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io_uring: rearrange io_kiocb fields for better caching 

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>
This commit is contained in:
Pavel Begunkov 2020-10-27 23:25:38 +00:00 committed by Jens Axboe
parent f2f87370bb
commit 0415767e7f
1 changed files with 1 additions and 2 deletions
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3
fs/io_uring.c
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@ -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;