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authorXiao Guangrong <xiaoguangrong@cn.fujitsu.com>2009-12-01 17:30:08 +0800
committerIngo Molnar <mingo@elte.hu>2009-12-01 11:19:07 +0100
commit59d069eb5ae9b033ed1c124c92e1532c4a958991 (patch)
treec9668a2163edbb9055f8888e883920f6133d836b /kernel/perf_event.c
parentb498ce1f2753b9724b2fc05d2057f7d1490cfa93 (diff)
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perf_event: Initialize data.period in perf_swevent_hrtimer()
In current code in perf_swevent_hrtimer(), data.period is not initialized, The result is obvious wrong: # ./perf record -f -e cpu-clock make # ./perf report # Samples: 1740 # # Overhead Command ...... # ........ ........ .......................................... # 1025422183050275328.00% sh libc-2.9.90.so ... 1025422183050275328.00% perl libperl.so ... 1025422168240043264.00% perl [kernel] ... 1025422030011210752.00% perl [kernel] ... Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: <stable@kernel.org> LKML-Reference: <4B14E220.2050107@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/perf_event.c')
-rw-r--r--kernel/perf_event.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 0b9ca2d..040ee51 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4010,6 +4010,7 @@ static enum hrtimer_restart perf_swevent_hrtimer(struct hrtimer *hrtimer)
event->pmu->read(event);
data.addr = 0;
+ data.period = event->hw.last_period;
regs = get_irq_regs();
/*
* In case we exclude kernel IPs or are somehow not in interrupt