linux-kernel - Re: problems with perf probe and system libraries

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Date:	Wed, 31 Dec 2014 07:18:45 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	David Ahern <dsahern@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: problems with perf probe and system libraries

Hi David,

(2014/12/30 13:21), David Ahern wrote:
> Hi Masami:
> 
> I have been looking at perf-probe again and having a number of problems 
> with top of tree.
> 
> Here's the first one I have isolated:
> 
> $ perf probe -x /lib64/libc-2.18.so -a 'malloc  size=%di'
> Probe point 'malloc' not found.
>    Error: Failed to add events.

It seems to fail when failed to open debuginfo.
I confirmed it on ubuntu 14.04 too.
I'll try to fix that.

Thank you for reporting!

> 
> $ perf probe -x /lib64/libc-2.18.so -F | grep malloc
> malloc
> malloc@plt
> malloc_atfork
> malloc_check
> malloc_consolidate
> malloc_hook_ini
> malloc_info
> malloc_printerr
> mallochook
> ptmalloc_init
> ptmalloc_init.part.8
> ptmalloc_lock_all
> ptmalloc_unlock_all
> ptmalloc_unlock_all2
> tr_mallochook
> 
> $ perf probe -x /lib64/libc-2.18.so -a 'malloc=malloc size=%di'
> Probe point 'malloc' not found.
>    Error: Failed to add events.
> 
> A year ago (v3.12) this worked fine so I did a git bisect which points to:
> 
> commit fb7345bbf7fad9bf72ef63a19c707970b9685812
> Author: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Date:   Thu Dec 26 05:41:53 2013 +0000
> 
>      perf probe: Support basic dwarf-based operations on uprobe events
> 
> I have tried top of tree on Fedora 16, 18 and 20 with a variety of 
> kernels - and a variety of results. Reverting to 
> 8a613d40e389b723fd5889ac8d4033ed4030be31 which is the commit before this 
> one and it works again.
> 
> David
> --
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-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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