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Commit f6f83785 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

perf: Optimize __perf_event_read() 



Both callers actually have IRQs disabled, no need doing so
again.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20091120212508.863685796@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 02ffdbc8

kernel/perf_event.c

+0 −3
Original line number Diff line number Diff line
@@ -1517,7 +1517,6 @@ static void __perf_event_read(void *info) 
	struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);

	struct perf_event *event = info;

	struct perf_event_context *ctx = event->ctx;

	unsigned long flags;



	/*

	 * If this is a task context, we need to check whether it is
@@ -1529,12 +1528,10 @@ static void __perf_event_read(void *info) 
	if (ctx->task && cpuctx->task_ctx != ctx)

		return;



	local_irq_save(flags);

	if (ctx->is_active)

		update_context_time(ctx);

	event->pmu->read(event);

	update_event_times(event);

	local_irq_restore(flags);

}



static u64 perf_event_read(struct perf_event *event)