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Commit 9717e6cd authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
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perf_events: Optimize perf_event_task_tick() 



Pretty much all of the calls do perf_disable/perf_enable cycles, pull
that out to cut back on hardware programming.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f24bb999

kernel/perf_event.c

+4 −4
Original line number Original line Diff line number Diff line
@@ -1573,12 +1573,8 @@ static void rotate_ctx(struct perf_event_context *ctx) 
	raw_spin_lock(&ctx->lock);

	raw_spin_lock(&ctx->lock);





	/* Rotate the first entry last of non-pinned groups */

	/* Rotate the first entry last of non-pinned groups */

	perf_disable();



	list_rotate_left(&ctx->flexible_groups);

	list_rotate_left(&ctx->flexible_groups);





	perf_enable();



	raw_spin_unlock(&ctx->lock);

	raw_spin_unlock(&ctx->lock);

}

}
@@ -1593,6 +1589,8 @@ void perf_event_task_tick(struct task_struct *curr) 
	cpuctx = &__get_cpu_var(perf_cpu_context);

	cpuctx = &__get_cpu_var(perf_cpu_context);

	ctx = curr->perf_event_ctxp;

	ctx = curr->perf_event_ctxp;





	perf_disable();



	perf_ctx_adjust_freq(&cpuctx->ctx);

	perf_ctx_adjust_freq(&cpuctx->ctx);

	if (ctx)

	if (ctx)

		perf_ctx_adjust_freq(ctx);

		perf_ctx_adjust_freq(ctx);
@@ -1608,6 +1606,8 @@ void perf_event_task_tick(struct task_struct *curr) 
	cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE);

	cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE);

	if (ctx)

	if (ctx)

		task_ctx_sched_in(curr, EVENT_FLEXIBLE);

		task_ctx_sched_in(curr, EVENT_FLEXIBLE);



	perf_enable();

}

}





static int event_enable_on_exec(struct perf_event *event,

static int event_enable_on_exec(struct perf_event *event,