perf/core: Add perf_pmu_resched() as global function (c68d224e) · Commits · 戴 / test

This patch add perf_pmu_resched() a global function that can be called to force rescheduling of events for a given PMU. The function locks both cpuctx and task_ctx internally. This will be used by a subsequent patch. Signed-off-by:

Stephane Eranian <eranian@google.com> [ Simplified the calling convention. ] Signed-off-by:

Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: kan.liang@intel.com Cc: nelson.dsouza@intel.com Cc: tonyj@suse.com Link: https://lkml.kernel.org/r/20190408173252.37932-2-eranian@google.com Signed-off-by:

Ingo Molnar <mingo@kernel.org>

include/linux/perf_event.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -888,6 +888,9 @@ extern void perf_sched_cb_dec(struct pmu *pmu);
		extern void perf_sched_cb_inc(struct pmu *pmu);
		extern int perf_event_task_disable(void);
		extern int perf_event_task_enable(void);

		extern void perf_pmu_resched(struct pmu *pmu);

		extern int perf_event_refresh(struct perf_event *event, int refresh);
		extern void perf_event_update_userpage(struct perf_event *event);
		extern int perf_event_release_kernel(struct perf_event *event);

kernel/events/core.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -2478,6 +2478,16 @@ static void ctx_resched(struct perf_cpu_context *cpuctx,
		perf_pmu_enable(cpuctx->ctx.pmu);
		}

		void perf_pmu_resched(struct pmu *pmu)
		{
		struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
		struct perf_event_context *task_ctx = cpuctx->task_ctx;

		perf_ctx_lock(cpuctx, task_ctx);
		ctx_resched(cpuctx, task_ctx, EVENT_ALL\|EVENT_CPU);
		perf_ctx_unlock(cpuctx, task_ctx);
		}

		/*
		* Cross CPU call to install and enable a performance event
		*

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