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authorJens Axboe <axboe@kernel.dk>2021-10-19 09:32:59 -0600
committerJens Axboe <axboe@kernel.dk>2021-10-27 08:43:15 -0600
commit92aff191cc5b15a56d10a7a1a0b4bc5f6e17fcf3 (patch)
treea0bfe0b493d2bae15a7a27a6594804a3e5a246df /block
parentfe6134f66906dfa16d4877cab60106275f48eef7 (diff)
downloadlinux-92aff191cc5b15a56d10a7a1a0b4bc5f6e17fcf3.tar.bz2
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: 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>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index e881e12a2691..7cdb10f96aa6 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -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);