From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 19 Jun 2009 16:27:26 +0000 (+0200)
Subject: perf_counter: Optimize perf_swcounter_event()
X-Git-Tag: v2.6.31-rc2~30^2~38
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f29ac756a40d0f1bb07d682ea521e7b666ff06d5;p=pandora-kernel.git

perf_counter: Optimize perf_swcounter_event()

Similar to tracepoints, use an enable variable to reduce
overhead when unused.

Only look for a counter of a particular event type when we know
there is at least one in the system.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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