linux-kernel - Re: [PATCH 2.6.25-rc3] cpuidle: fix cpuidle time and usage overflow

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Message-ID: <20080225101533.GB30685@elte.hu>
Date:	Mon, 25 Feb 2008 11:15:33 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yi Yang <yi.y.yang@...el.com>
Cc:	akpm@...ux-foundation.org, venkatesh.pallipadi@...el.com,
	cpufreq@...ts.linux.org.uk, linux-pm@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 2.6.25-rc3] cpuidle: fix cpuidle time and usage overflow


* Yi Yang <yi.y.yang@...el.com> wrote:

> cpuidle C-state sysfs node time and usage are very easy to overflow 
> because they are all of unsigned int type, time will overflow within 
> about two hours, usage will take longer time to overflow, but they are 
> increasing for ever.
> 
> This patch will convert them to unsigned long long.

what happens if such an overflow happens - any particular regression or 
other misbehavior, or just funny looking stats in sysfs?

	Ingo
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