linux-kernel - Re: [PATCH POC] prctl: extend PR_SET_THP_DISABLE to optionally exclude VM

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Message-ID: <4b11f40b-a339-4ffd-8b94-a62ef0524403@lucifer.local>
Date: Tue, 22 Jul 2025 11:27:55 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Usama Arif <usamaarif642@...il.com>
Cc: David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-doc@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>, Zi Yan <ziy@...dia.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Nico Pache <npache@...hat.com>, Ryan Roberts <ryan.roberts@....com>,
        Dev Jain <dev.jain@....com>, Barry Song <baohua@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
        SeongJae Park <sj@...nel.org>, Jann Horn <jannh@...gle.com>,
        Yafang Shao <laoar.shao@...il.com>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH POC] prctl: extend PR_SET_THP_DISABLE to optionally
 exclude VM_HUGEPAGE

On Tue, Jul 22, 2025 at 12:23:04PM +0200, David Hildenbrand wrote:
> On 21.07.25 19:27, Usama Arif wrote:
> >   tools/testing/selftests/prctl/Makefile      |   2 +-
> >   tools/testing/selftests/prctl/thp_disable.c | 207 ++++++++++++++++++++
>
> Like SJ says, this should better live under mm, then we can also make use of
> check_huge_anon() and vm_utils.c and probably also THP helpers from
> thp_settings.h. Most of the helpers you use should be available in some form
> there already.

*A wild Lorenzo appears*

I mean everyone's saying the same thing, but you'd almost be disappointed
if I didn't say here 'pleeeease keep as much of this in mm as possible'
also :P

Thanks for taking this on and writing the test Usama! :)

Cheers, Lorenzo