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 X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 91273C433B4 for ; Wed, 14 Apr 2021 10:48:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6D95E613D1 for ; Wed, 14 Apr 2021 10:48:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233742AbhDNKse (ORCPT ); Wed, 14 Apr 2021 06:48:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42122 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233163AbhDNKsd (ORCPT ); Wed, 14 Apr 2021 06:48:33 -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 A6FF7C061756 for ; Wed, 14 Apr 2021 03:48:12 -0700 (PDT) Received: by mail-wr1-x42e.google.com with SMTP id 12so19423927wrz.7 for ; Wed, 14 Apr 2021 03:48:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=VI1fw/7EK9qWyY0VWzJLFtkCSBonMMUYXtzaKXPeiKA=; b=ieiGAYMRXERBfzofXjPeQS7hZ1R0EYtiKOC3IcZrALTW45mPjD9xsbECfqxEfb+Z/r p4ookxyuNv3fnYrAas7pKEnf6AqF+pkHXvSc4mCWNQh1V7va4qe3vM/sSBHJrT/8EqKJ 0u/Z28tKwh4M3dtStHzqj0Bt0AP4nFJCXPat5WVUNQG1Lb30pEMb2bO58VR3Aqm+znGz ZEL0woOYuFMaXlNItcSRPc2LxsJugWIiUifeh8NwS6kwNp6zelDAUfQinwHl8h5W8Iga 3TKmWvjq8+7GkZWlOZ9wzE2fccqzN7S4GivMX4XDWarJ54ysmX+lWUKlm3AR2KRCXloe 6y1Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=VI1fw/7EK9qWyY0VWzJLFtkCSBonMMUYXtzaKXPeiKA=; b=IBVa7osWgtLZC+f7v/l8YdL2op2cTcDH4YzVU+CQmML8xFlXLEO8Wwu7d1C3fDtxK2 94sKhdaTHn7cuW2HEVa0ZrE34FJegy/kYrdOxcO3KBuNjZjhZidYoXdiwNdK6qtpbOwO 5GOgAKdqNpBP9L9SbstunKqTLZbzQQi1q9eP6QwKg76s1+mNBE+ZMpqDX6Hau6t0GSh/ tcgXRK5+ZCokZX2W9w4Rno+iaHkEgwjc5PyLRdPz4X759S3oQQBZJzOg5iHjvT36sYpd J/r5BtUT4lnfiaQp5zbvKgVYDsys4ADEeLK6+N6ja/tRE8aaAFHVvJmp9LNZDo2kG0NL PX5Q== X-Gm-Message-State: AOAM532M6zKHF0e/+uVgiXV0Z6yu3fItV9OPOZ85y/XW+cUSFL0GgSkc fRyja1MXFmZjD1ynxZmKm9c= X-Google-Smtp-Source: ABdhPJz+HbWVOKKDB3ZcT0zhKHn0MJZe2cQTsl0KRnWTAUihWcfjLpTZwWozUYButqDI0KPjSZNAeg== X-Received: by 2002:a5d:6607:: with SMTP id n7mr33375170wru.146.1618397291466; Wed, 14 Apr 2021 03:48:11 -0700 (PDT) Received: from localhost.localdomain ([148.252.128.163]) by smtp.gmail.com with ESMTPSA id n14sm5003002wmk.5.2021.04.14.03.48.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Apr 2021 03:48:11 -0700 (PDT) From: Pavel Begunkov To: Jens Axboe , io-uring@vger.kernel.org Subject: [PATCH 2/5] io_uring: refactor io_ring_exit_work() Date: Wed, 14 Apr 2021 11:43:51 +0100 Message-Id: <8042ff02416ca0ced8305c30417b635c59ac570a.1618396838.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Don't reinit io_ring_exit_work()'s exit work/completions on each iteration, that's wasteful. Also add list_rotate_left(), so if we failed to complete the task job, we don't try it again and again but defer it until others are processed. Signed-off-by: Pavel Begunkov --- fs/io_uring.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 693fb5c5e58c..6a70bf455c49 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -8601,6 +8601,9 @@ static void io_ring_exit_work(struct work_struct *work) WARN_ON_ONCE(time_after(jiffies, timeout)); } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); + init_completion(&exit.completion); + init_task_work(&exit.task_work, io_tctx_exit_cb); + exit.ctx = ctx; /* * Some may use context even when all refs and requests have been put, * and they are free to do so while still holding uring_lock or @@ -8613,9 +8616,8 @@ static void io_ring_exit_work(struct work_struct *work) node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, ctx_node); - exit.ctx = ctx; - init_completion(&exit.completion); - init_task_work(&exit.task_work, io_tctx_exit_cb); + /* don't spin on a single task if cancellation failed */ + list_rotate_left(&ctx->tctx_list); ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); if (WARN_ON_ONCE(ret)) continue; @@ -8623,7 +8625,6 @@ static void io_ring_exit_work(struct work_struct *work) mutex_unlock(&ctx->uring_lock); wait_for_completion(&exit.completion); - cond_resched(); mutex_lock(&ctx->uring_lock); } mutex_unlock(&ctx->uring_lock); -- 2.24.0