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perf_events: Optimize perf_event_task_tick()

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

Signed-off-by: Peter 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: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2010-01-28 13:57:44 +01:00 committed by Ingo Molnar
parent f24bb999d2
commit 9717e6cd3d
1 changed files with 4 additions and 4 deletions
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8
kernel/perf_event.c
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@ -1573,12 +1573,8 @@ static void rotate_ctx(struct perf_event_context *ctx)
raw_spin_lock(&ctx->lock);
/* Rotate the first entry last of non-pinned groups */
perf_disable();
list_rotate_left(&ctx->flexible_groups);
perf_enable();
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);
ctx = curr->perf_event_ctxp;
perf_disable();
perf_ctx_adjust_freq(&cpuctx->ctx);
if (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);
if (ctx)
task_ctx_sched_in(curr, EVENT_FLEXIBLE);
perf_enable();
}
static int event_enable_on_exec(struct perf_event *event,