[GIT PULL] scheduler changes for v5.5

[Ingo Molnar]

Linus,

Please pull the latest sched-core-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-core-for-linus

   # HEAD: de881a341c4143650fa50ce95cf450a5c94faa9f Merge branch 'sched/rt' into sched/core, to pick up commit

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.

 Thanks,

	Ingo

------------------>
Frederic Weisbecker (22):
      sched/cputime: Rename vtime_account_system() to vtime_account_kernel()
      sched/cputime: Spare a seqcount lock/unlock cycle on context switch
      sched/vtime: Record CPU under seqcount for kcpustat needs
      sched/cputime: Add vtime idle task state
      sched/cputime: Add vtime guest task state
      context_tracking: Remove context_tracking_active()
      context_tracking: Rename context_tracking_is_enabled() => context_tracking_enabled()
      context_tracking: Rename context_tracking_is_cpu_enabled() to context_tracking_enabled_this_cpu()
      context_tracking: Introduce context_tracking_enabled_cpu()
      sched/vtime: Rename vtime_accounting_cpu_enabled() to vtime_accounting_enabled_this_cpu()
      sched/vtime: Introduce vtime_accounting_enabled_cpu()
      context_tracking: Check static key on context_tracking_enabled_*cpu()
      sched/kcpustat: Introduce vtime-aware kcpustat accessor for CPUTIME_SYSTEM
      procfs: Use vtime aware kcpustat accessor to fetch CPUTIME_SYSTEM
      cpufreq: Use vtime aware kcpustat accessor to fetch CPUTIME_SYSTEM
      leds: Use vtime aware kcpustat accessor to fetch CPUTIME_SYSTEM
      sched/cputime: Support other fields on kcpustat_field()
      sched/vtime: Bring up complete kcpustat accessor
      procfs: Use all-in-one vtime aware kcpustat accessor
      cpufreq: Use vtime aware kcpustat accessors for user time
      leds: Use all-in-one vtime aware kcpustat accessor
      rackmeter: Use vtime aware kcpustat accessor

Patrick Bellasi (1):
      sched/fair/util_est: Implement faster ramp-up EWMA on utilization increases

Peter Zijlstra (6):
      sched/fair: Better document newidle_balance()
      sched/core: Make pick_next_task_idle() more consistent
      sched/core: Optimize pick_next_task()
      sched/core: Simplify sched_class::pick_next_task()
      sched/fair: Use mul_u32_u32()
      sched/core: Further clarify sched_class::set_next_task()

Srivatsa S. Bhat (VMware) (1):
      sched/Kconfig: Fix spelling mistake in user-visible help text

Valentin Schneider (2):
      sched/topology: Don't set SD_BALANCE_WAKE on cpuset domain relax
      sched/uclamp: Fix overzealous type replacement

Vincent Guittot (14):
      sched/fair: Clean up asym packing
      sched/fair: Rename sg_lb_stats::sum_nr_running to sum_h_nr_running
      sched/fair: Remove meaningless imbalance calculation
      sched/fair: Rework load_balance()
      sched/fair: Use rq->nr_running when balancing load
      sched/fair: Use load instead of runnable load in load_balance()
      sched/fair: Spread out tasks evenly when not overloaded
      sched/fair: Use utilization to select misfit task
      sched/fair: Use load instead of runnable load in wakeup path
      sched/fair: Optimize find_idlest_group()
      sched/fair: Rework find_idlest_group()
      sched/fair: Fix rework of find_idlest_group()
      sched/fair: Add comments for group_type and balancing at SD_NUMA level
      sched/cpufreq: Move the cfs_rq_util_change() call to cpufreq_update_util()


 arch/ia64/kernel/time.c                 |    4 +-
 arch/powerpc/kernel/time.c              |    6 +-
 arch/s390/kernel/vtime.c                |    4 +-
 arch/x86/entry/calling.h                |    2 +-
 drivers/cpufreq/cpufreq.c               |   17 +-
 drivers/cpufreq/cpufreq_governor.c      |    6 +-
 drivers/leds/trigger/ledtrig-activity.c |   14 +-
 drivers/macintosh/rack-meter.c          |    7 +-
 fs/proc/stat.c                          |   56 +-
 include/linux/context_tracking.h        |   30 +-
 include/linux/context_tracking_state.h  |   21 +-
 include/linux/kernel_stat.h             |   18 +
 include/linux/sched.h                   |    9 +-
 include/linux/tick.h                    |    2 +-
 include/linux/vtime.h                   |   59 +-
 kernel/Kconfig.preempt                  |    2 +-
 kernel/context_tracking.c               |    6 +-
 kernel/sched/core.c                     |   18 +-
 kernel/sched/cputime.c                  |  288 ++++++-
 kernel/sched/deadline.c                 |   12 +-
 kernel/sched/fair.c                     | 1437 +++++++++++++++++++------------
 kernel/sched/features.h                 |    1 +
 kernel/sched/idle.c                     |   10 +-
 kernel/sched/rt.c                       |   12 +-
 kernel/sched/sched.h                    |   25 +-
 kernel/sched/stop_task.c                |    9 +-
 kernel/sched/topology.c                 |    9 +-
 kernel/time/tick-sched.c                |    2 +-
 28 files changed, 1331 insertions(+), 755 deletions(-)