From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 1 Sep 2015 03:26:22 +0000 (-0700)
Subject: Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel... 
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a1d8561172f369ba56d636df49a6b4d6d77e2123;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

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

Pull scheduler updates from Ingo Molnar:
 "The biggest change in this cycle is the rewrite of the main SMP load
  balancing metric: the CPU load/utilization.  The main goal was to make
  the metric more precise and more representative - see the changelog of
  this commit for the gory details:

    9d89c257dfb9 ("sched/fair: Rewrite runnable load and utilization average tracking")

  It is done in a way that significantly reduces complexity of the code:

    5 files changed, 249 insertions(+), 494 deletions(-)

  and the performance testing results are encouraging.  Nevertheless we
  need to keep an eye on potential regressions, since this potentially
  affects every SMP workload in existence.

  This work comes from Yuyang Du.

  Other changes:

   - SCHED_DL updates.  (Andrea Parri)

   - Simplify architecture callbacks by removing finish_arch_switch().
     (Peter Zijlstra et al)

   - cputime accounting: guarantee stime + utime == rtime.  (Peter
     Zijlstra)

   - optimize idle CPU wakeups some more - inspired by Facebook server
     loads.  (Mike Galbraith)

   - stop_machine fixes and updates.  (Oleg Nesterov)

   - Introduce the 'trace_sched_waking' tracepoint.  (Peter Zijlstra)

   - sched/numa tweaks.  (Srikar Dronamraju)

   - misc fixes and small cleanups"

* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (44 commits)
  sched/deadline: Fix comment in enqueue_task_dl()
  sched/deadline: Fix comment in push_dl_tasks()
  sched: Change the sched_class::set_cpus_allowed() calling context
  sched: Make sched_class::set_cpus_allowed() unconditional
  sched: Fix a race between __kthread_bind() and sched_setaffinity()
  sched: Ensure a task has a non-normalized vruntime when returning back to CFS
  sched/numa: Fix NUMA_DIRECT topology identification
  tile: Reorganize _switch_to()
  sched, sparc32: Update scheduler comments in copy_thread()
  sched: Remove finish_arch_switch()
  sched, tile: Remove finish_arch_switch
  sched, sh: Fold finish_arch_switch() into switch_to()
  sched, score: Remove finish_arch_switch()
  sched, avr32: Remove finish_arch_switch()
  sched, MIPS: Get rid of finish_arch_switch()
  sched, arm: Remove finish_arch_switch()
  sched/fair: Clean up load average references
  sched/fair: Provide runnable_load_avg back to cfs_rq
  sched/fair: Remove task and group entity load when they are dead
  sched/fair: Init cfs_rq's sched_entity load average
  ...
---

a1d8561172f369ba56d636df49a6b4d6d77e2123
diff --cc kernel/cpu.c
index 3c91a3fdfce5,664ce5299334..82cf9dff4295
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@@ -394,15 -392,10 +394,15 @@@ static int _cpu_down(unsigned int cpu, 
  	smpboot_park_threads(cpu);
  
  	/*
 -	 * So now all preempt/rcu users must observe !cpu_active().
 +	 * Prevent irq alloc/free while the dying cpu reorganizes the
 +	 * interrupt affinities.
  	 */
 +	irq_lock_sparse();
  
 +	/*
 +	 * So now all preempt/rcu users must observe !cpu_active().
 +	 */
- 	err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu));
+ 	err = stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu));
  	if (err) {
  		/* CPU didn't die: tell everyone.  Can't complain. */
  		cpu_notify_nofail(CPU_DOWN_FAILED | mod, hcpu);