linux-kernel - Re: [PATCH 1/3] ftrace: add function tracing to single thread

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Date:	Tue, 25 Nov 2008 19:16:47 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frédéric Weisbecker <fweisbec@...il.com>
cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 1/3] ftrace: add function tracing to single thread


On Wed, 26 Nov 2008, Fr?d?ric Weisbecker wrote:

> 2008/11/25 Steven Rostedt <rostedt@...dmis.org>:
> > From: Steven Rostedt <srostedt@...hat.com>
> >
> > Impact: feature to function trace a single thread
> >
> > This patch adds the ability to function trace a single thread.
> > The file:
> >
> >  /debugfs/tracing/set_ftrace_pid
> 
> 
> That's a good idea!
> 
> About the pid, I think they are unique (which is not the case for tgid
> for multiple threads).
> pid are tgid + number of the thread....
> 
> But perhaps I'm wrong....

Hmm, I can see that there could be times we would want to trace all 
threads, and times to trace only a single thread. This should default to 
the tgid.

We could echo in "t:pid" to trace per thread. and just "pid" to trace non 
all threads in a group.

-- Steve

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