linux-kernel - Re: [PATCH v2 00/29] mm/migration: rework movable

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Message-Id: <20250704140623.d6b9a013984bc2a109dd4dc9@linux-foundation.org>
Date: Fri, 4 Jul 2025 14:06:23 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: David Hildenbrand <david@...hat.com>
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Subject: Re: [PATCH v2 00/29] mm/migration: rework movable_ops page
 migration (part 1)

On Fri,  4 Jul 2025 12:24:54 +0200 David Hildenbrand <david@...hat.com> wrote:

> In the future, as we decouple "struct page" from "struct folio", pages
> that support "non-lru page migration" -- movable_ops page migration
> such as memory balloons and zsmalloc -- will no longer be folios. They
> will not have ->mapping, ->lru, and likely no refcount and no
> page lock. But they will have a type and flags 🙂
> 
> This is the first part (other parts not written yet) of decoupling
> movable_ops page migration from folio migration.
> 
> In this series, we get rid of the ->mapping usage, and start cleaning up
> the code + separating it from folio migration.
> 
> Migration core will have to be further reworked to not treat movable_ops
> pages like folios. This is the first step into that direction.
> 
> Heavily tested with virtio-balloon and lightly tested with zsmalloc
> on x86-64. Cross-compile-tested.

Thanks, I added this to mm-new.  I suppressed the 1363 mm-commits
emails to avoid breaking the internet.