From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752180Ab2BVNbS (ORCPT ); Wed, 22 Feb 2012 08:31:18 -0500 Received: from casper.infradead.org ([85.118.1.10]:54286 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750971Ab2BVNbM convert rfc822-to-8bit (ORCPT ); Wed, 22 Feb 2012 08:31:12 -0500 Message-ID: <1329917459.24994.14.camel@twins> Subject: Re: [RFD] cgroup: about multiple hierarchies From: Peter Zijlstra To: Tejun Heo Cc: Li Zefan , containers@lists.linux-foundation.org, cgroups@vger.kernel.org, Andrew Morton , Kay Sievers , Lennart Poettering , Frederic Weisbecker , linux-kernel@vger.kernel.org, Christoph Hellwig Date: Wed, 22 Feb 2012 14:30:59 +0100 In-Reply-To: <20120221211938.GE12236@google.com> References: <20120221211938.GE12236@google.com> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT X-Mailer: Evolution 3.2.2- Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2012-02-21 at 13:19 -0800, Tejun Heo wrote: > So, I mean, I don't know. What do other people think? Is this a > unnecessary worry? Are people generally happy with the way things > are? Lennart, Kay, what do you guys think? FWIW I'm all for ripping the orthogonal hierarchy crap out, I hate it just about as much as you do judging from your write-up. Yes it will make some people unhappy, but I can live with that since my life will be easier.. :-) I'm not sure on your process hierarchy pie though, I rather like being able to assign tasks to cgroups of my making without having to mirror that in the process hierarchy. Having seen what userspace does (libvirt in particular, I've still managed to not get infected by the systemd crap) its utterly and completely insane. Now I don't think any of my machines actually still have libvirt on it, so I don't care if we break that either ;-) Another thing I dislike about all the cgroup crap is all the dozens of tiny controllers being proposed left right and center. Like WTF isn't the hugetlb controller part of memcg? Its all memory, right? Now I appreciate all this is new and exciting and Linux does the evolutionary development thing so its bound to be a mess sometimes, but shees.. So +1 on just ripping everything apart and trying again.