linux-kernel - Re: [PATCH 1/3] perf tools: Allow vmlinux to fallback to kallsyms on NO

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Date:	Mon, 10 Nov 2014 07:20:35 -0700
From:	David Ahern <dsahern@...il.com>
To:	Namhyung Kim <namhyung@...nel.org>
CC:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	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>
Subject: Re: [PATCH 1/3] perf tools: Allow vmlinux to fallback to kallsyms
 on NO_LIBELF=1

On 11/10/14, 12:40 AM, Namhyung Kim wrote:
> Hi David,
>
> On Fri, 07 Nov 2014 08:21:16 -0700, David Ahern wrote:
>> On 11/6/14, 10:20 PM, Namhyung Kim wrote:
>>> It worked w/o libelf, but recent change to use vmlinux for kernel
>>> symbols break it.
>>
>> Do you know the recent change (commit id) that broke it?
>
> Nope.  I tried to find it but failed - older versions seems also have
> the problem and some of them could not run perf record.  Anyway it looks
> like depending some external condition and broken for a while. :(

OK. I have a segfault issue when analyzing a mips file offbox and it is 
related to kernel symbol processing. I was not able to find past version 
of perf that worked - though limited by the file version checks added 
around v3.6.

David

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