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

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Message-ID: <yec4eqg73qejlnmtckwjiexelswcxf3l5ctoaphq6ugyp3tu3e@vmex647zbp52>
Date: Thu, 15 May 2025 14:09:56 -0400
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
        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,
        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

* David Hildenbrand <david@...hat.com> [250515 13:30]:
> > > 
> > 
> > Did we document all this? :)
> > 
> > It'd be good to be super explicit about these sorts of 'dependency chains'.
> > 
> 
> Documentation/admin-guide/mm/transhuge.rst has under "Global THP controls"
> quite some stuff about all that, yes.
> 
> The whole document needs an overhaul, to clarify on the whole terminology,
> make it consistent, and better explain how the pagecache behaves etc. On my
> todo list, but I'm afraid it will be a bit of work to get it right / please
> most people.

Yes, the whole thing is making me grumpy (more than my default state).
The more I think about it, the more I don't like the prctl approach
either...

I more than dislike flags2... I hate it.

but no prctl, no cgroups, no bpf.. what is left?  A new policy groups
thing?  No, not that either, please.

To state the obvious, none of this is transparent.

Regards,
Liam