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>
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@ -1208,6 +1208,9 @@ int io_run_local_work(struct io_ring_ctx *ctx)
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bool locked;
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int ret;
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if (llist_empty(&ctx->work_llist))
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return 0;
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locked = mutex_trylock(&ctx->uring_lock);
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ret = __io_run_local_work(ctx, locked);
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if (locked)
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