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

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Message-Id: <20081125153104.ecdceed4.akpm@linux-foundation.org>
Date:	Tue, 25 Nov 2008 15:31:04 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, fweisbec@...il.com,
	srostedt@...hat.com
Subject: Re: [PATCH 1/3] ftrace: add function tracing to single thread

On Tue, 25 Nov 2008 18:01:06 -0500 (EST)
Steven Rostedt <rostedt@...dmis.org> wrote:

> 
> On Tue, 25 Nov 2008, Andrew Morton wrote:
> 
> > On Tue, 25 Nov 2008 17:34:22 -0500
> > Steven Rostedt <rostedt@...dmis.org> wrote:
> > 
> > > This patch adds the ability to function trace a single thread.
> > > The file:
> > > 
> > >   /debugfs/tracing/set_ftrace_pid
> > > 
> > > contains the pid to trace.
> > 
> > What happens if the same pid exists in two or more pid namespaces?
> 
> I think we had this discussion before.

Oh.  What did we end up concluding?

> It tests current->pid, would that 
> be different among the name spaces?

I think those are non-unique.  containers@...ts.osdl.org would have
better ideas..

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