linux-kernel - Re: [PATCH v1] mm: consider non-anonymous thp as unmovable page

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Message-ID: <20180405150547.GN6312@dhcp22.suse.cz>
Date:   Thu, 5 Apr 2018 17:05:47 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] mm: consider non-anonymous thp as unmovable page

On Thu 05-04-18 16:40:45, Kirill A. Shutemov wrote:
> On Thu, Apr 05, 2018 at 02:48:30PM +0200, Michal Hocko wrote:
[...]
> > RIght, I confused the two. What is the proper layer to fix that then?
> > rmap_walk_file?
> 
> Maybe something like this? Totally untested.

This looks way too complex. Why cannot we simply split THP page cache
during migration?
-- 
Michal Hocko
SUSE Labs