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

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Message-ID: <25d3f071-3268-298b-e0c8-9c307d1015fe@redhat.com>
Date:   Tue, 22 Oct 2019 08:52:28 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     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>,
        Michal Hocko <mhocko@...e.com>,
        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 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. I remember that somebody 
was working on it a while ago but didn't hear about that again. Will 
look into that as well - should be as easy as adding a zone check (if 
there isn't a pfn_to_online_page() check already). But of course, there 
might be special cases ....


-- 

Thanks,

David / dhildenb