Re: SMP scheduling

Andrea Arcangeli (andrea@suse.de)
Sun, 22 Aug 1999 02:35:14 +0200 (CEST)


On Sat, 21 Aug 1999, Jonathan Case Nicklin wrote:

>323c305
>< if (!sched_rt && related(tsk, p))
>---
>> if (related(tsk, p))
>
>All this does is check at the start to see if the process could be
>real-time. Only perform the relation check if the process is not
>real-time. Also, it takes an assignment and an evalutaion out of the lock
>section to reduce time in lock. please let me know if this is there is a
>problem with this approach.

You don't need this on 2.3.15-pre1 (btw as I just pointed out in the past
the related heuristic was implemented wrong).

I would be interested to know if you can reproduce the little performance
drop with my latest scheduler-RT patch applyed on the top of 2.3.15-pre1.

(patch against 2.3.15-pre1)

ftp://ftp.suse.com/pub/people/andrea/kernel-patches/pending-2.3.x/SMP-scheduler-RT-1
ftp://e-mind.com/pub/andrea/kernel-patches/pending-2.3.x/SMP-scheduler-RT-1

Thanks.

Andrea

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