasklist_lock);
7826 if (rt_runtime_us == 0 && tg_has_rt_tasks(tg)) { 8911 if (rt_runtime == 0 && tg_has_rt_tasks(tg)) {
7827 err = -EBUSY; 8912 err = -EBUSY;
7828 goto unlock; 8913 goto unlock;
7829 } 8914 }
@@ -7831,7 +8916,19 @@ int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us)
7831 err = -EINVAL; 8916 err = -EINVAL;
7832 goto unlock; 8917 goto unlock;
7833 } 8918 }
7834 tg->rt_runtime = rt_runtime; 8919
8920 spin_lock_irq(&tg->rt_bandwidth.rt_runtime_lock);
8921 tg->rt_bandwidth.rt_period = ns_to_ktime(rt_period);
8922 tg->rt_bandwidth.rt_runtime = rt_runtime;
8923
8924 for_each_possible_cpu(i) {
8925 struct rt_rq *rt_rq = tg->rt_rq[i];
8926
8927 spin_lock(&rt_rq->rt_runtime_lock);
8928 rt_rq->rt_runtime = rt_runtime;
8929 spin_unlock(&rt_rq->rt_runtime_lock);
8930 }
8931 spin_unlock_irq(&tg->rt_bandwidth.rt_runtime_lock);
7835 unlock: 8932 unlock:
7836 read_unlock(&tasklist_lock); 8933 read_unlock(&tasklist_lock);
7837 mutex_unlock(&rt_constraints_mutex); 8934 mutex_unlock(&rt_constraints_mutex);
@@ -7839,19 +8936,109 @@ int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us)
7839 return err; 8936 return err;
7840} 8937}
7841 8938
8939int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us)
8940{
8941 u64 rt_runtime, rt_period;
8942
8943 rt_period = ktime_to_ns(tg->rt_bandwidth.rt_period);
8944 rt_runtime = (u64)rt_runtime_us * NSEC_PER_USEC;
8945 if (rt_runtime_us < 0)
8946 rt_runtime = RUNTIME_INF;
8947
8948 return tg_set_bandwidth(tg, rt_period, rt_runtime);
8949}
8950
7842long sched_group_rt_runtime(struct task_group *tg) 8951long sched_group_rt_runtime(struct task_group *tg)
7843{ 8952{
7844 u64 rt_runtime_us; 8953 u64 rt_runtime_us;
7845 8954
7846 if (tg->rt_runtime == RUNTIME_INF) 8955 if (tg->rt_bandwidth.rt_runtime == RUNTIME_INF)
7847 return -1; 8956 return -1;
7848 8957
7849 rt_runtime_us = tg->rt_runtime; 8958 rt_runtime_us = tg->rt_bandwidth.rt_runtime;
7850 do_div(rt_runtime_us, NSEC_PER_USEC); 8959 do_div(rt_runtime_us, NSEC_PER_USEC);
7851 return rt_runtime_us; 8960 return rt_runtime_us;
7852} 8961}
8962
8963int sched_group_set_rt_period(struct task_group *tg, long rt_period_us)
8964{
8965 u64 rt_runtime, rt_period;
8966
8967 rt_period = (u64)rt_period_us * NSEC_PER_USEC;
8968 rt_runtime = tg->rt_bandwidth.rt_runtime;
8969
8970 return tg_set_bandwidth(tg, rt_period, rt_runtime);
8971}
8972
8973long sched_group_rt_period(struct task_group *tg)
8974{
8975 u64 rt_period_us;
8976
8977 rt_period_us = ktime_to_ns(tg->rt_bandwidth.rt_period);
8978 do_div(rt_period_us, NSEC_PER_USEC);
8979 return rt_period_us;
8980}
8981
8982static int sched_rt_global_constraints(void)
8983{
8984 int ret = 0;
8985
8986 mutex_lock(&rt_constraints_mutex);
8987 if (!__rt_schedulable(NULL, 1, 0))
8988 ret = -EINVAL;
8989 mutex_unlock(&rt_constraints_mutex);
8990
8991 return ret;
8992}
8993#else
8994static int sched_rt_global_constraints(void)
8995{
8996 unsigned long flags;
8997 int i;
8998
8999 spin_lock_irqsave(&def_rt_bandwidth.rt_runtime_lock, flags);
9000 for_each_possible_cpu(i) {
9001 struct rt_rq *rt_rq = &cpu_rq(i)->rt;
9002
9003 spin_lock(&rt_rq->rt_runtime_lock);
9004 rt_rq->rt_runtime = global_rt_runtime();
9005 spin_unlock(&rt_rq->rt_runtime_lock);
9006 }
9007 spin_unlock_irqrestore(&def_rt_bandwidth.rt_runtime_lock, flags);
9008
9009 return 0;
9010}
7853#endif 9011#endif
7854#endif /* CONFIG_GROUP_SCHED */ 9012
9013int sched_rt_handler(struct ctl_table *table, int write,
9014 struct file *filp, void __user *buffer, size_t *lenp,
9015 loff_t *ppos)
9016{
9017 int ret;
9018 int old_period, old_runtime;
9019 static DEFINE_MUTEX(mutex);
9020
9021 mutex_lock(&mutex);
9022 old_period = sysctl_sched_rt_period;
9023 old_runtime = sysctl_sched_rt_runtime;
9024
9025 ret = proc_dointvec(table, write, filp, buffer, lenp, ppos);
9026
9027 if (!ret && write) {
9028 ret = sched_rt_global_constraints();
9029 if (ret) {
9030 sysctl_sched_rt_period = old_period;
9031 sysctl_sched_rt_runtime = old_runtime;
9032 } else {
9033 def_rt_bandwidth.rt_runtime = global_rt_runtime();
9034 def_rt_bandwidth.rt_period =
9035 ns_to_ktime(global_rt_period());
9036 }
9037 }
9038 mutex_unlock(&mutex);
9039
9040 return ret;
9041}
7855 9042
7856#ifdef CONFIG_CGROUP_SCHED 9043#ifdef CONFIG_CGROUP_SCHED
7857 9044
@@ -7865,7 +9052,7 @@ static inline struct task_group *cgroup_tg(struct cgroup *cgrp)
7865static struct cgroup_subsys_state * 9052static struct cgroup_subsys_state *
7866cpu_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp) 9053cpu_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp)
7867{ 9054{
7868 struct task_group *tg; 9055 struct task_group *tg, *parent;
7869 9056
7870 if (!cgrp->parent) { 9057 if (!cgrp->parent) {
7871 /* This is early initialization for the top cgroup */ 9058 /* This is early initialization for the top cgroup */
@@ -7873,11 +9060,8 @@ cpu_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp)
7873 return &init_task_group.css; 9060 return &init_task_group.css;
7874 } 9061 }
7875 9062
7876 /* we support only 1-level deep hierarchical scheduler atm */ 9063 parent = cgroup_tg(cgrp->parent);
7877 if (cgrp->parent->parent) 9064 tg = sched_create_group(parent);
7878 return ERR_PTR(-EINVAL);
7879
7880 tg = sched_create_group();
7881 if (IS_ERR(tg)) 9065 if (IS_ERR(tg))
7882 return ERR_PTR(-ENOMEM); 9066 return ERR_PTR(-ENOMEM);
7883 9067
@@ -7901,7 +9085,7 @@ cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
7901{ 9085{
7902#ifdef CONFIG_RT_GROUP_SCHED 9086#ifdef CONFIG_RT_GROUP_SCHED
7903 /* Don't accept realtime tasks when there is no way for them to run */ 9087 /* Don't accept realtime tasks when there is no way for them to run */
7904 if (rt_task(tsk) && cgroup_tg(cgrp)->rt_runtime == 0) 9088 if (rt_task(tsk) && cgroup_tg(cgrp)->rt_bandwidth.rt_runtime == 0)
7905 return -EINVAL; 9089 return -EINVAL;
7906#else 9090#else
7907 /* We don't support RT-tasks being in separate groups */ 9091 /* We don't support RT-tasks being in separate groups */
@@ -7935,7 +9119,7 @@ static u64 cpu_shares_read_uint(struct cgroup *cgrp, struct cftype *cft)
7935#endif 9119#endif
7936 9120
7937#ifdef CONFIG_RT_GROUP_SCHED 9121#ifdef CONFIG_RT_GROUP_SCHED
7938static int cpu_rt_runtime_write(struct cgroup *cgrp, struct cftype *cft, 9122static ssize_t cpu_rt_runtime_write(struct cgroup *cgrp, struct cftype *cft,
7939 struct file *file, 9123 struct file *file,
7940 const char __user *userbuf, 9124 const char __user *userbuf,
7941 size_t nbytes, loff_t *unused_ppos) 9125 size_t nbytes, loff_t *unused_ppos)
@@ -7979,6 +9163,17 @@ static ssize_t cpu_rt_runtime_read(struct cgroup *cgrp, struct cftype *cft,
7979 9163
7980 return simple_read_from_buffer(buf, nbytes, ppos, tmp, len); 9164 return simple_read_from_buffer(buf, nbytes, ppos, tmp, len);
7981} 9165}
9166
9167static int cpu_rt_period_write_uint(struct cgroup *cgrp, struct cftype *cftype,
9168 u64 rt_period_us)
9169{
9170 return sched_group_set_rt_period(cgroup_tg(cgrp), rt_period_us);
9171}
9172
9173static u64 cpu_rt_period_read_uint(struct cgroup *cgrp, struct cftype *cft)
9174{
9175 return sched_group_rt_period(cgroup_tg(cgrp));
9176}
7982#endif 9177#endif
7983 9178
7984static struct cftype cpu_files[] = { 9179static struct cftype cpu_files[] = {
@@ -7995,6 +9190,11 @@ static struct cftype cpu_files[] = {
7995 .read = cpu_rt_runtime_read, 9190 .read = cpu_rt_runtime_read,
7996 .write = cpu_rt_runtime_write, 9191 .write = cpu_rt_runtime_write,
7997 }, 9192 },
9193 {
9194 .name = "rt_period_us",
9195 .read_uint = cpu_rt_period_read_uint,
9196 .write_uint = cpu_rt_period_write_uint,
9197 },
7998#endif 9198#endif
7999}; 9199};
8000 9200
@@ -8035,9 +9235,9 @@ struct cpuacct {
8035struct cgroup_subsys cpuacct_subsys; 9235struct cgroup_subsys cpuacct_subsys;
8036 9236
8037/* return cpu accounting group corresponding to this container */ 9237/* return cpu accounting group corresponding to this container */
8038static inline struct cpuacct *cgroup_ca(struct cgroup *cont) 9238static inline struct cpuacct *cgroup_ca(struct cgroup *cgrp)
8039{ 9239{
8040 return container_of(cgroup_subsys_state(cont, cpuacct_subsys_id), 9240 return container_of(cgroup_subsys_state(cgrp, cpuacct_subsys_id),
8041 struct cpuacct, css); 9241 struct cpuacct, css);
8042} 9242}
8043 9243
@@ -8050,7 +9250,7 @@ static inline struct cpuacct *task_ca(struct task_struct *tsk)
8050 9250
8051/* create a new cpu accounting group */ 9251/* create a new cpu accounting group */
8052static struct cgroup_subsys_state *cpuacct_create( 9252static struct cgroup_subsys_state *cpuacct_create(
8053 struct cgroup_subsys *ss, struct cgroup *cont) 9253 struct cgroup_subsys *ss, struct cgroup *cgrp)
8054{ 9254{
8055 struct cpuacct *ca = kzalloc(sizeof(*ca), GFP_KERNEL); 9255 struct cpuacct *ca = kzalloc(sizeof(*ca), GFP_KERNEL);
8056 9256
@@ -8068,18 +9268,18 @@ static struct cgroup_subsys_state *cpuacct_create(
8068 9268
8069/* destroy an existing cpu accounting group */ 9269/* destroy an existing cpu accounting group */
8070static void 9270static void
8071cpuacct_destroy(struct cgroup_subsys *ss, struct cgroup *cont) 9271cpuacct_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
8072{ 9272{
8073 struct cpuacct *ca = cgroup_ca(cont); 9273 struct cpuacct *ca = cgroup_ca(cgrp);
8074 9274
8075 free_percpu(ca->cpuusage); 9275 free_percpu(ca->cpuusage);
8076 kfree(ca); 9276 kfree(ca);
8077} 9277}
8078 9278
8079/* return total cpu usage (in nanoseconds) of a group */ 9279/* return total cpu usage (in nanoseconds) of a group */
8080static u64 cpuusage_read(struct cgroup *cont, struct cftype *cft) 9280static u64 cpuusage_read(struct cgroup *cgrp, struct cftype *cft)
8081{ 9281{
8082 struct cpuacct *ca = cgroup_ca(cont); 9282 struct cpuacct *ca = cgroup_ca(cgrp);
8083 u64 totalcpuusage = 0; 9283 u64 totalcpuusage = 0;
8084 int i; 9284 int i;
8085 9285
@@ -8098,16 +9298,40 @@ static u64 cpuusage_read(struct cgroup *cont, struct cftype *cft)
8098 return totalcpuusage; 9298 return totalcpuusage;
8099} 9299}
8100 9300
9301static int cpuusage_write(struct cgroup *cgrp, struct cftype *cftype,
9302 u64 reset)
9303{
9304 struct cpuacct *ca = cgroup_ca(cgrp);
9305 int err = 0;
9306 int i;
9307
9308 if (reset) {
9309 err = -EINVAL;
9310 goto out;
9311 }
9312
9313 for_each_possible_cpu(i) {
9314 u64 *cpuusage = percpu_ptr(ca->cpuusage, i);
9315
9316 spin_lock_irq(&cpu_rq(i)->lock);
9317 *cpuusage = 0;
9318 spin_unlock_irq(&cpu_rq(i)->lock);
9319 }
9320out:
9321 return err;
9322}
9323
8101static struct cftype files[] = { 9324static struct cftype files[] = {
8102 { 9325 {
8103 .name = "usage", 9326 .name = "usage",
8104 .read_uint = cpuusage_read, 9327 .read_uint = cpuusage_read,
9328 .write_uint = cpuusage_write,
8105 }, 9329 },
8106}; 9330};
8107 9331
8108static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cont) 9332static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
8109{ 9333{
8110 return cgroup_add_files(cont, ss, files, ARRAY_SIZE(files)); 9334 return cgroup_add_files(cgrp, ss, files, ARRAY_SIZE(files));
8111} 9335}
8112 9336
8113/* 9337/*
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index ef358ba07683..f3f4af4b8b0f 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -67,14 +67,24 @@ print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
67 (long long)(p->nvcsw + p->nivcsw), 67 (long long)(p->nvcsw + p->nivcsw),
68 p->prio); 68 p->prio);
69#ifdef CONFIG_SCHEDSTATS 69#ifdef CONFIG_SCHEDSTATS
70 SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld\n", 70 SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
71 SPLIT_NS(p->se.vruntime), 71 SPLIT_NS(p->se.vruntime),
72 SPLIT_NS(p->se.sum_exec_runtime), 72 SPLIT_NS(p->se.sum_exec_runtime),
73 SPLIT_NS(p->se.sum_sleep_runtime)); 73 SPLIT_NS(p->se.sum_sleep_runtime));
74#else 74#else
75 SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld\n", 75 SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld",
76 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L); 76 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);
77#endif 77#endif
78
79#ifdef CONFIG_CGROUP_SCHED
80 {
81 char path[64];
82
83 cgroup_path(task_group(p)->css.cgroup, path, sizeof(path));
84 SEQ_printf(m, " %s", path);
85 }
86#endif
87 SEQ_printf(m, "\n");
78} 88}
79 89
80static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) 90static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
@@ -109,7 +119,21 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
109 struct sched_entity *last; 119 struct sched_entity *last;
110 unsigned long flags; 120 unsigned long flags;
111 121
112 SEQ_printf(m, "\ncfs_rq\n"); 122#if !defined(CONFIG_CGROUP_SCHED) || !defined(CONFIG_USER_SCHED)
123 SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
124#else
125 char path[128] = "";
126 struct cgroup *cgroup = NULL;
127 struct task_group *tg = cfs_rq->tg;
128
129 if (tg)
130 cgroup = tg->css.cgroup;
131
132 if (cgroup)
133 cgroup_path(cgroup, path, sizeof(path));
134
135 SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path);
136#endif
113 137
114 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock", 138 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
115 SPLIT_NS(cfs_rq->exec_clock)); 139 SPLIT_NS(cfs_rq->exec_clock));
@@ -143,6 +167,11 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
143#endif 167#endif
144 SEQ_printf(m, " .%-30s: %ld\n", "nr_spread_over", 168 SEQ_printf(m, " .%-30s: %ld\n", "nr_spread_over",
145 cfs_rq->nr_spread_over); 169 cfs_rq->nr_spread_over);
170#ifdef CONFIG_FAIR_GROUP_SCHED
171#ifdef CONFIG_SMP
172 SEQ_printf(m, " .%-30s: %lu\n", "shares", cfs_rq->shares);
173#endif
174#endif
146} 175}
147 176
148static void print_cpu(struct seq_file *m, int cpu) 177static void print_cpu(struct seq_file *m, int cpu)
@@ -214,7 +243,6 @@ static int sched_debug_show(struct seq_file *m, void *v)
214 PN(sysctl_sched_latency); 243 PN(sysctl_sched_latency);
215 PN(sysctl_sched_min_granularity); 244 PN(sysctl_sched_min_granularity);
216 PN(sysctl_sched_wakeup_granularity); 245 PN(sysctl_sched_wakeup_granularity);
217 PN(sysctl_sched_batch_wakeup_granularity);
218 PN(sysctl_sched_child_runs_first); 246 PN(sysctl_sched_child_runs_first);
219 P(sysctl_sched_features); 247 P(sysctl_sched_features);
220#undef PN 248#undef PN
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 0080968d3e4a..89fa32b4edf2 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -62,24 +62,14 @@ const_debug unsigned int sysctl_sched_child_runs_first = 1;
62unsigned int __read_mostly sysctl_sched_compat_yield; 62unsigned int __read_mostly sysctl_sched_compat_yield;
63 63
64/* 64/*
65 * SCHED_BATCH wake-up granularity.
66 * (default: 10 msec * (1 + ilog(ncpus)), units: nanoseconds)
67 *
68 * This option delays the preemption effects of decoupled workloads
69 * and reduces their over-scheduling. Synchronous workloads will still
70 * have immediate wakeup/sleep latencies.
71 */
72unsigned int sysctl_sched_batch_wakeup_granularity = 10000000UL;
73
74/*
75 * SCHED_OTHER wake-up granularity. 65 * SCHED_OTHER wake-up granularity.
76 * (default: 5 msec * (1 + ilog(ncpus)), units: nanoseconds) 66 * (default: 10 msec * (1 + ilog(ncpus)), units: nanoseconds)
77 * 67 *
78 * This option delays the preemption effects of decoupled workloads 68 * This option delays the preemption effects of decoupled workloads
79 * and reduces their over-scheduling. Synchronous workloads will still 69 * and reduces their over-scheduling. Synchronous workloads will still
80 * have immediate wakeup/sleep latencies. 70 * have immediate wakeup/sleep latencies.
81 */ 71 */
82unsigned int sysctl_sched_wakeup_granularity = 5000000UL; 72unsigned int sysctl_sched_wakeup_granularity = 10000000UL;
83 73
84const_debug unsigned int sysctl_sched_migration_cost = 500000UL; 74const_debug unsigned int sysctl_sched_migration_cost = 500000UL;
85 75
@@ -87,6 +77,11 @@ const_debug unsigned int sysctl_sched_migration_cost = 500000UL;
87 * CFS operations on generic schedulable entities: 77 * CFS operations on generic schedulable entities:
88 */ 78 */
89 79
80static inline struct task_struct *task_of(struct sched_entity *se)
81{
82 return container_of(se, struct task_struct, se);
83}
84
90#ifdef CONFIG_FAIR_GROUP_SCHED 85#ifdef CONFIG_FAIR_GROUP_SCHED
91 86
92/* cpu runqueue to which this cfs_rq is attached */ 87/* cpu runqueue to which this cfs_rq is attached */
@@ -98,6 +93,54 @@ static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
98/* An entity is a task if it doesn't "own" a runqueue */ 93/* An entity is a task if it doesn't "own" a runqueue */
99#define entity_is_task(se) (!se->my_q) 94#define entity_is_task(se) (!se->my_q)
100 95
96/* Walk up scheduling entities hierarchy */
97#define for_each_sched_entity(se) \
98 for (; se; se = se->parent)
99
100static inline struct cfs_rq *task_cfs_rq(struct task_struct *p)
101{
102 return p->se.cfs_rq;
103}
104
105/* runqueue on which this entity is (to be) queued */
106static inline struct cfs_rq *cfs_rq_of(struct sched_entity *se)
107{
108 return se->cfs_rq;
109}
110
111/* runqueue "owned" by this group */
112static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
113{
114 return grp->my_q;
115}
116
117/* Given a group's cfs_rq on one cpu, return its corresponding cfs_rq on
118 * another cpu ('this_cpu')
119 */
120static inline struct cfs_rq *cpu_cfs_rq(struct cfs_rq *cfs_rq, int this_cpu)
121{
122 return cfs_rq->tg->cfs_rq[this_cpu];
123}
124
125/* Iterate thr' all leaf cfs_rq's on a runqueue */
126#define for_each_leaf_cfs_rq(rq, cfs_rq) \
127 list_for_each_entry_rcu(cfs_rq, &rq->leaf_cfs_rq_list, leaf_cfs_rq_list)
128
129/* Do the two (enqueued) entities belong to the same group ? */
130static inline int
131is_same_group(struct sched_entity *se, struct sched_entity *pse)
132{
133 if (se->cfs_rq == pse->cfs_rq)
134 return 1;
135
136 return 0;
137}
138
139static inline struct sched_entity *parent_entity(struct sched_entity *se)
140{
141 return se->parent;
142}
143
101#else /* CONFIG_FAIR_GROUP_SCHED */ 144#else /* CONFIG_FAIR_GROUP_SCHED */
102 145
103static inline struct rq *rq_of(struct cfs_rq *cfs_rq) 146static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
@@ -107,13 +150,49 @@ static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
107 150
108#define entity_is_task(se) 1 151#define entity_is_task(se) 1
109 152
110#endif /* CONFIG_FAIR_GROUP_SCHED */ 153#define for_each_sched_entity(se) \
154 for (; se; se = NULL)
111 155
112static inline struct task_struct *task_of(struct sched_entity *se) 156static inline struct cfs_rq *task_cfs_rq(struct task_struct *p)
113{ 157{
114 return container_of(se, struct task_struct, se); 158 return &task_rq(p)->cfs;
159}
160
161static inline struct cfs_rq *cfs_rq_of(struct sched_entity *se)
162{
163 struct task_struct *p = task_of(se);
164 struct rq *rq = task_rq(p);
165
166 return &rq->cfs;
167}
168
169/* runqueue "owned" by this group */
170static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
171{
172 return NULL;
173}
174
175static inline struct cfs_rq *cpu_cfs_rq(struct cfs_rq *cfs_rq, int this_cpu)
176{
177 return &cpu_rq(this_cpu)->cfs;
178}
179
180#define for_each_leaf_cfs_rq(rq, cfs_rq) \
181 for (cfs_rq = &rq->cfs; cfs_rq; cfs_rq = NULL)
182
183static inline int
184is_same_group(struct sched_entity *se, struct sched_entity *pse)
185{
186 return 1;
187}
188
189static inline struct sched_entity *parent_entity(struct sched_entity *se)
190{
191 return NULL;
115} 192}
116 193
194#endif /* CONFIG_FAIR_GROUP_SCHED */
195
117 196
118/************************************************************** 197/**************************************************************
119 * Scheduling class tree data structure manipulation methods: 198 * Scheduling class tree data structure manipulation methods:
@@ -255,6 +334,34 @@ int sched_nr_latency_handler(struct ctl_table *table, int write,
255#endif 334#endif
256 335
257/* 336/*
337 * delta *= w / rw
338 */
339static inline unsigned long
340calc_delta_weight(unsigned long delta, struct sched_entity *se)
341{
342 for_each_sched_entity(se) {
343 delta = calc_delta_mine(delta,
344 se->load.weight, &cfs_rq_of(se)->load);
345 }
346
347 return delta;
348}
349
350/*
351 * delta *= rw / w
352 */
353static inline unsigned long
354calc_delta_fair(unsigned long delta, struct sched_entity *se)
355{
356 for_each_sched_entity(se) {
357 delta = calc_delta_mine(delta,
358 cfs_rq_of(se)->load.weight, &se->load);
359 }
360
361 return delta;
362}
363
364/*
258 * The idea is to set a period in which each task runs once. 365 * The idea is to set a period in which each task runs once.
259 * 366 *
260 * When there are too many tasks (sysctl_sched_nr_latency) we have to stretch 367 * When there are too many tasks (sysctl_sched_nr_latency) we have to stretch
@@ -283,29 +390,54 @@ static u64 __sched_period(unsigned long nr_running)
283 */ 390 */
284static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se) 391static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se)
285{ 392{
286 return calc_delta_mine(__sched_period(cfs_rq->nr_running), 393 return calc_delta_weight(__sched_period(cfs_rq->nr_running), se);
287 se->load.weight, &cfs_rq->load);
288} 394}
289 395
290/* 396/*
291 * We calculate the vruntime slice. 397 * We calculate the vruntime slice of a to be inserted task
292 * 398 *
293 * vs = s/w = p/rw 399 * vs = s*rw/w = p
294 */ 400 */
295static u64 __sched_vslice(unsigned long rq_weight, unsigned long nr_running) 401static u64 sched_vslice_add(struct cfs_rq *cfs_rq, struct sched_entity *se)
296{ 402{
297 u64 vslice = __sched_period(nr_running); 403 unsigned long nr_running = cfs_rq->nr_running;
298 404
299 vslice *= NICE_0_LOAD; 405 if (!se->on_rq)
300 do_div(vslice, rq_weight); 406 nr_running++;
301 407
302 return vslice; 408 return __sched_period(nr_running);
303} 409}
304 410
305static u64 sched_vslice_add(struct cfs_rq *cfs_rq, struct sched_entity *se) 411/*
412 * The goal of calc_delta_asym() is to be asymmetrically around NICE_0_LOAD, in
413 * that it favours >=0 over <0.
414 *
415 * -20 |
416 * |
417 * 0 --------+-------
418 * .'
419 * 19 .'
420 *
421 */
422static unsigned long
423calc_delta_asym(unsigned long delta, struct sched_entity *se)
306{ 424{
307 return __sched_vslice(cfs_rq->load.weight + se->load.weight, 425 struct load_weight lw = {
308 cfs_rq->nr_running + 1); 426 .weight = NICE_0_LOAD,
427 .inv_weight = 1UL << (WMULT_SHIFT-NICE_0_SHIFT)
428 };
429
430 for_each_sched_entity(se) {
431 struct load_weight *se_lw = &se->load;
432
433 if (se->load.weight < NICE_0_LOAD)
434 se_lw = &lw;
435
436 delta = calc_delta_mine(delta,
437 cfs_rq_of(se)->load.weight, se_lw);
438 }
439
440 return delta;
309} 441}
310 442
311/* 443/*
@@ -322,11 +454,7 @@ __update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr,
322 454
323 curr->sum_exec_runtime += delta_exec; 455 curr->sum_exec_runtime += delta_exec;
324 schedstat_add(cfs_rq, exec_clock, delta_exec); 456 schedstat_add(cfs_rq, exec_clock, delta_exec);
325 delta_exec_weighted = delta_exec; 457 delta_exec_weighted = calc_delta_fair(delta_exec, curr);
326 if (unlikely(curr->load.weight != NICE_0_LOAD)) {
327 delta_exec_weighted = calc_delta_fair(delta_exec_weighted,
328 &curr->load);
329 }
330 curr->vruntime += delta_exec_weighted; 458 curr->vruntime += delta_exec_weighted;
331} 459}
332 460
@@ -413,20 +541,43 @@ update_stats_curr_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
413 * Scheduling class queueing methods: 541 * Scheduling class queueing methods:
414 */ 542 */
415 543
544#if defined CONFIG_SMP && defined CONFIG_FAIR_GROUP_SCHED
545static void
546add_cfs_task_weight(struct cfs_rq *cfs_rq, unsigned long weight)
547{
548 cfs_rq->task_weight += weight;
549}
550#else
551static inline void
552add_cfs_task_weight(struct cfs_rq *cfs_rq, unsigned long weight)
553{
554}
555#endif
556
416static void 557static void
417account_entity_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se) 558account_entity_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se)
418{ 559{
419 update_load_add(&cfs_rq->load, se->load.weight); 560 update_load_add(&cfs_rq->load, se->load.weight);
561 if (!parent_entity(se))
562 inc_cpu_load(rq_of(cfs_rq), se->load.weight);
563 if (entity_is_task(se))
564 add_cfs_task_weight(cfs_rq, se->load.weight);
420 cfs_rq->nr_running++; 565 cfs_rq->nr_running++;
421 se->on_rq = 1; 566 se->on_rq = 1;
567 list_add(&se->group_node, &cfs_rq->tasks);
422} 568}
423 569
424static void 570static void
425account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se) 571account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
426{ 572{
427 update_load_sub(&cfs_rq->load, se->load.weight); 573 update_load_sub(&cfs_rq->load, se->load.weight);
574 if (!parent_entity(se))
575 dec_cpu_load(rq_of(cfs_rq), se->load.weight);
576 if (entity_is_task(se))
577 add_cfs_task_weight(cfs_rq, -se->load.weight);
428 cfs_rq->nr_running--; 578 cfs_rq->nr_running--;
429 se->on_rq = 0; 579 se->on_rq = 0;
580 list_del_init(&se->group_node);
430} 581}
431 582
432static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se) 583static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
@@ -510,8 +661,12 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
510 661
511 if (!initial) { 662 if (!initial) {
512 /* sleeps upto a single latency don't count. */ 663 /* sleeps upto a single latency don't count. */
513 if (sched_feat(NEW_FAIR_SLEEPERS)) 664 if (sched_feat(NEW_FAIR_SLEEPERS)) {
514 vruntime -= sysctl_sched_latency; 665 if (sched_feat(NORMALIZED_SLEEPER))
666 vruntime -= calc_delta_weight(sysctl_sched_latency, se);
667 else
668 vruntime -= sysctl_sched_latency;
669 }
515 670
516 /* ensure we never gain time by being placed backwards. */ 671 /* ensure we never gain time by being placed backwards. */
517 vruntime = max_vruntime(se->vruntime, vruntime); 672 vruntime = max_vruntime(se->vruntime, vruntime);
@@ -627,20 +782,16 @@ set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
627 se->prev_sum_exec_runtime = se->sum_exec_runtime; 782 se->prev_sum_exec_runtime = se->sum_exec_runtime;
628} 783}
629 784
785static int
786wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se);
787
630static struct sched_entity * 788static struct sched_entity *
631pick_next(struct cfs_rq *cfs_rq, struct sched_entity *se) 789pick_next(struct cfs_rq *cfs_rq, struct sched_entity *se)
632{ 790{
633 s64 diff, gran;
634
635 if (!cfs_rq->next) 791 if (!cfs_rq->next)
636 return se; 792 return se;
637 793
638 diff = cfs_rq->next->vruntime - se->vruntime; 794 if (wakeup_preempt_entity(cfs_rq->next, se) != 0)
639 if (diff < 0)
640 return se;
641
642 gran = calc_delta_fair(sysctl_sched_wakeup_granularity, &cfs_rq->load);
643 if (diff > gran)
644 return se; 795 return se;
645 796
646 return cfs_rq->next; 797 return cfs_rq->next;
@@ -708,101 +859,6 @@ entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr, int queued)
708 * CFS operations on tasks: 859 * CFS operations on tasks:
709 */ 860 */
710 861
711#ifdef CONFIG_FAIR_GROUP_SCHED
712
713/* Walk up scheduling entities hierarchy */
714#define for_each_sched_entity(se) \
715 for (; se; se = se->parent)
716
717static inline struct cfs_rq *task_cfs_rq(struct task_struct *p)
718{
719 return p->se.cfs_rq;
720}
721
722/* runqueue on which this entity is (to be) queued */
723static inline struct cfs_rq *cfs_rq_of(struct sched_entity *se)
724{
725 return se->cfs_rq;
726}
727
728/* runqueue "owned" by this group */
729static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
730{
731 return grp->my_q;
732}
733
734/* Given a group's cfs_rq on one cpu, return its corresponding cfs_rq on
735 * another cpu ('this_cpu')
736 */
737static inline struct cfs_rq *cpu_cfs_rq(struct cfs_rq *cfs_rq, int this_cpu)
738{
739 return cfs_rq->tg->cfs_rq[this_cpu];
740}
741
742/* Iterate thr' all leaf cfs_rq's on a runqueue */
743#define for_each_leaf_cfs_rq(rq, cfs_rq) \
744 list_for_each_entry_rcu(cfs_rq, &rq->leaf_cfs_rq_list, leaf_cfs_rq_list)
745
746/* Do the two (enqueued) entities belong to the same group ? */
747static inline int
748is_same_group(struct sched_entity *se, struct sched_entity *pse)
749{
750 if (se->cfs_rq == pse->cfs_rq)
751 return 1;
752
753 return 0;
754}
755
756static inline struct sched_entity *parent_entity(struct sched_entity *se)
757{
758 return se->parent;
759}
760
761#else /* CONFIG_FAIR_GROUP_SCHED */
762
763#define for_each_sched_entity(se) \
764 for (; se; se = NULL)
765
766static inline struct cfs_rq *task_cfs_rq(struct task_struct *p)
767{
768 return &task_rq(p)->cfs;
769}
770
771static inline struct cfs_rq *cfs_rq_of(struct sched_entity *se)
772{
773 struct task_struct *p = task_of(se);
774 struct rq *rq = task_rq(p);
775
776 return &rq->cfs;
777}
778
779/* runqueue "owned" by this group */
780static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
781{
782 return NULL;
783}
784
785static inline struct cfs_rq *cpu_cfs_rq(struct cfs_rq *cfs_rq, int this_cpu)
786{
787 return &cpu_rq(this_cpu)->cfs;
788}
789
790#define for_each_leaf_cfs_rq(rq, cfs_rq) \
791 for (cfs_rq = &rq->cfs; cfs_rq; cfs_rq = NULL)
792
793static inline int
794is_same_group(struct sched_entity *se, struct sched_entity *pse)
795{
796 return 1;
797}
798
799static inline struct sched_entity *parent_entity(struct sched_entity *se)
800{
801 return NULL;
802}
803
804#endif /* CONFIG_FAIR_GROUP_SCHED */
805
806#ifdef CONFIG_SCHED_HRTICK 862#ifdef CONFIG_SCHED_HRTICK
807static void hrtick_start_fair(struct rq *rq, struct task_struct *p) 863static void hrtick_start_fair(struct rq *rq, struct task_struct *p)
808{ 864{
@@ -916,7 +972,7 @@ static void yield_task_fair(struct rq *rq)
916 /* 972 /*
917 * Already in the rightmost position? 973 * Already in the rightmost position?
918 */ 974 */
919 if (unlikely(rightmost->vruntime < se->vruntime)) 975 if (unlikely(!rightmost || rightmost->vruntime < se->vruntime))
920 return; 976 return;
921 977
922 /* 978 /*
@@ -955,7 +1011,9 @@ static int wake_idle(int cpu, struct task_struct *p)
955 return cpu; 1011 return cpu;
956 1012
957 for_each_domain(cpu, sd) { 1013 for_each_domain(cpu, sd) {
958 if (sd->flags & SD_WAKE_IDLE) { 1014 if ((sd->flags & SD_WAKE_IDLE)
1015 || ((sd->flags & SD_WAKE_IDLE_FAR)
1016 && !task_hot(p, task_rq(p)->clock, sd))) {
959 cpus_and(tmp, sd->span, p->cpus_allowed); 1017 cpus_and(tmp, sd->span, p->cpus_allowed);
960 for_each_cpu_mask(i, tmp) { 1018 for_each_cpu_mask(i, tmp) {
961 if (idle_cpu(i)) { 1019 if (idle_cpu(i)) {
@@ -1099,6 +1157,58 @@ out:
1099} 1157}
1100#endif /* CONFIG_SMP */ 1158#endif /* CONFIG_SMP */
1101 1159
1160static unsigned long wakeup_gran(struct sched_entity *se)
1161{
1162 unsigned long gran = sysctl_sched_wakeup_granularity;
1163
1164 /*
1165 * More easily preempt - nice tasks, while not making it harder for
1166 * + nice tasks.
1167 */
1168 gran = calc_delta_asym(sysctl_sched_wakeup_granularity, se);
1169
1170 return gran;
1171}
1172
1173/*
1174 * Should 'se' preempt 'curr'.
1175 *
1176 * |s1
1177 * |s2
1178 * |s3
1179 * g
1180 * |<--->|c
1181 *
1182 * w(c, s1) = -1
1183 * w(c, s2) = 0
1184 * w(c, s3) = 1
1185 *
1186 */
1187static int
1188wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se)
1189{
1190 s64 gran, vdiff = curr->vruntime - se->vruntime;
1191
1192 if (vdiff < 0)
1193 return -1;
1194
1195 gran = wakeup_gran(curr);
1196 if (vdiff > gran)
1197 return 1;
1198
1199 return 0;
1200}
1201
1202/* return depth at which a sched entity is present in the hierarchy */
1203static inline int depth_se(struct sched_entity *se)
1204{
1205 int depth = 0;
1206
1207 for_each_sched_entity(se)
1208 depth++;
1209
1210 return depth;
1211}
1102 1212
1103/* 1213/*
1104 * Preempt the current task with a newly woken task if needed: 1214 * Preempt the current task with a newly woken task if needed:
@@ -1108,7 +1218,7 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
1108 struct task_struct *curr = rq->curr; 1218 struct task_struct *curr = rq->curr;
1109 struct cfs_rq *cfs_rq = task_cfs_rq(curr); 1219 struct cfs_rq *cfs_rq = task_cfs_rq(curr);
1110 struct sched_entity *se = &curr->se, *pse = &p->se; 1220 struct sched_entity *se = &curr->se, *pse = &p->se;
1111 unsigned long gran; 1221 int se_depth, pse_depth;
1112 1222
1113 if (unlikely(rt_prio(p->prio))) { 1223 if (unlikely(rt_prio(p->prio))) {
1114 update_rq_clock(rq); 1224 update_rq_clock(rq);
@@ -1133,20 +1243,33 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
1133 if (!sched_feat(WAKEUP_PREEMPT)) 1243 if (!sched_feat(WAKEUP_PREEMPT))
1134 return; 1244 return;
1135 1245
1136 while (!is_same_group(se, pse)) { 1246 /*
1247 * preemption test can be made between sibling entities who are in the
1248 * same cfs_rq i.e who have a common parent. Walk up the hierarchy of
1249 * both tasks until we find their ancestors who are siblings of common
1250 * parent.
1251 */
1252
1253 /* First walk up until both entities are at same depth */
1254 se_depth = depth_se(se);
1255 pse_depth = depth_se(pse);
1256
1257 while (se_depth > pse_depth) {
1258 se_depth--;
1137 se = parent_entity(se); 1259 se = parent_entity(se);
1260 }
1261
1262 while (pse_depth > se_depth) {
1263 pse_depth--;
1138 pse = parent_entity(pse); 1264 pse = parent_entity(pse);
1139 } 1265 }
1140 1266
1141 gran = sysctl_sched_wakeup_granularity; 1267 while (!is_same_group(se, pse)) {
1142 /* 1268 se = parent_entity(se);
1143 * More easily preempt - nice tasks, while not making 1269 pse = parent_entity(pse);
1144 * it harder for + nice tasks. 1270 }
1145 */
1146 if (unlikely(se->load.weight > NICE_0_LOAD))
1147 gran = calc_delta_fair(gran, &se->load);
1148 1271
1149 if (pse->vruntime + gran < se->vruntime) 1272 if (wakeup_preempt_entity(se, pse) == 1)
1150 resched_task(curr); 1273 resched_task(curr);
1151} 1274}
1152 1275
@@ -1197,15 +1320,27 @@ static void put_prev_task_fair(struct rq *rq, struct task_struct *prev)
1197 * the current task: 1320 * the current task:
1198 */ 1321 */
1199static struct task_struct * 1322static struct task_struct *
1200__load_balance_iterator(struct cfs_rq *cfs_rq, struct rb_node *curr) 1323__load_balance_iterator(struct cfs_rq *cfs_rq, struct list_head *next)
1201{ 1324{
1202 struct task_struct *p; 1325 struct task_struct *p = NULL;
1326 struct sched_entity *se;
1327
1328 if (next == &cfs_rq->tasks)
1329 return NULL;
1330
1331 /* Skip over entities that are not tasks */
1332 do {
1333 se = list_entry(next, struct sched_entity, group_node);
1334 next = next->next;
1335 } while (next != &cfs_rq->tasks && !entity_is_task(se));
1203 1336
1204 if (!curr) 1337 if (next == &cfs_rq->tasks)
1205 return NULL; 1338 return NULL;
1206 1339
1207 p = rb_entry(curr, struct task_struct, se.run_node); 1340 cfs_rq->balance_iterator = next;
1208 cfs_rq->rb_load_balance_curr = rb_next(curr); 1341
1342 if (entity_is_task(se))
1343 p = task_of(se);
1209 1344
1210 return p; 1345 return p;
1211} 1346}
@@ -1214,85 +1349,100 @@ static struct task_struct *load_balance_start_fair(void *arg)
1214{ 1349{
1215 struct cfs_rq *cfs_rq = arg; 1350 struct cfs_rq *cfs_rq = arg;
1216 1351
1217 return __load_balance_iterator(cfs_rq, first_fair(cfs_rq)); 1352 return __load_balance_iterator(cfs_rq, cfs_rq->tasks.next);
1218} 1353}
1219 1354
1220static struct task_struct *load_balance_next_fair(void *arg) 1355static struct task_struct *load_balance_next_fair(void *arg)
1221{ 1356{
1222 struct cfs_rq *cfs_rq = arg; 1357 struct cfs_rq *cfs_rq = arg;
1223 1358
1224 return __load_balance_iterator(cfs_rq, cfs_rq->rb_load_balance_curr); 1359 return __load_balance_iterator(cfs_rq, cfs_rq->balance_iterator);
1225} 1360}
1226 1361
1227#ifdef CONFIG_FAIR_GROUP_SCHED 1362static unsigned long
1228static int cfs_rq_best_prio(struct cfs_rq *cfs_rq) 1363__load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
1364 unsigned long max_load_move, struct sched_domain *sd,
1365 enum cpu_idle_type idle, int *all_pinned, int *this_best_prio,
1366 struct cfs_rq *cfs_rq)
1229{ 1367{
1230 struct sched_entity *curr; 1368 struct rq_iterator cfs_rq_iterator;
1231 struct task_struct *p;
1232
1233 if (!cfs_rq->nr_running || !first_fair(cfs_rq))
1234 return MAX_PRIO;
1235
1236 curr = cfs_rq->curr;
1237 if (!curr)
1238 curr = __pick_next_entity(cfs_rq);
1239 1369
1240 p = task_of(curr); 1370 cfs_rq_iterator.start = load_balance_start_fair;
1371 cfs_rq_iterator.next = load_balance_next_fair;
1372 cfs_rq_iterator.arg = cfs_rq;
1241 1373
1242 return p->prio; 1374 return balance_tasks(this_rq, this_cpu, busiest,
1375 max_load_move, sd, idle, all_pinned,
1376 this_best_prio, &cfs_rq_iterator);
1243} 1377}
1244#endif
1245 1378
1379#ifdef CONFIG_FAIR_GROUP_SCHED
1246static unsigned long 1380static unsigned long
1247load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest, 1381load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
1248 unsigned long max_load_move, 1382 unsigned long max_load_move,
1249 struct sched_domain *sd, enum cpu_idle_type idle, 1383 struct sched_domain *sd, enum cpu_idle_type idle,
1250 int *all_pinned, int *this_best_prio) 1384 int *all_pinned, int *this_best_prio)
1251{ 1385{
1252 struct cfs_rq *busy_cfs_rq;
1253 long rem_load_move = max_load_move; 1386 long rem_load_move = max_load_move;
1254 struct rq_iterator cfs_rq_iterator; 1387 int busiest_cpu = cpu_of(busiest);
1255 1388 struct task_group *tg;
1256 cfs_rq_iterator.start = load_balance_start_fair;
1257 cfs_rq_iterator.next = load_balance_next_fair;
1258 1389
1259 for_each_leaf_cfs_rq(busiest, busy_cfs_rq) { 1390 rcu_read_lock();
1260#ifdef CONFIG_FAIR_GROUP_SCHED 1391 list_for_each_entry(tg, &task_groups, list) {
1261 struct cfs_rq *this_cfs_rq;
1262 long imbalance; 1392 long imbalance;
1263 unsigned long maxload; 1393 unsigned long this_weight, busiest_weight;
1394 long rem_load, max_load, moved_load;
1395
1396 /*
1397 * empty group
1398 */
1399 if (!aggregate(tg, sd)->task_weight)
1400 continue;
1401
1402 rem_load = rem_load_move * aggregate(tg, sd)->rq_weight;
1403 rem_load /= aggregate(tg, sd)->load + 1;
1404
1405 this_weight = tg->cfs_rq[this_cpu]->task_weight;
1406 busiest_weight = tg->cfs_rq[busiest_cpu]->task_weight;
1407
1408 imbalance = (busiest_weight - this_weight) / 2;
1264 1409
1265 this_cfs_rq = cpu_cfs_rq(busy_cfs_rq, this_cpu); 1410 if (imbalance < 0)
1411 imbalance = busiest_weight;
1266 1412
1267 imbalance = busy_cfs_rq->load.weight - this_cfs_rq->load.weight; 1413 max_load = max(rem_load, imbalance);
1268 /* Don't pull if this_cfs_rq has more load than busy_cfs_rq */ 1414 moved_load = __load_balance_fair(this_rq, this_cpu, busiest,
1269 if (imbalance <= 0) 1415 max_load, sd, idle, all_pinned, this_best_prio,
1416 tg->cfs_rq[busiest_cpu]);
1417
1418 if (!moved_load)
1270 continue; 1419 continue;
1271 1420
1272 /* Don't pull more than imbalance/2 */ 1421 move_group_shares(tg, sd, busiest_cpu, this_cpu);
1273 imbalance /= 2;
1274 maxload = min(rem_load_move, imbalance);
1275 1422
1276 *this_best_prio = cfs_rq_best_prio(this_cfs_rq); 1423 moved_load *= aggregate(tg, sd)->load;
1277#else 1424 moved_load /= aggregate(tg, sd)->rq_weight + 1;
1278# define maxload rem_load_move
1279#endif
1280 /*
1281 * pass busy_cfs_rq argument into
1282 * load_balance_[start|next]_fair iterators
1283 */
1284 cfs_rq_iterator.arg = busy_cfs_rq;
1285 rem_load_move -= balance_tasks(this_rq, this_cpu, busiest,
1286 maxload, sd, idle, all_pinned,
1287 this_best_prio,
1288 &cfs_rq_iterator);
1289 1425
1290 if (rem_load_move <= 0) 1426 rem_load_move -= moved_load;
1427 if (rem_load_move < 0)
1291 break; 1428 break;
1292 } 1429 }
1430 rcu_read_unlock();
1293 1431
1294 return max_load_move - rem_load_move; 1432 return max_load_move - rem_load_move;
1295} 1433}
1434#else
1435static unsigned long
1436load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
1437 unsigned long max_load_move,
1438 struct sched_domain *sd, enum cpu_idle_type idle,
1439 int *all_pinned, int *this_best_prio)
1440{
1441 return __load_balance_fair(this_rq, this_cpu, busiest,
1442 max_load_move, sd, idle, all_pinned,
1443 this_best_prio, &busiest->cfs);
1444}
1445#endif
1296 1446
1297static int 1447static int
1298move_one_task_fair(struct rq *this_rq, int this_cpu, struct rq *busiest, 1448move_one_task_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
@@ -1461,16 +1611,40 @@ static const struct sched_class fair_sched_class = {
1461}; 1611};
1462 1612
1463#ifdef CONFIG_SCHED_DEBUG 1613#ifdef CONFIG_SCHED_DEBUG
1614static void
1615print_cfs_rq_tasks(struct seq_file *m, struct cfs_rq *cfs_rq, int depth)
1616{
1617 struct sched_entity *se;
1618
1619 if (!cfs_rq)
1620 return;
1621
1622 list_for_each_entry_rcu(se, &cfs_rq->tasks, group_node) {
1623 int i;
1624
1625 for (i = depth; i; i--)
1626 seq_puts(m, " ");
1627
1628 seq_printf(m, "%lu %s %lu\n",
1629 se->load.weight,
1630 entity_is_task(se) ? "T" : "G",
1631 calc_delta_weight(SCHED_LOAD_SCALE, se)
1632 );
1633 if (!entity_is_task(se))
1634 print_cfs_rq_tasks(m, group_cfs_rq(se), depth + 1);
1635 }
1636}
1637
1464static void print_cfs_stats(struct seq_file *m, int cpu) 1638static void print_cfs_stats(struct seq_file *m, int cpu)
1465{ 1639{
1466 struct cfs_rq *cfs_rq; 1640 struct cfs_rq *cfs_rq;
1467 1641
1468#ifdef CONFIG_FAIR_GROUP_SCHED
1469 print_cfs_rq(m, cpu, &cpu_rq(cpu)->cfs);
1470#endif
1471 rcu_read_lock(); 1642 rcu_read_lock();
1472 for_each_leaf_cfs_rq(cpu_rq(cpu), cfs_rq) 1643 for_each_leaf_cfs_rq(cpu_rq(cpu), cfs_rq)
1473 print_cfs_rq(m, cpu, cfs_rq); 1644 print_cfs_rq(m, cpu, cfs_rq);
1645
1646 seq_printf(m, "\nWeight tree:\n");
1647 print_cfs_rq_tasks(m, &cpu_rq(cpu)->cfs, 1);
1474 rcu_read_unlock(); 1648 rcu_read_unlock();
1475} 1649}
1476#endif 1650#endif
diff --git a/kernel/sched_features.h b/kernel/sched_features.h
new file mode 100644
index 000000000000..1c7283cb9581
--- /dev/null
+++ b/kernel/sched_features.h
@@ -0,0 +1,10 @@
1SCHED_FEAT(NEW_FAIR_SLEEPERS, 1)
2SCHED_FEAT(WAKEUP_PREEMPT, 1)
3SCHED_FEAT(START_DEBIT, 1)
4SCHED_FEAT(AFFINE_WAKEUPS, 1)
5SCHED_FEAT(CACHE_HOT_BUDDY, 1)
6SCHED_FEAT(SYNC_WAKEUPS, 1)
7SCHED_FEAT(HRTICK, 1)
8SCHED_FEAT(DOUBLE_TICK, 0)
9SCHED_FEAT(NORMALIZED_SLEEPER, 1)
10SCHED_FEAT(DEADLINE, 1)
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 0a6d2e516420..c2730a5a4f05 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -62,7 +62,12 @@ static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
62 if (!rt_rq->tg) 62 if (!rt_rq->tg)
63 return RUNTIME_INF; 63 return RUNTIME_INF;
64 64
65 return rt_rq->tg->rt_runtime; 65 return rt_rq->rt_runtime;
66}
67
68static inline u64 sched_rt_period(struct rt_rq *rt_rq)
69{
70 return ktime_to_ns(rt_rq->tg->rt_bandwidth.rt_period);
66} 71}
67 72
68#define for_each_leaf_rt_rq(rt_rq, rq) \ 73#define for_each_leaf_rt_rq(rt_rq, rq) \
@@ -127,14 +132,39 @@ static int rt_se_boosted(struct sched_rt_entity *rt_se)
127 return p->prio != p->normal_prio; 132 return p->prio != p->normal_prio;
128} 133}
129 134
135#ifdef CONFIG_SMP
136static inline cpumask_t sched_rt_period_mask(void)
137{
138 return cpu_rq(smp_processor_id())->rd->span;
139}
140#else
141static inline cpumask_t sched_rt_period_mask(void)
142{
143 return cpu_online_map;
144}
145#endif
146
147static inline
148struct rt_rq *sched_rt_period_rt_rq(struct rt_bandwidth *rt_b, int cpu)
149{
150 return container_of(rt_b, struct task_group, rt_bandwidth)->rt_rq[cpu];
151}
152
153static inline struct rt_bandwidth *sched_rt_bandwidth(struct rt_rq *rt_rq)
154{
155 return &rt_rq->tg->rt_bandwidth;
156}
157
130#else 158#else
131 159
132static inline u64 sched_rt_runtime(struct rt_rq *rt_rq) 160static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
133{ 161{
134 if (sysctl_sched_rt_runtime == -1) 162 return rt_rq->rt_runtime;
135 return RUNTIME_INF; 163}
136 164
137 return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC; 165static inline u64 sched_rt_period(struct rt_rq *rt_rq)
166{
167 return ktime_to_ns(def_rt_bandwidth.rt_period);
138} 168}
139 169
140#define for_each_leaf_rt_rq(rt_rq, rq) \ 170#define for_each_leaf_rt_rq(rt_rq, rq) \
@@ -173,6 +203,102 @@ static inline int rt_rq_throttled(struct rt_rq *rt_rq)
173{ 203{
174 return rt_rq->rt_throttled; 204 return rt_rq->rt_throttled;
175} 205}
206
207static inline cpumask_t sched_rt_period_mask(void)
208{
209 return cpu_online_map;
210}
211
212static inline
213struct rt_rq *sched_rt_period_rt_rq(struct rt_bandwidth *rt_b, int cpu)
214{
215 return &cpu_rq(cpu)->rt;
216}
217
218static inline struct rt_bandwidth *sched_rt_bandwidth(struct rt_rq *rt_rq)
219{
220 return &def_rt_bandwidth;
221}
222
223#endif
224
225static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
226{
227 int i, idle = 1;
228 cpumask_t span;
229
230 if (rt_b->rt_runtime == RUNTIME_INF)
231 return 1;
232
233 span = sched_rt_period_mask();
234 for_each_cpu_mask(i, span) {
235 int enqueue = 0;
236 struct rt_rq *rt_rq = sched_rt_period_rt_rq(rt_b, i);
237 struct rq *rq = rq_of_rt_rq(rt_rq);
238
239 spin_lock(&rq->lock);
240 if (rt_rq->rt_time) {
241 u64 runtime;
242
243 spin_lock(&rt_rq->rt_runtime_lock);
244 runtime = rt_rq->rt_runtime;
245 rt_rq->rt_time -= min(rt_rq->rt_time, overrun*runtime);
246 if (rt_rq->rt_throttled && rt_rq->rt_time < runtime) {
247 rt_rq->rt_throttled = 0;
248 enqueue = 1;
249 }
250 if (rt_rq->rt_time || rt_rq->rt_nr_running)
251 idle = 0;
252 spin_unlock(&rt_rq->rt_runtime_lock);
253 }
254
255 if (enqueue)
256 sched_rt_rq_enqueue(rt_rq);
257 spin_unlock(&rq->lock);
258 }
259
260 return idle;
261}
262
263#ifdef CONFIG_SMP
264static int balance_runtime(struct rt_rq *rt_rq)
265{
266 struct rt_bandwidth *rt_b = sched_rt_bandwidth(rt_rq);
267 struct root_domain *rd = cpu_rq(smp_processor_id())->rd;
268 int i, weight, more = 0;
269 u64 rt_period;
270
271 weight = cpus_weight(rd->span);
272
273 spin_lock(&rt_b->rt_runtime_lock);
274 rt_period = ktime_to_ns(rt_b->rt_period);
275 for_each_cpu_mask(i, rd->span) {
276 struct rt_rq *iter = sched_rt_period_rt_rq(rt_b, i);
277 s64 diff;
278
279 if (iter == rt_rq)
280 continue;
281
282 spin_lock(&iter->rt_runtime_lock);
283 diff = iter->rt_runtime - iter->rt_time;
284 if (diff > 0) {
285 do_div(diff, weight);
286 if (rt_rq->rt_runtime + diff > rt_period)
287 diff = rt_period - rt_rq->rt_runtime;
288 iter->rt_runtime -= diff;
289 rt_rq->rt_runtime += diff;
290 more = 1;
291 if (rt_rq->rt_runtime == rt_period) {
292 spin_unlock(&iter->rt_runtime_lock);
293 break;
294 }
295 }
296 spin_unlock(&iter->rt_runtime_lock);
297 }
298 spin_unlock(&rt_b->rt_runtime_lock);
299
300 return more;
301}
176#endif 302#endif
177 303
178static inline int rt_se_prio(struct sched_rt_entity *rt_se) 304static inline int rt_se_prio(struct sched_rt_entity *rt_se)
@@ -197,12 +323,24 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
197 if (rt_rq->rt_throttled) 323 if (rt_rq->rt_throttled)
198 return rt_rq_throttled(rt_rq); 324 return rt_rq_throttled(rt_rq);
199 325
326 if (sched_rt_runtime(rt_rq) >= sched_rt_period(rt_rq))
327 return 0;
328
329#ifdef CONFIG_SMP
200 if (rt_rq->rt_time > runtime) { 330 if (rt_rq->rt_time > runtime) {
201 struct rq *rq = rq_of_rt_rq(rt_rq); 331 int more;
202 332
203 rq->rt_throttled = 1; 333 spin_unlock(&rt_rq->rt_runtime_lock);
204 rt_rq->rt_throttled = 1; 334 more = balance_runtime(rt_rq);
335 spin_lock(&rt_rq->rt_runtime_lock);
205 336
337 if (more)
338 runtime = sched_rt_runtime(rt_rq);
339 }
340#endif
341
342 if (rt_rq->rt_time > runtime) {
343 rt_rq->rt_throttled = 1;
206 if (rt_rq_throttled(rt_rq)) { 344 if (rt_rq_throttled(rt_rq)) {
207 sched_rt_rq_dequeue(rt_rq); 345 sched_rt_rq_dequeue(rt_rq);
208 return 1; 346 return 1;
@@ -212,29 +350,6 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
212 return 0; 350 return 0;
213} 351}
214 352
215static void update_sched_rt_period(struct rq *rq)
216{
217 struct rt_rq *rt_rq;
218 u64 period;
219
220 while (rq->clock > rq->rt_period_expire) {
221 period = (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
222 rq->rt_period_expire += period;
223
224 for_each_leaf_rt_rq(rt_rq, rq) {
225 u64 runtime = sched_rt_runtime(rt_rq);
226
227 rt_rq->rt_time -= min(rt_rq->rt_time, runtime);
228 if (rt_rq->rt_throttled && rt_rq->rt_time < runtime) {
229 rt_rq->rt_throttled = 0;
230 sched_rt_rq_enqueue(rt_rq);
231 }
232 }
233
234 rq->rt_throttled = 0;
235 }
236}
237
238/* 353/*
239 * Update the current task's runtime statistics. Skip current tasks that 354 * Update the current task's runtime statistics. Skip current tasks that
240 * are not in our scheduling class. 355 * are not in our scheduling class.
@@ -259,9 +374,15 @@ static void update_curr_rt(struct rq *rq)
259 curr->se.exec_start = rq->clock; 374 curr->se.exec_start = rq->clock;
260 cpuacct_charge(curr, delta_exec); 375 cpuacct_charge(curr, delta_exec);
261 376
262 rt_rq->rt_time += delta_exec; 377 for_each_sched_rt_entity(rt_se) {
263 if (sched_rt_runtime_exceeded(rt_rq)) 378 rt_rq = rt_rq_of_se(rt_se);
264 resched_task(curr); 379
380 spin_lock(&rt_rq->rt_runtime_lock);
381 rt_rq->rt_time += delta_exec;
382 if (sched_rt_runtime_exceeded(rt_rq))
383 resched_task(curr);
384 spin_unlock(&rt_rq->rt_runtime_lock);
385 }
265} 386}
266 387
267static inline 388static inline
@@ -284,6 +405,11 @@ void inc_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
284#ifdef CONFIG_RT_GROUP_SCHED 405#ifdef CONFIG_RT_GROUP_SCHED
285 if (rt_se_boosted(rt_se)) 406 if (rt_se_boosted(rt_se))
286 rt_rq->rt_nr_boosted++; 407 rt_rq->rt_nr_boosted++;
408
409 if (rt_rq->tg)
410 start_rt_bandwidth(&rt_rq->tg->rt_bandwidth);
411#else
412 start_rt_bandwidth(&def_rt_bandwidth);
287#endif 413#endif
288} 414}
289 415
@@ -353,27 +479,21 @@ static void dequeue_rt_entity(struct sched_rt_entity *rt_se)
353/* 479/*
354 * Because the prio of an upper entry depends on the lower 480 * Because the prio of an upper entry depends on the lower
355 * entries, we must remove entries top - down. 481 * entries, we must remove entries top - down.
356 *
357 * XXX: O(1/2 h^2) because we can only walk up, not down the chain.
358 * doesn't matter much for now, as h=2 for GROUP_SCHED.
359 */ 482 */
360static void dequeue_rt_stack(struct task_struct *p) 483static void dequeue_rt_stack(struct task_struct *p)
361{ 484{
362 struct sched_rt_entity *rt_se, *top_se; 485 struct sched_rt_entity *rt_se, *back = NULL;
363 486
364 /* 487 rt_se = &p->rt;
365 * dequeue all, top - down. 488 for_each_sched_rt_entity(rt_se) {
366 */ 489 rt_se->back = back;
367 do { 490 back = rt_se;
368 rt_se = &p->rt; 491 }
369 top_se = NULL; 492
370 for_each_sched_rt_entity(rt_se) { 493 for (rt_se = back; rt_se; rt_se = rt_se->back) {
371 if (on_rt_rq(rt_se)) 494 if (on_rt_rq(rt_se))
372 top_se = rt_se; 495 dequeue_rt_entity(rt_se);
373 } 496 }
374 if (top_se)
375 dequeue_rt_entity(top_se);
376 } while (top_se);
377} 497}
378 498
379/* 499/*
@@ -393,6 +513,8 @@ static void enqueue_task_rt(struct rq *rq, struct task_struct *p, int wakeup)
393 */ 513 */
394 for_each_sched_rt_entity(rt_se) 514 for_each_sched_rt_entity(rt_se)
395 enqueue_rt_entity(rt_se); 515 enqueue_rt_entity(rt_se);
516
517 inc_cpu_load(rq, p->se.load.weight);
396} 518}
397 519
398static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep) 520static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep)
@@ -412,6 +534,8 @@ static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep)
412 if (rt_rq && rt_rq->rt_nr_running) 534 if (rt_rq && rt_rq->rt_nr_running)
413 enqueue_rt_entity(rt_se); 535 enqueue_rt_entity(rt_se);
414 } 536 }
537
538 dec_cpu_load(rq, p->se.load.weight);
415} 539}
416 540
417/* 541/*
@@ -1001,7 +1125,8 @@ move_one_task_rt(struct rq *this_rq, int this_cpu, struct rq *busiest,
1001 return 0; 1125 return 0;
1002} 1126}
1003 1127
1004static void set_cpus_allowed_rt(struct task_struct *p, cpumask_t *new_mask) 1128static void set_cpus_allowed_rt(struct task_struct *p,
1129 const cpumask_t *new_mask)
1005{ 1130{
1006 int weight = cpus_weight(*new_mask); 1131 int weight = cpus_weight(*new_mask);
1007 1132
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index 5b32433e7ee5..5bae2e0c3ff2 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -9,6 +9,11 @@
9static int show_schedstat(struct seq_file *seq, void *v) 9static int show_schedstat(struct seq_file *seq, void *v)
10{ 10{
11 int cpu; 11 int cpu;
12 int mask_len = NR_CPUS/32 * 9;
13 char *mask_str = kmalloc(mask_len, GFP_KERNEL);
14
15 if (mask_str == NULL)
16 return -ENOMEM;
12 17
13 seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION); 18 seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
14 seq_printf(seq, "timestamp %lu\n", jiffies); 19 seq_printf(seq, "timestamp %lu\n", jiffies);
@@ -36,9 +41,8 @@ static int show_schedstat(struct seq_file *seq, void *v)
36 preempt_disable(); 41 preempt_disable();
37 for_each_domain(cpu, sd) { 42 for_each_domain(cpu, sd) {
38 enum cpu_idle_type itype; 43 enum cpu_idle_type itype;
39 char mask_str[NR_CPUS];
40 44
41 cpumask_scnprintf(mask_str, NR_CPUS, sd->span); 45 cpumask_scnprintf(mask_str, mask_len, sd->span);
42 seq_printf(seq, "domain%d %s", dcount++, mask_str); 46 seq_printf(seq, "domain%d %s", dcount++, mask_str);
43 for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES; 47 for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
44 itype++) { 48 itype++) {
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 31e9f2a47928..3c44956ee7e2 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -356,7 +356,8 @@ void open_softirq(int nr, void (*action)(struct softirq_action*), void *data)
356/* Tasklets */ 356/* Tasklets */
357struct tasklet_head 357struct tasklet_head
358{ 358{
359 struct tasklet_struct *list; 359 struct tasklet_struct *head;
360 struct tasklet_struct **tail;
360}; 361};
361 362
362/* Some compilers disobey section attribute on statics when not 363/* Some compilers disobey section attribute on statics when not
@@ -369,8 +370,9 @@ void __tasklet_schedule(struct tasklet_struct *t)
369 unsigned long flags; 370 unsigned long flags;
370 371
371 local_irq_save(flags); 372 local_irq_save(flags);
372 t->next = __get_cpu_var(tasklet_vec).list; 373 t->next = NULL;
373 __get_cpu_var(tasklet_vec).list = t; 374 *__get_cpu_var(tasklet_vec).tail = t;
375 __get_cpu_var(tasklet_vec).tail = &(t->next);
374 raise_softirq_irqoff(TASKLET_SOFTIRQ); 376 raise_softirq_irqoff(TASKLET_SOFTIRQ);
375 local_irq_restore(flags); 377 local_irq_restore(flags);
376} 378}
@@ -382,8 +384,9 @@ void __tasklet_hi_schedule(struct tasklet_struct *t)
382 unsigned long flags; 384 unsigned long flags;
383 385
384 local_irq_save(flags); 386 local_irq_save(flags);
385 t->next = __get_cpu_var(tasklet_hi_vec).list; 387 t->next = NULL;
386 __get_cpu_var(tasklet_hi_vec).list = t; 388 *__get_cpu_var(tasklet_hi_vec).tail = t;
389 __get_cpu_var(tasklet_hi_vec).tail = &(t->next);
387 raise_softirq_irqoff(HI_SOFTIRQ); 390 raise_softirq_irqoff(HI_SOFTIRQ);
388 local_irq_restore(flags); 391 local_irq_restore(flags);
389} 392}
@@ -395,8 +398,9 @@ static void tasklet_action(struct softirq_action *a)
395 struct tasklet_struct *list; 398 struct tasklet_struct *list;
396 399
397 local_irq_disable(); 400 local_irq_disable();
398 list = __get_cpu_var(tasklet_vec).list; 401 list = __get_cpu_var(tasklet_vec).head;
399 __get_cpu_var(tasklet_vec).list = NULL; 402 __get_cpu_var(tasklet_vec).head = NULL;
403 __get_cpu_var(tasklet_vec).tail = &__get_cpu_var(tasklet_vec).head;
400 local_irq_enable(); 404 local_irq_enable();
401 405
402 while (list) { 406 while (list) {
@@ -416,8 +420,9 @@ static void tasklet_action(struct softirq_action *a)
416 } 420 }
417 421
418 local_irq_disable(); 422 local_irq_disable();
419 t->next = __get_cpu_var(tasklet_vec).list; 423 t->next = NULL;
420 __get_cpu_var(tasklet_vec).list = t; 424 *__get_cpu_var(tasklet_vec).tail = t;
425 __get_cpu_var(tasklet_vec).tail = &(t->next);
421 __raise_softirq_irqoff(TASKLET_SOFTIRQ); 426 __raise_softirq_irqoff(TASKLET_SOFTIRQ);
422 local_irq_enable(); 427 local_irq_enable();
423 } 428 }
@@ -428,8 +433,9 @@ static void tasklet_hi_action(struct softirq_action *a)
428 struct tasklet_struct *list; 433 struct tasklet_struct *list;
429 434
430 local_irq_disable(); 435 local_irq_disable();
431 list = __get_cpu_var(tasklet_hi_vec).list; 436 list = __get_cpu_var(tasklet_hi_vec).head;
432 __get_cpu_var(tasklet_hi_vec).list = NULL; 437 __get_cpu_var(tasklet_hi_vec).head = NULL;
438 __get_cpu_var(tasklet_hi_vec).tail = &__get_cpu_var(tasklet_hi_vec).head;
433 local_irq_enable(); 439 local_irq_enable();
434 440
435 while (list) { 441 while (list) {
@@ -449,8 +455,9 @@ static void tasklet_hi_action(struct softirq_action *a)
449 } 455 }
450 456
451 local_irq_disable(); 457 local_irq_disable();
452 t->next = __get_cpu_var(tasklet_hi_vec).list; 458 t->next = NULL;
453 __get_cpu_var(tasklet_hi_vec).list = t; 459 *__get_cpu_var(tasklet_hi_vec).tail = t;
460 __get_cpu_var(tasklet_hi_vec).tail = &(t->next);
454 __raise_softirq_irqoff(HI_SOFTIRQ); 461 __raise_softirq_irqoff(HI_SOFTIRQ);
455 local_irq_enable(); 462 local_irq_enable();
456 } 463 }
@@ -487,6 +494,15 @@ EXPORT_SYMBOL(tasklet_kill);
487 494
488void __init softirq_init(void) 495void __init softirq_init(void)
489{ 496{
497 int cpu;
498
499 for_each_possible_cpu(cpu) {
500 per_cpu(tasklet_vec, cpu).tail =
501 &per_cpu(tasklet_vec, cpu).head;
502 per_cpu(tasklet_hi_vec, cpu).tail =
503 &per_cpu(tasklet_hi_vec, cpu).head;
504 }
505
490 open_softirq(TASKLET_SOFTIRQ, tasklet_action, NULL); 506 open_softirq(TASKLET_SOFTIRQ, tasklet_action, NULL);
491 open_softirq(HI_SOFTIRQ, tasklet_hi_action, NULL); 507 open_softirq(HI_SOFTIRQ, tasklet_hi_action, NULL);
492} 508}
@@ -555,9 +571,12 @@ void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu)
555 return; 571 return;
556 572
557 /* CPU is dead, so no lock needed. */ 573 /* CPU is dead, so no lock needed. */
558 for (i = &per_cpu(tasklet_vec, cpu).list; *i; i = &(*i)->next) { 574 for (i = &per_cpu(tasklet_vec, cpu).head; *i; i = &(*i)->next) {
559 if (*i == t) { 575 if (*i == t) {
560 *i = t->next; 576 *i = t->next;
577 /* If this was the tail element, move the tail ptr */
578 if (*i == NULL)
579 per_cpu(tasklet_vec, cpu).tail = i;
561 return; 580 return;
562 } 581 }
563 } 582 }
@@ -566,20 +585,20 @@ void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu)
566 585
567static void takeover_tasklets(unsigned int cpu) 586static void takeover_tasklets(unsigned int cpu)
568{ 587{
569 struct tasklet_struct **i;
570
571 /* CPU is dead, so no lock needed. */ 588 /* CPU is dead, so no lock needed. */
572 local_irq_disable(); 589 local_irq_disable();
573 590
574 /* Find end, append list for that CPU. */ 591 /* Find end, append list for that CPU. */
575 for (i = &__get_cpu_var(tasklet_vec).list; *i; i = &(*i)->next); 592 *__get_cpu_var(tasklet_vec).tail = per_cpu(tasklet_vec, cpu).head;
576 *i = per_cpu(tasklet_vec, cpu).list; 593 __get_cpu_var(tasklet_vec).tail = per_cpu(tasklet_vec, cpu).tail;
577 per_cpu(tasklet_vec, cpu).list = NULL; 594 per_cpu(tasklet_vec, cpu).head = NULL;
595 per_cpu(tasklet_vec, cpu).tail = &per_cpu(tasklet_vec, cpu).head;
578 raise_softirq_irqoff(TASKLET_SOFTIRQ); 596 raise_softirq_irqoff(TASKLET_SOFTIRQ);
579 597
580 for (i = &__get_cpu_var(tasklet_hi_vec).list; *i; i = &(*i)->next); 598 *__get_cpu_var(tasklet_hi_vec).tail = per_cpu(tasklet_hi_vec, cpu).head;
581 *i = per_cpu(tasklet_hi_vec, cpu).list; 599 __get_cpu_var(tasklet_hi_vec).tail = per_cpu(tasklet_hi_vec, cpu).tail;
582 per_cpu(tasklet_hi_vec, cpu).list = NULL; 600 per_cpu(tasklet_hi_vec, cpu).head = NULL;
601 per_cpu(tasklet_hi_vec, cpu).tail = &per_cpu(tasklet_hi_vec, cpu).head;
583 raise_softirq_irqoff(HI_SOFTIRQ); 602 raise_softirq_irqoff(HI_SOFTIRQ);
584 603
585 local_irq_enable(); 604 local_irq_enable();
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 6f4e0e13f70c..e1b2a5b1b105 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -35,7 +35,7 @@ static int stopmachine(void *cpu)
35 int irqs_disabled = 0; 35 int irqs_disabled = 0;
36 int prepared = 0; 36 int prepared = 0;
37 37
38 set_cpus_allowed(current, cpumask_of_cpu((int)(long)cpu)); 38 set_cpus_allowed_ptr(current, &cpumask_of_cpu((int)(long)cpu));
39 39
40 /* Ack: we are alive */ 40 /* Ack: we are alive */
41 smp_mb(); /* Theoretically the ack = 0 might not be on this CPU yet. */ 41 smp_mb(); /* Theoretically the ack = 0 might not be on this CPU yet. */
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index b2a2d6889bab..fd3364827ccf 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -270,17 +270,6 @@ static struct ctl_table kern_table[] = {
270 }, 270 },
271 { 271 {
272 .ctl_name = CTL_UNNUMBERED, 272 .ctl_name = CTL_UNNUMBERED,
273 .procname = "sched_batch_wakeup_granularity_ns",
274 .data = &sysctl_sched_batch_wakeup_granularity,
275 .maxlen = sizeof(unsigned int),
276 .mode = 0644,
277 .proc_handler = &proc_dointvec_minmax,
278 .strategy = &sysctl_intvec,
279 .extra1 = &min_wakeup_granularity_ns,
280 .extra2 = &max_wakeup_granularity_ns,
281 },
282 {
283 .ctl_name = CTL_UNNUMBERED,
284 .procname = "sched_child_runs_first", 273 .procname = "sched_child_runs_first",
285 .data = &sysctl_sched_child_runs_first, 274 .data = &sysctl_sched_child_runs_first,
286 .maxlen = sizeof(unsigned int), 275 .maxlen = sizeof(unsigned int),
@@ -318,7 +307,7 @@ static struct ctl_table kern_table[] = {
318 .data = &sysctl_sched_rt_period, 307 .data = &sysctl_sched_rt_period,
319 .maxlen = sizeof(unsigned int), 308 .maxlen = sizeof(unsigned int),
320 .mode = 0644, 309 .mode = 0644,
321 .proc_handler = &proc_dointvec, 310 .proc_handler = &sched_rt_handler,
322 }, 311 },
323 { 312 {
324 .ctl_name = CTL_UNNUMBERED, 313 .ctl_name = CTL_UNNUMBERED,
@@ -326,7 +315,7 @@ static struct ctl_table kern_table[] = {
326 .data = &sysctl_sched_rt_runtime, 315 .data = &sysctl_sched_rt_runtime,
327 .maxlen = sizeof(int), 316 .maxlen = sizeof(int),
328 .mode = 0644, 317 .mode = 0644,
329 .proc_handler = &proc_dointvec, 318 .proc_handler = &sched_rt_handler,
330 }, 319 },
331 { 320 {
332 .ctl_name = CTL_UNNUMBERED, 321 .ctl_name = CTL_UNNUMBERED,
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 69dba0c71727..d358d4e3a958 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -191,7 +191,6 @@ u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
191void tick_nohz_stop_sched_tick(void) 191void tick_nohz_stop_sched_tick(void)
192{ 192{
193 unsigned long seq, last_jiffies, next_jiffies, delta_jiffies, flags; 193 unsigned long seq, last_jiffies, next_jiffies, delta_jiffies, flags;
194 unsigned long rt_jiffies;
195 struct tick_sched *ts; 194 struct tick_sched *ts;
196 ktime_t last_update, expires, now; 195 ktime_t last_update, expires, now;
197 struct clock_event_device *dev = __get_cpu_var(tick_cpu_device).evtdev; 196 struct clock_event_device *dev = __get_cpu_var(tick_cpu_device).evtdev;
@@ -243,10 +242,6 @@ void tick_nohz_stop_sched_tick(void)
243 next_jiffies = get_next_timer_interrupt(last_jiffies); 242 next_jiffies = get_next_timer_interrupt(last_jiffies);
244 delta_jiffies = next_jiffies - last_jiffies; 243 delta_jiffies = next_jiffies - last_jiffies;
245 244
246 rt_jiffies = rt_needs_cpu(cpu);
247 if (rt_jiffies && rt_jiffies < delta_jiffies)
248 delta_jiffies = rt_jiffies;
249
250 if (rcu_needs_cpu(cpu)) 245 if (rcu_needs_cpu(cpu))
251 delta_jiffies = 1; 246 delta_jiffies = 1;
252 /* 247 /*
diff --git a/kernel/user.c b/kernel/user.c
index 7132022a040c..debce602bfdd 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -101,7 +101,7 @@ static int sched_create_user(struct user_struct *up)
101{ 101{
102 int rc = 0; 102 int rc = 0;
103 103
104 up->tg = sched_create_group(); 104 up->tg = sched_create_group(&root_task_group);
105 if (IS_ERR(up->tg)) 105 if (IS_ERR(up->tg))
106 rc = -ENOMEM; 106 rc = -ENOMEM;
107 107
@@ -193,6 +193,33 @@ static ssize_t cpu_rt_runtime_store(struct kobject *kobj,
193 193
194static struct kobj_attribute cpu_rt_runtime_attr = 194static struct kobj_attribute cpu_rt_runtime_attr =
195 __ATTR(cpu_rt_runtime, 0644, cpu_rt_runtime_show, cpu_rt_runtime_store); 195 __ATTR(cpu_rt_runtime, 0644, cpu_rt_runtime_show, cpu_rt_runtime_store);
196
197static ssize_t cpu_rt_period_show(struct kobject *kobj,
198 struct kobj_attribute *attr,
199 char *buf)
200{
201 struct user_struct *up = container_of(kobj, struct user_struct, kobj);
202
203 return sprintf(buf, "%lu\n", sched_group_rt_period(up->tg));
204}
205
206static ssize_t cpu_rt_period_store(struct kobject *kobj,
207 struct kobj_attribute *attr,
208 const char *buf, size_t size)
209{
210 struct user_struct *up = container_of(kobj, struct user_struct, kobj);
211 unsigned long rt_period;
212 int rc;
213
214 sscanf(buf, "%lu", &rt_period);
215
216 rc = sched_group_set_rt_period(up->tg, rt_period);
217
218 return (rc ? rc : size);
219}
220
221static struct kobj_attribute cpu_rt_period_attr =
222 __ATTR(cpu_rt_period, 0644, cpu_rt_period_show, cpu_rt_period_store);
196#endif 223#endif
197 224
198/* default attributes per uid directory */ 225/* default attributes per uid directory */
@@ -202,6 +229,7 @@ static struct attribute *uids_attributes[] = {
202#endif 229#endif
203#ifdef CONFIG_RT_GROUP_SCHED 230#ifdef CONFIG_RT_GROUP_SCHED
204 &cpu_rt_runtime_attr.attr, 231 &cpu_rt_runtime_attr.attr,
232 &cpu_rt_period_attr.attr,
205#endif 233#endif
206 NULL 234 NULL
207}; 235};
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-21 14:09:34 -0400