On Wed, Nov 05, 2014 at 04:51:57PM +0800, Wanpeng Li wrote: > Note: dl task can be migrated successfully if rq is offline currently, > however, > I'm still not sure why task_rq(task)->rd->span just include the cpu which the > dl > task previous running on, so cpu_active_mask is used in the patch. > > Peterz, Juri?
So the root domain span is for exclusive cpusets (Documentation/cgroups/cpusets.txt) where we fully separate sets of CPUs and have no load-balancing between the sets. For 'normal' setups the rd->span is the entire machine, but using cpusets you can create more (smaller) domains. Is this what you were asking? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
