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

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Message-ID: <1287650668.2237.12.camel@myhost>
Date:	Thu, 21 Oct 2010 16:44:28 +0800
From:	"Figo.zhang" <zhangtianfei@...dcoretech.com>
To:	Yong Zhang <yong.zhang0@...il.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?


> > 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

are you use my scprit to trace the bdi_writeback_thread ?

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