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Commit c68d224e authored by Stephane Eranian's avatar Stephane Eranian Committed by Ingo Molnar
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perf/core: Add perf_pmu_resched() as global function 



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: default avatarStephane Eranian <eranian@google.com>
[ Simplified the calling convention. ]
Signed-off-by: default avatarPeter 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: default avatarIngo Molnar <mingo@kernel.org>
parent cc867094

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

 *