diff options
Diffstat (limited to 'kernel/perf_event.c')
| -rw-r--r-- | kernel/perf_event.c | 31 |
1 files changed, 19 insertions, 12 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index 9a98ce953561..5ed0c06765bb 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -71,23 +71,20 @@ static atomic64_t perf_event_id; */ static DEFINE_SPINLOCK(perf_resource_lock); -void __weak hw_perf_disable(void) { barrier(); } -void __weak hw_perf_enable(void) { barrier(); } - void __weak perf_event_print_debug(void) { } -static DEFINE_PER_CPU(int, perf_disable_count); - -void perf_disable(void) +void perf_pmu_disable(struct pmu *pmu) { - if (!__get_cpu_var(perf_disable_count)++) - hw_perf_disable(); + int *count = this_cpu_ptr(pmu->pmu_disable_count); + if (!(*count)++) + pmu->pmu_disable(pmu); } -void perf_enable(void) +void perf_pmu_enable(struct pmu *pmu) { - if (!--__get_cpu_var(perf_disable_count)) - hw_perf_enable(); + int *count = this_cpu_ptr(pmu->pmu_disable_count); + if (!--(*count)) + pmu->pmu_enable(pmu); } static void get_ctx(struct perf_event_context *ctx) @@ -4970,11 +4967,19 @@ static struct srcu_struct pmus_srcu; int perf_pmu_register(struct pmu *pmu) { + int ret; + mutex_lock(&pmus_lock); + ret = -ENOMEM; + pmu->pmu_disable_count = alloc_percpu(int); + if (!pmu->pmu_disable_count) + goto unlock; list_add_rcu(&pmu->entry, &pmus); + ret = 0; +unlock: mutex_unlock(&pmus_lock); - return 0; + return ret; } void perf_pmu_unregister(struct pmu *pmu) @@ -4984,6 +4989,8 @@ void perf_pmu_unregister(struct pmu *pmu) mutex_unlock(&pmus_lock); synchronize_srcu(&pmus_srcu); + + free_percpu(pmu->pmu_disable_count); } struct pmu *perf_init_event(struct perf_event *event) |