From: Stephane Eranian Date: Mon, 8 Apr 2019 17:32:51 +0000 (-0700) Subject: perf/core: Add perf_pmu_resched() as global function X-Git-Tag: v5.2-rc1~205^2~15 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=c68d224e5ed15605e651e2482c6ffd95915ddf58;p=linux.git 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: Stephane Eranian [ Simplified the calling convention. ] Signed-off-by: Peter Zijlstra (Intel) Cc: Alexander Shishkin Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Vince Weaver 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 --- diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 085a95e2582a..f3864e1c5569 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -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); diff --git a/kernel/events/core.c b/kernel/events/core.c index 30a572e4c6f1..abbd4b3b96c2 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -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 *