From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Tue, 18 May 2010 09:12:48 +0000 (+0200)
Subject: perf: Optimize perf_output_*() by avoiding local_xchg()
X-Git-Tag: v2.6.35-rc1~30^2~34
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6d1acfd5c6bfd5231c13a8f2858d7f2afbaa1b62;p=pandora-kernel.git

perf: Optimize perf_output_*() by avoiding local_xchg()

Since the x86 XCHG ins implies LOCK, avoid the use by
using a sequence count instead.

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

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