From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 13 May 2009 10:54:01 +0000 (+0200)
Subject: perf_counter: x86: Fix throttling
X-Git-Tag: v2.6.31-rc1~383^2~280
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f5a5a2f6e69e88647ae12da39f0ff3a510bcf0a6;p=pandora-kernel.git

perf_counter: x86: Fix throttling

If counters are disabled globally when a perfcounter IRQ/NMI hits,
and if we throttle in that case, we'll promote the '0' value to
the next lapic IRQ and disable all perfcounters at that point,
permanently ...

Fix it.

[ Impact: fix hung perfcounters under load ]

Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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