From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751522AbdG0G51 (ORCPT ); Thu, 27 Jul 2017 02:57:27 -0400 Received: from mx2.suse.de ([195.135.220.15]:41378 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750765AbdG0G5Z (ORCPT ); Thu, 27 Jul 2017 02:57:25 -0400 Date: Thu, 27 Jul 2017 08:56:52 +0200 From: Michal Hocko To: Jerome Glisse Cc: linux-mm@kvack.org, Andrew Morton , Mel Gorman , Vlastimil Babka , Andrea Arcangeli , Reza Arbab , Yasuaki Ishimatsu , qiuxishi@huawei.com, Kani Toshimitsu , slaoub@gmail.com, Joonsoo Kim , Andi Kleen , Daniel Kiper , Igor Mammedov , Vitaly Kuznetsov , LKML , Benjamin Herrenschmidt , Catalin Marinas , Dan Williams , Fenghua Yu , Heiko Carstens , "H. Peter Anvin" , Ingo Molnar , Martin Schwidefsky , Michael Ellerman , Paul Mackerras , Thomas Gleixner , Tony Luck , Will Deacon Subject: Re: [RFC PATCH 0/5] mm, memory_hotplug: allocate memmap from hotadded memory Message-ID: <20170727065652.GE20970@dhcp22.suse.cz> References: <20170726083333.17754-1-mhocko@kernel.org> <20170726210657.GE21717@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170726210657.GE21717@redhat.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed 26-07-17 17:06:59, Jerome Glisse wrote: [...] > This does not seems to be an opt-in change ie if i am reading patch 3 > correctly if an altmap is not provided to __add_pages() you fallback > to allocating from begining of zone. This will not work with HMM ie > device private memory. So at very least i would like to see some way > to opt-out of this. Maybe a new argument like bool forbid_altmap ? OK, I see! I will think about how to make a sane api for that. Thanks! -- Michal Hocko SUSE Labs From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f198.google.com (mail-wr0-f198.google.com [209.85.128.198]) by kanga.kvack.org (Postfix) with ESMTP id 2E7156B025F for ; Thu, 27 Jul 2017 02:57:26 -0400 (EDT) Received: by mail-wr0-f198.google.com with SMTP id x43so34347760wrb.9 for ; Wed, 26 Jul 2017 23:57:26 -0700 (PDT) Received: from mx1.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id p1si17125065wrp.296.2017.07.26.23.57.24 for (version=TLS1 cipher=AES128-SHA bits=128/128); Wed, 26 Jul 2017 23:57:25 -0700 (PDT) Date: Thu, 27 Jul 2017 08:56:52 +0200 From: Michal Hocko Subject: Re: [RFC PATCH 0/5] mm, memory_hotplug: allocate memmap from hotadded memory Message-ID: <20170727065652.GE20970@dhcp22.suse.cz> References: <20170726083333.17754-1-mhocko@kernel.org> <20170726210657.GE21717@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170726210657.GE21717@redhat.com> Sender: owner-linux-mm@kvack.org List-ID: To: Jerome Glisse Cc: linux-mm@kvack.org, Andrew Morton , Mel Gorman , Vlastimil Babka , Andrea Arcangeli , Reza Arbab , Yasuaki Ishimatsu , qiuxishi@huawei.com, Kani Toshimitsu , slaoub@gmail.com, Joonsoo Kim , Andi Kleen , Daniel Kiper , Igor Mammedov , Vitaly Kuznetsov , LKML , Benjamin Herrenschmidt , Catalin Marinas , Dan Williams , Fenghua Yu , Heiko Carstens , "H. Peter Anvin" , Ingo Molnar , Martin Schwidefsky , Michael Ellerman , Paul Mackerras , Thomas Gleixner , Tony Luck , Will Deacon On Wed 26-07-17 17:06:59, Jerome Glisse wrote: [...] > This does not seems to be an opt-in change ie if i am reading patch 3 > correctly if an altmap is not provided to __add_pages() you fallback > to allocating from begining of zone. This will not work with HMM ie > device private memory. So at very least i would like to see some way > to opt-out of this. Maybe a new argument like bool forbid_altmap ? OK, I see! I will think about how to make a sane api for that. Thanks! -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org