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

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Message-ID: <ZgvqWoZsYJLenSE_@localhost.localdomain>
Date: Tue, 2 Apr 2024 13:22:02 +0200
From: Oscar Salvador <osalvador@...e.de>
To: Vlastimil Babka <vbabka@...e.cz>
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 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).


-- 
Oscar Salvador
SUSE Labs