From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Mon, 22 Jun 2009 11:58:35 +0000 (+0200)
Subject: perf_counter: Optimize perf_counter_alloc()'s inherit case
X-Git-Tag: v2.6.31-rc2~30^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f344011ccb85469445369153c3d27c4ee4bc2ac8;p=pandora-kernel.git

perf_counter: Optimize perf_counter_alloc()'s inherit case

We don't need to add usage counts for swcounter and attr usage
models for inherited counters since the parent counter will
always have one, which suffices to generate the needed output.

This avoids up to 3 global atomic increments per inherited
counter.

LKML-Reference: <new-submission>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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