From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 50CFDC433F5 for ; Thu, 21 Apr 2022 13:45:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1386686AbiDUNsL (ORCPT ); Thu, 21 Apr 2022 09:48:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58820 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1386713AbiDUNsJ (ORCPT ); Thu, 21 Apr 2022 09:48:09 -0400 Received: from mail-wr1-x42e.google.com (mail-wr1-x42e.google.com [IPv6:2a00:1450:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CA564AE6C for ; Thu, 21 Apr 2022 06:45:18 -0700 (PDT) Received: by mail-wr1-x42e.google.com with SMTP id w4so6738170wrg.12 for ; Thu, 21 Apr 2022 06:45:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=UjsMf0ynl8TMQUrKEb47A/zKSS6svNcRYfX66VLmhAs=; b=Whqhiqh1z4BuuCGadKTaBQ1LYsg7rPUOvF+2kyhNOJPNUXRWirevcYPKGB1YhrGAah cL5ynh/JksByjBky0f1K8g9Dbt0svTzY9NGnLLp1IPXgLO8xk64ZwoDZP/qTXUQr290W 1FPZSYA7cnDjhR8CW7PfIhUY62eDmBWjgYLTSFKSjZrfQWNRY6DkHmH1DJsMJaWpur90 nFBy6wSdbK3eB191lS4QfsyvjAdZWrZzlXMSIm/bFRoQa6CKO8d/SioUCH+a06AbzbyT cfU0awaWhksRPJBlyN22+pbxptvRRXYjp3CKR0s9QZov7QwrKPChMeTvH8v19CjgaZ4K rD1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=UjsMf0ynl8TMQUrKEb47A/zKSS6svNcRYfX66VLmhAs=; b=wwGJoQJbqAOTdz+cdh553z9ZJvLNzkUVu6caAcq9/vZfkiaIE3djUlLjQw4GpxnCiU +lpP5Z8LJwHMp5f43rcScfsjjqTwarKXo7Ew0yHQvCEUzCV86Q5jYe60fHW3niiAm5r1 5izX1pdZYrDCs7hU8i5PFYJobnPwHCUNZZLFznnJb8P1e52uEnU4dJQHISzeb22mdhws hhDblm2k3Ay4swwxqF6yjxXtM2swqlT7pJIMj9Iv3ZC5tAowwv3UOiUiR8z6Qc1K0VbC rj+XS03+mMK3WO+H+TVKGP9vHihZGOojZx89DRmJwwRpNLtmpf68R9KhAT+0DLAnHaBm ekvA== X-Gm-Message-State: AOAM531ZeVl5ZsZM8UQ3k0EY0m9y/WPhhO8tVbZQDwL6TdOMMZqFXMOz BLfZ80LNFXUfcop+SnBxEmQtXuqCioo= X-Google-Smtp-Source: ABdhPJwjmfUGyyjFKaiXgyYLJ7ULpPz7fgP/Jqr2klniFgjwGLAZNt1q3T44b+Stb6djb7IBIlx6YA== X-Received: by 2002:a5d:584c:0:b0:20a:821a:b393 with SMTP id i12-20020a5d584c000000b0020a821ab393mr20266717wrf.141.1650548717225; Thu, 21 Apr 2022 06:45:17 -0700 (PDT) Received: from 127.0.0.1localhost ([148.252.129.218]) by smtp.gmail.com with ESMTPSA id m7-20020adfe0c7000000b002060e7bbe49sm2837821wri.45.2022.04.21.06.45.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Apr 2022 06:45:16 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org Cc: Jens Axboe , asml.silence@gmail.com Subject: [RFC 10/11] io_uring: remove priority tw list Date: Thu, 21 Apr 2022 14:44:23 +0100 Message-Id: <03a8a348c2508ed710397906ce1867dc50e63f01.1650548192.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Not for upstreaming. Remove it for experimenting Signed-off-by: Pavel Begunkov --- fs/io_uring.c | 61 +++++++-------------------------------------------- 1 file changed, 8 insertions(+), 53 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 6397348748ad..51b6ee2b70f2 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -508,7 +508,6 @@ struct io_uring_task { spinlock_t task_lock; struct io_wq_work_list task_list; - struct io_wq_work_list prior_task_list; struct file **registered_rings; bool task_running; }; @@ -2483,42 +2482,6 @@ static inline void ctx_commit_and_unlock(struct io_ring_ctx *ctx) io_cqring_ev_posted(ctx); } -static void handle_prev_tw_list(struct io_wq_work_node *node, - struct io_ring_ctx **ctx, bool *uring_locked) -{ - if (*ctx && !*uring_locked) - spin_lock(&(*ctx)->completion_lock); - - do { - struct io_wq_work_node *next = node->next; - struct io_kiocb *req = container_of(node, struct io_kiocb, - io_task_work.node); - - prefetch(container_of(next, struct io_kiocb, io_task_work.node)); - - if (req->ctx != *ctx) { - if (unlikely(!*uring_locked && *ctx)) - ctx_commit_and_unlock(*ctx); - - ctx_flush_and_put(*ctx, uring_locked); - *ctx = req->ctx; - /* if not contended, grab and improve batching */ - *uring_locked = mutex_trylock(&(*ctx)->uring_lock); - if (unlikely(!*uring_locked)) - spin_lock(&(*ctx)->completion_lock); - } - if (likely(*uring_locked)) - req->io_task_work.func(req, uring_locked); - else - __io_req_complete_post(req, req->cqe.res, - io_put_kbuf_comp(req)); - node = next; - } while (node); - - if (unlikely(!*uring_locked)) - ctx_commit_and_unlock(*ctx); -} - static void handle_tw_list(struct io_wq_work_node *node, struct io_ring_ctx **ctx, bool *locked) { @@ -2550,27 +2513,21 @@ void io_uring_task_work_run(void) return; while (1) { - struct io_wq_work_node *node1, *node2; + struct io_wq_work_node *node2; spin_lock_irq(&tctx->task_lock); - node1 = tctx->prior_task_list.first; node2 = tctx->task_list.first; INIT_WQ_LIST(&tctx->task_list); - INIT_WQ_LIST(&tctx->prior_task_list); - if (!node2 && !node1) + if (!node2) tctx->task_running = false; spin_unlock_irq(&tctx->task_lock); - if (!node2 && !node1) + if (!node2) break; - if (node1) - handle_prev_tw_list(node1, &ctx, &uring_locked); - if (node2) - handle_tw_list(node2, &ctx, &uring_locked); + handle_tw_list(node2, &ctx, &uring_locked); cond_resched(); - if (data_race(!tctx->task_list.first) && - data_race(!tctx->prior_task_list.first) && uring_locked) + if (data_race(!tctx->task_list.first) && uring_locked) io_submit_flush_completions(ctx); } @@ -2579,7 +2536,6 @@ void io_uring_task_work_run(void) static void io_req_task_work_add(struct io_kiocb *req, bool priority) { - struct io_wq_work_list *list; struct task_struct *tsk = req->task; struct io_uring_task *tctx = tsk->io_uring; struct io_wq_work_node *node; @@ -2591,8 +2547,7 @@ static void io_req_task_work_add(struct io_kiocb *req, bool priority) io_drop_inflight_file(req); spin_lock_irqsave(&tctx->task_lock, flags); - list = priority ? &tctx->prior_task_list : &tctx->task_list; - wq_list_add_tail(&req->io_task_work.node, list); + wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); if (unlikely(atomic_read(&tctx->in_idle))) goto cancel_locked; @@ -2618,7 +2573,8 @@ static void io_req_task_work_add(struct io_kiocb *req, bool priority) spin_lock_irqsave(&tctx->task_lock, flags); cancel_locked: - node = wq_list_merge(&tctx->prior_task_list, &tctx->task_list); + node = tctx->task_list.first; + INIT_WQ_LIST(&tctx->task_list); spin_unlock_irqrestore(&tctx->task_lock, flags); while (node) { @@ -9134,7 +9090,6 @@ static __cold int io_uring_alloc_task_context(struct task_struct *task, task->io_uring = tctx; spin_lock_init(&tctx->task_lock); INIT_WQ_LIST(&tctx->task_list); - INIT_WQ_LIST(&tctx->prior_task_list); return 0; } -- 2.36.0