linux-kernel - [PATCH v4 0/6] Deferrable timers support for hrtimers/timerfd API

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Message-id: <1392913425-29369-1-git-send-email-a.perevalov@samsung.com>
Date:	Thu, 20 Feb 2014 20:23:39 +0400
From:	Alexey Perevalov <a.perevalov@...sung.com>
To:	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	john.stultz@...aro.org
Cc:	Alexey Perevalov <a.perevalov@...sung.com>, anton@...msg.org,
	kyungmin.park@...sung.com, cw00.choi@...sung.com,
	akpm@...ux-foundation.org
Subject: [PATCH v4 0/6] Deferrable timers support for hrtimers/timerfd API

Hello,

This patch set introduces deferrable functionality for hrtimers and add ability
to use it from timerfd_create syscall.
It means user-space processes are able to not wake up the system from cpuidle state
in case of periodic job. And it's the main goal of this patch set for us and for team
sent such patch set before.
I hope it will find users in kernel space too, cause it could avoid timer_list drawbacks,
such as worst case when many,many timers are gonna to be expired.


Kernel already has deferrable timer funcionality based on timer_list. But deferrable
functionality inside hrtimers makes timerfd implemenation trivial for such case.

It's based on github.com/torvalds/linux.git git repository on top of
e95003c3f9ccbfa7ab9d265e6eb703ee2fa4cfe7

Alexey Perevalov (3):
  Replace ternary operator to macro
  tracing/trivial: Add CLOCK_BOOTIME and CLOCK_TAI for human readable
    clockid trace
  tracing/trivial: Add CLOCK_*_DEFERRABLE for tracing clockids

Anton Vorontsov (2):
  timerfd: Move repeated logic into timerfd_rearm()
  timerfd: Add support for deferrable timers

Thomas Gleixner (1):
  hrtimer: Add support for deferrable timer into the hrtimer

 fs/timerfd.c                 |   47 ++++++++++++++++----------------
 include/linux/hrtimer.h      |    3 ++
 include/trace/events/timer.h |   25 ++++++++++++++---
 include/uapi/linux/time.h    |    3 ++
 kernel/hrtimer.c             |   62 +++++++++++++++++++++++++++++++++---------
 5 files changed, 100 insertions(+), 40 deletions(-)

-- 
1.7.9.5

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