tree 8266c8216aa988aedb6a25925d99c9e269467e7e
parent 833df317f9ada91488898b005f4641bb674a3bae
author Dimitri Sivanich <sivanich@sgi.com> 1208551140 -0700
committer Thomas Gleixner <tglx@linutronix.de> 1208757591 +0200

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>