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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