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io_uring: notification completion optimisation

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We want to use all optimisations that we have for io_uring requests like
completion batching, memory caching and more but for zc notifications.
Fortunately, notification perfectly fit the request model so we can
overlay them onto struct io_kiocb and use all the infratructure.

Most of the fields of struct io_notif natively fits into io_kiocb, so we
replace struct io_notif with struct io_kiocb carrying struct
io_notif_data in the cmd cache line. Then we adapt io_alloc_notif() to
use io_alloc_req()/io_alloc_req_refill(), and kill leftovers of hand
coded caching. __io_notif_complete_tw() is converted to use io_uring's
tw infra.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9e010125175e80baf51f0ca63bdc7cc6a4a9fa56.1658913593.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2022-07-27 10:30:41 +01:00
committed by Jens Axboe
parent bd1a3783dd
commit 14b146b688
5 changed files with 65 additions and 146 deletions
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4
io_uring/net.c
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@@ -946,7 +946,7 @@ int io_sendzc(struct io_kiocb *req, unsigned int issue_flags)
struct io_ring_ctx *ctx = req->ctx;
struct io_sendzc *zc = io_kiocb_to_cmd(req);
struct io_notif_slot *notif_slot;
struct io_notif *notif;
struct io_kiocb *notif;
struct msghdr msg;
struct iovec iov;
struct socket *sock;
@@ -1005,7 +1005,7 @@ int io_sendzc(struct io_kiocb *req, unsigned int issue_flags)
min_ret = iov_iter_count(&msg.msg_iter);
msg.msg_flags = msg_flags;
msg.msg_ubuf = &notif->uarg;
msg.msg_ubuf = &io_notif_to_data(notif)->uarg;
msg.sg_from_iter = io_sg_from_iter;
ret = sock_sendmsg(sock, &msg);