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Date: Tue, 23 Nov 2010 16:21:45 +0100
From: Franck Bui-Huu <vagabon.xyz@...il.com>
To: a.p.zijlstra@...llo.nl
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] perf: don't bother to init the hrtimer for no SW sampling counters
From: Franck Bui-Huu <fbuihuu@...il.com>
Signed-off-by: Franck Bui-Huu <fbuihuu@...il.com>
---
kernel/perf_event.c | 24 +++++++++++++-----------
1 files changed, 13 insertions(+), 11 deletions(-)
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 813b09e..31515200 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4894,24 +4894,26 @@ static enum hrtimer_restart perf_swevent_hrtimer(struct hrtimer *hrtimer)
static void perf_swevent_start_hrtimer(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
+ s64 period;
+
+ if (!is_sampling_event(event))
+ return;
hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hwc->hrtimer.function = perf_swevent_hrtimer;
- if (is_sampling_event(event)) {
- s64 period = local64_read(&hwc->period_left);
- if (period) {
- if (period < 0)
- period = 10000;
+ period = local64_read(&hwc->period_left);
+ if (period) {
+ if (period < 0)
+ period = 10000;
- local64_set(&hwc->period_left, 0);
- } else {
- period = max_t(u64, 10000, hwc->sample_period);
- }
- __hrtimer_start_range_ns(&hwc->hrtimer,
+ local64_set(&hwc->period_left, 0);
+ } else {
+ period = max_t(u64, 10000, hwc->sample_period);
+ }
+ __hrtimer_start_range_ns(&hwc->hrtimer,
ns_to_ktime(period), 0,
HRTIMER_MODE_REL_PINNED, 0);
- }
}
static void perf_swevent_cancel_hrtimer(struct perf_event *event)
--
1.7.3.2
--
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