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

Pull scheduler updates from Ingo Molnar:
 "The biggest changes in this cycle were:

   - Make kcpustat vtime aware (Frederic Weisbecker)

   - Rework the CFS load_balance() logic (Vincent Guittot)

   - Misc cleanups, smaller enhancements, fixes.

  The load-balancing rework is the most intrusive change: it replaces
  the old heuristics that have become less meaningful after the
  introduction of the PELT metrics, with a grounds-up load-balancing
  algorithm.

  As such it's not really an iterative series, but replaces the old
  load-balancing logic with the new one. We hope there are no
  performance regressions left - but statistically it's highly probable
  that there *is* going to be some workload that is hurting from these
  chnages. If so then we'd prefer to have a look at that workload and
  fix its scheduling, instead of reverting the changes"

* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (46 commits)
  rackmeter: Use vtime aware kcpustat accessor
  leds: Use all-in-one vtime aware kcpustat accessor
  cpufreq: Use vtime aware kcpustat accessors for user time
  procfs: Use all-in-one vtime aware kcpustat accessor
  sched/vtime: Bring up complete kcpustat accessor
  sched/cputime: Support other fields on kcpustat_field()
  sched/cpufreq: Move the cfs_rq_util_change() call to cpufreq_update_util()
  sched/fair: Add comments for group_type and balancing at SD_NUMA level
  sched/fair: Fix rework of find_idlest_group()
  sched/uclamp: Fix overzealous type replacement
  sched/Kconfig: Fix spelling mistake in user-visible help text
  sched/core: Further clarify sched_class::set_next_task()
  sched/fair: Use mul_u32_u32()
  sched/core: Simplify sched_class::pick_next_task()
  sched/core: Optimize pick_next_task()
  sched/core: Make pick_next_task_idle() more consistent
  sched/fair: Better document newidle_balance()
  leds: Use vtime aware kcpustat accessor to fetch CPUTIME_SYSTEM
  cpufreq: Use vtime aware kcpustat accessor to fetch CPUTIME_SYSTEM
  procfs: Use vtime aware kcpustat accessor to fetch CPUTIME_SYSTEM
  ...

1 files changed, 30 insertions, 29 deletions

diff --git a/include/linux/vtime.h b/include/linux/vtime.h
index a26ed10a4eac..2cdeca062db3 100644
--- a/include/linux/vtime.h
+++ b/include/linux/vtime.h
@@ -11,11 +11,15 @@
 struct task_struct;
 
 /*
- * vtime_accounting_cpu_enabled() definitions/declarations
+ * vtime_accounting_enabled_this_cpu() definitions/declarations
  */
 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE)
-static inline bool vtime_accounting_cpu_enabled(void) { return true; }
+
+static inline bool vtime_accounting_enabled_this_cpu(void) { return true; }
+extern void vtime_task_switch(struct task_struct *prev);
+
 #elif defined(CONFIG_VIRT_CPU_ACCOUNTING_GEN)
+
 /*
  * Checks if vtime is enabled on some CPU. Cputime readers want to be careful
  * in that case and compute the tickless cputime.
@@ -24,46 +28,43 @@ static inline bool vtime_accounting_cpu_enabled(void) { return true; }
  */
 static inline bool vtime_accounting_enabled(void)
 {
-	return context_tracking_is_enabled();
+	return context_tracking_enabled();
 }
 
-static inline bool vtime_accounting_cpu_enabled(void)
+static inline bool vtime_accounting_enabled_cpu(int cpu)
 {
-	if (vtime_accounting_enabled()) {
-		if (context_tracking_cpu_is_enabled())
-			return true;
-	}
-
-	return false;
+	return context_tracking_enabled_cpu(cpu);
 }
-#else /* !CONFIG_VIRT_CPU_ACCOUNTING */
-static inline bool vtime_accounting_cpu_enabled(void) { return false; }
-#endif
 
+static inline bool vtime_accounting_enabled_this_cpu(void)
+{
+	return context_tracking_enabled_this_cpu();
+}
 
-/*
- * Common vtime APIs
- */
-#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+extern void vtime_task_switch_generic(struct task_struct *prev);
 
-#ifdef __ARCH_HAS_VTIME_TASK_SWITCH
-extern void vtime_task_switch(struct task_struct *prev);
-#else
-extern void vtime_common_task_switch(struct task_struct *prev);
 static inline void vtime_task_switch(struct task_struct *prev)
 {
-	if (vtime_accounting_cpu_enabled())
-		vtime_common_task_switch(prev);
+	if (vtime_accounting_enabled_this_cpu())
+		vtime_task_switch_generic(prev);
 }
-#endif /* __ARCH_HAS_VTIME_TASK_SWITCH */
-
-extern void vtime_account_system(struct task_struct *tsk);
-extern void vtime_account_idle(struct task_struct *tsk);
 
 #else /* !CONFIG_VIRT_CPU_ACCOUNTING */
 
+static inline bool vtime_accounting_enabled_cpu(int cpu) {return false; }
+static inline bool vtime_accounting_enabled_this_cpu(void) { return false; }
 static inline void vtime_task_switch(struct task_struct *prev) { }
-static inline void vtime_account_system(struct task_struct *tsk) { }
+
+#endif
+
+/*
+ * Common vtime APIs
+ */
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+extern void vtime_account_kernel(struct task_struct *tsk);
+extern void vtime_account_idle(struct task_struct *tsk);
+#else /* !CONFIG_VIRT_CPU_ACCOUNTING */
+static inline void vtime_account_kernel(struct task_struct *tsk) { }
 #endif /* !CONFIG_VIRT_CPU_ACCOUNTING */
 
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
@@ -86,7 +87,7 @@ extern void vtime_account_irq_enter(struct task_struct *tsk);
 static inline void vtime_account_irq_exit(struct task_struct *tsk)
 {
 	/* On hard|softirq exit we always account to hard|softirq cputime */
-	vtime_account_system(tsk);
+	vtime_account_kernel(tsk);
 }
 extern void vtime_flush(struct task_struct *tsk);
 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */