Re: Ftrace: can trace kthread?

[Peter Zijlstra]

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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