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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