From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 8 May 2009 16:52:21 +0000 (+0200)
Subject: perf_counter: optimize perf_counter_task_tick()
X-Git-Tag: v2.6.31-rc1~383^2~294
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7fc23a5380797012e92a9633169440f2f4a21253;p=pandora-kernel.git

perf_counter: optimize perf_counter_task_tick()

perf_counter_task_tick() does way too much work to find out
there's nothing to do. Provide an easy short-circuit for the
normal case where there are no counters on the system.

[ Impact: micro-optimization ]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090508170028.750619201@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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