Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750710AbWEVKzD (ORCPT ); Mon, 22 May 2006 06:55:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750714AbWEVKzD (ORCPT ); Mon, 22 May 2006 06:55:03 -0400 Received: from linux01.gwdg.de ([134.76.13.21]:51854 "EHLO linux01.gwdg.de") by vger.kernel.org with ESMTP id S1750710AbWEVKzB (ORCPT ); Mon, 22 May 2006 06:55:01 -0400 Date: Mon, 22 May 2006 12:54:51 +0200 (MEST) From: Jan Engelhardt To: Avi Kivity cc: Michael Buesch , Pau Garcia i Quiles , linux-kernel@vger.kernel.org Subject: Re: [IDEA] Poor man's UPS In-Reply-To: <44717424.4020705@argo.co.il> Message-ID: References: <200605212131.47860.pgquiles@elpauer.org> <20060521193803.GG8250@redhat.com> <200605212146.30342.mb@bu3sch.de> <44717424.4020705@argo.co.il> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 794 Lines: 21 >> You really want a system, which freezes for 10-20 seconds every 5 minutes, >> and thaws again when the image is written? > > The snapshot could be taken in the background, by marking all pages read-only, > starting a thread to write them to disk, and continuing normal processing. > > Such systems have been implemented in the past, see for example > http://www.eros-os.org/. > Another one is VMware's background snapshot feature. Granted, it writes "quite much" (IMO) to disk, but it's better than a foreground snapshot. :) Jan Engelhardt -- - 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/