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

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Message-ID: <1287655927.3488.100.camel@twins>
Date:	Thu, 21 Oct 2010 12:12:07 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Figo.zhang" <zhangtianfei@...dcoretech.com>
Cc:	Yong Zhang <yong.zhang0@...il.com>, 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, 2010-10-21 at 16:59 +0800, Figo.zhang wrote:
> > I just
> > echo  0 > tracing_enabled
> > echo function > current_tracer
> > echo 374(pid of flush) > set_ftrace_pid
> > echo 1 > tracing_enabled
> > wait some time
> > echo 0 > tracing_enabled
> > cat trace
> > 
> > So I think this answer your question "could kthread be traced?"
> 
> i do it the same of you.

> but i canot trace nothing. 

Your initial attempt had:

        echo kswapd > /sys/kernel/debug/tracing/set_graph_function

have you reset that state?
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