From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266386AbUGBCoe (ORCPT ); Thu, 1 Jul 2004 22:44:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266389AbUGBCoe (ORCPT ); Thu, 1 Jul 2004 22:44:34 -0400 Received: from holomorphy.com ([207.189.100.168]:5563 "EHLO holomorphy.com") by vger.kernel.org with ESMTP id S266386AbUGBCod (ORCPT ); Thu, 1 Jul 2004 22:44:33 -0400 Date: Thu, 1 Jul 2004 19:44:22 -0700 From: William Lee Irwin III To: David Gibson , Oleg Nesterov , linux-kernel@vger.kernel.org, Andrew Morton , Linus Torvalds Subject: Re: [BUG] hugetlb MAP_PRIVATE mapping vs /dev/zero Message-ID: <20040702024422.GG21066@holomorphy.com> Mail-Followup-To: William Lee Irwin III , David Gibson , Oleg Nesterov , linux-kernel@vger.kernel.org, Andrew Morton , Linus Torvalds References: <40E43BDE.85C5D670@tv-sign.ru> <20040702012012.GC5937@zax> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040702012012.GC5937@zax> User-Agent: Mutt/1.5.5.1+cvs20040105i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 01, 2004 at 08:29:18PM +0400, Oleg Nesterov wrote: >> We can fix hugetlbfs_file_mmap() or read_zero_pagealigned() >> or both. On Fri, Jul 02, 2004 at 11:20:12AM +1000, David Gibson wrote: > Err... surely we need to fix both, yes? No. /dev/zero is innocent. hugetlb is demanding VM_SHARED semantics without actually setting VM_SHARED. /dev/zero tripping over its nonstandard pagetable structure is not something to be dealt with in /dev/zero itself. -- wli