linux-kernel - Re: [PATCH] perf/probe: Provide perf interface for uprobes

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Date:	Fri, 13 Apr 2012 22:13:30 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Oleg Nesterov <oleg@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Anton Arapov <anton@...hat.com>
Subject: Re: [PATCH] perf/probe: Provide perf interface for uprobes

Em Fri, Apr 13, 2012 at 03:27:55PM +0900, Masami Hiramatsu escreveu:
> (2012/04/13 0:10), Srikar Dronamraju wrote:
> >>  $ perf probe libc malloc
> >>
> >> 	Makes it even easier to use.
> >>
> >> 	Its just when one asks for something that has ambiguities that
> >> the tool should ask the user to be a bit more precise to remove such
> >> ambiguity.
> >>
> >> 	After all...

> > Another case 
> > perf probe do_fork clone_flags now looks for variable clone_flags in
> > kernel function do_fork.

> > But if we allow to trace perf probe zsh zfree; then 
> > 'perf probe do_fork clone_flags' should it check for do_fork executable
> > or not? If it does check and finds one, and searches for clone_flags
> > function and doesnt find, then should it continue with searching the
> > kernel?

> Agree. I'd like to suggest you to start with only full path support,
> and see, how we can handle abbreviations :)

Agreed, I was just making usability suggestions.

Those can be implemented later, if we agree they ease the tool use.

- Arnaldo
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