Re: [PATCH] mm/madvise: keep the hardware dirty bit in MADV_COLD's THP path

[Lorenzo Stoakes (ARM)]

+cc Pedro

On Mon, Oct 12, 2026 at 11:17:57AM -0400, Zi Yan wrote:
> On 12 Oct 2026, at 6:38, Lorenzo Stoakes (ARM) wrote:

> > [0]: https://lore.kernel.org/linux-mm/20261009-lazyfree-stable-fix-v1-1-70997958ef8d@xxxxxxxxxx
>
> No. Without lazyfree PMD level THP discard, the affect PMD will be split
> into PTEs without dirty bit and the dirty folio is still discarded.

OK thanks for clarifying!

>
> We will need Samarth’s fix for backport, then we can think carefully
> about David’s per-arch solution for mainline.

It's AI slop, and we don't accept that in mm (also -cc slopper).

Somebody from the core team will take of this fix separately.

Pedro - you mentioned you were interested in this, will you send a patch?

--
Cheers, Lorenzo