From: Peter Zijlstra <peterz@infradead.org>
To: "Figo.zhang" <zhangtianfei@leadcoretech.com>
Cc: Yong Zhang <yong.zhang0@gmail.com>,
Li Zefan <lizf@cn.fujitsu.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Steven Rostedt <srostedt@redhat.com>
Subject: Re: Ftrace: can trace kthread?
Date: Thu, 21 Oct 2010 12:12:07 +0200 [thread overview]
Message-ID: <1287655927.3488.100.camel@twins> (raw)
In-Reply-To: <1287651542.2237.17.camel@myhost>
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?
next prev parent reply other threads:[~2010-10-21 10:12 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-21 7:55 Ftrace: can trace kthread? Figo.zhang
2010-10-21 8:10 ` Yong Zhang
2010-10-21 8:21 ` Figo.zhang
2010-10-21 8:39 ` Yong Zhang
2010-10-21 8:44 ` Figo.zhang
2010-10-21 8:54 ` Yong Zhang
2010-10-21 8:59 ` Figo.zhang
2010-10-21 9:08 ` Yong Zhang
2010-10-21 9:52 ` Figo.zhang
2010-10-21 10:08 ` KOSAKI Motohiro
2010-10-21 10:12 ` Peter Zijlstra [this message]
2010-10-21 13:31 ` Steven Rostedt
2010-10-21 13:33 ` Steven Rostedt
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