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

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Date:	Thu, 21 Oct 2010 09:33:43 -0400
From:	Steven Rostedt <srostedt@...hat.com>
To:	"Figo.zhang" <zhangtianfei@...dcoretech.com>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Ftrace: can trace kthread?

Just a quick note. Please send email to my rostedt@...dmis.org address.
I do not check my srostedt@...hat.com address as often.

I know, I know, I have it as my Author tag (but not my signed off by)
and I had to add it to my business card. I just could not be so bold as
to put my goodmis.org address on my Red Hat business card ;-) And there
was no good way to add it as a secondary.

-- Steve

On Thu, 2010-10-21 at 15:55 +0800, Figo.zhang wrote:
> hi,
> 
> is it ftrace in 2.6.36-rc8 can trace the kthread? i want to trace the
> kswapd/bdi_writeback_thread, but not success. i am sure that kswapd is
> running, because i let the system eat huge memory. i can trace some
> function such as __do_fault. what is issue on it? 
> 
> Best,
> Figo.zhang
> 
> 
> here is my ftrace script.
> i = 1
> while true;
> do
> 	echo 1 > /proc/sys/kernel/ftrace_enabled
> 	echo function_graph > /sys/kernel/debug/tracing/current_tracer
> 	echo kswapd > /sys/kernel/debug/tracing/set_graph_function
> 	echo 1 > /sys/kernel/debug/tracing/tracing_on
> 	echo 1 > /sys/kernel/debug/tracing/tracing_enabled
> 	sleep 1
> 	echo 0 > /sys/kernel/debug/tracing/tracing_enabled
> 	cat /sys/kernel/debug/tracing/trace > ftrace.kswap.log.$i
> 
> 	let i=i+1;
> 
> done
> 
> 
> 


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