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SubjectRe: [patch] voluntary-preempt-2.6.9-rc1-bk4-Q9

* Mark_H_Johnson@raytheon.com <Mark_H_Johnson@raytheon.com> wrote:

> 00000002 0.003ms (+0.000ms): dummy_switch_tasks (schedule)
> 00000002 0.003ms (+0.000ms): schedule (worker_thread)
> 00000002 0.003ms (+0.000ms): schedule (worker_thread)
> 00000002 0.004ms (+0.000ms): schedule (worker_thread)
> 00000002 0.004ms (+0.000ms): schedule (worker_thread)
> 00000002 0.004ms (+0.000ms): schedule (worker_thread)
> 00000002 0.004ms (+0.274ms): schedule (worker_thread)
> 04000002 0.279ms (+0.000ms): __switch_to (schedule)

a quick suggestion: could you add this near the top of sched.c (below
the #include lines):

#define static

this will turn off all inlining and makes the scheduler-internal
functions visible. If there's any scheduler-internal overhead we should
see it. Maybe this is the CR3 flush (switch_mm()) - but 274 usecs is
still excessive ...

Ingo
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