linux-kernel - Re: [PATCHv8 2.6.35-rc4-tip 11/12] perf: perf interface for uprobes

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Message-ID: <20100709054133.GC26884@linux.vnet.ibm.com>
Date:	Fri, 9 Jul 2010 11:11:33 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Mark Wielaard <mjw@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Naren A Devaiah <naren.devaiah@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCHv8 2.6.35-rc4-tip 11/12]  perf: perf interface for
 uprobes

Hi Christoph, 

> > Here is a terminal snapshot of placing, using and removing a probe on a
> > process with pid 3591 (corresponding to zsh)
> 
> Btw, I think this interface is not the most the best one for typical
> uses cases.  To make perf probe support more useful we'll need at least
> a way to create a probe in all intances of a given binary/DSO, and
> a way to run a binary with pre-defined breakpoints.
> 

Yes Peter had already asked for this and we have it in plan.
These are listed in the todos I listed corresponding to file based
probes.

- Allowing probes per-executable/per dso.
- Allowing probes across fork.

I have some thoughts on how to achieve these.

However I am not sure which items I should work first
- file based probes or on
- automatically trigger perf uprobes on high overhead functions 
 that Ingo suggested.

I am not too clear on later so I might as well start thinking on file
based probes.

--
Thanks and Regards
Srikar
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