From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-f197.google.com (mail-qt0-f197.google.com [209.85.216.197]) by kanga.kvack.org (Postfix) with ESMTP id D18396B000E for ; Tue, 17 Jul 2018 19:31:10 -0400 (EDT) Received: by mail-qt0-f197.google.com with SMTP id o6-v6so2003765qtp.15 for ; Tue, 17 Jul 2018 16:31:10 -0700 (PDT) Received: from mx1.redhat.com (mx3-rdu2.redhat.com. [66.187.233.73]) by mx.google.com with ESMTPS id i65-v6si1025544qkd.91.2018.07.17.16.31.05 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 17 Jul 2018 16:31:05 -0700 (PDT) Date: Wed, 18 Jul 2018 07:31:00 +0800 From: Baoquan He Subject: Re: [PATCH] mm/page_alloc: Deprecate kernelcore=nn and movable_core= Message-ID: <20180717233100.GH1724@MiWiFi-R3L-srv> References: <20180717131837.18411-1-bhe@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: David Rientjes Cc: mhocko@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, corbet@lwn.net, linux-doc@vger.kernel.org On 07/17/18 at 01:46pm, David Rientjes wrote: > On Tue, 17 Jul 2018, Baoquan He wrote: > > > We can still use 'kernelcore=mirror' or 'movable_node' for the usage > > of hotplug and movable zone. If somebody shows up with a valid usecase > > we can reconsider. > > > > We actively use kernelcore=n%, I had recently added support for the option > in the first place in 4.17. It's certainly not deprecated. Thanks for telling. Just for curiosity, could you tell the scenario you are using kernelcore=n%? Since it evenly spread movable area on nodes, we may not be able to physically hot unplug/plug RAM. Thanks Baoquan