linux-kernel - [PATCH 0/8] tick/nohz: Tick dependency quick check + cleanups

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Message-Id: <1434044168-23173-1-git-send-email-fweisbec@gmail.com>
Date:	Thu, 11 Jun 2015 19:36:00 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Ingo Molnar <mingo@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Rik van Riel <riel@...hat.com>
Subject: [PATCH 0/8] tick/nohz: Tick dependency quick check + cleanups

Thomas suggested a few month ago to make the tick dependency check
more synchronous. Instead of checking asynchronously from each interrupt
if the tick can be stopped, every subsystem that may have a tick
dependency should set itself a flag specifying the state of that
dependency. This way we can verify if we can stop the tick with a single
lightweight mask check.

This patchset introduces that. There is still room for optimizations.

Also in a further series I would like to piggyback on the scheduler
interrupt to restart the tick in case of remote wakeups. The tick
restart from Irq exit prepares for that.

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	timers/core-v2

HEAD: e5470c6cd483edb77d6c8398b3f1479aa0eba215

Thanks,
	Frederic
---

Frederic Weisbecker (8):
      jiffies: Remove HZ > USEC_PER_SEC special case
      apm32: Fix cputime == jiffies assumption
      alpha: Fix jiffies based cputime assumption
      nohz: Remove idle task special case
      nohz: Restart the tick from irq exit
      nohz: Move tick_nohz_restart_sched_tick() above its users
      nohz: Evaluate tick dependency once on context switch
      nohz: Remove useless argument on tick_nohz_task_switch()


 arch/alpha/kernel/osf_sys.c |  13 +++--
 arch/x86/kernel/apm_32.c    |   2 +-
 include/linux/tick.h        |  16 ++----
 kernel/sched/core.c         |   2 +-
 kernel/time/tick-sched.c    | 127 ++++++++++++++++++++++----------------------
 kernel/time/tick-sched.h    |   6 +++
 kernel/time/time.c          |  14 ++---
 7 files changed, 93 insertions(+), 87 deletions(-)
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