linux-kernel - Re: [PATCH -v2] ftrace: Documentation

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Date:	Mon, 14 Jul 2008 18:26:43 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Elias Oltmanns <eo@...ensachen.de>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Clark Williams <clark.williams@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jon Masters <jonathan@...masters.org>
Subject: Re: [PATCH -v2] ftrace: Documentation

Steven Rostedt <rostedt@...dmis.org> writes:

> Actually it is a /debug (or /sys/mount/debug if you prefer) file.

Got it.  I haven't ever actually seen anyone use debugfs.

> I'd be interested in knowing who would want namespaces in traces. I've
> basically only used tracing to see "what's happening in the kernel here?".
> Where I only use the pid to differentiate between the tasks I know are
> running.

> Hence, tracing is much like printk. Does it really matter with these
> outputs. But ftrace is pluggable, pid namespaces may matter in future
> plugins.

So it would not be hard to capture the pid namespace in mount or
even look at current to get it (although the last is a little odd).

I'm not at all certain if it makes sense.  If this is something
an ordinary user could use then we definitely want to do something.

Is tracing possible without inserting kernel modules?

Eric
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