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

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To: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Subject: Re: [PATCH v1] mm: consider non-anonymous thp as unmovable page
From: Michal Hocko <mhocko@xxxxxxxxxx>
Date: Thu, 5 Apr 2018 17:05:47 +0200
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>
In-reply-to: <20180405134045.7axuun6d7ufobzj4@node.shutemov.name>
References: <1522730788-24530-1-git-send-email-n-horiguchi@ah.jp.nec.com> <20180403075928.GC5501@dhcp22.suse.cz> <20180403082405.GA23809@hori1.linux.bs1.fc.nec.co.jp> <20180403083451.GG5501@dhcp22.suse.cz> <20180403105411.hknofkbn6rzs26oz@node.shutemov.name> <20180405085927.GC6312@dhcp22.suse.cz> <20180405122838.6a6b35psizem4tcy@node.shutemov.name> <20180405124830.GJ6312@dhcp22.suse.cz> <20180405134045.7axuun6d7ufobzj4@node.shutemov.name>
User-agent: Mutt/1.9.4 (2018-02-28)

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

Follow-Ups:
- Re: [PATCH v1] mm: consider non-anonymous thp as unmovable page
  - From: Kirill A. Shutemov

References:
- [PATCH v1] mm: consider non-anonymous thp as unmovable page
  - From: Naoya Horiguchi
- Re: [PATCH v1] mm: consider non-anonymous thp as unmovable page
  - From: Michal Hocko
- Re: [PATCH v1] mm: consider non-anonymous thp as unmovable page
  - From: Naoya Horiguchi
- Re: [PATCH v1] mm: consider non-anonymous thp as unmovable page
  - From: Michal Hocko
- Re: [PATCH v1] mm: consider non-anonymous thp as unmovable page
  - From: Kirill A. Shutemov
- Re: [PATCH v1] mm: consider non-anonymous thp as unmovable page
  - From: Michal Hocko
- Re: [PATCH v1] mm: consider non-anonymous thp as unmovable page
  - From: Kirill A. Shutemov
- Re: [PATCH v1] mm: consider non-anonymous thp as unmovable page
  - From: Michal Hocko
- Re: [PATCH v1] mm: consider non-anonymous thp as unmovable page
  - From: Kirill A. Shutemov

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