Commit-ID: 6c7e550f13f8ad82efb6a5653ae628c2543c1768
Gitweb: http://git.kernel.org/tip/6c7e550f13f8ad82efb6a5653ae628c2543c1768
Author: Franck Bui-Huu <fbuihuu@xxxxxxxxx>
AuthorDate: Tue, 23 Nov 2010 16:21:43 +0100
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Fri, 26 Nov 2010 15:14:54 +0100
perf: Introduce is_sampling_event()
and use it when appropriate.
Signed-off-by: Franck Bui-Huu <fbuihuu@xxxxxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
LKML-Reference: <1290525705-6265-1-git-send-email-fbuihuu@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
arch/x86/kernel/cpu/perf_event.c | 2 +-
include/linux/perf_event.h | 5 +++++
kernel/perf_event.c | 10 +++++-----
3 files changed, 11 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 7c1a4c3..c01dfec 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -442,7 +442,7 @@ static int x86_setup_perfctr(struct perf_event *event)
struct hw_perf_event *hwc = &event->hw;
u64 config;
- if (!hwc->sample_period) {
+ if (!is_sampling_event(event)) {
hwc->sample_period = x86_pmu.max_period;
hwc->last_period = hwc->sample_period;
local64_set(&hwc->period_left, hwc->sample_period);
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index de2c417..cbf04cc 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -969,6 +969,11 @@ extern int perf_event_overflow(struct perf_event *event, int nmi,
struct perf_sample_data *data,
struct pt_regs *regs);
+static inline bool is_sampling_event(struct perf_event *event)
+{
+ return event->attr.sample_period != 0;
+}
+
/*
* Return 1 for a software event, 0 for a hardware event
*/
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 @@ static int perf_event_period(struct perf_event *event, u64 __user *arg)
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 @@ static void perf_swevent_event(struct perf_event *event, u64 nr,
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 @@ static int perf_swevent_add(struct perf_event *event, int flags)
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 @@ static void perf_swevent_start_hrtimer(struct perf_event *event)
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 @@ static void perf_swevent_cancel_hrtimer(struct perf_event *event)
{
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));
--
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