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io_uring: add fast path for io_run_local_work()
author
Pavel Begunkov
<asml.silence@gmail.com>
Thu, 8 Sep 2022 15:56:56 +0000
(16:56 +0100)
committer
Jens Axboe
<axboe@kernel.dk>
Wed, 21 Sep 2022 19:15:01 +0000
(13:15 -0600)
We'll grab uring_lock and call __io_run_local_work() with several
atomics inside even if there are no task works. Skip it if ->work_llist
is empty.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Dylan Yudaken <dylany@fb.com>
Link:
https://lore.kernel.org/r/f6a885f372bad2d77d9cd87341b0a86a4000c0ff.1662652536.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_uring/io_uring.c
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diff --git
a/io_uring/io_uring.c
b/io_uring/io_uring.c
index
12e8acd
..
4334664
100644
(file)
--- a/
io_uring/io_uring.c
+++ b/
io_uring/io_uring.c
@@
-1208,6
+1208,9
@@
int io_run_local_work(struct io_ring_ctx *ctx)
bool locked;
int ret;
+ if (llist_empty(&ctx->work_llist))
+ return 0;
+
locked = mutex_trylock(&ctx->uring_lock);
ret = __io_run_local_work(ctx, locked);
if (locked)