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 DEE42C6FD18 for ; Tue, 18 Apr 2023 12:41:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231429AbjDRMlE (ORCPT ); Tue, 18 Apr 2023 08:41:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57428 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231849AbjDRMk6 (ORCPT ); Tue, 18 Apr 2023 08:40:58 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 10EC213C3E for ; Tue, 18 Apr 2023 05:40:56 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 8E80463314 for ; Tue, 18 Apr 2023 12:40:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A2D98C433EF; Tue, 18 Apr 2023 12:40:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1681821656; bh=RESM5sRyCRV1MtcyIY+rAu/env00VQhbSL6eg2cYeLA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mjPRgO4IkVRqJHhyQ5FAOFOxd5OqUSS21nvEVFS+HUULQUIK0AXLXylm9ketD6yIr 8NpeUZI+bu8shYYHWMt2Y5CxP/njgz1ZzXGiSQJL7pgJDGH1YlwpEo4LSVM4F3peU4 tChsQ9tnuOUfKshMrgDgVyga5fOfUXD/8mzHbhno= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Waiman Long , Tejun Heo , Sasha Levin Subject: [PATCH 5.15 84/91] cgroup/cpuset: Skip spread flags update on v2 Date: Tue, 18 Apr 2023 14:22:28 +0200 Message-Id: <20230418120308.475525213@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230418120305.520719816@linuxfoundation.org> References: <20230418120305.520719816@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Waiman Long [ Upstream commit 18f9a4d47527772515ad6cbdac796422566e6440 ] Cpuset v2 has no spread flags to set. So we can skip spread flags update if cpuset v2 is being used. Also change the name to cpuset_update_task_spread_flags() to indicate that there are multiple spread flags. Signed-off-by: Waiman Long Signed-off-by: Tejun Heo Stable-dep-of: 42a11bf5c543 ("cgroup/cpuset: Make cpuset_fork() handle CLONE_INTO_CGROUP properly") Signed-off-by: Sasha Levin --- kernel/cgroup/cpuset.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index fb895eaf3a7c3..3d254498eb275 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -450,11 +450,15 @@ static void guarantee_online_mems(struct cpuset *cs, nodemask_t *pmask) /* * update task's spread flag if cpuset's page/slab spread flag is set * - * Call with callback_lock or cpuset_rwsem held. + * Call with callback_lock or cpuset_rwsem held. The check can be skipped + * if on default hierarchy. */ -static void cpuset_update_task_spread_flag(struct cpuset *cs, +static void cpuset_update_task_spread_flags(struct cpuset *cs, struct task_struct *tsk) { + if (cgroup_subsys_on_dfl(cpuset_cgrp_subsys)) + return; + if (is_spread_page(cs)) task_set_spread_page(tsk); else @@ -1941,7 +1945,7 @@ static void update_tasks_flags(struct cpuset *cs) css_task_iter_start(&cs->css, 0, &it); while ((task = css_task_iter_next(&it))) - cpuset_update_task_spread_flag(cs, task); + cpuset_update_task_spread_flags(cs, task); css_task_iter_end(&it); } @@ -2274,7 +2278,7 @@ static void cpuset_attach(struct cgroup_taskset *tset) WARN_ON_ONCE(set_cpus_allowed_ptr(task, cpus_attach)); cpuset_change_task_nodemask(task, &cpuset_attach_nodemask_to); - cpuset_update_task_spread_flag(cs, task); + cpuset_update_task_spread_flags(cs, task); } /* -- 2.39.2