On Tue, 5 Oct 2004, Paul Jackson wrote: > Matthew wrote: > > > > By adding locking and reference counting, and simplifying the way in which > > sched_domains are created, linked, unlinked and eventually destroyed we > > can use sched_domains as the implementation of cpusets. > > I'd be inclined to turn this sideways from what you say. > > Rather, add another couple of properties to cpusets: > > 1) An isolated flag, that guarantees whatever isolation properties > we agree that schedulers, allocators and resource allocators > require between domains, and > > 2) For those cpusets which are so isolated, the option to add > links of some form, between that cpuset, and distinct scheduler, > allocator and/or resource domains. >
Just to make sure we speak the same language: That would lead to three kinds of cpusets: 1-'isolated' cpusets, with maybe a distinct scheduler, allocator and/or resource domains. 2-'exclusive' cpusets (maybe with a better name?), that just don't overlap with other cpusets who have the same parent. 3-'non-exclusive, non isolated' cpusets, with no restriction of any kind. I suppose it would still be possible to create cpusets of type 2 or 3 inside a type-1 cpuset. They would be managed by the scheduler of the parent 'isolated' cpuset. I was thinking that the top cpuset is a particular case of type-1, but actually no. 'isolated' cpusets should probably be at the same level as the top cpuset (who should lose this name, then). How should 'isolated' cpusets be created ? Should the top_cpuset be shrunk to free some CPUs so we have room to create a new 'isolated' cpuset ? Or should 'isolated' cpusets stay inside the top cpuset, that whould have to schedule its processes outside the 'isolated' cpusets ? Should it then be forbidden to cover the whole system with 'isolated' cpusets ? That's a lot of question marks... ------------------------------------------------------- This SF.net email is sponsored by: IT Product Guide on ITManagersJournal Use IT products in your business? Tell us what you think of them. Give us Your Opinions, Get Free ThinkGeek Gift Certificates! Click to find out more http://productguide.itmanagersjournal.com/guidepromo.tmpl _______________________________________________ ckrm-tech mailing list https://lists.sourceforge.net/lists/listinfo/ckrm-tech
