From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Joanne Koong <joannelkoong@gmail.com>,
akpm@linux-foundation.org, ljs@kernel.org
Cc: usama.arif@linux.dev, alex@ghiti.fr, ziy@nvidia.com,
baolin.wang@linux.alibaba.com, liam@infradead.org,
npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com,
baohua@kernel.org, lance.yang@linux.dev, vbabka@kernel.org,
rppt@kernel.org, surenb@google.com, mhocko@suse.com,
willy@infradead.org, linux-mm@kvack.org
Subject: Re: [PATCH v1 0/2] mm: split underused anonymous mTHP folios
Date: Wed, 8 Jul 2026 09:46:52 +0200 [thread overview]
Message-ID: <ad31d36d-ac84-4053-a5d9-e18c346f3908@kernel.org> (raw)
In-Reply-To: <20260707201735.4113107-1-joannelkoong@gmail.com>
On 7/7/26 22:17, Joanne Koong wrote:
> PMD-sized THPs that are mostly zero-filled are reclaimed under memory pressure
> by the deferred split shrinker, but this is not done for mTHP folios. At Meta,
> we would like to deploy 2M THP=always on ARM (with 64k base pages), as 2M
> provides contpte benefits and 512M is too big. However, 2M THP=always will
> result in a memory regression unless the extra unused portions of THPs can be
> broken down and reclaimed.
>
> This series has two patches:
> Patch 1 - makes thp_underused() work for non-PMD-sized folios by scaling
> khugepaged_max_ptes_none proportionally to the folio size and using that
> as the threshold for how many zero-filled pages a folio can contain before
> it's considered underused.
Did you look at the khugepaged side, and how we handle it there?
--
Cheers,
David
next prev parent reply other threads:[~2026-07-08 7:47 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-07 20:17 [PATCH v1 0/2] mm: split underused anonymous mTHP folios Joanne Koong
2026-07-07 20:17 ` [PATCH v1 1/2] mm/huge_memory: extend thp_underused() to " Joanne Koong
2026-07-08 4:03 ` Joanne Koong
2026-07-07 20:17 ` [PATCH v1 2/2] mm/memory: add anonymous mTHP folios to deferred split list Joanne Koong
2026-07-08 7:56 ` David Hildenbrand (Arm)
2026-07-08 9:58 ` Usama Arif
2026-07-08 17:52 ` Joanne Koong
2026-07-08 7:46 ` David Hildenbrand (Arm) [this message]
2026-07-08 18:19 ` [PATCH v1 0/2] mm: split underused anonymous mTHP folios Joanne Koong
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