diff options
| -rw-r--r-- | kernel/events/core.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 3fe385aa93e6..916cf1f593b4 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -870,12 +870,8 @@ static void perf_pmu_rotate_start(struct pmu *pmu) WARN_ON(!irqs_disabled()); - if (list_empty(&cpuctx->rotation_list)) { - int was_empty = list_empty(head); + if (list_empty(&cpuctx->rotation_list)) list_add(&cpuctx->rotation_list, head); - if (was_empty) - tick_nohz_full_kick(); - } } static void get_ctx(struct perf_event_context *ctx) @@ -1875,6 +1871,9 @@ static int __perf_install_in_context(void *info) perf_pmu_enable(cpuctx->ctx.pmu); perf_ctx_unlock(cpuctx, task_ctx); + if (atomic_read(&__get_cpu_var(perf_freq_events))) + tick_nohz_full_kick(); + return 0; } @@ -2812,10 +2811,11 @@ done: #ifdef CONFIG_NO_HZ_FULL bool perf_event_can_stop_tick(void) { - if (list_empty(&__get_cpu_var(rotation_list))) - return true; - else + if (atomic_read(&__get_cpu_var(perf_freq_events)) || + __this_cpu_read(perf_throttled_count)) return false; + else + return true; } #endif @@ -5202,6 +5202,7 @@ static int __perf_event_overflow(struct perf_event *event, __this_cpu_inc(perf_throttled_count); hwc->interrupts = MAX_INTERRUPTS; perf_log_throttle(event, 0); + tick_nohz_full_kick(); ret = 1; } } |