From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Tue, 18 May 2010 08:50:41 +0000 (+0200)
Subject: perf: Optimize the perf_output() path by removing IRQ-disables
X-Git-Tag: v2.6.35-rc1~30^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ef60777c9abd999db5eb4e338aae3eb593ae8e10;p=pandora-kernel.git

perf: Optimize the perf_output() path by removing IRQ-disables

Since we can now assume there is only a single writer
to each buffer, we can remove per-cpu lock thingy and
use a simply nest-count to the same effect.

This removes the need to disable IRQs.

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

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