Hi Ming, 2015-06-24 18:46 GMT+09:00 Ming Lei <tom.leim...@gmail.com>: > On Sun, Jun 21, 2015 at 9:52 PM, Akinobu Mita <akinobu.m...@gmail.com> wrote: >> ctx->index_hw is zero for the CPUs which have never been onlined since >> the block queue was initialized. If one of those CPUs is hotadded and >> starts handling request before new mappings are established, pending > > Could you explain a bit what the handling request is? The fact is that > blk_mq_queue_reinit() is run after all queues are put into freezing.
Notifier callbacks for CPU_ONLINE action can be run on the other CPU than the CPU which was just onlined. So it is possible for the process running on the just onlined CPU to insert request and run hw queue before blk_mq_queue_reinit_notify() is actually called with action=CPU_ONLINE. -- 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/
