linux-kernel - Re: [PATCH -tip 6/7] perf probe: Show accessible global variables

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Date:	Fri, 22 Oct 2010 14:31:25 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, 2nddept-manager@....hitachi.co.jp,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH -tip  6/7] perf probe: Show accessible global variables

(2010/10/22 11:25), Masami Hiramatsu wrote:
> (2010/10/22 5:50), Arnaldo Carvalho de Melo wrote:
>> Em Thu, Oct 21, 2010 at 07:13:35PM +0900, Masami Hiramatsu escreveu:
>>> Add --externs for allowing --vars to show accessible
>>> global(externally defined) variables from a given probe
>>> point too.
>>> This will give you a hint which globals can be accessible
>>> from the probe point.
>>
>> Cool, but perhaps we need to filter out some of the globals? Things
>> like:
> 
> Hmm, yeah. So is that enough to filter out symbols which start with
> __k???tab_ and __crc_ ?
> 
> 
>>
>>                 long unsigned int       __kcrctab_tcp_hashinfo
>>                 long unsigned int       __kcrctab_tcp_proc_register
>>                 long unsigned int       __kcrctab_tcp_proc_unregister
>>                 long unsigned int       __kcrctab_tcp_prot

BTW, with my kernel (yesterday -tip/x86-64/gcc-4.4.4-10),
perf probe doesn't find these __k???tab_ symbols in
dwarf. (but those are still in /proc/kallsyms)
Maybe, something has been changed or it depends on some
config/environment.

Thank you,


-- 
Masami HIRAMATSU
2nd Dept. Linux Technology Center
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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