Messages in this thread | | | Date | Wed, 23 Jul 2014 08:59:03 +0800 | From | "Yan, Zheng" <> | Subject | Re: [PATCH v3 5/9] perf, x86: large PEBS interrupt threshold |
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On 07/23/2014 12:16 AM, Andi Kleen wrote: >> + /* >> + * When the event is constrained enough we can use a larger >> + * threshold and run the event with less frequent PMI. >> + */ >> + if (0 && /* disable this temporarily */ > > Where in the patchkit does it get reenabled?
enabled by patch 7 > > -Andi > >> + (hwc->flags & PERF_X86_EVENT_AUTO_RELOAD) && >> + !(event->attr.sample_type & ~PEBS_FREERUNNING_FLAGS)) { >> + threshold = ds->pebs_absolute_maximum - >> + x86_pmu.max_pebs_events * x86_pmu.pebs_record_size; >> + } else { >> + threshold = ds->pebs_buffer_base + x86_pmu.pebs_record_size; >> + } >> + if (first_pebs || ds->pebs_interrupt_threshold > threshold) >> + ds->pebs_interrupt_threshold = threshold;
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