On Mon, Dec 17, 2018 at 12:08:57PM +0100, Christoph Hellwig wrote: > > > On Mon, Dec 17, 2018 at 06:42:47PM +0800, Ming Lei wrote: > > When requst is added to rq list of sw queue(ctx), the rq may be from > > different hctx, after multi queue mapping is introduced. > > > > So we have to put the request into one per-queue-type list inside > > sw queue, otherwise the request may be dispatched to wrong hw queue. > > Hmm. For one I don't think splitting the lock makes sense even for > split lists. > Second, do we really need different lists, or just take It depends if the driver/existed blk-mq code can work well if one request is dispatched to wrong hctx. > the type into account when dispatching from rq_list? I'm not really This way may be inefficient since the whole list has to be iterated once for finding all requests aimed to one specific hctx. Thanks, Ming
