diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/core.c | 9 | ||||
| -rw-r--r-- | kernel/irq_work.c | 6 |
2 files changed, 11 insertions, 4 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 2067cbb..45e5543 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -243,7 +243,7 @@ static void perf_duration_warn(struct irq_work *w) printk_ratelimited(KERN_WARNING "perf interrupt took too long (%lld > %lld), lowering " "kernel.perf_event_max_sample_rate to %d\n", - avg_local_sample_len, allowed_ns, + avg_local_sample_len, allowed_ns >> 1, sysctl_perf_event_sample_rate); } @@ -283,7 +283,12 @@ void perf_sample_event_took(u64 sample_len_ns) update_perf_cpu_limits(); - irq_work_queue(&perf_duration_work); + if (!irq_work_queue(&perf_duration_work)) { + early_printk("perf interrupt took too long (%lld > %lld), lowering " + "kernel.perf_event_max_sample_rate to %d\n", + avg_local_sample_len, allowed_ns >> 1, + sysctl_perf_event_sample_rate); + } } static atomic64_t perf_event_id; diff --git a/kernel/irq_work.c b/kernel/irq_work.c index 55fcce6..a82170e 100644 --- a/kernel/irq_work.c +++ b/kernel/irq_work.c @@ -61,11 +61,11 @@ void __weak arch_irq_work_raise(void) * * Can be re-enqueued while the callback is still in progress. */ -void irq_work_queue(struct irq_work *work) +bool irq_work_queue(struct irq_work *work) { /* Only queue if not already pending */ if (!irq_work_claim(work)) - return; + return false; /* Queue the entry and raise the IPI if needed. */ preempt_disable(); @@ -83,6 +83,8 @@ void irq_work_queue(struct irq_work *work) } preempt_enable(); + + return true; } EXPORT_SYMBOL_GPL(irq_work_queue); |
