On Fri, Aug 11, 2017 at 3:57 AM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote: > On Mon, Aug 07, 2017 at 09:39:53AM -0700, Dave Jiang wrote: >> Adding blk-mq support to the pmem driver in addition to the direct bio >> support. > > Can you explain why this is only done for pmem and not btt and nd_blk? I'm skeptical that we can get a dma offload benefit for those drivers since we need to metadata updates and block-window management after each I/O. Whether those drivers would benefit from an mq conversion is a separate question, but the driving motivation for the conversion has been that it's easier to send a 'struct request' to a dma engine than a bio. -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
