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Message-Id: <200701302025.56787.borntrae@de.ibm.com> Date: Tue, 30 Jan 2007 20:25:56 +0100 From: Christian Borntraeger <borntrae@...ibm.com> To: "Tom Burns" <tom.i.burns@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: Bug: 2.6.15 Process accounting fails to account for small time slice loads (still) On Tuesday 30 January 2007 17:24, you wrote: > The bug described back in 2004 in the following message still seems to exist: > > http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-05/4313.html > > Essentially, it appears that if a process sleeps before it uses up a > complete jiffy then no charge is made to its process accounting table. > > This problem still exists in the same manner in kernel: This is a known limitation of tick based accounting used on most architectures. It was fixed on s390 and using a cpu timer on every context switch. (IIRC ppc is now using this infrastructure as well) see for a http://www.kernel-traffic.org/kernel-traffic/kt20041117_284.html#8 for the first patch in the series. I dont know if there are plans of using the infrastructure on x86 compatible platforms. I also dont know it that is actually easy to implement with x86 hardware. -- Mit freundlichen Grüßen / Best Regards Christian Borntraeger Linux Software Engineer zSeries Linux & Virtualization - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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