x86, perfcounters: read out MSR_CORE_PERF_GLOBAL_STATUS with counters disabled

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Impact: make perfcounter NMI and IRQ sequence more robust

Make __smp_perf_counter_interrupt() a bit more conservative: first disable
all counters, then read out the status. Most invocations are because there
are real events, so there's no performance impact.

Code flow gets a bit simpler as well this way.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

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This commit is contained in:

Ingo Molnar 2008-12-08 14:20:16 +01:00

parent 241771ef01

commit 87b9cf4623

1 changed files with 5 additions and 7 deletions

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arch/x86/kernel/cpu/perf_counter.c

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