On Thu, Nov 18, 2021 at 08:18:29AM +0800, Ming Lei wrote: > On Wed, Nov 17, 2021 at 12:41:01PM -0800, Keith Busch wrote: > > On Tue, Nov 16, 2021 at 08:38:04PM -0700, Jens Axboe wrote: > > > If we have a list of requests in our plug list, send it to the driver in > > > one go, if possible. The driver must set mq_ops->queue_rqs() to support > > > this, if not the usual one-by-one path is used. > > > > It looks like we still need to sync with the request_queue quiesce flag. > > Basically it is same with my previous post[1], but the above patch doesn't > handle request queue allocation/freeing correctly in case of BLK_MQ_F_BLOCKING. Thanks for the pointer. I also thought it may be just as well that blocking dispatchers don't get to use the optimized rqlist queueing, which would simplify quiesce to the normal rcu usage.
