On Wed, May 23, 2007 at 08:32:52PM +0200, Ingo Molnar wrote: > > Here's an attempt to extend CFS (v13) to be fair at a group level, > > rather than just at task level. The patch is in a very premature state > > (passes simple tests, smp load balance not supported yet) at this > > point. I am sending it out early to know if this is a good direction > > to proceed. > > cool patch! :-)
Thanks! > > 1. This patch reuses CFS core to achieve fairness at group level also. > > > > To make this possible, CFS core has been abstracted to deal with > > generic schedulable "entities" (tasks, users etc). > > yeah, i like this alot. > > The "struct sched_entity" abstraction looks very clean, and that's the > main thing that matters: it allows for a design that will only cost us > performance if group scheduling is desired. > > If you could do a -v14 port and at least add minimal SMP support: i.e. > it shouldnt crash on SMP, but otherwise no extra load-balancing logic is > needed for the first cut - then i could try to pick all these core > changes up for -v15. (I'll let you know about any other thoughts/details > when i do the integration.) Sure ..I will work on a -v14 port. I would like to target for something which: 1. doesn't break performance/functionality of existing CFS scheduler -if- CONFIG_FAIR_USER_SCHEDULER is disabled. This also means load balance should work as it works today when the config option is disabled. Do you recommend a set of tests that I need to run to ensure there is no regression? I know that there is a bunch of scheduler tests floating around on lkml ..Just need to dig to them (or if someone has all these tests handy on a website, I will download from that site!) 2. Provides fairness at group (user) level at the cost of missing load balance functionaility (missing until I get around to work on it that is). > kernel builds dont really push scheduling micro-costs, rather try > something like 'hackbench.c' to measure that. (kernel builds are of > course one of our primary benchmarks.) sure i will try that on my next version. -- Regards, vatsa ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ ckrm-tech mailing list https://lists.sourceforge.net/lists/listinfo/ckrm-tech
