i've uploaded an updated O(1) scheduler patch, against 2.5.2-pre9:
http://redhat.com/~mingo/O(1)-scheduler/sched-O1-2.5.2-C1.patch
http://redhat.com/~mingo/O(1)-scheduler/sched-O1-2.4.17-C1.patch
only minimal fixes were added to the code, the goal is to reach a stable
base.
Changelog:
- fixed the mozilla crash, forgot to revert the ->prio value in
setscheduler() which caused a wrong index ... (many thanks go to Pawel
Kot for testing this out.)
- fixed a load balancer bug that would get the runqueue count incorrectly
if there is a RT running. With this fixed a 2-CPU system is completely
usable even if a RT task is taking up 100% CPU time on one of the CPUs.
- fix the sys_sched_yield export in ksyms.c (Davide Libenzi)
- adds an RT event counter to optimize RT scheduling. (Davide, me)
Ingo
Ingo Molnar wrote:
>
> i've uploaded an updated O(1) scheduler patch, against 2.5.2-pre9:
>
> http://redhat.com/~mingo/O(1)-scheduler/sched-O1-2.5.2-C1.patch
> http://redhat.com/~mingo/O(1)-scheduler/sched-O1-2.4.17-C1.patch
>
> only minimal fixes were added to the code, the goal is to reach a stable
> base.
>
Here is some comparaison I have made between vanilla -pre9 and Ingo's C1
patch
using parts of lmbench and variing background process CPU bounded.
Result in short: seems rock solid and really O(1)!
For imformation: running on PentiumII/400MHz 196Mb RAM uniprocessor
(alas!).
--
Luc Van Oostenryck