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

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Message-ID: <4B4CF0F4.3020706@redhat.com>
Date:	Tue, 12 Jan 2010 17:00:20 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	"Frank Ch. Eigler" <fche@...hat.com>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	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>,
	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

Frank Ch. Eigler wrote:
> 
> 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.

So, could you tell us how the task-finder works and is implemented?
I think we'd better clarify what functions are required for uprobes
and pmu, and I think we may be able to re-implement improved pmu
on utrace.

Thank you,


-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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