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io_uring/net: move mm accounting to a slower path
We can also move mm accounting to the extended callbacks. It removes a few cycles from the hot path including skipping one function call and setting io_req_task_complete as a callback directly. For user backed I/O it shouldn't make any difference taking into considering atomic mm accounting and page pinning. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/1062f270273ad11c1b7b45ec59a6a317533d5e64.1667557923.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -1097,6 +1097,7 @@ int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
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return ret;
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msg.sg_from_iter = io_sg_from_iter;
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} else {
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io_notif_set_extended(zc->notif);
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ret = import_single_range(WRITE, zc->buf, zc->len, &iov,
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&msg.msg_iter);
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if (unlikely(ret))
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@ -1158,6 +1159,8 @@ int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags)
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unsigned flags;
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int ret, min_ret = 0;
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io_notif_set_extended(sr->notif);
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sock = sock_from_file(req->file);
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if (unlikely(!sock))
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return -ENOTSOCK;
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@ -9,11 +9,14 @@
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#include "notif.h"
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#include "rsrc.h"
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static void __io_notif_complete_tw(struct io_kiocb *notif, bool *locked)
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static void io_notif_complete_tw_ext(struct io_kiocb *notif, bool *locked)
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{
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struct io_notif_data *nd = io_notif_to_data(notif);
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struct io_ring_ctx *ctx = notif->ctx;
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if (nd->zc_report && (nd->zc_copied || !nd->zc_used))
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notif->cqe.res |= IORING_NOTIF_USAGE_ZC_COPIED;
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if (nd->account_pages && ctx->user) {
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__io_unaccount_mem(ctx->user, nd->account_pages);
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nd->account_pages = 0;
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@ -21,16 +24,6 @@ static void __io_notif_complete_tw(struct io_kiocb *notif, bool *locked)
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io_req_task_complete(notif, locked);
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}
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static void io_notif_complete_tw_ext(struct io_kiocb *notif, bool *locked)
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{
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struct io_notif_data *nd = io_notif_to_data(notif);
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if (nd->zc_report && (nd->zc_copied || !nd->zc_used))
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notif->cqe.res |= IORING_NOTIF_USAGE_ZC_COPIED;
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__io_notif_complete_tw(notif, locked);
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}
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static void io_tx_ubuf_callback(struct sk_buff *skb, struct ubuf_info *uarg,
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bool success)
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{
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@ -59,11 +52,14 @@ void io_notif_set_extended(struct io_kiocb *notif)
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{
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struct io_notif_data *nd = io_notif_to_data(notif);
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nd->zc_report = false;
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nd->zc_used = false;
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nd->zc_copied = false;
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notif->io_task_work.func = io_notif_complete_tw_ext;
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io_notif_to_data(notif)->uarg.callback = io_tx_ubuf_callback_ext;
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if (nd->uarg.callback != io_tx_ubuf_callback_ext) {
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nd->account_pages = 0;
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nd->zc_report = false;
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nd->zc_used = false;
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nd->zc_copied = false;
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nd->uarg.callback = io_tx_ubuf_callback_ext;
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notif->io_task_work.func = io_notif_complete_tw_ext;
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}
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}
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struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx)
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@ -81,10 +77,9 @@ struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx)
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notif->task = current;
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io_get_task_refs(1);
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notif->rsrc_node = NULL;
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notif->io_task_work.func = __io_notif_complete_tw;
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notif->io_task_work.func = io_req_task_complete;
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nd = io_notif_to_data(notif);
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nd->account_pages = 0;
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nd->uarg.flags = SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN;
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nd->uarg.callback = io_tx_ubuf_callback;
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refcount_set(&nd->uarg.refcnt, 1);
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