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=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 B22B7C4743E for ; Tue, 8 Jun 2021 18:03:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9D2DA6139A for ; Tue, 8 Jun 2021 18:03:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234009AbhFHSFr (ORCPT ); Tue, 8 Jun 2021 14:05:47 -0400 Received: from mail.kernel.org ([198.145.29.99]:45370 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234060AbhFHSFo (ORCPT ); Tue, 8 Jun 2021 14:05:44 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E3C8F61377; Tue, 8 Jun 2021 18:03:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623175431; bh=gmXuSd2iyTh8x2keQgbZ8qOFQ3JyIAnvzsqKbezooMQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HwKYx2t5ajD3Xk0nXbE4s0AnJYFcl6WeKVUwVwtttn3dMLLWu6gqaY0c3rQXM/nW5 Plkr1cPTXbT9Y9tvGKmXqEspeCBAyYWW6czuI94VdA3dgIBpCsOTCymmMqAYhxXdsN +mohPrXdYj+GgYJPcQjXG/XYNZ3qUKsGlFyHrVtI4n6BWKV4BQlsSMZWOjxvRl7VI2 d0URnvc6G1oloSX6TZPyiApg30XQkwYFzETwQwLc3TOv54lMnhAVJJz+OwoQNmGoSb x2232wQ5Fq+W0yRvaK8KnlAEDXbFlr2aPf7dqNmzGnhBjayIiiLU+uno/8/SOI42Ut MygQCm347Y1Sg== From: Will Deacon To: linux-arm-kernel@lists.infradead.org Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Will Deacon , Catalin Marinas , Marc Zyngier , Greg Kroah-Hartman , Peter Zijlstra , Morten Rasmussen , Qais Yousef , Suren Baghdasaryan , Quentin Perret , Tejun Heo , Johannes Weiner , Ingo Molnar , Juri Lelli , Vincent Guittot , "Rafael J. Wysocki" , Dietmar Eggemann , Daniel Bristot de Oliveira , Valentin Schneider , Mark Rutland , kernel-team@android.com Subject: [PATCH v9 06/20] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 Date: Tue, 8 Jun 2021 19:02:59 +0100 Message-Id: <20210608180313.11502-7-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210608180313.11502-1-will@kernel.org> References: <20210608180313.11502-1-will@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org If the scheduler cannot find an allowed CPU for a task, cpuset_cpus_allowed_fallback() will widen the affinity to cpu_possible_mask if cgroup v1 is in use. In preparation for allowing architectures to provide their own fallback mask, just return early if we're either using cgroup v1 or we're using cgroup v2 with a mask that contains invalid CPUs. This will allow select_fallback_rq() to figure out the mask by itself. Cc: Tejun Heo Cc: Johannes Weiner Reviewed-by: Quentin Perret Signed-off-by: Will Deacon --- include/linux/cpuset.h | 1 + kernel/cgroup/cpuset.c | 8 ++++++-- 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h index 04c20de66afc..ed6ec677dd6b 100644 --- a/include/linux/cpuset.h +++ b/include/linux/cpuset.h @@ -15,6 +15,7 @@ #include #include #include +#include #include #ifdef CONFIG_CPUSETS diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index a945504c0ae7..6ec7303d5b1f 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -3322,9 +3322,13 @@ void cpuset_cpus_allowed(struct task_struct *tsk, struct cpumask *pmask) void cpuset_cpus_allowed_fallback(struct task_struct *tsk) { + const struct cpumask *cs_mask; + const struct cpumask *possible_mask = task_cpu_possible_mask(tsk); + rcu_read_lock(); - do_set_cpus_allowed(tsk, is_in_v2_mode() ? - task_cs(tsk)->cpus_allowed : cpu_possible_mask); + cs_mask = task_cs(tsk)->cpus_allowed; + if (is_in_v2_mode() && cpumask_subset(cs_mask, possible_mask)) + do_set_cpus_allowed(tsk, cs_mask); rcu_read_unlock(); /* -- 2.32.0.rc1.229.g3e70b5a671-goog