From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754546Ab3IFPPg (ORCPT ); Fri, 6 Sep 2013 11:15:36 -0400 Received: from mail-vb0-f43.google.com ([209.85.212.43]:41922 "EHLO mail-vb0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752510Ab3IFPPe (ORCPT ); Fri, 6 Sep 2013 11:15:34 -0400 Date: Fri, 6 Sep 2013 11:15:26 -0400 From: Tejun Heo To: Wanpeng Li Cc: rjw@sisk.pl, lenb@kernel.org, tglx@linutronix.de, mingo@elte.hu, hpa@zytor.com, akpm@linux-foundation.org, trenn@suse.de, yinghai@kernel.org, jiang.liu@huawei.com, wency@cn.fujitsu.com, laijs@cn.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com, izumi.taku@jp.fujitsu.com, mgorman@suse.de, minchan@kernel.org, mina86@mina86.com, gong.chen@linux.intel.com, vasilis.liaskovitis@profitbricks.com, lwoodman@redhat.com, riel@redhat.com, jweiner@redhat.com, prarit@redhat.com, zhangyanfei@cn.fujitsu.com, x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-acpi@vger.kernel.org Subject: Re: [PATCH 00/11] x86, memblock: Allocate memory near kernel image before SRAT parsed. Message-ID: <20130906151526.GA22423@mtj.dyndns.org> References: <1377596268-31552-1-git-send-email-tangchen@cn.fujitsu.com> <20130904192215.GG26609@mtj.dyndns.org> <52299935.0302450a.26c9.ffffb240SMTPIN_ADDED_BROKEN@mx.google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <52299935.0302450a.26c9.ffffb240SMTPIN_ADDED_BROKEN@mx.google.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, Wanpeng. On Fri, Sep 06, 2013 at 04:58:11PM +0800, Wanpeng Li wrote: > What's the root reason memblock alloc from high to low? To reduce > fragmentation or ... Because low memory tends to be more precious, it's just easier to pack everything towards the top so that we don't have to worry about which zone to use for allocation and fallback logic. Thanks. -- tejun