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perf/x86: Optimize the is_x86_event

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The current is_x86_event has to go through the hybrid_pmus list to find
the matched pmu, then check if it's a X86 PMU and a X86 event. It's not
necessary.

The X86 PMU has a unique type ID on a non-hybrid machine, and a unique
capability type. They are good enough to do the check.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20250424134718.311934-5-kan.liang@linux.intel.com
This commit is contained in:
Kan Liang 2025-04-24 06:47:17 -07:00 committed by Peter Zijlstra
parent efd448540e
commit 3e830f657f
1 changed files with 10 additions and 9 deletions
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19
arch/x86/events/core.c
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@ -762,15 +762,16 @@ void x86_pmu_enable_all(int added)
int is_x86_event(struct perf_event *event)
{
int i;
if (!is_hybrid())
return event->pmu == &pmu;
for (i = 0; i < x86_pmu.num_hybrid_pmus; i++) {
if (event->pmu == &x86_pmu.hybrid_pmu[i].pmu)
return true;
}
/*
* For a non-hybrid platforms, the type of X86 pmu is
* always PERF_TYPE_RAW.
* For a hybrid platform, the PERF_PMU_CAP_EXTENDED_HW_TYPE
* is a unique capability for the X86 PMU.
* Use them to detect a X86 event.
*/
if (event->pmu->type == PERF_TYPE_RAW ||
event->pmu->capabilities & PERF_PMU_CAP_EXTENDED_HW_TYPE)
return true;
return false;
}