linux-kernel - Re: [PATCH 0/8] MSM timer fixes and cleanups

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Message-ID: <4EBC2208.7020102@codeaurora.org>
Date:	Thu, 10 Nov 2011 11:12:08 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	David Brown <davidb@...eaurora.org>
CC:	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Marc Zyngier <marc.zyngier@....com>
Subject: Re: [PATCH 0/8] MSM timer fixes and cleanups

On 11/10/11 10:33, David Brown wrote:
> On Tue, Nov 08, 2011 at 10:34:02AM -0800, Stephen Boyd wrote:
>> Currently the MSM timers use the same physical counter
>> for the clockevent and clocksource. This works as long
>> as the clocksource isn't stopped from ticking during normal
>> operation but unfortunately that isn't the case and the
>> clocksource is stopped when the clockevent is shutdown.
>> Even worse, switching the clocksource via sysfs at runtime will
>> hang the system.
>>
>> This series reorganizes the MSM timer code so that one counter
>> is only used for either a clocksource or a clockevent, and not 
>> both. In the process we reduce the lines of code and fix
>> a few long-standing bugs.
> How do you test these on the upstream kernel?  Booting successfully is
> probably a good starting point, though.
>

Booting is good because that means you're getting timer interrupts.
After that, do some sleep 10, 20, 30, etc. tests with a stopwatch to
make sure that time isn't completely off.

You can also check bogoMIPS and see what the before and after is. Beyond
that I suppose some kind of ntp or gettimeofday test would be good.

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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