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[2620:137:e000::1:20]) by mx.google.com with ESMTP id f9-20020a170902ce8900b00163724c3d97si10814471plg.564.2022.06.13.09.59.55; Mon, 13 Jun 2022 10:00:08 -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=@suse.com header.s=susede1 header.b=jKmUvylV; 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=QUARANTINE sp=QUARANTINE dis=NONE) header.from=suse.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244842AbiFMQKC (ORCPT + 99 others); Mon, 13 Jun 2022 12:10:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51822 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243280AbiFMQJ3 (ORCPT ); Mon, 13 Jun 2022 12:09:29 -0400 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 430ED1ABA54; Mon, 13 Jun 2022 07:02:10 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 6CDF121B9C; Mon, 13 Jun 2022 14:02:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1655128928; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=dH96i6OHzwC4qIcatlfFaUeHgKDc3G4KvUuOT69KD6U=; b=jKmUvylV66P3EkHqBQvMGTtVkWvt3Wx/VA/PZBaOos9trJT4344bWhR6bLjSmrFKY20UEl StmiA+zFdv2T74AbHfLh2YLHX7k3Vg9sqDrqaSJPEgdZHIWaU5wTS00B0KEGoy5/XNqkFT UQXWzd05W3OVdfDU/9WRQ8W9KcenvM0= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 19BF0134CF; Mon, 13 Jun 2022 14:02:08 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id soFdBWBDp2JROgAAMHmgww (envelope-from ); Mon, 13 Jun 2022 14:02:08 +0000 Date: Mon, 13 Jun 2022 16:02:06 +0200 From: Michal =?iso-8859-1?Q?Koutn=FD?= To: Tejun Heo Cc: Waiman Long , Zefan Li , Johannes Weiner , Jonathan Corbet , Shuah Khan , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Andrew Morton , Roman Gushchin , Phil Auld , Peter Zijlstra , Juri Lelli , Frederic Weisbecker , Marcelo Tosatti Subject: Re: [PATCH v11 3/8] cgroup/cpuset: Allow no-task partition to have empty cpuset.cpus.effective Message-ID: <20220613140206.GA6910@blackbody.suse.cz> References: <20220510153413.400020-1-longman@redhat.com> <20220510153413.400020-4-longman@redhat.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="/04w6evG8XlLl3ft" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham 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 --/04w6evG8XlLl3ft Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Sun, Jun 12, 2022 at 04:55:13PM -1000, Tejun Heo wrote: > But how would that happen? A lot of other things would break too if that > were to happen. cpuset is a threaded controller where the internal-node-constraint does not hold. So the additional condition for cpuset migrations is IMO warranted (and needed if there's no "fall up"). Michal --/04w6evG8XlLl3ft Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- iHUEARYIAB0WIQTrXXag4J0QvXXBmkMkDQmsBEOquQUCYqdDXAAKCRAkDQmsBEOq uVxRAPwMiG5QiY65xj/WyfY3nCUyKyx+lDQh6bCpufc5IIQORgD9FIrNztTt7lmR ic79LsvKPERP5RiY2PezetNtf5xH9wA= =VnhP -----END PGP SIGNATURE----- --/04w6evG8XlLl3ft--