Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932168AbWESTqy (ORCPT ); Fri, 19 May 2006 15:46:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932191AbWESTqy (ORCPT ); Fri, 19 May 2006 15:46:54 -0400 Received: from jacks.isp2dial.com ([64.142.120.55]:11268 "EHLO jacks.isp2dial.com") by vger.kernel.org with ESMTP id S932168AbWESTqx (ORCPT ); Fri, 19 May 2006 15:46:53 -0400 From: John Kelly To: "Hua Zhong" Cc: "'Eric W. Biederman'" , "'Andrew Morton'" , "'Herbert Poetzl'" , , , , , , , , Subject: Re: [PATCH 0/9] namespaces: Introduction Date: Fri, 19 May 2006 15:45:43 -0400 Message-ID: <200605191945.k4JJjguK012606@isp2dial.com> References: <008201c67b71$fb938db0$493d010a@nuitysystems.com> In-Reply-To: <008201c67b71$fb938db0$493d010a@nuitysystems.com> X-Mailer: Forte Agent 1.93/32.576 English (American) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Hard2Crack: 0.001 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1312 Lines: 37 On Fri, 19 May 2006 11:28:08 -0700, "Hua Zhong" wrote: > how many virtualization technologies Linux should support? > Particularly, does it need to support both OS-level virtualization If users want it. I do. > It seems at least the VM approach is much less risky. It might be helpful > if someone could explain why we need both. A better question is, why can't we have both? I don't have unlimited memory and disk. I need to conserve my resources as much as possible. The one-kernel approach saves memory, leaving more for applications. That's important to me. I don't need to run multiple kernels, and I don't want to. I only want multiple secure operating environments. The one-kernel approach also makes it easy to have all VPS in one disk partition, without the performance penalty of file backed I/O. If the VM approach is truly less risky, seems to me the Xen/VMware developers should be able to succeed independently, despite changes made for in-kernel virtualization. I'm glad someone asked a question I could answer. :-) - 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/