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From: Aveline Noir <jm5905938@gmail.com>
To: SJ Park <sj@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Shubhang Kaushik <sh@gentwo.org>,
	damon@lists.linux.dev, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org, Fernand Sieber <sieberf@amazon.com>,
	Leonard Foerster <foersleo@amazon.de>,
	SeongJae Park <sjpark@amazon.de>,
	Shakeel Butt <shakeel.butt@linux.dev>,
	Shubhang Kaushik <shubhang@os.amperecomputing.com>,
	Christoph Lameter (Ampere) <cl@gentwo.org>
Subject: Re: [PATCH] mm/damon: align MMU notifier range when clearing PMD young bit
Date: Fri, 23 Oct 2026 13:01:31 +0800	[thread overview]
Message-ID: <179273169185.2.1655708299473876346.damon-pmd-kvm-reply-draft@gmail.com> (raw)
In-Reply-To: <20261023002018.102560-1-sj@kernel.org>

Hi SJ,

On Thu, 22 Oct 2026 17:20:17 -0700 SJ Park <sj@kernel.org> wrote:
> I Cc-ed them.  Please Cc all
> recipients who get_maitnainer.pl is recommending, from the next time.

Sorry for that. Maybe I will use b4 next time :)

> However, I think this patch explains its context very well, and therefore
> this link is not needed.

Sure , That make sense.

> Were you also able to confirm the expected wrong behavior (missing part
> of the sampled huge page and age secondary mapping), too?

Yes. A test with nested x86-64 KVM confirmed both effects. With
4 KiB EPT mappings, a midpoint PMD sample left the first 1 MiB young and
aged the next THP's first 1 MiB. With 2 MiB EPT mappings, both whole THPs
were aged. After the fix, only the sampled THP was aged in both cases.

Thanks,
Aveline Noir

  reply	other threads:[~2026-10-23 15:22 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-22 14:26 Aveline Noir
2026-10-23  0:20 ` SJ Park
2026-10-23  5:01   ` Aveline Noir [this message]
2026-10-24  1:25     ` SJ Park

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