block: improve logic around when to sort a plug list

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

Jens Axboe committed 7 years ago

Commit ce5b0091 parent 4e6db0f3 files · +20 −5Browse files

Showing the changes to include/linux/blkdev.h (1 of 3 files). Show all

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@@ -1131,6 +1131,7 @@ struct blk_plug { · 1130 unmodified lines
1131	1131	struct list_head mq_list; /* blk-mq requests */
1132	1132	struct list_head cb_list; /* md requires an unplug callback */
1133	1133	unsigned short rq_count;
	1134	+ bool multiple_queues;
1134	1135	};
1135	1136	#define BLK_MAX_REQUEST_COUNT 16
1136	1137	#define BLK_PLUG_FLUSH_SIZE (128 * 1024)