From: Balbir Singh <balbir@linux.vnet.ibm.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>, Frans Pop <elendil@planet.nl>,
Chuck Ebbert <cebbert@redhat.com>, Greg KH <greg@kroah.com>,
stable@kernel.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [stable] 2.6.23 regression: top displaying 9999% CPU usage
Date: Tue, 30 Oct 2007 11:30:03 +0530 [thread overview]
Message-ID: <4726C863.2070105@linux.vnet.ibm.com> (raw)
In-Reply-To: <200710300656.38220.borntraeger@de.ibm.com>
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
prev parent reply other threads:[~2007-10-30 6:00 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-12 20:31 2.6.23 regression: top displaying 9999% CPU usage Frans Pop
2007-10-12 21:22 ` [stable] " Greg KH
2007-10-13 7:53 ` Frans Pop
2007-10-14 20:36 ` Christian Borntraeger
2007-10-16 8:29 ` Christian Borntraeger
2007-10-16 9:30 ` Balbir Singh
2007-10-16 10:11 ` Frans Pop
2007-10-16 10:38 ` Balbir Singh
2007-10-16 10:34 ` Christian Borntraeger
2007-10-16 12:59 ` Balbir Singh
2007-10-29 12:05 ` Frans Pop
2007-10-29 12:31 ` Balbir Singh
2007-10-29 20:04 ` Ingo Molnar
2007-10-29 20:33 ` Christian Borntraeger
2007-10-29 20:41 ` Ingo Molnar
2007-10-29 21:11 ` Peter Zijlstra
2007-10-29 21:22 ` Frans Pop
2007-10-29 21:43 ` Balbir Singh
2007-10-29 23:19 ` Frans Pop
2007-10-29 23:22 ` Ingo Molnar
2007-10-30 20:22 ` Otavio Salvador
2007-10-29 23:24 ` Balbir Singh
2007-10-30 5:56 ` Christian Borntraeger
2007-10-30 6:00 ` Balbir Singh [this message]
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