linux-kernel - Re: [RFC PATCH] page_alloc: allow migration of smaller hugepages during contig

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Message-ID: <aPabPH_6FxPgPKM5@gourry-fedora-PF4VCD3F>
Date: Mon, 20 Oct 2025 16:27:40 -0400
From: Gregory Price <gourry@...rry.net>
To: David Hildenbrand <david@...hat.com>
Cc: Zi Yan <ziy@...dia.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kernel-team@...a.com,
	akpm@...ux-foundation.org, vbabka@...e.cz, surenb@...gle.com,
	mhocko@...e.com, jackmanb@...gle.com, hannes@...xchg.org
Subject: Re: [RFC PATCH] page_alloc: allow migration of smaller hugepages
 during contig_alloc.

On Mon, Oct 20, 2025 at 10:17:42PM +0200, David Hildenbrand wrote:
> Yes, it's completely racy.
> 
> I was primarily concerned about us calling functions that will VM_WARN_ON()
> etc due to the races; not that they would make us accept/jump over a range
> although we shouldn't.
> 
> Of course, regarding the latter, we want to try as good as possible to avoid
> jumping over ranges that we can actually handle.
>

I'll go ahead and add a snapshot_page.

~Gregory