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[188.28.229.101]) by smtp.gmail.com with ESMTPSA id m1-20020a7bca41000000b003d1de805de5sm39967839wml.16.2023.01.02.19.05.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Jan 2023 19:05:29 -0800 (PST) From: Pavel Begunkov To: io-uring@vger.kernel.org Cc: Jens Axboe , asml.silence@gmail.com Subject: [RFC v2 13/13] io_uring: add io_req_local_work_add wake fast path Date: Tue, 3 Jan 2023 03:04:04 +0000 Message-Id: X-Mailer: git-send-email 2.38.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Don't wake the master task after queueing a deferred tw unless it's currently waiting in io_cqring_wait. Signed-off-by: Pavel Begunkov --- include/linux/io_uring_types.h | 1 + io_uring/io_uring.c | 6 +++++- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h index 1452ff745e5c..332a29cfe076 100644 --- a/include/linux/io_uring_types.h +++ b/include/linux/io_uring_types.h @@ -285,6 +285,7 @@ struct io_ring_ctx { unsigned cached_cq_tail; unsigned cq_entries; + bool cq_waiting; struct io_ev_fd __rcu *io_ev_fd; struct wait_queue_head cq_wait; struct wait_queue_head poll_wq; diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 943032d2fd21..e436fe73becf 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -1275,7 +1275,8 @@ static void io_req_local_work_add(struct io_kiocb *req) io_eventfd_signal(ctx); if (ctx->flags & IORING_SETUP_DEFER_TASKRUN) { - wake_up_state(ctx->submitter_task, TASK_INTERRUPTIBLE); + if (READ_ONCE(ctx->cq_waiting)) + wake_up_state(ctx->submitter_task, TASK_INTERRUPTIBLE); } else { __io_cqring_wake(ctx); } @@ -2565,6 +2566,7 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, if (ctx->flags & IORING_SETUP_DEFER_TASKRUN) { set_current_state(TASK_INTERRUPTIBLE); + smp_store_mb(ctx->cq_waiting, 1); } else { prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, TASK_INTERRUPTIBLE); @@ -2572,6 +2574,8 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, ret = io_cqring_wait_schedule(ctx, &iowq, timeout); __set_current_state(TASK_RUNNING); + WRITE_ONCE(ctx->cq_waiting, 0); + if (ret < 0) break; /* -- 2.38.1