linux-kernel - Re: [PATCH v2] mm: fault in complete folios instead of individual pages for tmpfs

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Message-ID: <048c8d4d-5e5b-472f-850b-6392b8f4d2a5@lucifer.local>
Date: Thu, 17 Jul 2025 10:20:58 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>, ziy@...dia.com,
        Liam.Howlett@...cle.com, npache@...hat.com, ryan.roberts@....com,
        dev.jain@....com, baohua@...nel.org, vbabka@...e.cz, rppt@...nel.org,
        surenb@...gle.com, mhocko@...e.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm: fault in complete folios instead of individual
 pages for tmpfs

On Thu, Jul 17, 2025 at 10:22:47AM +0200, David Hildenbrand wrote:
> I recall [1]. But that would, of course, only affect the RSS of a program
> and not the actual memory consumption (the large folio resides in memory
> ...).
>
> The comments in the code spells that out: "inflating the RSS of the
> process."

RSS is a pretty sucky measure though, as covered in depth by Vlastimil in
his KR 2024 talk [2]. So maybe we don't need to worry _so_ much about this
:)

[2]:https://kernel-recipes.org/en/2024/schedule/all-your-memory-are-belong-to-whom/

>
> [1] https://www.suse.com/support/kb/doc/?id=000019017
>
> --
> Cheers,
>
> David / dhildenb
>

Cheers, Lorenzo