[RFC][PATCH 1/5] perf: Check if we should exclude idle thread in perf_exclude_event()

[Matt Fleming]

Don't open code the event check for excluding the idle thread. Instead
include the check in perf_exclude_event().

Signed-off-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxx>
---
 kernel/perf_event.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 0d38f27..16b0476 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4310,6 +4310,9 @@ static int perf_exclude_event(struct perf_event *event,
 
 		if (event->attr.exclude_kernel && !user_mode(regs))
 			return 1;
+
+		if (event->attr.exclude_idle && current->pid == 0)
+			return 1;
 	}
 
 	return 0;
@@ -4512,9 +4515,8 @@ static enum hrtimer_restart perf_swevent_hrtimer(struct hrtimer *hrtimer)
 	regs = get_irq_regs();
 
 	if (regs && !perf_exclude_event(event, regs)) {
-		if (!(event->attr.exclude_idle && current->pid == 0))
-			if (perf_event_overflow(event, 0, &data, regs))
-				ret = HRTIMER_NORESTART;
+		if (perf_event_overflow(event, 0, &data, regs))
+			ret = HRTIMER_NORESTART;
 	}
 
 	period = max_t(u64, 10000, event->hw.sample_period);
-- 
1.7.1

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