linux-kernel - Re: [GIT PULL v2] dynticks updates for 3.14

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Date:	Wed, 4 Dec 2013 10:11:43 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Olivier Langlois <olivier@...vierlanglois.net>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: Re: [GIT PULL v2] dynticks updates for 3.14


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> Ingo,
> 
> Please pull the timers/core-v2 branch that can be found at:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
> 	timers/core-v2
> 
> It's a rebase of the previous pull request against 3.13-rc2 which addresses
> your reviews:
> 
> * Fix build error with tick_check_nohz() off case
> 
> * Refine changelog of "posix-timers: Fix full dynticks CPUs kick on timer rescheduling"
>   to make it clearer that it's a bug fix and not just an optimization.
>   Also add more overall details in the changelog about the description of the issue.
> 
> * Rename tick_check_nohz() and tick_check_oneshot_broadcast() to extend with *_this_cpu()
>   suffix. Note that I left functions that use *_idle_* based naming as is because idle
>   itself is a per cpu notion already. Now I can still extend these functions as well
>   in a delta if you want, although IMHO I fear that would uglify the code more than helping.
> 
> ---
> Here is a summary of the overall changes against tip:timers/core :
> 
> * Optimizations and cleanups on the use of per CPU APIs to improve code readability,
> performance and debuggability in the nohz subsystem;
> 
> * Rename some functions to extend with *_this_cpu() suffix for clarity
> 
> * Refine the naming of some context tracking subsystem state accessors
> 
> * Optimize posix cpu timer by sparing stub workqueue queue with full dynticks off case
> 
> * Trivial spelling fix by Paul Gortmaker
> 
> * Fix a bug where posix cpu timers requeued due to interval got ignored on full
>   dynticks CPUs (not a regression though as it only impacts full dynticks and the
>   bug is there since we merged full dynticks).
> 
> 
> Let me know if you find any issue.
> 
> Thanks,
> 	Frederic
> ---
> 
> Frederic Weisbecker (5):
>       nohz: Convert a few places to use local per cpu accesses
>       context_tracking: Wrap static key check into more intuitive function name
>       context_tracking: Rename context_tracking_active() to context_tracking_cpu_is_enabled()
>       posix-timers: Spare workqueue if there is no full dynticks CPU to kick
>       posix-timers: Fix full dynticks CPUs kick on timer rescheduling
> 
> Paul Gortmaker (1):
>       trivial: fix spelling in CONTEXT_TRACKING_FORCE help text
> 
> 
>  include/linux/context_tracking.h       | 10 ++++-----
>  include/linux/context_tracking_state.h | 11 +++++++---
>  include/linux/tick.h                   |  8 +++----
>  include/linux/vtime.h                  |  4 ++--
>  init/Kconfig                           |  2 +-
>  kernel/context_tracking.c              |  8 +++----
>  kernel/posix-cpu-timers.c              | 21 ++++++++----------
>  kernel/softirq.c                       |  4 +---
>  kernel/time/tick-broadcast.c           |  6 +++---
>  kernel/time/tick-internal.h            |  4 ++--
>  kernel/time/tick-sched.c               | 39 ++++++++++++++--------------------
>  11 files changed, 55 insertions(+), 62 deletions(-)

Pulled into tip:timers/core, thanks a lot Frederic!

	Ingo
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