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 0E119C77B7A for ; Mon, 17 Apr 2023 15:37:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230445AbjDQPhn (ORCPT ); Mon, 17 Apr 2023 11:37:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34688 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229580AbjDQPhm (ORCPT ); Mon, 17 Apr 2023 11:37:42 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 47D27CD for ; Mon, 17 Apr 2023 08:37:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1681745819; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=MrXWy3pJuPspjF90P8c2czWUIgbIgkHUy2P9uOqz8bY=; b=KZGji75PVC+3+idNObLHu7F1hrxVBo6fEEBVjd3EMYNKLXpRPGYwx2TadRVBi5U749KwRJ rSPkdZ/JIOGd3A7Aw0A8sHpXGj0Zt4GhkbMjo4j0DJC8OujjBxT3ffc/0unPj/eLiOhJvs D2u3k2rAv4hYzLWhpwmFt2mLvMx0TRg= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-618-UBn8fu6OMKWPEOxF1xWLqQ-1; Mon, 17 Apr 2023 11:36:56 -0400 X-MC-Unique: UBn8fu6OMKWPEOxF1xWLqQ-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id D5FB385C6E3; Mon, 17 Apr 2023 15:36:55 +0000 (UTC) Received: from llong.com (dhcp-17-153.bos.redhat.com [10.18.17.153]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9E6CFC15BA0; Mon, 17 Apr 2023 15:36:55 +0000 (UTC) From: Waiman Long To: Greg Kroah-Hartman , stable@vger.kernel.org Cc: Tejun Heo , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Giuseppe Scrivano , Waiman Long Subject: [PATCH 5.15 1/3] cgroup/cpuset: Skip spread flags update on v2 Date: Mon, 17 Apr 2023 11:36:45 -0400 Message-Id: <20230417153647.3374211-1-longman@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org commit 18f9a4d47527772515ad6cbdac796422566e6440 upstream. 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 --- 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 428820bf141d..a7bbe277ae66 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); } @@ -2270,7 +2274,7 @@ 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); } /* -- 2.31.1