Re: [patch] CFS (Completely Fair Scheduler), v2

[Peter Williams <pwil3058@bigpond.net.au>]

Ingo Molnar wrote:
> this is the second release of the CFS (Completely Fair Scheduler) 
> patchset, against v2.6.21-rc7:
> 
>    http://redhat.com/~mingo/cfs-scheduler/sched-cfs-v2.patch
> 
> i'd like to thank everyone for the tremendous amount of feedback and 
> testing the v1 patch got - i could hardly keep up with just reading the 
> mails! Some of the stuff people addressed i couldnt implement yet, i 
> mostly concentrated on bugs, regressions and debuggability.

Have you considered using rq->raw_weighted_load instead of 
rq->nr_running in calculating fair_clock?  This would take the nice 
value (or RT priority) of the other tasks into account when determining 
what's fair.

Peter
PS You'd have to change the migration thread's load_weight from 0 to 1 
in order to prevent divide by zero without having to explicitly check 
for it every time.
-- 
Peter Williams                                   pwil3058@bigpond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
  -- Ambrose Bierce