linux-kernel - Re: [PATCH 1/2] ftrace: Add task_comm support for trace

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Date:	Thu, 21 May 2009 09:15:51 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Zhaolei <zhaolei@...fujitsu.com>
cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Tom Zanussi <tzanussi@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] ftrace: Add task_comm support for trace_event


On Thu, 21 May 2009, Zhaolei wrote:

> If we use trace_event alone(without function trace, .etc),
> it can't output enough task command information.
> 
> Before patch:
>  # echo 1 > debugfs/tracing/events/sched/sched_switch/enable
>  # cat debugfs/tracing/trace
>  # tracer: nop
>  #
>  #           TASK-PID    CPU#    TIMESTAMP  FUNCTION
>  #              | |       |          |         |
>             <...>-2289  [000] 526276.724790: sched_switch: task bash:2289 [120] ==> sshd:2287 [120]
>             <...>-2287  [000] 526276.725231: sched_switch: task sshd:2287 [120] ==> bash:2289 [120]
>             <...>-2289  [000] 526276.725452: sched_switch: task bash:2289 [120] ==> sshd:2287 [120]
>             <...>-2287  [000] 526276.727181: sched_switch: task sshd:2287 [120] ==> swapper:0 [140]
>            <idle>-0     [000] 526277.032734: sched_switch: task swapper:0 [140] ==> events/0:5 [115]
>             <...>-5     [000] 526277.032782: sched_switch: task events/0:5 [115] ==> swapper:0 [140]
>  ...
> 
> After patch:
>  # tracer: nop
>  #
>  #           TASK-PID    CPU#    TIMESTAMP  FUNCTION
>  #              | |       |          |         |
>              bash-2269  [000] 527347.989229: sched_switch: task bash:2269 [120] ==> sshd:2267 [120]
>              sshd-2267  [000] 527347.990960: sched_switch: task sshd:2267 [120] ==> bash:2269 [120]
>              bash-2269  [000] 527347.991143: sched_switch: task bash:2269 [120] ==> sshd:2267 [120]
>              sshd-2267  [000] 527347.992959: sched_switch: task sshd:2267 [120] ==> swapper:0 [140]
>            <idle>-0     [000] 527348.531989: sched_switch: task swapper:0 [140] ==> events/0:5 [115]
>          events/0-5     [000] 527348.532115: sched_switch: task events/0:5 [115] ==> swapper:0 [140]

Heh, this was on my todo list today. Thanks, I'll suck up this patch, if 
Ingo doesn't get to it first. If he does.

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve
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