linux-kernel - [GIT PULL v2] posix cpu timers cleanups for 3.14

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Date:	Mon,  9 Dec 2013 19:24:07 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Kosaki Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [GIT PULL v2] posix cpu timers cleanups for 3.14

Ingo, Thomas,

Please pull the timers/posix-timers-for-tip-v2 branch that can be found at:

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	timers/posix-timers-for-tip-v2

HEAD: 531f64fd6f46a3f2a3edb1b97ecc827c775932c5

This is the second version of the pull request that I sent you a few weeks ago:
http://lkml.kernel.org/r/1385221040-24731-1-git-send-email-fweisbec@gmail.com

Changes in this v2:

* rebase against latest tip:timers/core (there was a conflict with some dynticks
  patches)

* add a cleanup suggested by Kosaki in patch 02/10: remove a useless group
  timer sample snapshot and rearm on timer rescheduling.

Also the previous pull request lacked a high level overall description, so I'm
adding one here.

---

Posix cpu timers changes for 3.14:

* Remove dying thread/process timers caching that were complicating the code
  for no significant win.

* Remove early task reference release on dying timer sample read. Again it was
  not worth the code complication. The other timer's resources aren't released until
  timer_delete() is called anyway (or when the whole process dies).

* Remove leftover arguments in reaped target cleanup

* Consolidate some timer sampling code

* Remove use of tasklist lock

* Robustify sighand locking against exec and exit by using the safer
  lock_task_sighand() API instead of sighand raw locking.

* Convert some unnecessary BUG_ON() to WARN_ON()


Thanks,
	Frederic
---

Frederic Weisbecker (10):
      posix-timers: Remove dead thread posix cpu timers caching
      posix-timers: Remove dead process posix cpu timers caching
      posix-timers: Cleanup reaped target handling
      posix-timers: Remove dead task special case
      posix-timers: Remove useless clock sample on timers cleanup
      posix-timers: Consolidate posix_cpu_clock_get()
      posix-timers: Use sighand lock instead of tasklist_lock for task clock sample
      posix-timers: Use sighand lock instead of tasklist_lock on timer deletion
      posix-timers: Remove remaining uses of tasklist_lock
      posix-timers: Convert abuses of BUG_ON to WARN_ON


 kernel/posix-cpu-timers.c | 312 +++++++++++++++++++---------------------------
 1 file changed, 129 insertions(+), 183 deletions(-)
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