From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758869AbZCPSc7 (ORCPT ); Mon, 16 Mar 2009 14:32:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753234AbZCPScb (ORCPT ); Mon, 16 Mar 2009 14:32:31 -0400 Received: from hera.kernel.org ([140.211.167.34]:47039 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754494AbZCPSca (ORCPT ); Mon, 16 Mar 2009 14:32:30 -0400 Message-ID: <49BE9B0D.8080807@kernel.org> Date: Mon, 16 Mar 2009 11:31:41 -0700 From: Yinghai Lu User-Agent: Thunderbird 2.0.0.19 (X11/20081227) MIME-Version: 1.0 To: "H. Peter Anvin" 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> <49BE98FB.9050406@zytor.com> In-Reply-To: <49BE98FB.9050406@zytor.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org H. Peter Anvin wrote: > 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. > or find_early_table_space() has some problem? that estimating could be oversized ... YH