linux-kernel - Re: [PATCH v2 3/6] mm/memory_hotplug: Process all zones when removing memory

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Message-ID: <17de8d65-592f-72be-0891-6eaaedfd26f2@redhat.com>
Date:   Fri, 30 Aug 2019 09:07:59 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <osalvador@...e.de>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Wei Yang <richardw.yang@...ux.intel.com>
Subject: Re: [PATCH v2 3/6] mm/memory_hotplug: Process all zones when removing
 memory

On 30.08.19 08:47, Michal Hocko wrote:
> On Fri 30-08-19 08:20:32, David Hildenbrand wrote:
> [...]
>> Regarding shrink_zone_span(), I suspect it was introduced by
>>
>> d0dc12e86b31 ("mm/memory_hotplug: optimize memory hotplug")
> 
> zone shrinking code is much older - 815121d2b5cd5. But I do not think
> this is really needed for Fixes tag.
> 

Yes it's older, but since d0dc12e86b31 we could run into uninitialized
nids for added memory when trying to shrink the zone.

-- 

Thanks,

David / dhildenb