linux-kernel - Re: [Bug] ARM 'perf' regression by commit a43cb95d5

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Message-ID: <CACVXFVP56EJb0BZ+w6hVAukQ-mN0e0Jn_GLw3XqXQqMwVGfNdA@mail.gmail.com>
Date:	Fri, 17 May 2013 17:48:23 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Will Deacon <will.deacon@....com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Bug] ARM 'perf' regression by commit a43cb95d5

On Fri, May 17, 2013 at 5:36 PM, Will Deacon <will.deacon@....com> wrote:
>
> It's probably easier if you choose a workload, otherwise it's difficult to
> see what is `correct' and what is broken. For example, your broken output
> seems to be in the smsc95xx driver, so assumedly there's a bunch of
> networking going on whereas your other output is in cpuidle_enter_state.

If all modules are removed, the result will become OK. And if I only insert one
module, the top sample will fall inside the only module, but I am sure
nothing is working on the symbols of the module.

>
> We need an apples-for-apples comparison if you think there's a bug in the
> kernel. Can you try profiling hackbench or something?
>
>> Or could anyone else try to verify the problem on their own environment?
>
> How are you running perf top?

sudo perf top

Thanks
--
Ming Lei
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