On 07/21/2016 08:01 AM, Hannes Reinecke wrote: > On 07/21/2016 07:54 AM, Christoph Hellwig wrote: >> On Tue, Jul 19, 2016 at 04:02:56PM +0200, Hannes Reinecke wrote: >>> Some devices (most notably SMR drives) support only >>> one I/O stream eg for ensuring ordered I/O submission. >>> This patch adds a new block queue flag >>> 'BLK_QUEUE_SINGLE' to support these devices. >> >> We'll need a blk-mq implementation of this flag as well before it can >> be merged. >> > Yes, indeed. Will be fixed for the next round of submissions. > Hmm. Looking closer do I _really_ need that for blk-mq? >From my understanding any hctx can only run on one dedicated cpu, to which the hctx is bound. So if we only have one CPU serving that hctx how can we have several concurrent calls to queue_rq() here? Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@xxxxxxx +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
