linux-kernel - [RFC PATCH 5/6] hrtimer: record more real start_site for timer

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Message-Id: <1283094309-6635-6-git-send-email-yong.zhang0@gmail.com>
Date:	Sun, 29 Aug 2010 23:05:08 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	tglx@...utronix.de, akpm@...ux-foundation.org, mingo@...e.hu,
	arjan@...ux.intel.com, a.p.zijlstra@...llo.nl, tj@...nel.org,
	oleg@...hat.com
Subject: [RFC PATCH 5/6] hrtimer: record more real start_site for timer_stats

From: Yong Zhang <yong.zhang@...driver.com>

Most call sites are showed as hrtimer_start_range_ns(). This gives us
not enough info about the start_site. Then call
timer_stats_hrtimer_set_start_info() in hrtimer_start*() to
record the upper caller.

Signed-off-by: Yong Zhang <yong.zhang0@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 kernel/hrtimer.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 2b79ab4..1820a83 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1014,6 +1014,7 @@ int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
 int hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
 		unsigned long delta_ns, const enum hrtimer_mode mode)
 {
+	timer_stats_hrtimer_set_start_info(timer);
 	return __hrtimer_start_range_ns(timer, tim, delta_ns, mode, 1);
 }
 EXPORT_SYMBOL_GPL(hrtimer_start_range_ns);
@@ -1031,6 +1032,7 @@ EXPORT_SYMBOL_GPL(hrtimer_start_range_ns);
 int
 hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
 {
+	timer_stats_hrtimer_set_start_info(timer);
 	return __hrtimer_start_range_ns(timer, tim, 0, mode, 1);
 }
 EXPORT_SYMBOL_GPL(hrtimer_start);
-- 
1.7.0.4

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