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* [GIT PULL] timers/nohz updates for 3.12
@ 2013-08-05 19:01 Frederic Weisbecker
  2013-08-12 18:44 ` Ingo Molnar
  0 siblings, 1 reply; 7+ messages in thread
From: Frederic Weisbecker @ 2013-08-05 19:01 UTC (permalink / raw)
  To: Ingo Molnar
  Cc: LKML, Frederic Weisbecker, Steven Rostedt, Paul E. McKenney,
	Thomas Gleixner, Peter Zijlstra, Borislav Petkov, Li Zhong,
	Mike Galbraith, Kevin Hilman, Martin Schwidefsky, Heiko Carstens,
	Geert Uytterhoeven, Alex Shi, Paul Turner, Vincent Guittot

Ingo,

Please pull the timers/nohz branch that can be found at:

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	timers/nohz

It mostly contains fixes and full dynticks off-case optimizations. I believe that
distros want to enable this feature so it seems important to optimize the case
where the "nohz_full=" parameter is empty. ie: I'm trying to remove any performance
regression that comes with NO_HZ_FULL=y when the feature is not used.

This patchset improves the current situation a lot (off-case appears to be around 11% faster
with hackbench, although I guess it may vary depending on the configuration but it should be
significantly faster in any case) now there is still some work to do: I can still observe a
remaining loss of 1.6% throughput seen with hackbench compared to CONFIG_NO_HZ_FULL=n

Thanks,
	Frederic
---

Frederic Weisbecker (23):
      sched: Consolidate open coded preemptible() checks
      context_tracing: Fix guest accounting with native vtime
      vtime: Update a few comments
      context_tracking: Fix runtime CPU off-case
      nohz: Only enable context tracking on full dynticks CPUs
      context_tracking: Remove full dynticks' hacky dependency on wide context tracking
      context_tracking: Ground setup for static key use
      context_tracking: Optimize main APIs off case with static key
      context_tracking: Optimize guest APIs off case with static key
      context_tracking: Optimize context switch off case with static keys
      context_tracking: User/kernel broundary cross trace events
      vtime: Remove a few unneeded generic vtime state checks
      vtime: Fix racy cputime delta update
      context_tracking: Split low level state headers
      hardirq: Split preempt count mask definitions
      m68k: hardirq_count() only need preempt_mask.h
      vtime: Describe overriden functions in dedicated arch headers
      vtime: Optimize full dynticks accounting off case with static keys
      vtime: Always scale generic vtime accounting results
      vtime: Always debug check snapshot source _before_ updating it
      nohz: Rename a few state variables
      nohz: Optimize full dynticks state checks with static keys
      nohz: Optimize full dynticks's sched hooks with static keys


 arch/ia64/include/asm/Kbuild            |    1 +
 arch/m68k/include/asm/irqflags.h        |    2 +-
 arch/powerpc/include/asm/Kbuild         |    1 +
 arch/s390/include/asm/cputime.h         |    3 -
 arch/s390/include/asm/vtime.h           |    7 ++
 arch/s390/kernel/vtime.c                |    1 +
 include/linux/context_tracking.h        |  120 +++++++++++++++--------------
 include/linux/context_tracking_state.h  |   39 +++++++++
 include/linux/hardirq.h                 |  117 +----------------------------
 include/linux/preempt_mask.h            |  122 +++++++++++++++++++++++++++++
 include/linux/tick.h                    |   45 +++++++++--
 include/linux/vtime.h                   |   74 ++++++++++++++++--
 include/trace/events/context_tracking.h |   58 ++++++++++++++
 init/Kconfig                            |   28 +++++--
 kernel/context_tracking.c               |  128 ++++++++++++++++++-------------
 kernel/sched/core.c                     |    4 +-
 kernel/sched/cputime.c                  |   53 ++++---------
 kernel/time/Kconfig                     |    1 -
 kernel/time/tick-sched.c                |   56 ++++++--------
 19 files changed, 534 insertions(+), 326 deletions(-)

^ permalink raw reply	[flat|nested] 7+ messages in thread
end of thread, other threads:[~2013-08-14 17:31 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2013-08-05 19:01 [GIT PULL] timers/nohz updates for 3.12 Frederic Weisbecker
2013-08-12 18:44 ` Ingo Molnar
2013-08-12 21:28   ` Frederic Weisbecker
2013-08-13  0:03   ` Frederic Weisbecker
2013-08-13 14:57     ` Ingo Molnar
2013-08-14 15:56       ` Frederic Weisbecker
2013-08-14 17:31         ` Ingo Molnar

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