Re: [PATCH v4 5/7] mm: thp: split huge page to any lower order pages (except order-1).

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To: Zi Yan <ziy@xxxxxxxxxx>
Subject: Re: [PATCH v4 5/7] mm: thp: split huge page to any lower order pages (except order-1).
From: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Date: Tue, 13 Feb 2024 14:05:39 -0800
Cc: "Pankaj Raghav (Samsung)" <kernel@xxxxxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, Yang Shi <shy828301@xxxxxxxxx>, Yu Zhao <yuzhao@xxxxxxxxxx>, "Kirill A . Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Ryan Roberts <ryan.roberts@xxxxxxx>, Michal Koutný <mkoutny@xxxxxxxx>, Roman Gushchin <roman.gushchin@xxxxxxxxx>, "Zach O'Keefe" <zokeefe@xxxxxxxxxx>, Hugh Dickins <hughd@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, cgroups@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx
In-reply-to: <20240213215520.1048625-6-zi.yan@sent.com>
References: <20240213215520.1048625-1-zi.yan@sent.com> <20240213215520.1048625-6-zi.yan@sent.com>

On Tue, Feb 13, 2024 at 04:55:18PM -0500, Zi Yan wrote:
> From: Zi Yan <ziy@xxxxxxxxxx>
> Order-1 folio is not supported because _deferred_list, which is used by
> partially mapped folios, is stored in subpage 2 and an order-1 folio only
> has subpage 0 and 1.

The LBS patches has the patch from Matthew which enables and allowed us
to successfully test order 1. So this restriction could be dropped if
that gets merged.

  Luis

Follow-Ups:
- Re: [PATCH v4 5/7] mm: thp: split huge page to any lower order pages (except order-1).
  - From: Zi Yan
- Re: [PATCH v4 5/7] mm: thp: split huge page to any lower order pages (except order-1).
  - From: David Hildenbrand

References:
- [PATCH v4 0/7] Split a folio to any lower order folios
  - From: Zi Yan
- [PATCH v4 5/7] mm: thp: split huge page to any lower order pages (except order-1).
  - From: Zi Yan

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