Re: [ck] [REPORT] 2.6.21.1 vs 2.6.21-sd046 vs 2.6.21-cfs-v6

[William Lee Irwin III <wli@holomorphy.com>]

> William Lee Irwin III wrote:
On Thu, May 03, 2007 at 09:42:51AM +0300, Al Boldi wrote:
>         sched_rr_get_interval(0, &ts);
>         printf("pid %d, prio %3d, interval of %d nsec\n", getpid(), getpriority(PRIO_PROCESS, 0), ts.tv_nsec);

Oh dear. What are you trying to figure out from the task's timeslice?
That's not even meaningful in cfs.


On Thu, May 03, 2007 at 09:42:51AM +0300, Al Boldi wrote:
>         start = last = stamp();
>         while(1) {
>                 cur = stamp();
>                 delta = cur-last;
>                 if (delta > thresh_ticks) {
> 			act = last - start;
>                         printf("pid %d, prio %3d, out for %4llu ms, ran for %4llu ms, load %3llu%\n"
> 			, getpid(), getpriority(PRIO_PROCESS, 0), delta/1000, act/1000,(act*100)/(cur-start));
>                         start = cur = stamp();
>                 }
>                 last = cur;
>         }
> 
>         return 0;
> }

This is looking for scheduling latencies, which are necessarily O(tasks).
This is not the way to do it.


-- wli
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