linux-kernel - Re: [PATCH -v4 0/14] mm: make movable onlining suck less

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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