Re: [PATCH v3 6/7] mm: truncate: split huge page cache page to a non-zero order if possible.

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To: Zi Yan <ziy@xxxxxxxxxx>
Subject: Re: [PATCH v3 6/7] mm: truncate: split huge page cache page to a non-zero order if possible.
From: Hugh Dickins <hughd@xxxxxxxxxx>
Date: Sun, 16 Apr 2023 12:51:46 -0700 (PDT)
Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>, Yang Shi <shy828301@xxxxxxxxx>, Yu Zhao <yuzhao@xxxxxxxxxx>, linux-mm@xxxxxxxxx, "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>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, cgroups@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx
In-reply-to: <9dd96da-efa2-5123-20d4-4992136ef3ad@google.com>
References: <20230403201839.4097845-1-zi.yan@sent.com> <20230403201839.4097845-7-zi.yan@sent.com> <9dd96da-efa2-5123-20d4-4992136ef3ad@google.com>

> As this code stands, truncate a 2M huge page at 1M and you get two 1M
> pieces (one then discarded) - nice; but truncate it at 1M+1 and you get
> lots of order 2 (forced up from 1) pieces.  Seems weird, and not worth
> the effort.

I've probably said that wrong: truncate at 1M+1 and you'd get lots of
order 0 pieces.

Hugh

References:
- [PATCH v3 0/7] Split a folio to any lower order folios
  - From: Zi Yan
- [PATCH v3 6/7] mm: truncate: split huge page cache page to a non-zero order if possible.
  - From: Zi Yan
- Re: [PATCH v3 6/7] mm: truncate: split huge page cache page to a non-zero order if possible.
  - From: Hugh Dickins

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