commit 6c7e550f13f8ad82efb6a5653ae628c2543c1768
author Franck Bui-Huu <fbuihuu@gmail.com> Tue Nov 23 16:21:43 2010 +0100
committer Ingo Molnar <mingo@elte.hu> Fri Nov 26 15:14:54 2010 +0100
tree 1c994b999648fbe51ffe4312e2d6827aedd5f012
parent 35d3778a8fe3c8b4a7513565e34d3bde00ce43ec

perf: Introduce is_sampling_event()

and use it when appropriate.

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1290525705-6265-1-git-send-email-fbuihuu@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/perf_event.c

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 43f757c..8806984 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -2514,7 +2514,7 @@
 	int ret = 0;
 	u64 value;
 
-	if (!event->attr.sample_period)
+	if (!is_sampling_event(event))
 		return -EINVAL;
 
 	if (copy_from_user(&value, arg, sizeof(value)))
@@ -4385,7 +4385,7 @@
 	if (!regs)
 		return;
 
-	if (!hwc->sample_period)
+	if (!is_sampling_event(event))
 		return;
 
 	if (nr == 1 && hwc->sample_period == 1 && !event->attr.freq)
@@ -4548,7 +4548,7 @@
 	struct hw_perf_event *hwc = &event->hw;
 	struct hlist_head *head;
 
-	if (hwc->sample_period) {
+	if (is_sampling_event(event)) {
 		hwc->last_period = hwc->sample_period;
 		perf_swevent_set_period(event);
 	}
@@ -4920,7 +4920,7 @@
 
 	hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 	hwc->hrtimer.function = perf_swevent_hrtimer;
-	if (hwc->sample_period) {
+	if (is_sampling_event(event)) {
 		s64 period = local64_read(&hwc->period_left);
 
 		if (period) {
@@ -4941,7 +4941,7 @@
 {
 	struct hw_perf_event *hwc = &event->hw;
 
-	if (hwc->sample_period) {
+	if (is_sampling_event(event)) {
 		ktime_t remaining = hrtimer_get_remaining(&hwc->hrtimer);
 		local64_set(&hwc->period_left, ktime_to_ns(remaining));