From: Ingo Molnar <mingo@elte.hu>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>,
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>,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [stable] 2.6.23 regression: top displaying 9999% CPU usage
Date: Mon, 29 Oct 2007 21:41:16 +0100 [thread overview]
Message-ID: <20071029204116.GA13026@elte.hu> (raw)
In-Reply-To: <200710292133.48125.borntraeger@de.ibm.com>
* Christian Borntraeger <borntraeger@de.ibm.com> wrote:
> > - return clock_t_to_cputime(utime);
> > + p->prev_utime = max(p->prev_utime, clock_t_to_cputime(utime));
> > + return p->prev_utime;
> > }
> [...]
>
> I dont think it will work. It will make utime monotic, but stime can
> still decrease. For example let sum_exec_runtime increase by a tiny
> little bit while utime will get a full additional tick. stime is
> sum-utime. So stime can still go backwards. So I think that we need
> this kind of logic for stime as well, no?
yeah, probably. Peter?
Ingo
next prev parent reply other threads:[~2007-10-29 20:41 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 [this message]
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
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