tree accb533350a655e39a8ab846abc37018b2f87ccf
parent 43874d238d5f208854a73c3225ca2a22833eec8b
author Thomas Gleixner <tglx@linutronix.de> 1228855419 +0100
committer Ingo Molnar <mingo@elte.hu> 1229006745 +0100

perf counters: protect them against CSTATE transitions

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>