linux-kernel - [PATCH 10.5/11] perf_counter: fix hrtimer sampling

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Date:	Fri, 13 Mar 2009 16:43:47 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	mingo@...e.hu
Cc:	paulus@...ba.org, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: [PATCH 10.5/11] perf_counter: fix hrtimer sampling


Fix for the perfstat fubar..

We cannot unconditionally call hrtimer_cancel() without ever having done
hrtimer_init() on the thing.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
Index: linux-2.6/kernel/perf_counter.c
===================================================================
--- linux-2.6.orig/kernel/perf_counter.c
+++ linux-2.6/kernel/perf_counter.c
@@ -1565,9 +1565,9 @@ static int cpu_clock_perf_counter_enable
 	int cpu = raw_smp_processor_id();
 
 	atomic64_set(&hwc->prev_count, cpu_clock(cpu));
+	hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	hwc->hrtimer.function = perf_swcounter_hrtimer;
 	if (hwc->irq_period) {
-		hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
-		hwc->hrtimer.function = perf_swcounter_hrtimer;
 		__hrtimer_start_range_ns(&hwc->hrtimer,
 				ns_to_ktime(hwc->irq_period), 0,
 				HRTIMER_MODE_REL, 0);
@@ -1629,9 +1629,9 @@ static int task_clock_perf_counter_enabl
 	struct hw_perf_counter *hwc = &counter->hw;
 
 	atomic64_set(&hwc->prev_count, task_clock_perf_counter_val(counter, 0));
+	hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	hwc->hrtimer.function = perf_swcounter_hrtimer;
 	if (hwc->irq_period) {
-		hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
-		hwc->hrtimer.function = perf_swcounter_hrtimer;
 		__hrtimer_start_range_ns(&hwc->hrtimer,
 				ns_to_ktime(hwc->irq_period), 0,
 				HRTIMER_MODE_REL, 0);


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