From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Kleen Subject: Re: WTH is going on with memory hotplug sysf interface (was: Re: [RFC PATCH] mm, hotplug: get rid of auto_online_blocks) Date: Mon, 13 Mar 2017 16:16:04 -0700 Message-ID: <20170313231604.GF32070@tassilo.jf.intel.com> References: <20170302142816.GK1404@dhcp22.suse.cz> <20170302180315.78975d4b@nial.brq.redhat.com> <20170303082723.GB31499@dhcp22.suse.cz> <20170303183422.6358ee8f@nial.brq.redhat.com> <20170306145417.GG27953@dhcp22.suse.cz> <20170307134004.58343e14@nial.brq.redhat.com> <20170309125400.GI11592@dhcp22.suse.cz> <20170310135807.GI3753@dhcp22.suse.cz> <20170310155333.GN3753@dhcp22.suse.cz> <20170313151100.GS31518@dhcp22.suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20170313151100.GS31518@dhcp22.suse.cz> Sender: linux-acpi-owner@vger.kernel.org To: Michal Hocko Cc: Igor Mammedov , Heiko Carstens , Vitaly Kuznetsov , linux-mm@kvack.org, Andrew Morton , Greg KH , "K. Y. Srinivasan" , David Rientjes , Daniel Kiper , linux-api@vger.kernel.org, LKML , linux-s390@vger.kernel.org, xen-devel@lists.xenproject.org, linux-acpi@vger.kernel.org, qiuxishi@huawei.com, toshi.kani@hpe.com, xieyisheng1@huawei.com, slaoub@gmail.com, iamjoonsoo.kim@lge.com, vbabka@suse.cz, Zhang Zhen , Reza Arbab , Yasuaki Ishimatsu , Tang Chen List-Id: linux-api@vger.kernel.org > and ARCH_SPARSEMEM_DEFAULT is enabeld on 64b. So I guess whatever was > the reason to add this code back in 2006 is not true anymore. So I am > really wondering. Do we absolutely need to assign pages which are not > onlined yet to the ZONE_NORMAL unconditionally? Why cannot we put them > out of any zone and wait for memory online operation to put them where > requested? I don't remember any specific reason. May have just been simplification. Should be fine to use any zone. -Andi