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Merge "perf: Cancel the mux hrtimer during CPU hotplug to avoid migration"

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qctecmdr Service 2018-11-01 17:57:40 -07:00 committed by Gerrit - the friendly Code Review server
commit 51683be8d3
1 changed files with 11 additions and 0 deletions
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11
kernel/events/core.c
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@ -11532,6 +11532,7 @@ static void perf_event_exit_cpu_context(int cpu)
struct perf_cpu_context *cpuctx;
struct perf_event_context *ctx;
struct perf_event *event, *event_tmp;
unsigned long flags;
struct pmu *pmu;
mutex_lock(&pmus_lock);
@ -11539,6 +11540,16 @@ static void perf_event_exit_cpu_context(int cpu)
list_for_each_entry(pmu, &pmus, entry) {
cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);
ctx = &cpuctx->ctx;
/* Cancel the mux hrtimer to avoid CPU migration */
if (pmu->task_ctx_nr != perf_sw_context) {
raw_spin_lock_irqsave(&cpuctx->hrtimer_lock, flags);
hrtimer_cancel(&cpuctx->hrtimer);
cpuctx->hrtimer_active = 0;
raw_spin_unlock_irqrestore(&cpuctx->hrtimer_lock,
flags);
}
mutex_lock(&ctx->mutex);
list_for_each_entry_safe(event, event_tmp, &ctx->event_list,
event_entry) {