Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757291AbXJOIdJ (ORCPT ); Mon, 15 Oct 2007 04:33:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755050AbXJOIc5 (ORCPT ); Mon, 15 Oct 2007 04:32:57 -0400 Received: from verein.lst.de ([213.95.11.210]:47885 "EHLO verein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754916AbXJOIc4 (ORCPT ); Mon, 15 Oct 2007 04:32:56 -0400 Date: Mon, 15 Oct 2007 10:31:41 +0200 From: Christoph Hellwig To: xfs-masters@oss.sgi.com Cc: Jeremy Fitzhardinge , David Chinner , Nick Piggin , xfs@oss.sgi.com, Xen-devel , Linux Kernel Mailing List , Mark Williamson , Morten B?geskov Subject: Re: [xfs-masters] Re: Interaction between Xen and XFS: stray RW mappings Message-ID: <20071015083141.GA20851@lst.de> References: <470FA7C3.90404@goop.org> <200710151415.07248.nickpiggin@yahoo.com.au> <4712BB05.1020701@goop.org> <200710151726.08387.nickpiggin@yahoo.com.au> <4712E1AA.501@goop.org> <20071015041133.GH995458@sgi.com> <4712EA09.6000102@goop.org> <20071015042546.GI995458@sgi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20071015042546.GI995458@sgi.com> User-Agent: Mutt/1.3.28i X-Spam-Score: 0 () Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 783 Lines: 16 On Mon, Oct 15, 2007 at 02:25:46PM +1000, David Chinner wrote: > > Hm, well I saw the problem with a filesystem made with mkfs.xfs with no > > options, so there must be at least *some* vmapping going on there. > > Sorry - I should have been more precise - vmap should never be used in > performance critical paths on default configs. Log recovery will > trigger vmap/vunmap usage, so this is probably what you are seeing. The iclogs are also vmapped, but they aren't unmapped until unmount so this optimizations doesn't matter either. - 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/