From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Tue, 15 Feb 2011 21:26:07 +0000 (+0100)
Subject: perf: Fix throttle logic
X-Git-Tag: v2.6.37.2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e922e3380b4b02babff5feade9b1428945429a69;p=pandora-kernel.git

perf: Fix throttle logic

commit 4fe757dd48a9e95e1a071291f15dda5421dacb66 upstream.

It was possible to call pmu::start() on an already running event. In
particular this lead so some wreckage as the hrtimer events would
re-initialize active timers.

This was due to throttled events being activated again by scheduling.
Scheduling in a context would add and force start events, resulting in
running events with a possible throttle status. The next tick to hit
that task will then try to unthrottle the event and call ->start() on
an already running event.

Reported-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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