From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Mon, 8 Mar 2010 12:51:12 +0000 (+0100)
Subject: perf, x86: Don't reset the LBR as frequently
X-Git-Tag: v2.6.35-rc1~522^2~217
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b83a46e7da4a948cc852ba7805dfb1a392dec861;p=pandora-kernel.git

perf, x86: Don't reset the LBR as frequently

If we reset the LBR on each first counter, simple counter rotation which
first deschedules all counters and then reschedules the new ones will
lead to LBR reset, even though we're still in the same task context.

Reduce this by not flushing on the first counter but only flushing on
different task contexts.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: paulus@samba.org
Cc: eranian@google.com
Cc: robert.richter@amd.com
Cc: fweisbec@gmail.com
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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