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

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Message-Id: <200710300656.38220.borntraeger@de.ibm.com>
Date:	Tue, 30 Oct 2007 06:56:38 +0100
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	Ingo Molnar <mingo@...e.hu>, Frans Pop <elendil@...net.nl>,
	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

Am Montag, 29. Oktober 2007 schrieb Balbir Singh:
> We'll also need this additional patch (untested), 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

This is similar to what s390 and ppc64 do when CONFIG_VIRT_CPU_ACCOUNTING is 
set. Whenever you do a patch, please make sure to not break the already 
precise values for utime and stime on s390 and ppc. Feel free to CC me 
whenever you have a patch for this.

Christian
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