From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756047AbbLQCx6 (ORCPT ); Wed, 16 Dec 2015 21:53:58 -0500 Received: from mgwkm04.jp.fujitsu.com ([202.219.69.171]:63565 "EHLO mgwkm04.jp.fujitsu.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753290AbbLQCx5 (ORCPT ); Wed, 16 Dec 2015 21:53:57 -0500 X-SecurityPolicyCheck: OK by SHieldMailChecker v2.3.2 X-SHieldMailCheckerPolicyVersion: FJ-ISEC-20150223 X-SHieldMailCheckerMailID: 897aaab8a8bf447599495fc140a04b24 Subject: Re: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option To: Xishi Qiu , "Izumi, Taku" References: <1449631109-14756-1-git-send-email-izumi.taku@jp.fujitsu.com> <1449631177-14863-1-git-send-email-izumi.taku@jp.fujitsu.com> <56679FDC.1080800@huawei.com> <3908561D78D1C84285E8C5FCA982C28F39F7F4CD@ORSMSX114.amr.corp.intel.com> <5668D1FA.4050108@huawei.com> <56691819.3040105@huawei.com> <566A9AE1.7020001@huawei.com> <56722258.6030800@huawei.com> Cc: "Luck, Tony" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "akpm@linux-foundation.org" , "mel@csn.ul.ie" , "Hansen, Dave" , "matt@codeblueprint.co.uk" From: Kamezawa Hiroyuki Message-ID: <567223A7.9090407@jp.fujitsu.com> Date: Thu, 17 Dec 2015 11:53:27 +0900 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 MIME-Version: 1.0 In-Reply-To: <56722258.6030800@huawei.com> Content-Type: text/plain; charset=iso-2022-jp Content-Transfer-Encoding: 7bit X-TM-AS-MML: disable Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2015/12/17 11:47, Xishi Qiu wrote: > On 2015/12/17 9:38, Izumi, Taku wrote: > >> Dear Xishi, >> >> Sorry for late. >> >>> -----Original Message----- >>> From: Xishi Qiu [mailto:qiuxishi@huawei.com] >>> Sent: Friday, December 11, 2015 6:44 PM >>> To: Izumi, Taku/泉 拓 >>> Cc: Luck, Tony; linux-kernel@vger.kernel.org; linux-mm@kvack.org; akpm@linux-foundation.org; Kamezawa, Hiroyuki/亀澤 寛 >>> 之; mel@csn.ul.ie; Hansen, Dave; matt@codeblueprint.co.uk >>> Subject: Re: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option >>> >>> On 2015/12/11 13:53, Izumi, Taku wrote: >>> >>>> Dear Xishi, >>>> >>>>> Hi Taku, >>>>> >>>>> Whether it is possible that we rewrite the fallback function in buddy system >>>>> when zone_movable and mirrored_kernelcore are both enabled? >>>> >>>> What does "when zone_movable and mirrored_kernelcore are both enabled?" mean ? >>>> >>>> My patchset just provides a new way to create ZONE_MOVABLE. >>>> >>> >>> Hi Taku, >>> > > Hi Taku, > > We can NOT specify kernelcore= "nn[KMG]" and "mirror" at the same time. > So when we use "mirror", in fact, the movable zone is a new zone. I think it is > more appropriate with this name "mirrored zone", and also we can rewrite the > fallback function in buddy system in this case. kernelcore ="mirrored zone" ? BTW, let me confirm. ZONE_NORMAL = mirrored ZONE_MOVABLE = not mirrored. so, the new zone is "not-mirrored" zone. Now, fallback function is movable -> normal -> DMA. As Tony requested, we may need a knob to stop a fallback in "movable->normal", later. Thanks, -Kame