Commit 92aff191 authored by Jens Axboe's avatar Jens Axboe
Browse files

block: prefetch request to be initialized 



Now we have the tags available in __blk_mq_alloc_requests_batch(), we
can start fetching the first request cacheline before calling into the
request initialization.

Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20211019153300.623322-4-axboe@kernel.dk


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent fe6134f6

block/blk-mq.c

+1 −0
Original line number Diff line number Diff line
@@ -405,6 +405,7 @@ __blk_mq_alloc_requests_batch(struct blk_mq_alloc_data *data, 
	for (i = 0; tag_mask; i++) {

		if (!(tag_mask & (1UL << i)))

			continue;

		prefetch(tags->static_rqs[tag]);

		tag = tag_offset + i;

		tag_mask &= ~(1UL << i);

		rq = blk_mq_rq_ctx_init(data, tags, tag, alloc_time_ns);