Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (31 commits)
  sched: fix warning in fs/proc/base.c
  schedstat: consolidate per-task cpu runtime stats
  sched: use RCU variant of list traversal in for_each_leaf_rt_rq()
  sched, cpuacct: export percpu cpuacct cgroup stats
  sched, cpuacct: refactoring cpuusage_read / cpuusage_write
  sched: optimize update_curr()
  sched: fix wakeup preemption clock
  sched: add missing arch_update_cpu_topology() call
  sched: let arch_update_cpu_topology indicate if topology changed
  sched: idle_balance() does not call load_balance_newidle()
  sched: fix sd_parent_degenerate on non-numa smp machine
  sched: add uid information to sched_debug for CONFIG_USER_SCHED
  sched: move double_unlock_balance() higher
  sched: update comment for move_task_off_dead_cpu
  sched: fix inconsistency when redistribute per-cpu tg->cfs_rq shares
  sched/rt: removed unneeded defintion
  sched: add hierarchical accounting to cpu accounting controller
  sched: include group statistics in /proc/sched_debug
  sched: rename SCHED_NO_NO_OMIT_FRAME_POINTER => SCHED_OMIT_FRAME_POINTER
  sched: clean up SCHED_CPUMASK_ALLOC
  ...

20 files changed, 299 insertions, 222 deletions

diff --git a/Documentation/controllers/cpuacct.txt b/Documentation/controllers/cpuacct.txt
new file mode 100644
index 000000000000..bb775fbe43d7
--- /dev/null
+++ b/Documentation/controllers/cpuacct.txt
@@ -0,0 +1,32 @@
+CPU Accounting Controller
+-------------------------
+
+The CPU accounting controller is used to group tasks using cgroups and
+account the CPU usage of these groups of tasks.
+
+The CPU accounting controller supports multi-hierarchy groups. An accounting
+group accumulates the CPU usage of all of its child groups and the tasks
+directly present in its group.
+
+Accounting groups can be created by first mounting the cgroup filesystem.
+
+# mkdir /cgroups
+# mount -t cgroup -ocpuacct none /cgroups
+
+With the above step, the initial or the parent accounting group
+becomes visible at /cgroups. At bootup, this group includes all the
+tasks in the system. /cgroups/tasks lists the tasks in this cgroup.
+/cgroups/cpuacct.usage gives the CPU time (in nanoseconds) obtained by
+this group which is essentially the CPU time obtained by all the tasks
+in the system.
+
+New accounting groups can be created under the parent group /cgroups.
+
+# cd /cgroups
+# mkdir g1
+# echo $$ > g1
+
+The above steps create a new group g1 and move the current shell
+process (bash) into it. CPU time consumed by this bash and its children
+can be obtained from g1/cpuacct.usage and the same is accumulated in
+/cgroups/cpuacct.usage also.
diff --git a/Documentation/scheduler/sched-arch.txt b/Documentation/scheduler/sched-arch.txt
index 941615a9769b..d43dbcbd163b 100644
--- a/Documentation/scheduler/sched-arch.txt
+++ b/Documentation/scheduler/sched-arch.txt
@@ -8,7 +8,7 @@ Context switch
 By default, the switch_to arch function is called with the runqueue
 locked. This is usually not a problem unless switch_to may need to
 take the runqueue lock. This is usually due to a wake up operation in
-the context switch. See include/asm-ia64/system.h for an example.
+the context switch. See arch/ia64/include/asm/system.h for an example.
 
 To request the scheduler call switch_to with the runqueue unlocked,
 you must `#define __ARCH_WANT_UNLOCKED_CTXSW` in a header file
@@ -23,7 +23,7 @@ disabled. Interrupts may be enabled over the call if it is likely to
 introduce a significant interrupt latency by adding the line
 `#define __ARCH_WANT_INTERRUPTS_ON_CTXSW` in the same place as for
 unlocked context switches. This define also implies
-`__ARCH_WANT_UNLOCKED_CTXSW`. See include/asm-arm/system.h for an
+`__ARCH_WANT_UNLOCKED_CTXSW`. See arch/arm/include/asm/system.h for an
 example.
 
 
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 6bd91ed7cd03..7fa8f615ba6e 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -99,7 +99,7 @@ config GENERIC_IOMAP
         bool
         default y
 
-config SCHED_NO_NO_OMIT_FRAME_POINTER
+config SCHED_OMIT_FRAME_POINTER
         bool
         default y
 
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index dbaed4a63815..29047d5c259a 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -273,7 +273,7 @@ config GENERIC_CALIBRATE_DELAY
         bool
         default y
 
-config SCHED_NO_NO_OMIT_FRAME_POINTER
+config SCHED_OMIT_FRAME_POINTER
         bool
         default y
 
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index f4af967a6b30..a5255e7c79e0 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -653,7 +653,7 @@ config GENERIC_CMOS_UPDATE
         bool
         default y
 
-config SCHED_NO_NO_OMIT_FRAME_POINTER
+config SCHED_OMIT_FRAME_POINTER
         bool
         default y
 
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 525c13a4de93..adb23ea1c1ef 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -141,7 +141,7 @@ config GENERIC_NVRAM
         bool
         default y if PPC32
 
-config SCHED_NO_NO_OMIT_FRAME_POINTER
+config SCHED_OMIT_FRAME_POINTER
         bool
         default y
 
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index a947899dcba1..bf96f1b5c6ec 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -212,7 +212,7 @@ static void update_cpu_core_map(void)
                 cpu_core_map[cpu] = cpu_coregroup_map(cpu);
 }
 
-void arch_update_cpu_topology(void)
+int arch_update_cpu_topology(void)
 {
         struct tl_info *info = tl_info;
         struct sys_device *sysdev;
@@ -221,7 +221,7 @@ void arch_update_cpu_topology(void)
         if (!machine_has_topology) {
                 update_cpu_core_map();
                 topology_update_polarization_simple();
-                return;
+                return 0;
         }
         stsi(info, 15, 1, 2);
         tl_to_cores(info);
@@ -230,6 +230,7 @@ void arch_update_cpu_topology(void)
                 sysdev = get_cpu_sysdev(cpu);
                 kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
         }
+        return 1;
 }
 
 static void topology_work_fn(struct work_struct *work)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 7b17f9d72ba1..98a0ed52b5c3 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -368,10 +368,10 @@ config X86_RDC321X
           as R-8610-(G).
           If you don't have one of these chips, you should say N here.
 
-config SCHED_NO_NO_OMIT_FRAME_POINTER
+config SCHED_OMIT_FRAME_POINTER
         def_bool y
         prompt "Single-depth WCHAN output"
-        depends on X86_32
+        depends on X86
         help
           Calculate simpler /proc/<PID>/wchan values. If this option
           is disabled then wchan values will recurse back to the
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 0a8a5f880349..cad92c1ac2b3 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -347,8 +347,8 @@ static int proc_pid_wchan(struct task_struct *task, char *buffer)
 static int proc_pid_schedstat(struct task_struct *task, char *buffer)
 {
         return sprintf(buffer, "%llu %llu %lu\n",
-                        task->sched_info.cpu_time,
-                        task->sched_info.run_delay,
+                        (unsigned long long)task->se.sum_exec_runtime,
+                        (unsigned long long)task->sched_info.run_delay,
                         task->sched_info.pcount);
 }
 #endif
diff --git a/include/asm-m32r/system.h b/include/asm-m32r/system.h
index 70a57c8c002b..c980f5ba8de7 100644
--- a/include/asm-m32r/system.h
+++ b/include/asm-m32r/system.h
@@ -23,7 +23,7 @@
  */
 
 #if defined(CONFIG_FRAME_POINTER) || \
-        !defined(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER)
+        !defined(CONFIG_SCHED_OMIT_FRAME_POINTER)
 #define M32R_PUSH_FP "  push fp\n"
 #define M32R_POP_FP  "  pop  fp\n"
 #else
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 0a1094d84b77..8395e715809d 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -260,8 +260,6 @@ static inline int select_nohz_load_balancer(int cpu)
 }
 #endif
 
-extern unsigned long rt_needs_cpu(int cpu);
-
 /*
  * Only dump TASK_* tasks. (0 for all tasks)
  */
@@ -669,8 +667,7 @@ struct reclaim_state;
 struct sched_info {
         /* cumulative counters */
         unsigned long pcount;         /* # of times run on this cpu */
-        unsigned long long cpu_time,  /* time spent on the cpu */
-                           run_delay; /* time spent waiting on a runqueue */
+        unsigned long long run_delay; /* time spent waiting on a runqueue */
 
         /* timestamps */
         unsigned long long last_arrival,/* when we last ran on a cpu */
@@ -2210,6 +2207,7 @@ extern void normalize_rt_tasks(void);
 extern struct task_group init_task_group;
 #ifdef CONFIG_USER_SCHED
 extern struct task_group root_task_group;
+extern void set_tg_uid(struct user_struct *user);
 #endif
 
 extern struct task_group *sched_create_group(struct task_group *parent);
diff --git a/include/linux/topology.h b/include/linux/topology.h
index 117f1b7405cf..0c5b5ac36d8e 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -49,7 +49,7 @@
         for_each_online_node(node)                      \
                 if (nr_cpus_node(node))
 
-void arch_update_cpu_topology(void);
+int arch_update_cpu_topology(void);
 
 /* Conform to ACPI 2.0 SLIT distance definitions */
 #define LOCAL_DISTANCE          10
diff --git a/kernel/Makefile b/kernel/Makefile
index b1e6b6625ea2..027edda63511 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -19,7 +19,6 @@ CFLAGS_REMOVE_mutex-debug.o = -pg
 CFLAGS_REMOVE_rtmutex-debug.o = -pg
 CFLAGS_REMOVE_cgroup-debug.o = -pg
 CFLAGS_REMOVE_sched_clock.o = -pg
-CFLAGS_REMOVE_sched.o = -pg
 endif
 
 obj-$(CONFIG_FREEZER) += freezer.o
@@ -90,7 +89,7 @@ obj-$(CONFIG_FUNCTION_TRACER) += trace/
 obj-$(CONFIG_TRACING) += trace/
 obj-$(CONFIG_SMP) += sched_cpupri.o
 
-ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y)
+ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
 # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
 # needed for x86 only.  Why this used to be enabled for all architectures is beyond
 # me.  I suspect most platforms don't need this, but until we know that for sure
diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index b3179dad71be..abb6e17505e2 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -127,7 +127,7 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
          */
         t1 = tsk->sched_info.pcount;
         t2 = tsk->sched_info.run_delay;
-        t3 = tsk->sched_info.cpu_time;
+        t3 = tsk->se.sum_exec_runtime;
 
         d->cpu_count += t1;
 
diff --git a/kernel/sched.c b/kernel/sched.c
index 3798b954e6e8..748ff924a290 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -267,6 +267,10 @@ struct task_group {
         struct cgroup_subsys_state css;
 #endif
 
+#ifdef CONFIG_USER_SCHED
+        uid_t uid;
+#endif
+
 #ifdef CONFIG_FAIR_GROUP_SCHED
         /* schedulable entities of this group on each cpu */
         struct sched_entity **se;
@@ -292,6 +296,12 @@ struct task_group {
 
 #ifdef CONFIG_USER_SCHED
 
+/* Helper function to pass uid information to create_sched_user() */
+void set_tg_uid(struct user_struct *user)
+{
+        user->tg->uid = user->uid;
+}
+
 /*
  * Root task group.
  *      Every UID task group (including init_task_group aka UID-0) will
@@ -594,6 +604,8 @@ struct rq {
 #ifdef CONFIG_SCHEDSTATS
         /* latency stats */
         struct sched_info rq_sched_info;
+        unsigned long long rq_cpu_time;
+        /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */
 
         /* sys_sched_yield() stats */
         unsigned int yld_exp_empty;
@@ -711,45 +723,18 @@ static __read_mostly char *sched_feat_names[] = {
 
 #undef SCHED_FEAT
 
-static int sched_feat_open(struct inode *inode, struct file *filp)
-{
-        filp->private_data = inode->i_private;
-        return 0;
-}
-
-static ssize_t
-sched_feat_read(struct file *filp, char __user *ubuf,
-                size_t cnt, loff_t *ppos)
+static int sched_feat_show(struct seq_file *m, void *v)
 {
-        char *buf;
-        int r = 0;
-        int len = 0;
         int i;
 
         for (i = 0; sched_feat_names[i]; i++) {
-                len += strlen(sched_feat_names[i]);
-                len += 4;
-        }
-
-        buf = kmalloc(len + 2, GFP_KERNEL);
-        if (!buf)
-                return -ENOMEM;
-
-        for (i = 0; sched_feat_names[i]; i++) {
-                if (sysctl_sched_features & (1UL << i))
-                        r += sprintf(buf + r, "%s ", sched_feat_names[i]);
-                else
-                        r += sprintf(buf + r, "NO_%s ", sched_feat_names[i]);
+                if (!(sysctl_sched_features & (1UL << i)))
+                        seq_puts(m, "NO_");
+                seq_printf(m, "%s ", sched_feat_names[i]);
         }
+        seq_puts(m, "\n");
 
-        r += sprintf(buf + r, "\n");
-        WARN_ON(r >= len + 2);
-
-        r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
-
-        kfree(buf);
-
-        return r;
+        return 0;
 }
 
 static ssize_t
@@ -794,10 +779,17 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
         return cnt;
 }
 
+static int sched_feat_open(struct inode *inode, struct file *filp)
+{
+        return single_open(filp, sched_feat_show, NULL);
+}
+
 static struct file_operations sched_feat_fops = {
-        .open   = sched_feat_open,
-        .read   = sched_feat_read,
-        .write  = sched_feat_write,
+        .open           = sched_feat_open,
+        .write          = sched_feat_write,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
 };
 
 static __init int sched_init_debug(void)
@@ -1482,27 +1474,13 @@ static void
 update_group_shares_cpu(struct task_group *tg, int cpu,
                         unsigned long sd_shares, unsigned long sd_rq_weight)
 {
-        int boost = 0;
         unsigned long shares;
         unsigned long rq_weight;
 
         if (!tg->se[cpu])
                 return;
 
-        rq_weight = tg->cfs_rq[cpu]->load.weight;
-
-        /*
-         * If there are currently no tasks on the cpu pretend there is one of
-         * average load so that when a new task gets to run here it will not
-         * get delayed by group starvation.
-         */
-        if (!rq_weight) {
-                boost = 1;
-                rq_weight = NICE_0_LOAD;
-        }
-
-        if (unlikely(rq_weight > sd_rq_weight))
-                rq_weight = sd_rq_weight;
+        rq_weight = tg->cfs_rq[cpu]->rq_weight;
 
         /*
          *           \Sum shares * rq_weight
@@ -1510,7 +1488,7 @@ update_group_shares_cpu(struct task_group *tg, int cpu,
          *               \Sum rq_weight
          *
          */
-        shares = (sd_shares * rq_weight) / (sd_rq_weight + 1);
+        shares = (sd_shares * rq_weight) / sd_rq_weight;
         shares = clamp_t(unsigned long, shares, MIN_SHARES, MAX_SHARES);
 
         if (abs(shares - tg->se[cpu]->load.weight) >
@@ -1519,11 +1497,7 @@ update_group_shares_cpu(struct task_group *tg, int cpu,
                 unsigned long flags;
 
                 spin_lock_irqsave(&rq->lock, flags);
-                /*
-                 * record the actual number of shares, not the boosted amount.
-                 */
-                tg->cfs_rq[cpu]->shares = boost ? 0 : shares;
-                tg->cfs_rq[cpu]->rq_weight = rq_weight;
+                tg->cfs_rq[cpu]->shares = shares;
 
                 __set_se_shares(tg->se[cpu], shares);
                 spin_unlock_irqrestore(&rq->lock, flags);
@@ -1537,13 +1511,23 @@ update_group_shares_cpu(struct task_group *tg, int cpu,
  */
 static int tg_shares_up(struct task_group *tg, void *data)
 {
-        unsigned long rq_weight = 0;
+        unsigned long weight, rq_weight = 0;
         unsigned long shares = 0;
         struct sched_domain *sd = data;
         int i;
 
         for_each_cpu_mask(i, sd->span) {
-                rq_weight += tg->cfs_rq[i]->load.weight;
+                /*
+                 * If there are currently no tasks on the cpu pretend there
+                 * is one of average load so that when a new task gets to
+                 * run here it will not get delayed by group starvation.
+                 */
+                weight = tg->cfs_rq[i]->load.weight;
+                if (!weight)
+                        weight = NICE_0_LOAD;
+
+                tg->cfs_rq[i]->rq_weight = weight;
+                rq_weight += weight;
                 shares += tg->cfs_rq[i]->shares;
         }
 
@@ -1553,9 +1537,6 @@ static int tg_shares_up(struct task_group *tg, void *data)
         if (!sd->parent || !(sd->parent->flags & SD_LOAD_BALANCE))
                 shares = tg->shares;
 
-        if (!rq_weight)
-                rq_weight = cpus_weight(sd->span) * NICE_0_LOAD;
-
         for_each_cpu_mask(i, sd->span)
                 update_group_shares_cpu(tg, i, shares, rq_weight);
 
@@ -1620,6 +1601,39 @@ static inline void update_shares_locked(struct rq *rq, struct sched_domain *sd)
 
 #endif
 
+/*
+ * double_lock_balance - lock the busiest runqueue, this_rq is locked already.
+ */
+static int double_lock_balance(struct rq *this_rq, struct rq *busiest)
+        __releases(this_rq->lock)
+        __acquires(busiest->lock)
+        __acquires(this_rq->lock)
+{
+        int ret = 0;
+
+        if (unlikely(!irqs_disabled())) {
+                /* printk() doesn't work good under rq->lock */
+                spin_unlock(&this_rq->lock);
+                BUG_ON(1);
+        }
+        if (unlikely(!spin_trylock(&busiest->lock))) {
+                if (busiest < this_rq) {
+                        spin_unlock(&this_rq->lock);
+                        spin_lock(&busiest->lock);
+                        spin_lock_nested(&this_rq->lock, SINGLE_DEPTH_NESTING);
+                        ret = 1;
+                } else
+                        spin_lock_nested(&busiest->lock, SINGLE_DEPTH_NESTING);
+        }
+        return ret;
+}
+
+static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
+        __releases(busiest->lock)
+{
+        spin_unlock(&busiest->lock);
+        lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_);
+}
 #endif
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
@@ -2264,6 +2278,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
 
         smp_wmb();
         rq = task_rq_lock(p, &flags);
+        update_rq_clock(rq);
         old_state = p->state;
         if (!(old_state & state))
                 goto out;
@@ -2321,7 +2336,6 @@ out_activate:
                 schedstat_inc(p, se.nr_wakeups_local);
         else
                 schedstat_inc(p, se.nr_wakeups_remote);
-        update_rq_clock(rq);
         activate_task(rq, p, 1);
         success = 1;
 
@@ -2822,40 +2836,6 @@ static void double_rq_unlock(struct rq *rq1, struct rq *rq2)
 }
 
 /*
- * double_lock_balance - lock the busiest runqueue, this_rq is locked already.
- */
-static int double_lock_balance(struct rq *this_rq, struct rq *busiest)
-        __releases(this_rq->lock)
-        __acquires(busiest->lock)
-        __acquires(this_rq->lock)
-{
-        int ret = 0;
-
-        if (unlikely(!irqs_disabled())) {
-                /* printk() doesn't work good under rq->lock */
-                spin_unlock(&this_rq->lock);
-                BUG_ON(1);
-        }
-        if (unlikely(!spin_trylock(&busiest->lock))) {
-                if (busiest < this_rq) {
-                        spin_unlock(&this_rq->lock);
-                        spin_lock(&busiest->lock);
-                        spin_lock_nested(&this_rq->lock, SINGLE_DEPTH_NESTING);
-                        ret = 1;
-                } else
-                        spin_lock_nested(&busiest->lock, SINGLE_DEPTH_NESTING);
-        }
-        return ret;
-}
-
-static void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
-        __releases(busiest->lock)
-{
-        spin_unlock(&busiest->lock);
-        lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_);
-}
-
-/*
  * If dest_cpu is allowed for this process, migrate the task to it.
  * This is accomplished by forcing the cpu_allowed mask to only
  * allow dest_cpu, which will force the cpu onto dest_cpu. Then
@@ -3716,7 +3696,7 @@ out_balanced:
 static void idle_balance(int this_cpu, struct rq *this_rq)
 {
         struct sched_domain *sd;
-        int pulled_task = -1;
+        int pulled_task = 0;
         unsigned long next_balance = jiffies + HZ;
         cpumask_t tmpmask;
 
@@ -6150,7 +6130,6 @@ static int __migrate_task_irq(struct task_struct *p, int src_cpu, int dest_cpu)
 
 /*
  * Figure out where task on dead CPU should go, use force if necessary.
- * NOTE: interrupts should be disabled by the caller
  */
 static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p)
 {
@@ -6662,28 +6641,6 @@ early_initcall(migration_init);
 
 #ifdef CONFIG_SCHED_DEBUG
 
-static inline const char *sd_level_to_string(enum sched_domain_level lvl)
-{
-        switch (lvl) {
-        case SD_LV_NONE:
-                        return "NONE";
-        case SD_LV_SIBLING:
-                        return "SIBLING";
-        case SD_LV_MC:
-                        return "MC";
-        case SD_LV_CPU:
-                        return "CPU";
-        case SD_LV_NODE:
-                        return "NODE";
-        case SD_LV_ALLNODES:
-                        return "ALLNODES";
-        case SD_LV_MAX:
-                        return "MAX";
-
-        }
-        return "MAX";
-}
-
 static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
                                   cpumask_t *groupmask)
 {
@@ -6703,8 +6660,7 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
                 return -1;
         }
 
-        printk(KERN_CONT "span %s level %s\n",
-                str, sd_level_to_string(sd->level));
+        printk(KERN_CONT "span %s level %s\n", str, sd->name);
 
         if (!cpu_isset(cpu, sd->span)) {
                 printk(KERN_ERR "ERROR: domain->span does not contain "
@@ -6840,6 +6796,8 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
                                 SD_BALANCE_EXEC |
                                 SD_SHARE_CPUPOWER |
                                 SD_SHARE_PKG_RESOURCES);
+                if (nr_node_ids == 1)
+                        pflags &= ~SD_SERIALIZE;
         }
         if (~cflags & pflags)
                 return 0;
@@ -7360,13 +7318,21 @@ struct allmasks {
 };
 
 #if     NR_CPUS > 128
-#define SCHED_CPUMASK_ALLOC             1
-#define SCHED_CPUMASK_FREE(v)           kfree(v)
-#define SCHED_CPUMASK_DECLARE(v)        struct allmasks *v
+#define SCHED_CPUMASK_DECLARE(v)        struct allmasks *v
+static inline void sched_cpumask_alloc(struct allmasks **masks)
+{
+        *masks = kmalloc(sizeof(**masks), GFP_KERNEL);
+}
+static inline void sched_cpumask_free(struct allmasks *masks)
+{
+        kfree(masks);
+}
 #else
-#define SCHED_CPUMASK_ALLOC             0
-#define SCHED_CPUMASK_FREE(v)
-#define SCHED_CPUMASK_DECLARE(v)        struct allmasks _v, *v = &_v
+#define SCHED_CPUMASK_DECLARE(v)        struct allmasks _v, *v = &_v
+static inline void sched_cpumask_alloc(struct allmasks **masks)
+{ }
+static inline void sched_cpumask_free(struct allmasks *masks)
+{ }
 #endif
 
 #define SCHED_CPUMASK_VAR(v, a)         cpumask_t *v = (cpumask_t *) \
@@ -7442,9 +7408,8 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
                 return -ENOMEM;
         }
 
-#if SCHED_CPUMASK_ALLOC
         /* get space for all scratch cpumask variables */
-        allmasks = kmalloc(sizeof(*allmasks), GFP_KERNEL);
+        sched_cpumask_alloc(&allmasks);
         if (!allmasks) {
                 printk(KERN_WARNING "Cannot alloc cpumask array\n");
                 kfree(rd);
@@ -7453,7 +7418,7 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
 #endif
                 return -ENOMEM;
         }
-#endif
+
         tmpmask = (cpumask_t *)allmasks;
 
 
@@ -7707,13 +7672,13 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
                 cpu_attach_domain(sd, rd, i);
         }
 
-        SCHED_CPUMASK_FREE((void *)allmasks);
+        sched_cpumask_free(allmasks);
         return 0;
 
 #ifdef CONFIG_NUMA
 error:
         free_sched_groups(cpu_map, tmpmask);
-        SCHED_CPUMASK_FREE((void *)allmasks);
+        sched_cpumask_free(allmasks);
         kfree(rd);
         return -ENOMEM;
 #endif
@@ -7736,8 +7701,14 @@ static struct sched_domain_attr *dattr_cur;
  */
 static cpumask_t fallback_doms;
 
-void __attribute__((weak)) arch_update_cpu_topology(void)
+/*
+ * arch_update_cpu_topology lets virtualized architectures update the
+ * cpu core maps. It is supposed to return 1 if the topology changed
+ * or 0 if it stayed the same.
+ */
+int __attribute__((weak)) arch_update_cpu_topology(void)
 {
+        return 0;
 }
 
 /*
@@ -7777,8 +7748,6 @@ static void detach_destroy_domains(const cpumask_t *cpu_map)
         cpumask_t tmpmask;
         int i;
 
-        unregister_sched_domain_sysctl();
-
         for_each_cpu_mask_nr(i, *cpu_map)
                 cpu_attach_domain(NULL, &def_root_domain, i);
         synchronize_sched();
@@ -7831,17 +7800,21 @@ void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
                              struct sched_domain_attr *dattr_new)
 {
         int i, j, n;
+        int new_topology;
 
         mutex_lock(&sched_domains_mutex);
 
         /* always unregister in case we don't destroy any domains */
         unregister_sched_domain_sysctl();
 
+        /* Let architecture update cpu core mappings. */
+        new_topology = arch_update_cpu_topology();
+
         n = doms_new ? ndoms_new : 0;
 
         /* Destroy deleted domains */
         for (i = 0; i < ndoms_cur; i++) {
-                for (j = 0; j < n; j++) {
+                for (j = 0; j < n && !new_topology; j++) {
                         if (cpus_equal(doms_cur[i], doms_new[j])
                             && dattrs_equal(dattr_cur, i, dattr_new, j))
                                 goto match1;
@@ -7856,12 +7829,12 @@ match1:
                 ndoms_cur = 0;
                 doms_new = &fallback_doms;
                 cpus_andnot(doms_new[0], cpu_online_map, cpu_isolated_map);
-                dattr_new = NULL;
+                WARN_ON_ONCE(dattr_new);
         }
 
         /* Build new domains */
         for (i = 0; i < ndoms_new; i++) {
-                for (j = 0; j < ndoms_cur; j++) {
+                for (j = 0; j < ndoms_cur && !new_topology; j++) {
                         if (cpus_equal(doms_new[i], doms_cur[j])
                             && dattrs_equal(dattr_new, i, dattr_cur, j))
                                 goto match2;
@@ -8516,7 +8489,7 @@ static
 int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
 {
         struct cfs_rq *cfs_rq;
-        struct sched_entity *se, *parent_se;
+        struct sched_entity *se;
         struct rq *rq;
         int i;
 
@@ -8532,18 +8505,17 @@ int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
         for_each_possible_cpu(i) {
                 rq = cpu_rq(i);
 
-                cfs_rq = kmalloc_node(sizeof(struct cfs_rq),
-                                GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
+                cfs_rq = kzalloc_node(sizeof(struct cfs_rq),
+                                      GFP_KERNEL, cpu_to_node(i));
                 if (!cfs_rq)
                         goto err;
 
-                se = kmalloc_node(sizeof(struct sched_entity),
-                                GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
+                se = kzalloc_node(sizeof(struct sched_entity),
+                                  GFP_KERNEL, cpu_to_node(i));
                 if (!se)
                         goto err;
 
-                parent_se = parent ? parent->se[i] : NULL;
-                init_tg_cfs_entry(tg, cfs_rq, se, i, 0, parent_se);
+                init_tg_cfs_entry(tg, cfs_rq, se, i, 0, parent->se[i]);
         }
 
         return 1;
@@ -8604,7 +8576,7 @@ static
 int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
 {
         struct rt_rq *rt_rq;
-        struct sched_rt_entity *rt_se, *parent_se;
+        struct sched_rt_entity *rt_se;
         struct rq *rq;
         int i;
 
@@ -8621,18 +8593,17 @@ int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
         for_each_possible_cpu(i) {
                 rq = cpu_rq(i);
 
-                rt_rq = kmalloc_node(sizeof(struct rt_rq),
-                                GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
+                rt_rq = kzalloc_node(sizeof(struct rt_rq),
+                                     GFP_KERNEL, cpu_to_node(i));
                 if (!rt_rq)
                         goto err;
 
-                rt_se = kmalloc_node(sizeof(struct sched_rt_entity),
-                                GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
+                rt_se = kzalloc_node(sizeof(struct sched_rt_entity),
+                                     GFP_KERNEL, cpu_to_node(i));
                 if (!rt_se)
                         goto err;
 
-                parent_se = parent ? parent->rt_se[i] : NULL;
-                init_tg_rt_entry(tg, rt_rq, rt_se, i, 0, parent_se);
+                init_tg_rt_entry(tg, rt_rq, rt_se, i, 0, parent->rt_se[i]);
         }
 
         return 1;
@@ -9275,11 +9246,12 @@ struct cgroup_subsys cpu_cgroup_subsys = {
  * (balbir@in.ibm.com).
  */
 
-/* track cpu usage of a group of tasks */
+/* track cpu usage of a group of tasks and its child groups */
 struct cpuacct {
         struct cgroup_subsys_state css;
         /* cpuusage holds pointer to a u64-type object on every cpu */
         u64 *cpuusage;
+        struct cpuacct *parent;
 };
 
 struct cgroup_subsys cpuacct_subsys;
@@ -9313,6 +9285,9 @@ static struct cgroup_subsys_state *cpuacct_create(
                 return ERR_PTR(-ENOMEM);
         }
 
+        if (cgrp->parent)
+                ca->parent = cgroup_ca(cgrp->parent);
+
         return &ca->css;
 }
 
@@ -9326,6 +9301,41 @@ cpuacct_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
         kfree(ca);
 }
 
+static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu)
+{
+        u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
+        u64 data;
+
+#ifndef CONFIG_64BIT
+        /*
+         * Take rq->lock to make 64-bit read safe on 32-bit platforms.
+         */
+        spin_lock_irq(&cpu_rq(cpu)->lock);
+        data = *cpuusage;
+        spin_unlock_irq(&cpu_rq(cpu)->lock);
+#else
+        data = *cpuusage;
+#endif
+
+        return data;
+}
+
+static void cpuacct_cpuusage_write(struct cpuacct *ca, int cpu, u64 val)
+{
+        u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
+
+#ifndef CONFIG_64BIT
+        /*
+         * Take rq->lock to make 64-bit write safe on 32-bit platforms.
+         */
+        spin_lock_irq(&cpu_rq(cpu)->lock);
+        *cpuusage = val;
+        spin_unlock_irq(&cpu_rq(cpu)->lock);
+#else
+        *cpuusage = val;
+#endif
+}
+
 /* return total cpu usage (in nanoseconds) of a group */
 static u64 cpuusage_read(struct cgroup *cgrp, struct cftype *cft)
 {
@@ -9333,17 +9343,8 @@ static u64 cpuusage_read(struct cgroup *cgrp, struct cftype *cft)
         u64 totalcpuusage = 0;
         int i;
 
-        for_each_possible_cpu(i) {
-                u64 *cpuusage = percpu_ptr(ca->cpuusage, i);
-
-                /*
-                 * Take rq->lock to make 64-bit addition safe on 32-bit
-                 * platforms.
-                 */
-                spin_lock_irq(&cpu_rq(i)->lock);
-                totalcpuusage += *cpuusage;
-                spin_unlock_irq(&cpu_rq(i)->lock);
-        }
+        for_each_present_cpu(i)
+                totalcpuusage += cpuacct_cpuusage_read(ca, i);
 
         return totalcpuusage;
 }
@@ -9360,23 +9361,39 @@ static int cpuusage_write(struct cgroup *cgrp, struct cftype *cftype,
                 goto out;
         }
 
-        for_each_possible_cpu(i) {
-                u64 *cpuusage = percpu_ptr(ca->cpuusage, i);
+        for_each_present_cpu(i)
+                cpuacct_cpuusage_write(ca, i, 0);
 
-                spin_lock_irq(&cpu_rq(i)->lock);
-                *cpuusage = 0;
-                spin_unlock_irq(&cpu_rq(i)->lock);
-        }
 out:
         return err;
 }
 
+static int cpuacct_percpu_seq_read(struct cgroup *cgroup, struct cftype *cft,
+                                   struct seq_file *m)
+{
+        struct cpuacct *ca = cgroup_ca(cgroup);
+        u64 percpu;
+        int i;
+
+        for_each_present_cpu(i) {
+                percpu = cpuacct_cpuusage_read(ca, i);
+                seq_printf(m, "%llu ", (unsigned long long) percpu);
+        }
+        seq_printf(m, "\n");
+        return 0;
+}
+
 static struct cftype files[] = {
         {
                 .name = "usage",
                 .read_u64 = cpuusage_read,
                 .write_u64 = cpuusage_write,
         },
+        {
+                .name = "usage_percpu",
+                .read_seq_string = cpuacct_percpu_seq_read,
+        },
+
 };
 
 static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
@@ -9392,14 +9409,16 @@ static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
 static void cpuacct_charge(struct task_struct *tsk, u64 cputime)
 {
         struct cpuacct *ca;
+        int cpu;
 
         if (!cpuacct_subsys.active)
                 return;
 
+        cpu = task_cpu(tsk);
         ca = task_ca(tsk);
-        if (ca) {
-                u64 *cpuusage = percpu_ptr(ca->cpuusage, task_cpu(tsk));
 
+        for (; ca; ca = ca->parent) {
+                u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
                 *cpuusage += cputime;
         }
 }
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 26ed8e3d1c15..4293cfa9681d 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -53,6 +53,40 @@ static unsigned long nsec_low(unsigned long long nsec)
 
 #define SPLIT_NS(x) nsec_high(x), nsec_low(x)
 
+#ifdef CONFIG_FAIR_GROUP_SCHED
+static void print_cfs_group_stats(struct seq_file *m, int cpu,
+                struct task_group *tg)
+{
+        struct sched_entity *se = tg->se[cpu];
+        if (!se)
+                return;
+
+#define P(F) \
+        SEQ_printf(m, "  .%-30s: %lld\n", #F, (long long)F)
+#define PN(F) \
+        SEQ_printf(m, "  .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
+
+        PN(se->exec_start);
+        PN(se->vruntime);
+        PN(se->sum_exec_runtime);
+#ifdef CONFIG_SCHEDSTATS
+        PN(se->wait_start);
+        PN(se->sleep_start);
+        PN(se->block_start);
+        PN(se->sleep_max);
+        PN(se->block_max);
+        PN(se->exec_max);
+        PN(se->slice_max);
+        PN(se->wait_max);
+        PN(se->wait_sum);
+        P(se->wait_count);
+#endif
+        P(se->load.weight);
+#undef PN
+#undef P
+}
+#endif
+
 static void
 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
 {
@@ -121,20 +155,19 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 
 #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
         char path[128] = "";
-        struct cgroup *cgroup = NULL;
         struct task_group *tg = cfs_rq->tg;
 
-        if (tg)
-                cgroup = tg->css.cgroup;
-
-        if (cgroup)
-                cgroup_path(cgroup, path, sizeof(path));
+        cgroup_path(tg->css.cgroup, path, sizeof(path));
 
         SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path);
+#elif defined(CONFIG_USER_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
+        {
+                uid_t uid = cfs_rq->tg->uid;
+                SEQ_printf(m, "\ncfs_rq[%d] for UID: %u\n", cpu, uid);
+        }
 #else
         SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
 #endif
-
         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "exec_clock",
                         SPLIT_NS(cfs_rq->exec_clock));
 
@@ -168,6 +201,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 #ifdef CONFIG_SMP
         SEQ_printf(m, "  .%-30s: %lu\n", "shares", cfs_rq->shares);
 #endif
+        print_cfs_group_stats(m, cpu, cfs_rq->tg);
 #endif
 }
 
@@ -175,14 +209,9 @@ void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
 {
 #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_RT_GROUP_SCHED)
         char path[128] = "";
-        struct cgroup *cgroup = NULL;
         struct task_group *tg = rt_rq->tg;
 
-        if (tg)
-                cgroup = tg->css.cgroup;
-
-        if (cgroup)
-                cgroup_path(cgroup, path, sizeof(path));
+        cgroup_path(tg->css.cgroup, path, sizeof(path));
 
         SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, path);
 #else
@@ -272,7 +301,7 @@ static int sched_debug_show(struct seq_file *m, void *v)
         u64 now = ktime_to_ns(ktime_get());
         int cpu;
 
-        SEQ_printf(m, "Sched Debug Version: v0.07, %s %.*s\n",
+        SEQ_printf(m, "Sched Debug Version: v0.08, %s %.*s\n",
                 init_utsname()->release,
                 (int)strcspn(init_utsname()->version, " "),
                 init_utsname()->version);
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 98345e45b059..5ad4440f0fc4 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -492,6 +492,8 @@ static void update_curr(struct cfs_rq *cfs_rq)
          * overflow on 32 bits):
          */
         delta_exec = (unsigned long)(now - curr->exec_start);
+        if (!delta_exec)
+                return;
 
         __update_curr(cfs_rq, curr, delta_exec);
         curr->exec_start = now;
@@ -1345,12 +1347,11 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int sync)
 {
         struct task_struct *curr = rq->curr;
         struct sched_entity *se = &curr->se, *pse = &p->se;
+        struct cfs_rq *cfs_rq = task_cfs_rq(curr);
 
-        if (unlikely(rt_prio(p->prio))) {
-                struct cfs_rq *cfs_rq = task_cfs_rq(curr);
+        update_curr(cfs_rq);
 
-                update_rq_clock(rq);
-                update_curr(cfs_rq);
+        if (unlikely(rt_prio(p->prio))) {
                 resched_task(curr);
                 return;
         }
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index d9ba9d5f99d6..51d2af3e6191 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -77,7 +77,7 @@ static inline u64 sched_rt_period(struct rt_rq *rt_rq)
 }
 
 #define for_each_leaf_rt_rq(rt_rq, rq) \
-        list_for_each_entry(rt_rq, &rq->leaf_rt_rq_list, leaf_rt_rq_list)
+        list_for_each_entry_rcu(rt_rq, &rq->leaf_rt_rq_list, leaf_rt_rq_list)
 
 static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
 {
@@ -537,13 +537,13 @@ static void update_curr_rt(struct rq *rq)
         for_each_sched_rt_entity(rt_se) {
                 rt_rq = rt_rq_of_se(rt_se);
 
-                spin_lock(&rt_rq->rt_runtime_lock);
                 if (sched_rt_runtime(rt_rq) != RUNTIME_INF) {
+                        spin_lock(&rt_rq->rt_runtime_lock);
                         rt_rq->rt_time += delta_exec;
                         if (sched_rt_runtime_exceeded(rt_rq))
                                 resched_task(curr);
+                        spin_unlock(&rt_rq->rt_runtime_lock);
                 }
-                spin_unlock(&rt_rq->rt_runtime_lock);
         }
 }
 
@@ -909,9 +909,6 @@ static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
 /* Only try algorithms three times */
 #define RT_MAX_TRIES 3
 
-static int double_lock_balance(struct rq *this_rq, struct rq *busiest);
-static void double_unlock_balance(struct rq *this_rq, struct rq *busiest);
-
 static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep);
 
 static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu)
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index 7dbf72a2b02c..3b01098164c8 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -31,7 +31,7 @@ static int show_schedstat(struct seq_file *seq, void *v)
                     rq->yld_act_empty, rq->yld_exp_empty, rq->yld_count,
                     rq->sched_switch, rq->sched_count, rq->sched_goidle,
                     rq->ttwu_count, rq->ttwu_local,
-                    rq->rq_sched_info.cpu_time,
+                    rq->rq_cpu_time,
                     rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
 
                 seq_printf(seq, "\n");
@@ -123,7 +123,7 @@ static inline void
 rq_sched_info_depart(struct rq *rq, unsigned long long delta)
 {
         if (rq)
-                rq->rq_sched_info.cpu_time += delta;
+                rq->rq_cpu_time += delta;
 }
 
 static inline void
@@ -236,7 +236,6 @@ static inline void sched_info_depart(struct task_struct *t)
         unsigned long long delta = task_rq(t)->clock -
                                         t->sched_info.last_arrival;
 
-        t->sched_info.cpu_time += delta;
         rq_sched_info_depart(task_rq(t), delta);
 
         if (t->state == TASK_RUNNING)
diff --git a/kernel/user.c b/kernel/user.c
index 6608a3d8ca61..477b6660f447 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -104,6 +104,8 @@ static int sched_create_user(struct user_struct *up)
         if (IS_ERR(up->tg))
                 rc = -ENOMEM;
 
+        set_tg_uid(up);
+
         return rc;
 }