Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751226AbVJSTAu (ORCPT ); Wed, 19 Oct 2005 15:00:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751228AbVJSTAu (ORCPT ); Wed, 19 Oct 2005 15:00:50 -0400 Received: from thunk.org ([69.25.196.29]:43231 "EHLO thunker.thunk.org") by vger.kernel.org with ESMTP id S1751226AbVJSTAt (ORCPT ); Wed, 19 Oct 2005 15:00:49 -0400 Date: Wed, 19 Oct 2005 15:00:13 -0400 From: "Theodore Ts'o" To: Hugh Dickins Cc: OBATA Noboru , lkml@oxley.org, pavel@ucw.cz, hyoshiok@miraclelinux.com, linux-kernel@vger.kernel.org Subject: Re: Linux Kernel Dump Summit 2005 Message-ID: <20051019190013.GD10969@thunk.org> Mail-Followup-To: Theodore Ts'o , Hugh Dickins , OBATA Noboru , lkml@oxley.org, pavel@ucw.cz, hyoshiok@miraclelinux.com, linux-kernel@vger.kernel.org References: <200510121002.59098.lkml@oxley.org> <20051018.224722.126577332.noboru.obata.ar@hitachi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1130 Lines: 25 On Tue, Oct 18, 2005 at 03:10:24PM +0100, Hugh Dickins wrote: > On Tue, 18 Oct 2005, OBATA Noboru wrote: > > > > I have a bitter experience in analyzing a partial dump. The > > dump completely lacks the PTE pages of user processes and I had > > to give up analysis then. A partial dump has a risk of failure > > in analysis. > > Page tables of user processes are very often essential in a dump. > Data pages of user processes are almost always just a waste of > space and time in a dump. Please don't judge against partial > dumps on the basis of one that was badly selected. We've had hard-to-reproduce problems out in the field where being able to find the data pages of the user process was critical to figuring out what the heck was going on. So I wouldn't be quite so eager to dismiss the need for user pages. There are times when they come in quite handy.... - Ted - 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/