linux-kernel - Re: [stable] 2.6.23 regression: top displaying 9999% CPU usage

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Message-Id: <200710300019.28871.elendil@planet.nl>
Date:	Tue, 30 Oct 2007 00:19:27 +0100
From:	Frans Pop <elendil@...net.nl>
To:	balbir@...ux.vnet.ibm.com
Cc:	Ingo Molnar <mingo@...e.hu>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Chuck Ebbert <cebbert@...hat.com>, Greg KH <greg@...ah.com>,
	stable@...nel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [stable] 2.6.23 regression: top displaying 9999% CPU usage

On Monday 29 October 2007, Balbir Singh wrote:
> We'll also need this additional patch (untested),

OK. Both patches together do the trick. Gave it a nice long test run and got 
no more weirdness.
Tested-by: Frans Pop <elendil@...net.nl>

> but in the long run I think the approach needs to be
>
> 1. Update stime and utime at the time of context switching -- keep it
>    in sync with p->sum_exec_runtime
> 2. Keep track of system/user context at system call entry points

Feel free to send me a patch for testing when you have one.

Cheers,
Frans
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