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block: improve logic around when to sort a plug list

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Only do it if we have requests for multiple queues in the same
plug.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-11-27 17:13:56 -07:00
parent 4e6db0f21c
commit ce5b009cff
3 changed files with 20 additions and 5 deletions
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1
include/linux/blkdev.h
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@ -1131,6 +1131,7 @@ struct blk_plug {
struct list_head mq_list; /* blk-mq requests */
struct list_head cb_list; /* md requires an unplug callback */
unsigned short rq_count;
bool multiple_queues;
};
#define BLK_MAX_REQUEST_COUNT 16
#define BLK_PLUG_FLUSH_SIZE (128 * 1024)