io_uring: rearrange io_kiocb fields for better caching (0415767e) · Commits · 戴 / test

We've got extra 8 bytes in the 2nd cacheline, put ->fixed_file_refs there, so inline execution path mostly doesn't touch the 3rd cacheline for fixed_file requests as well. Signed-off-by:

Pavel Begunkov <asml.silence@gmail.com> Signed-off-by:

Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -713,14 +713,13 @@ struct io_kiocb {
		u64 user_data;

		struct io_kiocb *link;
		struct percpu_ref *fixed_file_refs;

		/*
		* 1. used with ctx->iopoll_list with reads/writes
		* 2. to track reqs with ->files (see io_op_def::file_table)
		*/
		struct list_head inflight_entry;

		struct percpu_ref *fixed_file_refs;
		struct callback_head task_work;
		/* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */
		struct hlist_node hash_node;

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