Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759545AbZCSVTs (ORCPT ); Thu, 19 Mar 2009 17:19:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754725AbZCSVTg (ORCPT ); Thu, 19 Mar 2009 17:19:36 -0400 Received: from out02.mta.xmission.com ([166.70.13.232]:36415 "EHLO out02.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754539AbZCSVTf (ORCPT ); Thu, 19 Mar 2009 17:19:35 -0400 To: Ingo Molnar Cc: Oren Laadan , Dave Hansen , linux-api@vger.kernel.org, containers@lists.linux-foundation.org, hpa@zytor.com, linux-kernel@vger.kernel.org, Alexey Dobriyan , linux-mm@kvack.org, viro@zeniv.linux.org.uk, mpm@selenic.com, Andrew Morton , Sukadev Bhattiprolu , Linus Torvalds , tglx@linutronix.de, xemul@openvz.org References: <1236891719.32630.14.camel@bahia> <20090312212124.GA25019@us.ibm.com> <604427e00903122129y37ad791aq5fe7ef2552415da9@mail.gmail.com> <20090313053458.GA28833@us.ibm.com> <20090313193500.GA2285@x200.localdomain> <1236981097.30142.251.camel@nimitz> <49BADAE5.8070900@cs.columbia.edu> <20090314081207.GA16436@elte.hu> From: ebiederm@xmission.com (Eric W. Biederman) Date: Thu, 19 Mar 2009 14:19:15 -0700 In-Reply-To: <20090314081207.GA16436@elte.hu> (Ingo Molnar's message of "Sat\, 14 Mar 2009 09\:12\:07 +0100") Message-ID: User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-XM-SPF: eid=;;;mid=;;;hst=in02.mta.xmission.com;;;ip=67.169.126.145;;;frm=ebiederm@xmission.com;;;spf=neutral X-SA-Exim-Connect-IP: 67.169.126.145 X-SA-Exim-Rcpt-To: mingo@elte.hu, xemul@openvz.org, tglx@linutronix.de, torvalds@linux-foundation.org, sukadev@linux.vnet.ibm.com, akpm@linux-foundation.org, mpm@selenic.com, viro@zeniv.linux.org.uk, linux-mm@kvack.org, adobriyan@gmail.com, linux-kernel@vger.kernel.org, hpa@zytor.com, containers@lists.linux-foundation.org, linux-api@vger.kernel.org, dave@linux.vnet.ibm.com, orenl@cs.columbia.edu X-SA-Exim-Mail-From: ebiederm@xmission.com X-Spam-DCC: XMission; sa01 1397; Body=1 Fuz1=1 Fuz2=1 X-Spam-Combo: ;Ingo Molnar X-Spam-Relay-Country: X-Spam-Report: * -1.8 ALL_TRUSTED Passed through trusted hosts only via SMTP * 0.0 T_TM2_M_HEADER_IN_MSG BODY: T_TM2_M_HEADER_IN_MSG * -2.6 BAYES_00 BODY: Bayesian spam probability is 0 to 1% * [score: 0.0000] * -0.0 DCC_CHECK_NEGATIVE Not listed in DCC * [sa01 1397; Body=1 Fuz1=1 Fuz2=1] * 0.0 XM_SPF_Neutral SPF-Neutral Subject: Re: How much of a mess does OpenVZ make? ;) Was: What can OpenVZ do? X-SA-Exim-Version: 4.2.1 (built Thu, 25 Oct 2007 00:26:12 +0000) X-SA-Exim-Scanned: Yes (on in02.mta.xmission.com) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2088 Lines: 51 Ingo Molnar writes: > * Eric W. Biederman wrote: > >> >> In the OpenVZ case, they've at least demonstrated that the >> >> filesystem can be moved largely with rsync. Unlinked files >> >> need some in-kernel TLC (or /proc mangling) but it isn't >> >> *that* bad. >> > >> > And in the Zap we have successfully used a log-based >> > filesystem (specifically NILFS) to continuously snapshot the >> > file-system atomically with taking a checkpoint, so it can >> > easily branch off past checkpoints, including the file >> > system. >> > >> > And unlinked files can be (inefficiently) handled by saving >> > their full contents with the checkpoint image - it's not a >> > big toll on many apps (if you exclude Wine and UML...). At >> > least that's a start. >> >> Oren we might want to do a proof of concept implementation >> like I did with network namespaces. That is done in the >> community and goes far enough to show we don't have horribly >> nasty code. The patches and individual changes don't need to >> be quite perfect but close enough that they can be considered >> for merging. >> >> For the network namespace that seems to have made a big >> difference. >> >> I'm afraid in our clean start we may have focused a little too >> much on merging something simple and not gone far enough on >> showing that things will work. >> >> After I had that in the network namespace and we had a clear >> vision of the direction. We started merging the individual >> patches and things went well. > > I'm curious: what is the actual end result other than good > looking code? In terms of tangible benefits to the everyday > Linux distro user. [This is not meant to be sarcastic, i'm > truly curious.] Of the network namespace? Sorry I'm not certain what you are asking. Eric -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/