linux-kernel - Re: [PATCH v3 3/3] mm,page_owner: Fix accounting of pages when migrating

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Date: Tue, 2 Apr 2024 14:39:29 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Oscar Salvador <osalvador@...e.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, Michal Hocko <mhocko@...e.com>,
 Marco Elver <elver@...gle.com>, Andrey Konovalov <andreyknvl@...il.com>,
 Alexander Potapenko <glider@...gle.com>
Subject: Re: [PATCH v3 3/3] mm,page_owner: Fix accounting of pages when
 migrating

On 4/2/24 1:22 PM, Oscar Salvador wrote:
> On Tue, Apr 02, 2024 at 12:26:51PM +0200, Vlastimil Babka wrote:
>> Can the migration still fail after __folio_copy_owner()? That goes again to
>> the comment you changed in patch 1/3. If it can, this will kinda create a
>> mess with the old folio's handles not reflecting reality? (although
>> refcounts will be ok)
> 
> According to my research (I replied in patch#1), no, migration cannot
> fail after __folio_copy_owner(), so we are safe here (Tm).

OK then,

Reviewed-by: Vlastimil Babka <vbabka@...e.cz>