linux-kernel - Re: [PATCH 2/3] perf symbol: Implement a very simple ELF symbol parser

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Message-ID: <87ioinv9xb.fsf@sejong.aot.lge.com>
Date:	Mon, 10 Nov 2014 15:36:48 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 2/3] perf symbol: Implement a very simple ELF symbol parser

Hi Arnaldo,

On Fri, 7 Nov 2014 12:26:18 -0300, Arnaldo Carvalho de Melo wrote:
> Em Fri, Nov 07, 2014 at 02:20:05PM +0900, Namhyung Kim escreveu:
>> It'll be used to show (userspace) symbol names when libelf isn't (or
>> cannot be) linked.
>
> Does this deals with prelink, etc?

I believe so. :)

>  
>>   # Overhead  Command     Shared Object      Symbol
>>   # ........  ..........  .................  .........................
>>   #
>>       37.01%  mem-memcpy  libc-2.17.so       [.] __memcpy_ssse3_back

  namhyung@...ong:linux$ readelf -WS /lib64/libc-2.17.so | grep prelink
    [41] .gnu.prelink_undo PROGBITS        0000000000000000 200368 000c30 01      0   0  8

  namhyung@...ong:linux$ nm /lib64/libc-2.17.so | grep __memcpy_ssse3_back
  0000003153f46f40 t __memcpy_ssse3_back


Thanks,
Namhyung


>>       24.25%  perf        ld-2.17.so         [.] _dl_relocate_object
>>       22.16%  perf        [kernel.kallsyms]  [k] kmem_cache_alloc
>>       14.29%  mem-memset  libc-2.17.so       [.] __memset_sse2
>>        2.21%  perf        [kernel.kallsyms]  [k] flush_signal_handlers
>>        0.07%  perf        [kernel.kallsyms]  [k] intel_pmu_enable_all
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