linux-kernel - Re: [RFC] [PATCH 7/7] Ftrace plugin for Uprobes

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Message-ID: <y0mhbqr40ja.fsf@fche.csb>
Date:	Tue, 12 Jan 2010 13:54:01 -0500
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	utrace-devel <utrace-devel@...hat.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Maneesh Soni <maneesh@...ibm.com>,
	Mark Wielaard <mjw@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH 7/7] Ftrace plugin for Uprobes


Frederic Weisbecker <fweisbec@...il.com> writes:

> [...]
> This is much more tricky in the case of uprobes as I see two
> ways to work with it:
> - probing on an already running process
> - probing on a process we are about to run
> [...]

As you might expect, in systemtap we've had to figure out this area
some time ago.  We use another utrace consumer called "task finder"
that registers interest in present / future processes, and gives us
kernel-space callbacks when these come and go.  You could merge it or
something like it.

- FChE
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