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io_uring: add fast path for io_run_local_work() 

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>
This commit is contained in:
Pavel Begunkov 2022-09-08 16:56:56 +01:00 committed by Jens Axboe
parent 1f8d5bbe98
commit 7924fdfeea
1 changed files with 3 additions and 0 deletions
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io_uring/io_uring.c
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@ -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)