From: Dimitri Sivanich <sivanich@sgi.com>
Date: Fri, 18 Apr 2008 20:39:00 +0000 (-0700)
Subject: hrtimer: reduce calls to hrtimer_get_softirq_time()
X-Git-Tag: v2.6.26-rc1~1129^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=833883d9ac4cfb31c1c4419335e68e6895a05b6b;p=pandora-kernel.git

hrtimer: reduce calls to hrtimer_get_softirq_time()

It seems that hrtimer_run_queues() is calling hrtimer_get_softirq_time() more
often than it needs to.  This can cause frequent contention on systems with
large numbers of processors/cores.

With this patch, hrtimer_run_queues only calls hrtimer_get_softirq_time() if
there is a pending timer in one of the hrtimer bases, and only once.

This also combines hrtimer_run_queues() and the inline run_hrtimer_queue()
into one function.

[ tglx@linutronix.de: coding style ]

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

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