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SubjectRe: [PATCH: 2.6.18.1] delayacct: cpu_count in taskstats updated correctly
On Thu, 26 Oct 2006, David Rientjes wrote:
> I don't see a cpu_delay, I see a cpu_delay_total. This is the CPU's
> cumulative delay and is only accessible through the user-space accounting
> program Documentation/accounting/getdelays.c. It reports the number of
> delay values recorded and the real total, virtual total, and delay total;
> each of these are cumulative.

Yes, I reread the docs more carefully. You are right, and I was wrong.

> In the use case for cpu_count, taking the difference of two successive
> cpu_count readings as reported by getdelays.c would find the number of
> delays experienced in that interval. This is described in the program's
> documentation so by definition the count must be cumulative. It is also
> possible to find the average delay but dividing cpu_delay_total by
> cpu_count.
>
> The original code is correct and accumulation is appropriate.

Thanks for setting me straight. I withdraw the patch.

Martin
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