From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422655AbXCGJ3f (ORCPT ); Wed, 7 Mar 2007 04:29:35 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1422660AbXCGJ3f (ORCPT ); Wed, 7 Mar 2007 04:29:35 -0500 Received: from rgminet01.oracle.com ([148.87.113.118]:54255 "EHLO rgminet01.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1422655AbXCGJ3c (ORCPT ); Wed, 7 Mar 2007 04:29:32 -0500 Date: Wed, 7 Mar 2007 01:29:03 -0800 From: Bill Irwin To: Andrew Morton Cc: Ingo Molnar , Nick Piggin , Linux Memory Management , Linux Kernel , Benjamin Herrenschmidt , "Paolo 'Blaisorblade' Giarrusso" Subject: Re: [patch 4/6] mm: merge populate and nopage into fault (fixes nonlinear) Message-ID: <20070307092903.GJ18774@holomorphy.com> Mail-Followup-To: Bill Irwin , Andrew Morton , Ingo Molnar , Nick Piggin , Linux Memory Management , Linux Kernel , Benjamin Herrenschmidt , Paolo 'Blaisorblade' Giarrusso References: <20070221023656.6306.246.sendpatchset@linux.site> <20070221023735.6306.83373.sendpatchset@linux.site> <20070306225101.f393632c.akpm@linux-foundation.org> <20070307070853.GB15877@wotan.suse.de> <20070307081948.GA9563@wotan.suse.de> <20070307082755.GA25733@elte.hu> <20070307003520.08b1a082.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070307003520.08b1a082.akpm@linux-foundation.org> User-Agent: Mutt/1.5.11 X-Brightmail-Tracker: AAAAAQAAAAI= X-Brightmail-Tracker: AAAAAQAAAAI= X-Whitelist: TRUE X-Whitelist: TRUE Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 7 Mar 2007 09:27:55 +0100 Ingo Molnar wrote: >> btw., if we decide that nonlinear isnt worth the continuing maintainance >> pain, we could internally implement/emulate sys_remap_file_pages() via a >> call to mremap() and essentially deprecate it, without breaking the ABI >> - and remove all the nonlinear code. (This would split fremap areas into >> separate vmas) On Wed, Mar 07, 2007 at 12:35:20AM -0800, Andrew Morton wrote: > I'm rather regretting having merged it - I don't think it has been used for > much. > Paolo's UML speedup patches might use nonlinear though. Guess what major real-life application not only uses nonlinear daily but would even be very happy to see it extended with non-vma-creating protections and more? It's not terribly typical for things to be truncated while remap_file_pages() is doing its work, though it's been proposed as a method of dynamism. It won't stress remap_file_pages() vs. truncate() in any meaningful way, though, as userspace will be rather diligent about clearing in-use data out of the file offset range to be truncated away anyway, and all that via O_DIRECT. -- wli