linux-kernel - Re: [RFC PATCH v1 0/4] Control folio sizes used for page cache memory

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Message-ID: <CAGsJ_4xhL89OSrqZitmdVPFDBbdU+AP-UeeHNoef3uRhnL8RLA@mail.gmail.com>
Date: Thu, 18 Dec 2025 12:50:54 +0800
From: Barry Song <21cnbao@...il.com>
To: Andi Kleen <ak@...nel.org>
Cc: Ryan Roberts <ryan.roberts@....com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Hugh Dickins <hughd@...gle.com>, Jonathan Corbet <corbet@....net>, 
	"Matthew Wilcox (Oracle)" <willy@...radead.org>, David Hildenbrand <david@...hat.com>, Lance Yang <ioworker0@...il.com>, 
	Baolin Wang <baolin.wang@...ux.alibaba.com>, Gavin Shan <gshan@...hat.com>, 
	Pankaj Raghav <kernel@...kajraghav.com>, Daniel Gomez <da.gomez@...sung.com>, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC PATCH v1 0/4] Control folio sizes used for page cache memory

On Thu, Dec 18, 2025 at 3:21 AM Andi Kleen <ak@...nel.org> wrote:
>
> Ryan Roberts <ryan.roberts@....com> writes:
>
> > Hi All,
> >
> > This series is an RFC that adds sysfs and kernel cmdline controls to configure
> > the set of allowed large folio sizes that can be used when allocating
> > file-memory for the page cache. As part of the control mechanism, it provides
> > for a special-case "preferred folio size for executable mappings" marker.
> >
> > I'm trying to solve 2 separate problems with this series:
> >
>
> What happened to this patchkit? I was looking into how to efficiently
> get larger pages for text transparently, and there doesn't seem
> to be anything better than such a heuristic?

I do feel that we need some controls over file folio sizes.

It could also be implemented using an eBPF-based approach, such as [1]?

[1] https://lore.kernel.org/linux-mm/20251026100159.6103-1-laoar.shao@gmail.com/

Thanks
Barry