linux-kernel - Re: [PATCH 1/2] perf:tools: avoid to create much more maps for kernel symbols on ARM

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Message-ID: <AANLkTi=U4echi4NzKan7uVgdCOEuhg5ZvBoWeqJH1sVT@mail.gmail.com>
Date:	Mon, 29 Nov 2010 12:34:49 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	linux-kernel@...r.kernel.org, Ian Munsie <imunsie@....ibm.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tom Zanussi <tzanussi@...il.com>
Subject: Re: [PATCH 1/2] perf:tools: avoid to create much more maps for kernel
 symbols on ARM

2010/11/25 Ming Lei <tom.leiming@...il.com>:
> 2010/11/24 Arnaldo Carvalho de Melo <acme@...stprotocols.net>:
>> Em Wed, Nov 24, 2010 at 07:35:02PM +0800, tom.leiming@...il.com escreveu:
>>> From: Ming Lei <tom.leiming@...il.com>
>>
>>> On ARM, module addresss space is ahead of kernel space, so the module
>>> symbols are handled before kernel symbol in dso__split_kallsyms, then
>>> cause one map is created for each kernel symbol.
>>
>>> This patch fixes the issue by restoring to original kernel map in
>>> dso__split_kallsyms() to avoid create unnecessary maps for kernel
>>> symbols when starting to handle kenel symbol maps but after module
>>> symbol maps are handled over.
>>
>> Can you try with the following patch instead?
>
> Fine to me.
>
> Reported-and-tested-by: Ming Lei <tom.leiming@...il.com>

Arnaldo, could you queue this one and the patch below

      http://marc.info/?l=linux-kernel&m=129068448714210&w=2

into your tree? Without the two, perf tool can't work well on ARM
if there are modules loaded.

thanks,
-- 
Lei Ming
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