linux-kernel - Re: [PATCH 1/6] prctl: introduce PR_THP_POLICY_DEFAULT

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Message-ID: <fdc3bd2c-8321-402f-8ac1-ad0098c73318@lucifer.local>
Date: Thu, 15 May 2025 16:18:40 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: Usama Arif <usamaarif642@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        hannes@...xchg.org, shakeel.butt@...ux.dev, riel@...riel.com,
        ziy@...dia.com, laoar.shao@...il.com, baolin.wang@...ux.alibaba.com,
        Liam.Howlett@...cle.com, npache@...hat.com, ryan.roberts@....com,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        kernel-team@...a.com
Subject: Re: [PATCH 1/6] prctl: introduce PR_THP_POLICY_DEFAULT_HUGE for the
 process

On Thu, May 15, 2025 at 04:58:48PM +0200, David Hildenbrand wrote:
> On 15.05.25 16:56, Usama Arif wrote:
> >
> >
> > On 15/05/2025 15:44, David Hildenbrand wrote:
> > > On 15.05.25 16:40, Lorenzo Stoakes wrote:
> > > > Overall I feel this series should _DEFINITELY_ be an RFC. This is pretty
> > > > outlandish stuff and needs discussion.
> > > >
> > > > You're basically making it so /sys/kernel/mm/transparent_hugepage/enabled =
> > > > never is completely ignored and overridden.
> > >
> > > I thought I made it very clear during earlier discussions that never means never.
> > >
> >
> > Yes never means never
>
> Good, likely worth stating that clearly that there are no overrides (I did
> not look into the series yet, I was only responding to Lorenzo's concerns)
> :)

Yes, never is enforced after all (phew).

But we are setting VM_HUGEPAGE anyway... but at any rate, discussion is
ongoing of course...

>
> --
> Cheers,
>
> David / dhildenb
>