Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754595Ab3CRTNY (ORCPT ); Mon, 18 Mar 2013 15:13:24 -0400 Received: from terminus.zytor.com ([198.137.202.10]:38550 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754737Ab3CRTNI (ORCPT ); Mon, 18 Mar 2013 15:13:08 -0400 Message-ID: <514766B7.4070303@zytor.com> Date: Mon, 18 Mar 2013 12:10:47 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4 MIME-Version: 1.0 To: Vivek Goyal CC: Yinghai Lu , "Eric W. Biederman" , Konrad Rzeszutek Wilk , Thomas Gleixner , Ingo Molnar , WANG Chao , linux-kernel@vger.kernel.org Subject: Re: [PATCH] x86, kdump: Set crashkernel_low automatically References: <20130311182655.GB12107@redhat.com> <513E2695.3080707@zytor.com> <513E28B8.3000502@zytor.com> <20130311191031.GD12107@redhat.com> <20130311193824.GA14738@redhat.com> <20130318144603.GA20743@redhat.com> <20130318153348.GA25806@redhat.com> In-Reply-To: <20130318153348.GA25806@redhat.com> X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 600 Lines: 18 On 03/18/2013 08:33 AM, Vivek Goyal wrote: > > Thinking more about it, if ongoing DMA is an issue, then setting up > software iotlb in those areas is also prone to being overwritten by > those DMAs. Hence, reserving memory low where no DMA is setup by first > kernel, seems somewhat safer. > Agreed. We really should reserve some memory low. -hpa -- 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/