linux-kernel - Re: [PATCH 06/21] mm/page_alloc: add __GFP

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Message-ID: <20260128162913.GCaXo5Wch-bmKzIZuj@fat_crate.local>
Date: Wed, 28 Jan 2026 17:29:13 +0100
From: Borislav Petkov <bp@...en8.de>
To: Brendan Jackman <jackmanb@...gle.com>
Cc: Dave Hansen <dave.hansen@...el.com>, Andy Lutomirski <luto@...nel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Johannes Weiner <hannes@...xchg.org>, Zi Yan <ziy@...dia.com>,
	Axel Rasmussen <axelrasmussen@...gle.com>,
	Yuanchu Xie <yuanchu@...gle.com>,
	Roman Gushchin <roman.gushchin@...ux.dev>, peterz@...radead.org,
	dave.hansen@...ux.intel.com, mingo@...hat.com, tglx@...utronix.de,
	akpm@...ux-foundation.org, david@...hat.com, derkling@...gle.com,
	junaids@...gle.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, reijiw@...gle.com, rientjes@...gle.com,
	rppt@...nel.org, vbabka@...e.cz, x86@...nel.org,
	yosry.ahmed@...ux.dev
Subject: Re: [PATCH 06/21] mm/page_alloc: add __GFP_SENSITIVE and always set
 it

On Wed, Jan 28, 2026 at 03:57:07PM +0000, Brendan Jackman wrote:
>  Yeah, that time has long since passed, I'm sorry about the delay!

Nothing to be sorry for.

>  I'm working on it as we speak. The submission I've been trying to
>  post for the last few week is to add a __GFP_UNMAPPED flag. That will
>  unblock the guest_memfd unmapped usecase.
>  
>  I got some design elements wrong and had to reimplement some stuff
>  during January (I had an AI review my code and it pointed out that
>  part of my pagetable management code was garbage. Spooky).

Did it say "garbage"? If so, yeah, you're using the lkml review profile :-P

> Now I'm working on integrating the new version with the guest_memfd features
> to make sure it's actually fast (it's quite complicated so it had better be
> useful). Once that's done I'll hopefully be ready to post....
> 
>  _THEN_ I can update the __GFP_SENSITIVE functionality on top of the
>  __GFP_UNMAPPED functionality. The former means "don't map into ASI" and the
>  latter means "don't map at all" so they overlap in terms of allocator
>  stuff.l

Sounds good.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette