linux-kernel - Re: [PATCH v2 0/2] mm: Memory offlining + page isolation cleanups

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Message-ID: <72f796fc-b2de-0bbc-b6d9-c5bf5fe62099@redhat.com>
Date:   Tue, 22 Oct 2019 10:38:53 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Dan Williams <dan.j.williams@...el.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Oscar Salvador <osalvador@...e.de>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Pavel Tatashin <pavel.tatashin@...rosoft.com>,
        Pingfan Liu <kernelfans@...il.com>, Qian Cai <cai@....pw>,
        Vlastimil Babka <vbabka@...e.cz>,
        Wei Yang <richard.weiyang@...il.com>
Subject: Re: [PATCH v2 0/2] mm: Memory offlining + page isolation cleanups

On 22.10.19 10:32, David Hildenbrand wrote:
> On 22.10.19 10:21, Michal Hocko wrote:
>> On Tue 22-10-19 10:15:07, David Hildenbrand wrote:
>>> On 22.10.19 10:08, Michal Hocko wrote:
>>>> On Tue 22-10-19 08:52:28, David Hildenbrand wrote:
>>>>> On 21.10.19 19:23, David Hildenbrand wrote:
>>>>>> Two cleanups that popped up while working on (and discussing) virtio-mem:
>>>>>>      https://lkml.org/lkml/2019/9/19/463
>>>>>>
>>>>>> Tested with DIMMs on x86.
>>>>>>
>>>>>> As discussed with michal in v1, I'll soon look into removing the use
>>>>>> of PG_reserved during memory onlining completely - most probably
>>>>>> disallowing to offline memory blocks with holes, cleaning up the
>>>>>> onlining+offlining code.
>>>>>
>>>>> BTW, I remember that ZONE_DEVICE pages are still required to be set
>>>>> PG_reserved. That has to be sorted out first.
>>>>
>>>> Do they?
>>>
>>> Yes, especially KVM code :/
>>
>> Details please?
>>

Oh, and I think you might be wondering "how can we have RAM without a 
memmap in the guest", see

https://lwn.net/Articles/778240/

-- 

Thanks,

David / dhildenb