linux-kernel - Re: [PATCHv7 2.6.35-rc3-tip 11/11] perf: perf interface for uprobes

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Message-ID: <20100702112836.GC20680@linux.vnet.ibm.com>
Date:	Fri, 2 Jul 2010 16:58:36 +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>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv7 2.6.35-rc3-tip 11/11]  perf: perf interface for
 uprobes


> Masami Hiramatsu wrote:
> > Srikar Dronamraju wrote:
> >> perf: perf interface for uprobes
> >>
> >> Changelog from v4: Merged to 2.6.35-rc3-tip.
> >>
> >> Changelog from v3: (addressed comments from Masami Hiramatsu)
> >> 	* Every process id has a different group name.
> >> 	* event name starts with function name.
> >> 	* If vaddr is specified, event name has vaddr appended
> >> 	  along with function name, (this is to avoid subsequent probes
> >> 	  using same event name.)
> >> 	* warning if -p and --list options are used together.
> >>
> >> 	Also dso can either be a short name or absolute path.
> >>
> >> Enhances perf probe to accept pid and user vaddr.
> >> Provides very basic support for uprobes.
> > 
> > It's unsure what will happen if user sets a probe by line number...
> > I'd like to suggest you if need_dwarf && uid, it should show an error message.
> > But other parts are OK for me.
> 
> I've checked that perf probe was stopped by SEGV in convert_name_to_addr() with
> below options.
> 
> # perf probe -u 2403 hoge.c:100

It should have been perf probe -p 2403 hode.c:100 

However I have taken your comment and fixed that part of the code.
So if it uprobe based probes and need_dwarf is set, it errors out.

> 
> because pp->function == NULL.
> 
> Thank you,
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