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

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Message-ID: <4726C863.2070105@linux.vnet.ibm.com>
Date:	Tue, 30 Oct 2007 11:30:03 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Christian Borntraeger <borntraeger@...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

Christian Borntraeger wrote:
> 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.
> 

Yes, true. I'll cc everyone on this list and send out the patch as RFC.
Much of this code will be architecture specific and as you rightly
pointed out, needs to happen under !CONFIG_VIRT_CPU_ACCOUNTING

> Christian


-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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