linux-kernel - Re: [GIT PULL 0/5] perf/core improvements and fixes

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Date:	Sat, 15 Oct 2011 11:46:14 -0600
From:	David Ahern <dsahern@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Thomas Jarosch <thomas.jarosch@...ra2net.com>,
	arnaldo.melo@...il.com
Subject: Re: [GIT PULL 0/5] perf/core improvements and fixes



On 10/15/2011 11:04 AM, Ingo Molnar wrote:
> 
> * David Ahern <dsahern@...il.com> wrote:
> 
>> On 10/15/2011 08:59 AM, Ingo Molnar wrote:
>>> Btw., i noticed another weirdness - sometimes after startup i get 
>>> this message:
>>>
>>> /lib64/libc-2.14.90.so was updated, restart the long running apps that use it!                          
>>>
>>> but it was not updated recently:
>>>
>>>  earth5:~/tip/tools/perf> ll /lib64/libc-2.14.90.so
>>>  -rwxr-xr-x 1 root root 2062920 Sep 28 15:11 /lib64/libc-2.14.90.so
>>>  earth5:~/tip/tools/perf> date
>>>  Sat Oct 15 16:59:04 CEST 2011
>>>  earth5:~/tip/tools/perf> uptime
>>>   16:59:08 up 19 days, 21:35, 11 users,  load average: 7.77, 7.48, 3.81
>>
>> I got the impression that comment was relative to when the 
>> processes were started versus prelink touching it. In your case the 
>> mod time of libc is after the uptime of the box.
> 
> Ok, that makes sense. Do we report this in perf report output as 
> well?

It should. The message comes from map__load() when it detects a deleted
mapping such as:

7f9e8d5c7000-7f9e8d5c8000 rw-p 0000c000 fd:02 1046947
 /lib64/libpam.so.0.82.2.#prelink#.cM3f72 (deleted)

I have removed prelink from most of my systems (managed to find one lone
server with the above).

David

> 
> Thanks,
> 
> 	Ingo
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