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(parent: 241771e) | patch
x86, perfcounters: read out MSR_CORE_PERF_GLOBAL_STATUS with counters disabled
authorIngo Molnar <mingo@elte.hu>
Mon, 8 Dec 2008 13:20:16 +0000 (14:20 +0100)
committerIngo Molnar <mingo@elte.hu>
Mon, 8 Dec 2008 14:56:42 +0000 (15:56 +0100)
commit87b9cf4623ad4e5fc009e48c020593dffd5d3793
treebd49f47b3fee4f4dc956e7db303fb1c20d53eee3tree | snapshot
parent241771ef016b5c0c83cd7a4372a74321c973c1e6commit | diff
x86, perfcounters: read out MSR_CORE_PERF_GLOBAL_STATUS with counters disabled

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>
arch/x86/kernel/cpu/perf_counter.c diff | blob | blame | history
Linux kernel - Deliverables
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