linux-kernel - Re: ftrace not working?

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Date:	Mon, 23 Mar 2009 17:08:53 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Nikanth Karthikesan <knikanth@...e.de>
Cc:	kosaki.motohiro@...fujitsu.com,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: ftrace not working?

Hi

> I tried ftrace with the linus git 2.6.29 rc-6, & rc-8, but I always seem to
> get empty trace! Am I doing something wrong?
> 
> This is what I did.
> 
> linux-glcc:/data/git/linux-2.6 # cd /sys/kernel/debug/tracing/
> linux-glcc:/sys/kernel/debug/tracing # cat available_tracers 
> function_graph function sysprof sched_switch nop
> linux-glcc:/sys/kernel/debug/tracing # echo sched_switch > current_tracer 
> linux-glcc:/sys/kernel/debug/tracing # echo 1 > tracing_enabled 
> linux-glcc:/sys/kernel/debug/tracing # cat tracing_enabled 
> 1
> linux-glcc:/sys/kernel/debug/tracing # cat trace
> # tracer: sched_switch
> #
> #           TASK-PID    CPU#    TIMESTAMP  FUNCTION
> #              | |       |          |         |

your operation seems fine and your .config seems fine too.
but my box works ftrace well on 2.6.29-rc8.

hmm...

Could you post followin operation result and dmesg?

# cat failures
# cat current_tracer
# cat trace_options
# cat buffer_size_kb
# cat dyn_ftrace_total_info
# cat trace_options
# cat set_ftrace_filter
# cat tracing_cpumask
# cat tracing_enabled
# cat tracing_on



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