From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 20 Nov 2009 21:19:50 +0000 (+0100)
Subject: perf: Optimize perf_event_task_sched_out
X-Git-Tag: v2.6.33-rc1~399^2~132
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=02ffdbc866c8b1c8644601e9aa6155700eed4c91;p=pandora-kernel.git

perf: Optimize perf_event_task_sched_out

Remove an update_context_time() call from the
perf_event_task_sched_out() path and into the branch its needed.

The call was both superfluous, because __perf_event_sched_out()
already does it, and wrong, because it was done without holding
ctx->lock.

Place it in perf_event_sync_stat(), which is the only place it
is needed and which does already hold ctx->lock.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20091120212508.779516394@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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