From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760518AbZCPS1T (ORCPT ); Mon, 16 Mar 2009 14:27:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756168AbZCPS1F (ORCPT ); Mon, 16 Mar 2009 14:27:05 -0400 Received: from terminus.zytor.com ([198.137.202.10]:43548 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753359AbZCPS1E (ORCPT ); Mon, 16 Mar 2009 14:27:04 -0400 Message-ID: <49BE98FB.9050406@zytor.com> Date: Mon, 16 Mar 2009 11:22:51 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.19 (X11/20090105) MIME-Version: 1.0 To: Yinghai Lu CC: Jeremy Fitzhardinge , Ingo Molnar , Linux Kernel Mailing List Subject: Re: [crash] Re: Latest brk patchset References: <49BC413B.5020104@zytor.com> <49BC4CAC.202@goop.org> <49BC4DB6.9070403@zytor.com> <49BCA03D.3020605@goop.org> <20090315203802.GA14625@elte.hu> <49BD70EF.7010204@goop.org> <20090315212854.GA23960@elte.hu> <49BD8F15.4020301@goop.org> <20090316085402.GC1062@elte.hu> <49BE7A84.2030503@goop.org> <49BE84D6.3010006@kernel.org> <49BE9248.6050707@goop.org> <49BE97B0.8000004@kernel.org> In-Reply-To: <49BE97B0.8000004@kernel.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Yinghai Lu wrote: > > need more extra check for INIT_MAP_SIZE calculating... > The original calculation was designed to map enough memory that we could map all of lowmem. That is, two page table levels removed from actual lowmem, which put the overhead in the order of kilobytes (16 K in the wost case.) Something similar is definitely needed. -hpa