linux-kernel - Re: Ftrace: can trace kthread?

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Message-ID: <AANLkTikzSZNtTGfOcP-87u+pMZyW8WrdxwV52ZV3f=nX@mail.gmail.com>
Date:	Thu, 21 Oct 2010 16:39:12 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	"Figo.zhang" <zhangtianfei@...dcoretech.com>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: Ftrace: can trace kthread?

On Thu, Oct 21, 2010 at 4:21 PM, Figo.zhang
<zhangtianfei@...dcoretech.com> wrote:
> On Thu, 2010-10-21 at 16:10 +0800, Yong Zhang wrote:
>> On Thu, Oct 21, 2010 at 3:55 PM, Figo.zhang
>> <zhangtianfei@...dcoretech.com> wrote:
>> > hi,
>> >
>> > is it ftrace in 2.6.36-rc8 can trace the kthread?
>>
>> How about the set_ftrace_pid interface?
>>
>
> i try by set_ftrace_pid, it also can't ftrace the kswapd.

Are you sure kswapd got chance to run on your system?

BTW, I can successfully trace bdi_writeback_thread,
# tracer: function
#
#           TASK-PID    CPU#    TIMESTAMP  FUNCTION
#              | |       |          |         |
       flush-8:0-374   [000] 600743.828496: finish_task_switch <-schedule
       flush-8:0-374   [000] 600743.828498: perf_event_task_sched_in
<-finish_task_switch
       flush-8:0-374   [000] 600743.828498: del_timer_sync <-schedule_timeout
       flush-8:0-374   [000] 600743.828499: try_to_del_timer_sync
<-del_timer_sync
       flush-8:0-374   [000] 600743.828499: lock_timer_base
<-try_to_del_timer_sync
       flush-8:0-374   [000] 600743.828499: _spin_lock_irqsave <-lock_timer_base
       flush-8:0-374   [000] 600743.828500: _spin_unlock_irqrestore
<-try_to_del_timer_sync
       flush-8:0-374   [000] 600743.828500: kthread_should_stop
<-bdi_writeback_task

Thanks,
Yong
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