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[2620:137:e000::1:20]) by mx.google.com with ESMTP id l10-20020aa7d94a000000b004af7147d830si474250eds.195.2023.04.06.07.11.44; Thu, 06 Apr 2023 07:12:10 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="GL7D/8C4"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239053AbjDFOKR (ORCPT + 99 others); Thu, 6 Apr 2023 10:10:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53502 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239103AbjDFOJv (ORCPT ); Thu, 6 Apr 2023 10:09:51 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E776CAD0B for ; Thu, 6 Apr 2023 07:08:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1680790115; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KANTDl9cP5Foo4kRIPvE9J1MD539S2x+RsUY14Y5myk=; b=GL7D/8C42kG2g7grhmGLPqp0XAvYTq2LLJrAYN6YOUC6DaswCRPKMhvCLIGd0vd+P3kRdZ q3NkZN8Ni27tQSIlPgnaLPIg0CzpydtEAOeUmoKRANBeESZTgHSkrWnYvAb2BAERmFqnfQ QsZlyIwyo0+Ve5BqnEDfjzYAg2NFmM0= 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-335-6G4ZrLGKNxeLGG7o1dz7DA-1; Thu, 06 Apr 2023 10:08:32 -0400 X-MC-Unique: 6G4ZrLGKNxeLGG7o1dz7DA-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 424348996E7; Thu, 6 Apr 2023 14:08:32 +0000 (UTC) Received: from [10.22.9.26] (unknown [10.22.9.26]) by smtp.corp.redhat.com (Postfix) with ESMTP id BD84E492C14; Thu, 6 Apr 2023 14:08:31 +0000 (UTC) Message-ID: Date: Thu, 6 Apr 2023 10:08:31 -0400 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.1 Subject: Re: [PATCH 1/3] cgroup/cpuset: Make cpuset_fork() handle CLONE_INTO_CGROUP properly Content-Language: en-US To: Christian Brauner Cc: Tejun Heo , Zefan Li , Johannes Weiner , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Juri Lelli , Dietmar Eggemann , gscrivan@redhat.com References: <20230331145045.2251683-1-longman@redhat.com> <20230331145045.2251683-2-longman@redhat.com> <20230406-vernommen-kurieren-e75f4ee6ea96@brauner> From: Waiman Long In-Reply-To: <20230406-vernommen-kurieren-e75f4ee6ea96@brauner> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 X-Spam-Status: No, score=-2.4 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/6/23 05:45, Christian Brauner wrote: > On Fri, Mar 31, 2023 at 10:50:43AM -0400, Waiman Long wrote: >> By default, the clone(2) syscall spawn a child process into the same >> cgroup as its parent. With the use of the CLONE_INTO_CGROUP flag >> introduced by commit ef2c41cf38a7 ("clone3: allow spawning processes >> into cgroups"), the child will be spawned into a different cgroup which >> is somewhat similar to writing the child's tid into "cgroup.threads". >> >> The current cpuset_fork() method does not properly handle the >> CLONE_INTO_CGROUP case where the cpuset of the child may be different >> from that of its parent. Update the cpuset_fork() method to treat the >> CLONE_INTO_CGROUP case similar to cpuset_attach(). >> >> Since the newly cloned task has not been running yet, its actual >> memory usage isn't known. So it is not necessary to make change to mm >> in cpuset_fork(). >> >> Fixes: ef2c41cf38a7 ("clone3: allow spawning processes into cgroups") >> Signed-off-by: Waiman Long >> --- > Just two nits. I think this needs a Cc stable and it would be nice if > you could give Giuseppe a "Reported-by". The presence of a fixes tag should make this patch picked up by stable. Yes, I will cc stable when I need to update the patch next time. Right, I should have added Reported-by: Giuseppe Scrivano Cheers, Longman