On Mon, Jan 19, 2015 at 04:49:37AM +0000, Xunlei Pang wrote: > cpu_active_mask is rarely changeable, so remove this operation > to gain a little performance. > > If there is a change in cpu_active_mask, rq_online_dl() and > rq_offline_dl() should take care of it normally, so cpudl:: > free_cpus carries enough information for us. > > For the rare case(causing a task put onto a dying cpu) which > rq_offline_dl() can't handle timely, then it can be handled > through _cpu_down()->...->multi_cpu_stop()->migration_call() > ->migrate_tasks(), preventing the task from hanging on the > dead cpu.
Maybe; I'll need to go crawl through the long and twisted history of active_mask here :/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
