From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH] perf_event: initialize data.period in perf_swevent_hrtimer()
Date: Tue, 01 Dec 2009 17:30:08 +0800 [thread overview]
Message-ID: <4B14E220.2050107@cn.fujitsu.com> (raw)
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>
---
kernel/perf_event.c | 1 +
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
--
1.6.1.2
next reply other threads:[~2009-12-01 9:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-01 9:30 Xiao Guangrong [this message]
2009-12-01 9:37 ` [PATCH] perf_event: initialize data.period in perf_swevent_hrtimer() Peter Zijlstra
2009-12-01 10:21 ` [tip:perf/core] perf_event: Initialize " tip-bot for Xiao Guangrong
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