Messages in this thread | | | Subject | Re: [RFC][PATCH] perf, intel: Don't touch MSR_IA32_DEBUGCTLMSR from NMI context | From | Peter Zijlstra <> | Date | Wed, 12 Sep 2012 19:45:11 +0200 |
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On Wed, 2012-09-12 at 19:37 +0200, Peter Zijlstra wrote: > Ah, so I do think EIO will re-enable LBR,
OK, it does not, but the:
> also the handler is wrapped in > x86_pmu::{dis,en}able_all() which does end up calling > intel_pmu_lbr_{dis,en}able_all().
Thing does the re-enable for us,
> However that leaves the MSR in the > exact same state on exit as it was on enter, so that's not a problem for > the: read-modify-write change.
in a safe way.
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