From: Robert Richter <robert.richter@amd.com>
Date: Wed, 29 Apr 2009 10:47:01 +0000 (+0200)
Subject: perf_counter, x86: rework pmc_amd_save_disable_all() and pmc_amd_restore_all()
X-Git-Tag: v2.6.31-rc1~383^2~351
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4295ee62660b13ddb87d41539f49b239e6e7d56f;p=pandora-kernel.git

perf_counter, x86: rework pmc_amd_save_disable_all() and pmc_amd_restore_all()

MSR reads and writes are expensive. This patch adds checks to avoid
its usage where possible.

[ Impact: micro-optimization on AMD CPUs ]

Signed-off-by: Robert Richter <robert.richter@amd.com>
Cc: Paul Mackerras <paulus@samba.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1241002046-8832-5-git-send-email-robert.richter@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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