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: (27 commits)
  sched: Use correct macro to display sched_child_runs_first in /proc/sched_debug
  sched: No need for bootmem special cases
  sched: Revert nohz_ratelimit() for now
  sched: Reduce update_group_power() calls
  sched: Update rq->clock for nohz balanced cpus
  sched: Fix spelling of sibling
  sched, cpuset: Drop __cpuexit from cpu hotplug callbacks
  sched: Fix the racy usage of thread_group_cputimer() in fastpath_timer_check()
  sched: run_posix_cpu_timers: Don't check ->exit_state, use lock_task_sighand()
  sched: thread_group_cputime: Simplify, document the "alive" check
  sched: Remove the obsolete exit_state/signal hacks
  sched: task_tick_rt: Remove the obsolete ->signal != NULL check
  sched: __sched_setscheduler: Read the RLIMIT_RTPRIO value lockless
  sched: Fix comments to make them DocBook happy
  sched: Fix fix_small_capacity
  powerpc: Exclude arch_sd_sibiling_asym_packing() on UP
  powerpc: Enable asymmetric SMT scheduling on POWER7
  sched: Add asymmetric group packing option for sibling domain
  sched: Fix capacity calculations for SMT4
  sched: Change nohz idle load balancing logic to push model
  ...

5 files changed, 62 insertions, 31 deletions

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index e287863ac053..de6b1722cdca 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -48,6 +48,31 @@ extern ssize_t arch_cpu_release(const char *, size_t);
 #endif
 struct notifier_block;
 
+/*
+ * CPU notifier priorities.
+ */
+enum {
+        /*
+         * SCHED_ACTIVE marks a cpu which is coming up active during
+         * CPU_ONLINE and CPU_DOWN_FAILED and must be the first
+         * notifier.  CPUSET_ACTIVE adjusts cpuset according to
+         * cpu_active mask right after SCHED_ACTIVE.  During
+         * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are
+         * ordered in the similar way.
+         *
+         * This ordering guarantees consistent cpu_active mask and
+         * migration behavior to all cpu notifiers.
+         */
+        CPU_PRI_SCHED_ACTIVE    = INT_MAX,
+        CPU_PRI_CPUSET_ACTIVE   = INT_MAX - 1,
+        CPU_PRI_SCHED_INACTIVE  = INT_MIN + 1,
+        CPU_PRI_CPUSET_INACTIVE = INT_MIN,
+
+        /* migration should happen before other stuff but after perf */
+        CPU_PRI_PERF            = 20,
+        CPU_PRI_MIGRATION       = 10,
+};
+
 #ifdef CONFIG_SMP
 /* Need to know about CPUs going up/down? */
 #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
index 457ed765a116..f20eb8f16025 100644
--- a/include/linux/cpuset.h
+++ b/include/linux/cpuset.h
@@ -20,6 +20,7 @@ extern int number_of_cpusets;	/* How many cpusets are defined in system? */
 
 extern int cpuset_init(void);
 extern void cpuset_init_smp(void);
+extern void cpuset_update_active_cpus(void);
 extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
 extern int cpuset_cpus_allowed_fallback(struct task_struct *p);
 extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
@@ -132,6 +133,11 @@ static inline void set_mems_allowed(nodemask_t nodemask)
 static inline int cpuset_init(void) { return 0; }
 static inline void cpuset_init_smp(void) {}
 
+static inline void cpuset_update_active_cpus(void)
+{
+        partition_sched_domains(1, NULL, NULL);
+}
+
 static inline void cpuset_cpus_allowed(struct task_struct *p,
                                        struct cpumask *mask)
 {
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 937495c25073..716f99b682c1 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1067,7 +1067,7 @@ static inline void perf_event_disable(struct perf_event *event)		{ }
 #define perf_cpu_notifier(fn)                                   \
 do {                                                            \
         static struct notifier_block fn##_nb __cpuinitdata =    \
-                { .notifier_call = fn, .priority = 20 };        \
+                { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
         fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE,             \
                 (void *)(unsigned long)smp_processor_id());     \
         fn(&fn##_nb, (unsigned long)CPU_STARTING,               \
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3992f50de614..9591907c4f79 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -272,19 +272,10 @@ extern int runqueue_is_locked(int cpu);
 
 extern cpumask_var_t nohz_cpu_mask;
 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
-extern int select_nohz_load_balancer(int cpu);
-extern int get_nohz_load_balancer(void);
-extern int nohz_ratelimit(int cpu);
+extern void select_nohz_load_balancer(int stop_tick);
+extern int get_nohz_timer_target(void);
 #else
-static inline int select_nohz_load_balancer(int cpu)
-{
-        return 0;
-}
-
-static inline int nohz_ratelimit(int cpu)
-{
-        return 0;
-}
+static inline void select_nohz_load_balancer(int stop_tick) { }
 #endif
 
 /*
@@ -801,7 +792,7 @@ enum cpu_idle_type {
 #define SD_POWERSAVINGS_BALANCE 0x0100  /* Balance for power savings */
 #define SD_SHARE_PKG_RESOURCES  0x0200  /* Domain members share cpu pkg resources */
 #define SD_SERIALIZE            0x0400  /* Only a single load balancing instance */
-
+#define SD_ASYM_PACKING         0x0800  /* Place busy groups earlier in the domain */
 #define SD_PREFER_SIBLING       0x1000  /* Prefer to place tasks in a sibling domain */
 
 enum powersavings_balance_level {
@@ -836,6 +827,8 @@ static inline int sd_balance_for_package_power(void)
         return SD_PREFER_SIBLING;
 }
 
+extern int __weak arch_sd_sibiling_asym_packing(void);
+
 /*
  * Optimise SD flags for power savings:
  * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
@@ -857,7 +850,7 @@ struct sched_group {
          * CPU power of this group, SCHED_LOAD_SCALE being max power for a
          * single CPU.
          */
-        unsigned int cpu_power;
+        unsigned int cpu_power, cpu_power_orig;
 
         /*
          * The CPUs this group covers.
@@ -1693,6 +1686,7 @@ extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *
 #define PF_EXITING      0x00000004      /* getting shut down */
 #define PF_EXITPIDONE   0x00000008      /* pi exit done on shut down */
 #define PF_VCPU         0x00000010      /* I'm a virtual CPU */
+#define PF_WQ_WORKER    0x00000020      /* I'm a workqueue worker */
 #define PF_FORKNOEXEC   0x00000040      /* forked but didn't exec */
 #define PF_MCE_PROCESS  0x00000080      /* process policy on mce errors */
 #define PF_SUPERPRIV    0x00000100      /* used super-user privileges */
@@ -1787,20 +1781,23 @@ static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
 #endif
 
 /*
- * Architectures can set this to 1 if they have specified
- * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
- * but then during bootup it turns out that sched_clock()
- * is reliable after all:
+ * Do not use outside of architecture code which knows its limitations.
+ *
+ * sched_clock() has no promise of monotonicity or bounded drift between
+ * CPUs, use (which you should not) requires disabling IRQs.
+ *
+ * Please use one of the three interfaces below.
  */
-#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
-extern int sched_clock_stable;
-#endif
-
-/* ftrace calls sched_clock() directly */
 extern unsigned long long notrace sched_clock(void);
+/*
+ * See the comment in kernel/sched_clock.c
+ */
+extern u64 cpu_clock(int cpu);
+extern u64 local_clock(void);
+extern u64 sched_clock_cpu(int cpu);
+
 
 extern void sched_clock_init(void);
-extern u64 sched_clock_cpu(int cpu);
 
 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
 static inline void sched_clock_tick(void)
@@ -1815,17 +1812,19 @@ static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
 {
 }
 #else
+/*
+ * Architectures can set this to 1 if they have specified
+ * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
+ * but then during bootup it turns out that sched_clock()
+ * is reliable after all:
+ */
+extern int sched_clock_stable;
+
 extern void sched_clock_tick(void);
 extern void sched_clock_idle_sleep_event(void);
 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
 #endif
 
-/*
- * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
- * clock constructed from sched_clock():
- */
-extern unsigned long long cpu_clock(int cpu);
-
 extern unsigned long long
 task_sched_runtime(struct task_struct *task);
 extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
diff --git a/include/linux/topology.h b/include/linux/topology.h
index c44df50a05ab..b572e432d2f3 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -103,6 +103,7 @@ int arch_update_cpu_topology(void);
                                 | 1*SD_SHARE_PKG_RESOURCES              \
                                 | 0*SD_SERIALIZE                        \
                                 | 0*SD_PREFER_SIBLING                   \
+                                | arch_sd_sibling_asym_packing()        \
                                 ,                                       \
         .last_balance           = jiffies,                              \
         .balance_interval       = 1,                                    \