linux-kernel - Re: [PATCH v3 2.6.39-rc1-tip 23/26] 23: perf: show possible probes in a given executable file or library.

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Date:	Thu, 7 Apr 2011 04:20:13 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jonathan Corbet <corbet@....net>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	SystemTap <systemtap@...rces.redhat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3 2.6.39-rc1-tip 23/26] 23: perf: show possible probes
 in a given executable file or library.

* Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> [2011-04-04 19:15:11]:

> (2011/04/01 23:37), Srikar Dronamraju wrote:
> > Enhances -F/--funcs option of "perf probe" to list possible probe points in
> > an executable file or library. A new option -e/--exe specifies the path of
> > the executable or library.
> 
> I think you'd better use -x for abbr. of --exe, since -e is used for --event
> for other subcommands.

Okay, 

> 
> And also, it seems this kind of patch should be placed after perf-probe
> uprobe support patch, because without uprobe support, user binary analysis
> is meaningless. (In the result, this introduces -u/--uprobe option without
> uprobe support)
> 

Okay, I can do that, Should we do the listing before or after the uprobe
can place a breakpoint is arguable.

> 
> > Show last 10 functions in /bin/zsh.
> > 
> > # perf probe -F -u -e /bin/zsh | tail
> 
> I also can't understand why -u is required even if we have -x for user
> binaries and -m for kernel modules.
> 

yes, for the listing we can certainly do without -u option.

-- 
Thanks and Regards
Srikar
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