[PATCH 3/3] io_uring: inform block layer of how many requests we are submitting
From: Jens Axboe <axboe@kernel.dk>
Date: 2021-10-06 23:13:40
Also in:
io-uring
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
The block layer can use this knowledge to make smarter decisions on how to handle the request, if it knows that N more may be coming. Switch to using blk_start_plug_nr_ios() to pass in that information. Signed-off-by: Jens Axboe <axboe@kernel.dk> --- fs/io_uring.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 73135c5c6168..90af264fdac6 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c@@ -316,6 +316,7 @@ struct io_submit_state { bool plug_started; bool need_plug; + unsigned short submit_nr; struct blk_plug plug; };
@@ -7027,7 +7028,7 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, if (state->need_plug && io_op_defs[opcode].plug) { state->plug_started = true; state->need_plug = false; - blk_start_plug(&state->plug); + blk_start_plug_nr_ios(&state->plug, state->submit_nr); } req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd),
@@ -7148,6 +7149,7 @@ static void io_submit_state_start(struct io_submit_state *state, { state->plug_started = false; state->need_plug = max_ios > 2; + state->submit_nr = max_ios; /* set only head, no need to init link_last in advance */ state->link.head = NULL; }
--
2.33.0