On Mon, Oct 22, 2012 at 12:33 PM, Peter Zijlstra <a.p.zijls...@chello.nl> wrote: > > On Mon, 2012-10-22 at 14:11 +0800, Yan, Zheng wrote: > > + /* LBR callstack does not work well with FREEZE_LBRS_ON_PMI */ > > + if (!cpuc->lbr_sel || !(cpuc->lbr_sel->config & LBR_CALL_STACK)) > > + debugctl |= DEBUGCTLMSR_FREEZE_LBRS_ON_PMI; > Is this a bug or a feature?
> > How useful it is without this? How many calls between PMI and us getting > to intel_pmu_lbr_read()? Agreed with Peter. Freeze on PMI is critical for LBR in general. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
