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From: Arun Sharma <asharma@fb.com>
To: <avagin@gmail.com>
Cc: <avagin@openvz.org>, Frederic Weisbecker <fweisbec@gmail.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	<linux-kernel@vger.kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ingo Molnar <mingo@redhat.com>, Paul Mackerras <paulus@samba.org>,
	Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Subject: Re: [PATCH 3/4] trace: add ability to collect call chain of non-current task.
Date: Thu, 15 Dec 2011 16:15:45 -0800	[thread overview]
Message-ID: <4EEA8DB1.6060505@fb.com> (raw)
In-Reply-To: <4EEA45C6.2020106@fb.com>

On 12/15/11 11:08 AM, Arun Sharma wrote:

> I still need to investigate why per-process mode (command line without
> -a) doesn't work. Will send an updated patch once that's fixed.
>

The per-process mode works fine after moving the trace point to be after:

         perf_event_task_sched_in(prev, current);

App developers using this feature here say they're fine not having the 
block vs sleep distinction because they intend to use it with "-g" and 
the callstack makes it obvious which one it was.

If we really need this info, we should be able to derive it in user 
space via perf inject.

  -Arun

  reply	other threads:[~2011-12-16  0:16 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-26 15:55 [PATCH 0/4] trace: add ability to collect call chains of non-current task Andrew Vagin
2011-09-26 15:55 ` [PATCH 1/4] perf: fix counter of ftrace events Andrew Vagin
2011-10-14 19:11   ` Arun Sharma
2011-09-26 15:55 ` [PATCH 2/4] trace: prepare to collect call chains of non-current task Andrew Vagin
2011-09-27 14:02   ` Peter Zijlstra
2011-10-14 19:12   ` Arun Sharma
2011-09-26 15:55 ` [PATCH 3/4] trace: add ability to collect call chain " Andrew Vagin
2011-09-27 14:05   ` Peter Zijlstra
2011-09-27 20:55     ` Frederic Weisbecker
2011-09-28 13:53       ` Andrew Vagin
2011-12-08  2:02       ` Arun Sharma
2011-12-09 11:07         ` Andrey Vagin
2011-12-14 20:14           ` Arun Sharma
2011-12-15 15:19             ` Andrew Vagin
2011-12-15 19:08               ` Arun Sharma
2011-12-16  0:15                 ` Arun Sharma [this message]
2011-09-26 15:55 ` [PATCH 4/4] events: sched_stat_template saves call chains of a target task Andrew Vagin

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