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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 9AB31C282DD for ; Wed, 8 Jan 2020 16:01:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 78B092070E for ; Wed, 8 Jan 2020 16:01:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727954AbgAHQBJ (ORCPT ); Wed, 8 Jan 2020 11:01:09 -0500 Received: from mx2.suse.de ([195.135.220.15]:38584 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727152AbgAHQBJ (ORCPT ); Wed, 8 Jan 2020 11:01:09 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 145C8AEAF; Wed, 8 Jan 2020 16:01:07 +0000 (UTC) Date: Wed, 8 Jan 2020 17:01:02 +0100 From: Michal =?iso-8859-1?Q?Koutn=FD?= To: Christian Brauner Cc: linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, Tejun Heo , Ingo Molnar , Oleg Nesterov , Johannes Weiner , Li Zefan , Peter Zijlstra , cgroups@vger.kernel.org Subject: Re: [PATCH v2 2/3] clone3: allow spawning processes into cgroups Message-ID: <20200108160102.GA17415@blackbody.suse.cz> References: <20191223061504.28716-1-christian.brauner@ubuntu.com> <20191223061504.28716-3-christian.brauner@ubuntu.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="G4iJoqBmSsgzjUCe" Content-Disposition: inline In-Reply-To: <20191223061504.28716-3-christian.brauner@ubuntu.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --G4iJoqBmSsgzjUCe Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Dec 23, 2019 at 07:15:03AM +0100, Christian Brauner wrote: > This adds support for creating a process in a different cgroup than its > parent. Binding fork and migration together looks useful. > --- a/kernel/cgroup/cgroup.c > +++ b/kernel/cgroup/cgroup.c > @@ -5882,21 +5882,176 @@ void cgroup_fork(struct task_struct *child) > INIT_LIST_HEAD(&child->cg_list); Just a nitpick, I noticed the comment for cgroup_fork should be updated too (generic migration happens in cgroup_post_fork). > --- a/kernel/fork.c > +++ b/kernel/fork.c > [...] > @@ -2279,8 +2278,7 @@ static __latent_entropy struct task_struct *copy_pr= ocess( > write_unlock_irq(&tasklist_lock); > =20 > proc_fork_connector(p); > - cgroup_post_fork(p); > - cgroup_threadgroup_change_end(current); > + cgroup_post_fork(current, p, args); I can see that when CLONE_INTO_CGROUP | CLONE_NEWCGROUP is passed, then the child's cgroup NS will be rooted at parent's css set (copy_namespaces precedes cgroup_post_fork). Wouldn't it make better sense if this flags combination resulted in child's NS rooted in its css set? Michal --G4iJoqBmSsgzjUCe Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEEoQaUCWq8F2Id1tNia1+riC5qSgFAl4V/LkACgkQia1+riC5 qSh7ww/+JtgrB5RnfOwdlpOAFEIzNIFUXCtwsKQCZ+yWH6llH6b4JzLIIjX3S5Eq /99Cm3s9+6TG6Wr534KUcCfml7nToo/efiRjjuf0j0ZAPPR5y9s58s/qqH4oakiD 2j4/FI86+StapFYGv8yJlQ59DZkFoDIYrPu1cYGYVzqcCo0TBSfmIK3kcO6OBA0O Z1aDXQGz0svw5ssVNMpOp/3P74ctvohlNAgYLNELbeMOoR6JFEiVug0kfQh1E8mo pPQUt1wsDNAB81h1i/5JKlkS7uYbIeDsV0i/aRM+2NGs323mDKK9iSm8EBXRhCWX 1Y6+PuBLp7ZRPISsBZT+8jCsAwuBo2y48dw/KORd2BdBpZrxF2yLwRZNC2oRPuWX suMafu+vnI9ompGkrlgs0sFGiYMQiBmM0MtBCYD8MfEiJjPxGn6b17bSBNRxyzOa Jq1SjbPrWGWy/Pz+2CGFJstRJVsISBJbEejmBhDCo9MviK3V+2LDu0mYPvGXzJ/d 2Kgslb9sdTQbSgeIQy+qcn9mWHZAfuyxC5i+7DJ/bE7l4bofN3TmkeFBriq9D4vU NELLJCnhQ7kDFhaTkFzMRrBMbkpG5Och8XfWFQDw4uskjTe8w9nORAsq/HtA/Ldv EHVorBc5qw9PReix/NFxNKD7vQHD0qwqHkG4h9QQbmsrtKB1/lQ= =atMP -----END PGP SIGNATURE----- --G4iJoqBmSsgzjUCe--