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