From: Thomas Gleixner <tglx@linutronix.de>
To: Anton Blanchard <anton@samba.org>
Cc: rostedt@goodmis.org, mingo@elte.hu, tzanussi@gmail.com,
jbaron@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] tracing/events: Add timer and high res timer tracepoints
Date: Wed, 20 May 2009 12:31:36 +0200 (CEST) [thread overview]
Message-ID: <alpine.LFD.2.00.0905201229280.5983@localhost.localdomain> (raw)
In-Reply-To: <20090520101334.GA23442@kryten>
On Wed, 20 May 2009, Anton Blanchard wrote:
>
> Add tracepoints for timer and high res timer execution. We add entry and
> exit tracepoints so we can calculate timer latency.
>
> Example ftrace output:
>
> <idle>-0 [000] 264.040506: hrtimer_entry: func=.tick_sched_timer+0x0/0xf0
> <idle>-0 [000] 264.040508: hrtimer_exit: func=.tick_sched_timer+0x0/0xf0 restart=HRTIMER_RESTART
> <idle>-0 [000] 264.040530: timer_entry: func=.e1000_watchdog+0x0/0x8fc
> <idle>-0 [000] 264.040728: timer_exit: func=.e1000_watchdog+0x0/0x8fc
>
> Here we can see e1000_watchdog is taking 0.2ms - it might make sense to
> move this into a workqueue or kernel thread.
Cute. That should help us to pinpoint more such timer abusers :)
> Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
next prev parent reply other threads:[~2009-05-20 10:32 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-20 10:13 [PATCH] tracing/events: Add timer and high res timer tracepoints Anton Blanchard
2009-05-20 10:25 ` KOSAKI Motohiro
2009-05-20 10:31 ` Thomas Gleixner [this message]
2009-05-21 0:01 ` Frédéric Weisbecker
2009-05-21 0:13 ` Steven Rostedt
2009-05-21 12:38 ` Anton Blanchard
2009-05-25 20:00 ` Frederic Weisbecker
2009-05-26 4:26 ` Anton Blanchard
2009-05-26 4:31 ` [PATCH] tracing/events: Rename worklet_execute to worklet_entry and worklet_complete to worklet_exit Anton Blanchard
2009-05-26 4:32 ` [PATCH] tracing/events: Use %pf in workqueue trace events Anton Blanchard
2009-05-26 4:36 ` tracing/events: Add tasklet tracepoints Anton Blanchard
2009-05-29 13:16 ` [PATCH] tracing/events: Rename worklet_execute to worklet_entry and worklet_complete to worklet_exit Frédéric Weisbecker
2009-05-26 4:55 ` [PATCH v3] tracing/events: Add timer and high res timer tracepoints Anton Blanchard
2009-05-26 18:06 ` [PATCH] " Frederic Weisbecker
2009-05-27 9:28 ` Xiao Guangrong
2009-05-27 14:22 ` Thomas Gleixner
2009-05-27 14:48 ` Frederic Weisbecker
2009-05-29 0:55 ` [PATCH] tracing/events: Add timer and high res timertracepoints Zhaolei
2009-05-27 13:46 ` [PATCH] tracing/events: Add timer and high res timer tracepoints Thomas Gleixner
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