From: Andrew Morton <akpm@linux-foundation.org>
To: SeongJae Park <sj@kernel.org>
Cc: Usama Arif <usama.arif@linux.dev>,
npache@redhat.com, david@kernel.org, ziy@nvidia.com,
willy@infradead.org, linux-mm@kvack.org, matthew.brost@intel.com,
joshua.hahnjy@gmail.com, hannes@cmpxchg.org, rakie.kim@sk.com,
byungchul@sk.com, gourry@gourry.net,
ying.huang@linux.alibaba.com, apopple@nvidia.com,
linux-kernel@vger.kernel.org, kernel-team@meta.com,
richard.weiyang@gmail.com
Subject: Re: [PATCH v3] mm: migrate: requeue destination folio on deferred split queue
Date: Thu, 12 Mar 2026 17:52:41 -0700 [thread overview]
Message-ID: <20260312175241.01b876f3b325264f43312d79@linux-foundation.org> (raw)
In-Reply-To: <20260313001630.80081-1-sj@kernel.org>
On Thu, 12 Mar 2026 17:16:30 -0700 SeongJae Park <sj@kernel.org> wrote:
> > By the time migrate_folio_move() runs, partially mapped folios without a
> > pin have already been split by migrate_pages_batch(). So only two cases
> > remain on the deferred list at this point:
> > 1. Partially mapped folios with a pin (split failed).
> > 2. Fully mapped but potentially underused folios.
> > The recorded partially_mapped state is forwarded to deferred_split_folio()
> > so that the destination folio is correctly re-queued in both cases.
> >
> > Reported-by: Johannes Weiner <hannes@cmpxchg.org>
> > Fixes: dafff3f4c850 ("mm: split underused THPs")
>
> Seems the commit is merged in 6.12. And I assume the user impact on
> THP-shrinker enabled systems is visible. If so, should we Cc stable@ ?
I think the user impact should be visible to backport, but the
changelog is elusive on details?
next prev parent reply other threads:[~2026-03-13 0:52 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-12 10:47 Usama Arif
2026-03-12 14:27 ` Johannes Weiner
2026-03-13 0:16 ` SeongJae Park
2026-03-13 0:52 ` Andrew Morton [this message]
2026-03-13 10:40 ` Usama Arif
2026-03-14 22:40 ` Andrew Morton
2026-03-15 0:05 ` SeongJae Park
2026-03-15 0:23 ` Andrew Morton
2026-03-20 11:41 ` David Hildenbrand (Arm)
2026-03-13 1:18 ` Wei Yang
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