Commit 3e830f65 authored by Kan Liang's avatar Kan Liang Committed by Peter Zijlstra
Browse files

perf/x86: Optimize the is_x86_event 



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: default avatarKan Liang <kan.liang@linux.intel.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20250424134718.311934-5-kan.liang@linux.intel.com
parent efd44854

arch/x86/events/core.c

+10 −9
Original line number Diff line number Diff line
@@ -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)

	/*

	 * 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;

}