> Martin wrote: >> Matt had proposed having a separate sched_domain tree for each cpuset, which >> made a lot of sense, but seemed harder to do in practice because "exclusive" >> in cpusets doesn't really mean exclusive at all. > > See my comments on this from yesterday on this thread. > > I suspect we don't want a distinct sched_domain for each cpuset, but > rather a sched_domain for each of several entire subtrees of the cpuset > hierarchy, such that every CPU is in exactly one such sched domain, even > though it be in several cpusets in that sched_domain.
Mmmm. The fundamental problem I think we ran across (just whilst pondering, not in code) was that some things (eg ... init) are bound to ALL cpus (or no cpus, depending how you word it); i.e. they're created before the cpusets are, and are a member of the grand-top-level-uber-master-thingummy. How do you service such processes? That's what I meant by the exclusive domains aren't really exclusive. Perhaps Matt can recall the problems better. I really liked his idea, aside from the small problem that it didn't seem to work ;-) > So we have eight cpusets, non-overlapping and covering the entire > system, each with its own sched_domain. But that's the problem ... I think there are *always* cpusets that overlap. Which is sad (fixable?) because it breaks lots of intelligent things we could do. > purposes. I am afraid I've forgotten too much of my math from long long > ago to state this with exactly the right terms. That's OK, so have most of the rest of us, so even if you could remember, it wouldn't help much ;-) M. ------------------------------------------------------- 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
