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perf counters: protect them against CSTATE transitions
authorThomas Gleixner <tglx@linutronix.de>
Tue, 9 Dec 2008 20:43:39 +0000 (21:43 +0100)
committerIngo Molnar <mingo@elte.hu>
Thu, 11 Dec 2008 14:45:45 +0000 (15:45 +0100)
Impact: fix rare lost events problem

There are CPUs whose performance counters misbehave on CSTATE transitions,
so provide a way to just disable/enable them around deep idle methods.

(hw_perf_enable_all() is cheap on x86.)

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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