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=-19.0 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 00332C64E75 for ; Tue, 24 Nov 2020 15:51:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 92FEA206F7 for ; Tue, 24 Nov 2020 15:51:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="YhnhzOvv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390004AbgKXPv0 (ORCPT ); Tue, 24 Nov 2020 10:51:26 -0500 Received: from mail.kernel.org ([198.145.29.99]:50926 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390003AbgKXPv0 (ORCPT ); Tue, 24 Nov 2020 10:51:26 -0500 Received: from localhost.localdomain (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 26A5F2073C; Tue, 24 Nov 2020 15:51:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1606233085; bh=JWAroebb1HCZItIPh9mrc9nfp/6O6+i/SBzDf+inaQ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YhnhzOvvsJpomNu0T5ASHMnDS7sfnVRR/A4efOtlYFr+Cy5T+OtILRGPnMlo6wZez zS85xtQKOXcJYq+o4K6deKVSoQuvzLCNOCyc78a9ALua/2fYfqIytho+5y1Rpi46eO fiv3c6FEaMIuI4mExATX+8kpX/05B5Qfjiwlq/CU= 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 , Li Zefan , Johannes Weiner , Ingo Molnar , Juri Lelli , Vincent Guittot , kernel-team@android.com Subject: [PATCH v4 09/14] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 Date: Tue, 24 Nov 2020 15:50:34 +0000 Message-Id: <20201124155039.13804-10-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201124155039.13804-1-will@kernel.org> References: <20201124155039.13804-1-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 not using cgroup v2 and allow select_fallback_rq() to figure out the mask by itself. Cc: Li Zefan Cc: Tejun Heo Cc: Johannes Weiner Reviewed-by: Quentin Perret Signed-off-by: Will Deacon --- kernel/cgroup/cpuset.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 57b5b5d0a5fd..e970737c3ed2 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -3299,9 +3299,11 @@ void cpuset_cpus_allowed(struct task_struct *tsk, struct cpumask *pmask) void cpuset_cpus_allowed_fallback(struct task_struct *tsk) { + if (!is_in_v2_mode()) + return; /* select_fallback_rq will try harder */ + rcu_read_lock(); - do_set_cpus_allowed(tsk, is_in_v2_mode() ? - task_cs(tsk)->cpus_allowed : cpu_possible_mask); + do_set_cpus_allowed(tsk, task_cs(tsk)->cpus_allowed); rcu_read_unlock(); /* -- 2.29.2.454.gaff20da3a2-goog