linux-kernel - Ftrace: can trace kthread?

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Date:	Thu, 21 Oct 2010 15:55:32 +0800
From:	"Figo.zhang" <zhangtianfei@...dcoretech.com>
To:	Li Zefan <lizf@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Ftrace: can trace kthread?

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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