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perf: Don't bother to init the hrtimer for no SW sampling counters

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Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1290525705-6265-3-git-send-email-fbuihuu@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Franck Bui-Huu 2010-11-23 16:21:45 +01:00 • committed by Ingo Molnar
commit 5d508e820a
1 changed files with 13 additions and 11 deletions
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24
kernel/perf_event.c
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@ -4917,24 +4917,26 @@ static enum hrtimer_restart perf_swevent_hrtimer(struct hrtimer *hrtimer)
static void perf_swevent_start_hrtimer(struct perf_event *event) static void perf_swevent_start_hrtimer(struct perf_event *event)
{ {
struct hw_perf_event *hwc = &event->hw; struct hw_perf_event *hwc = &event->hw;
s64 period;
if (!is_sampling_event(event))
return;
hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hwc->hrtimer.function = perf_swevent_hrtimer; hwc->hrtimer.function = perf_swevent_hrtimer;
if (is_sampling_event(event)) {
s64 period = local64_read(&hwc->period_left);
if (period) { period = local64_read(&hwc->period_left);
if (period < 0) if (period) {
period = 10000; if (period < 0)
period = 10000;
local64_set(&hwc->period_left, 0); local64_set(&hwc->period_left, 0);
} else { } else {
period = max_t(u64, 10000, hwc->sample_period); period = max_t(u64, 10000, hwc->sample_period);
} }
__hrtimer_start_range_ns(&hwc->hrtimer, __hrtimer_start_range_ns(&hwc->hrtimer,
ns_to_ktime(period), 0, ns_to_ktime(period), 0,
HRTIMER_MODE_REL_PINNED, 0); HRTIMER_MODE_REL_PINNED, 0);
}
} }
static void perf_swevent_cancel_hrtimer(struct perf_event *event) static void perf_swevent_cancel_hrtimer(struct perf_event *event)