Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754808Ab1EDAA7 (ORCPT ); Tue, 3 May 2011 20:00:59 -0400 Received: from smtp-out.google.com ([74.125.121.67]:30044 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752366Ab1EDAA6 (ORCPT ); Tue, 3 May 2011 20:00:58 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=google.com; s=beta; h=date:from:x-x-sender:to:cc:subject:in-reply-to:message-id :references:user-agent:mime-version:content-type; b=X8KZ5XYNExh1IFpKwFPxzFsrOv0zaZXzig6BHwoKjLFK1PPAKk58bqYgl9Ld+TxfLR 7ClTnqQ8bLNzFixPV2eA== Date: Tue, 3 May 2011 17:00:47 -0700 (PDT) From: David Rientjes X-X-Sender: rientjes@chino.kir.corp.google.com To: "H. Peter Anvin" cc: Ingo Molnar , Thomas Gleixner , x86@kernel.org, linux-kernel@vger.kernel.org Subject: Re: [patch v3] x86: allow ZONE_DMA to be configurable In-Reply-To: Message-ID: References: <4DA82F33.7080403@ladisch.de> <4DA8A5CE.2010004@zytor.com> <4DAFAD9F.4020809@zytor.com> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-System-Of-Record: true Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 914 Lines: 21 On Wed, 27 Apr 2011, David Rientjes wrote: > ZONE_DMA is unnecessary for a large number of machines that do not > require addressing in the lower 16MB of memory because they do not use > devices with 16-bit address registers (plus one page byte register). > > This patch allows users to disable ZONE_DMA for x86 if they know they > will not be using such devices with their kernel. > > This prevents the VM from unnecessarily reserving a ratio of memory > (defaulting to 1/256th of system capacity) with lowmem_reserve_ratio > for such allocations when it will never be used. > > Signed-off-by: David Rientjes Peter, is this ready for merge? -- 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/