Messages in this thread | | | Date | Tue, 21 Jul 2020 16:31:10 +0200 | From | peterz@infradea ... | Subject | Re: [PATCH V6 09/14] perf/x86/intel: Support TopDown metrics on Ice Lake |
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On Tue, Jul 21, 2020 at 10:23:36AM -0400, Liang, Kan wrote:
> Patch 13 forces the slots event to be part of a metric group. In patch 7, > for a metric group, we only update the values once with slots event. > I think the normal case mentioned above should not happen. > > + /* Only need to call update_topdown_event() once for group read. */ > + if ((cpuc->txn_flags & PERF_PMU_TXN_READ) && > + !is_slots_event(event)) > + return; > + > + perf_pmu_disable(event->pmu); > + x86_pmu.update_topdown_event(event); > + perf_pmu_enable(event->pmu);
Ah, I missed that.
That also requires SLOTS to be the leader so that it will be the first read. Did we enforce that somewhere?
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