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This improves peak performance of message passing by about 5x in some basic testing, with 2 threads just sending messages to each other. Before this change, it was capped at around 700K/sec, with the change it's at over 4M/sec. Signed-off-by: Jens Axboe --- io_uring/msg_ring.c | 27 ++++++++++----------------- 1 file changed, 10 insertions(+), 17 deletions(-) diff --git a/io_uring/msg_ring.c b/io_uring/msg_ring.c index d1f66a40b4b4..e12a9e8a910a 100644 --- a/io_uring/msg_ring.c +++ b/io_uring/msg_ring.c @@ -11,9 +11,9 @@ #include "io_uring.h" #include "rsrc.h" #include "filetable.h" +#include "refs.h" #include "msg_ring.h" - /* All valid masks for MSG_RING */ #define IORING_MSG_RING_MASK (IORING_MSG_RING_CQE_SKIP | \ IORING_MSG_RING_FLAGS_PASS) @@ -21,7 +21,6 @@ struct io_msg { struct file *file; struct file *src_file; - struct callback_head tw; u64 user_data; u32 len; u32 cmd; @@ -73,26 +72,20 @@ static inline bool io_msg_need_remote(struct io_ring_ctx *target_ctx) return current != target_ctx->submitter_task; } -static int io_msg_exec_remote(struct io_kiocb *req, task_work_func_t func) +static int io_msg_exec_remote(struct io_kiocb *req, io_req_tw_func_t func) { struct io_ring_ctx *ctx = req->file->private_data; - struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg); struct task_struct *task = READ_ONCE(ctx->submitter_task); - if (unlikely(!task)) - return -EOWNERDEAD; - - init_task_work(&msg->tw, func); - if (task_work_add(ctx->submitter_task, &msg->tw, TWA_SIGNAL)) - return -EOWNERDEAD; - + __io_req_set_refcount(req, 2); + req->io_task_work.func = func; + io_req_task_work_add_remote(req, task, ctx, IOU_F_TWQ_LAZY_WAKE); return IOU_ISSUE_SKIP_COMPLETE; } -static void io_msg_tw_complete(struct callback_head *head) +static void io_msg_tw_complete(struct io_kiocb *req, struct io_tw_state *ts) { - struct io_msg *msg = container_of(head, struct io_msg, tw); - struct io_kiocb *req = cmd_to_io_kiocb(msg); + struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg); struct io_ring_ctx *target_ctx = req->file->private_data; int ret = 0; @@ -120,6 +113,7 @@ static void io_msg_tw_complete(struct callback_head *head) if (ret < 0) req_set_fail(req); + req_ref_put_and_test(req); io_req_queue_tw_complete(req, ret); } @@ -205,16 +199,15 @@ static int io_msg_install_complete(struct io_kiocb *req, unsigned int issue_flag return ret; } -static void io_msg_tw_fd_complete(struct callback_head *head) +static void io_msg_tw_fd_complete(struct io_kiocb *req, struct io_tw_state *ts) { - struct io_msg *msg = container_of(head, struct io_msg, tw); - struct io_kiocb *req = cmd_to_io_kiocb(msg); int ret = -EOWNERDEAD; if (!(current->flags & PF_EXITING)) ret = io_msg_install_complete(req, IO_URING_F_UNLOCKED); if (ret < 0) req_set_fail(req); + req_ref_put_and_test(req); io_req_queue_tw_complete(req, ret); } -- 2.43.0