From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965076AbVKOXiH (ORCPT ); Tue, 15 Nov 2005 18:38:07 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965078AbVKOXiG (ORCPT ); Tue, 15 Nov 2005 18:38:06 -0500 Received: from mail.suse.de ([195.135.220.2]:60848 "EHLO mx1.suse.de") by vger.kernel.org with ESMTP id S965076AbVKOXiF (ORCPT ); Tue, 15 Nov 2005 18:38:05 -0500 From: Andi Kleen To: Mel Gorman Subject: Re: [PATCH 2/5] Light Fragmentation Avoidance V20: 002_usemap Date: Wed, 16 Nov 2005 00:36:53 +0100 User-Agent: KMail/1.8.2 Cc: linux-mm@kvack.org, mingo@elte.hu, lhms-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, nickpiggin@yahoo.com.au References: <20051115164946.21980.2026.sendpatchset@skynet.csn.ul.ie> <20051115164957.21980.8731.sendpatchset@skynet.csn.ul.ie> In-Reply-To: <20051115164957.21980.8731.sendpatchset@skynet.csn.ul.ie> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200511160036.54461.ak@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tuesday 15 November 2005 17:49, Mel Gorman wrote: > This patch adds a "usemap" to the allocator. Each bit in the usemap indicates > whether a block of 2^(MAX_ORDER-1) pages are being used for kernel or > easily-reclaimed allocations. This enumerates two types of allocations; This will increase cache line footprint, which is costly. Why can't this be done in the page flags? -Andi