2016-03-30 14:44 GMT+08:00 Peter Zijlstra <pet...@infradead.org>: > On Tue, Mar 29, 2016 at 06:47:22PM -0400, Steven Rostedt wrote: >> I'm looking at some old changes for sched-deadline, and I stumbled >> across this. As I'm working on sched deadline tests, I've discovered >> that they can't have cpu affinity. They are limited to their sched >> domains. That is, sched deadline tasks have whatever affinity that the
root domain I think. >> domain they happen to be in has. >> >> Is there a condition where rq != task_rq(p) and p->nr_cpus_allowed > 1 >> isn't true? > > When holding rq->lock, no. I suppose the patch was just to mirror rt and > someone 'forgot' about the extra constraints on dl tasks. > sched_class::switched_from() methods can drop rq->lock before your great balance_callback patchset. :-) Regards, Wanpeng Li
