linux-kernel - Re: [PATCH v2 1/1] mm: skip mlocked THPs that are underused early in deferred_split

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Message-ID: <73c8a52c-37c5-45f4-b76e-f15267412242@redhat.com>
Date: Mon, 8 Sep 2025 11:12:16 +0200
From: David Hildenbrand <david@...hat.com>
To: Lance Yang <lance.yang@...ux.dev>, akpm@...ux-foundation.org
Cc: Liam.Howlett@...cle.com, baohua@...nel.org,
 baolin.wang@...ux.alibaba.com, dev.jain@....com,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 lorenzo.stoakes@...cle.com, npache@...hat.com, ryan.roberts@....com,
 usamaarif642@...il.com, ziy@...dia.com
Subject: Re: [PATCH v2 1/1] mm: skip mlocked THPs that are underused early in
 deferred_split_scan()

On 08.09.25 11:07, Lance Yang wrote:
> From: Lance Yang <lance.yang@...ux.dev>
> 
> When we stumble over a fully-mapped mlocked THP in the deferred shrinker,
> it does not make sense to try to detect whether it is underused, because
> try_to_map_unused_to_zeropage(), called while splitting the folio, will not
> actually replace any zeroed pages by the shared zeropage.
> 
> Splitting the folio in that case does not make any sense, so let's not even
> scan to check if the folio is underused.
> 
> Suggested-by: David Hildenbrand <david@...hat.com>

Feel free to drop that, I only tweaked you description :)

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Cheers

David / dhildenb