Messages in this thread | | | From | Christian Borntraeger <> | Subject | Re: Bug: 2.6.15 Process accounting fails to account for small time slice loads (still) | Date | Tue, 30 Jan 2007 20:25:56 +0100 |
| |
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@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |