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Date: Fri, 9 Jun 2017 12:49:47 +0200 From: Michal Hocko <mhocko@...nel.org> To: Wei Yang <richard.weiyang@...il.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, Linux-MM <linux-mm@...ck.org>, Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>, Andrea Arcangeli <aarcange@...hat.com>, Jerome Glisse <jglisse@...hat.com>, Reza Arbab <arbab@...ux.vnet.ibm.com>, Yasuaki Ishimatsu <yasu.isimatu@...il.com>, qiuxishi@...wei.com, Kani Toshimitsu <toshi.kani@....com>, slaoub@...il.com, Joonsoo Kim <js1304@...il.com>, Andi Kleen <ak@...ux.intel.com>, David Rientjes <rientjes@...gle.com>, Daniel Kiper <daniel.kiper@...cle.com>, Igor Mammedov <imammedo@...hat.com>, Vitaly Kuznetsov <vkuznets@...hat.com>, LKML <linux-kernel@...r.kernel.org>, Balbir Singh <bsingharora@...il.com>, Dan Williams <dan.j.williams@...el.com>, Heiko Carstens <heiko.carstens@...ibm.com>, Martin Schwidefsky <schwidefsky@...ibm.com>, Tobias Regnery <tobias.regnery@...il.com>, Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com> Subject: Re: [PATCH -v4 0/14] mm: make movable onlining suck less On Fri 09-06-17 17:51:24, Wei Yang wrote: > Hi, Michal > > I am not that familiar with hotplug and trying to catch up the issue > and your solution. > > One potential issue I found is we don't check the physical boundary > when add_memory_resource(). > > For example, on x86-64, only 64T physical memory is supported currently. > Looks it is expanded after 5-level pagetable is introduced. While there is > still some limitations on this. But we don't check the boundary I think. > > During the bootup, this is ensured by the max_pfn which is guaranteed to > be under MAX_ARCH_PFN. I don't see some limitation on this when doing > hotplug. This might be true and I would have to double check but this rework doesn't change anything in that regards. Or do I miss something? -- Michal Hocko SUSE Labs
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