From: Stanislaw Gruszka <sgruszka@redhat.com>
Date: Thu, 11 Mar 2010 22:04:31 +0000 (-0800)
Subject: posix-cpu-timers: Reset expire cache when no timer is running
X-Git-Tag: v2.6.34-rc3~22^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=15365c108ea27598e265f8c13e7051d99ca5b0b9;p=pandora-kernel.git

posix-cpu-timers: Reset expire cache when no timer is running

When a process deletes cpu timer or a timer expires we do not clear
the expiration cache sig->cputimer_expires.

As a result the fastpath_timer_check() which prevents us to loop over
all threads in case no timer is active is not working and we run the
slow path needlessly on every tick.

Zero sig->cputimer_expires in stop_process_timers().

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Spencer Candland <spencer@bluehost.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

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