From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1756588Ab3EQQAV (ORCPT <rfc822;w@1wt.eu>);
	Fri, 17 May 2013 12:00:21 -0400
Received: from cam-admin0.cambridge.arm.com ([217.140.96.50]:64540 "EHLO
	cam-admin0.cambridge.arm.com" rhost-flags-OK-OK-OK-OK)
	by vger.kernel.org with ESMTP id S1755783Ab3EQQAV (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Fri, 17 May 2013 12:00:21 -0400
Date: Fri, 17 May 2013 16:59:36 +0100
From: Will Deacon <will.deacon@arm.com>
To: Ming Lei <ming.lei@canonical.com>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Tejun Heo <tj@kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [Bug] ARM 'perf' regression by commit a43cb95d5
Message-ID: <20130517155936.GQ23112@mudshark.cambridge.arm.com>
References: <CACVXFVPjo2dQpYPpqZS8GC8UPNzB5HLURpYm6-g1FOBbSUjDyA@mail.gmail.com>
 <20130517085530.GB22992@mudshark.cambridge.arm.com>
 <CACVXFVPEBXat3bPPuHzV535=xLoRMFd03Kjzp=NUF5E3KCq2=g@mail.gmail.com>
 <20130517093616.GC23112@mudshark.cambridge.arm.com>
 <CACVXFVP56EJb0BZ+w6hVAukQ-mN0e0Jn_GLw3XqXQqMwVGfNdA@mail.gmail.com>
 <20130517095423.GD23112@mudshark.cambridge.arm.com>
 <CACVXFVPJyKrOBk+JjsfCi+aQ8snQ7PsEJVuOnuTkrWBYEnvDtA@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CACVXFVPJyKrOBk+JjsfCi+aQ8snQ7PsEJVuOnuTkrWBYEnvDtA@mail.gmail.com>
User-Agent: Mutt/1.5.21 (2010-09-15)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Fri, May 17, 2013 at 11:07:37AM +0100, Ming Lei wrote:
> On Fri, May 17, 2013 at 5:54 PM, Will Deacon <will.deacon@arm.com> wrote:
> > On Fri, May 17, 2013 at 10:48:23AM +0100, Ming Lei wrote:
> >> On Fri, May 17, 2013 at 5:36 PM, Will Deacon <will.deacon@arm.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.

Ok, I tried to reproduce this on my TC2 with 3.10-rc1 and perf top looks
fine. I also tried loading your spi-altera module and it made no difference.

I'm using a fairly old perf tool (reports its version as 3.5.5).

Will