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block: prefetch request to be initialized

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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>
Link: https://lore.kernel.org/r/20211019153300.623322-4-axboe@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-10-19 09:32:59 -06:00
parent fe6134f669
commit 92aff191cc
1 changed files with 1 additions and 0 deletions
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block/blk-mq.c
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@ -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);