diff mbox series

[3/4] block: prefetch request to be initialized

Message ID 20211019153300.623322-4-axboe@kernel.dk (mailing list archive)
State New, archived
Headers show
Series Last round of alloc side optimizations | expand

Commit Message

Jens Axboe Oct. 19, 2021, 3:32 p.m. UTC 
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: Jens Axboe <axboe@kernel.dk>
---
 block/blk-mq.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/block/blk-mq.c b/block/blk-mq.c
index fbaecb6e6dd4..77c2c3220128 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -389,6 +389,7 @@  __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);