linux-kernel - Re: [PATCH v8 mm-new 05/12] mm: thp: decouple THP allocation between swap and page fault paths

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Message-ID: <37ec3e8b-e46d-40d4-826d-b4b2378015cb@gmail.com>
Date: Fri, 26 Sep 2025 16:19:41 +0100
From: Usama Arif <usamaarif642@...il.com>
To: Yafang Shao <laoar.shao@...il.com>, akpm@...ux-foundation.org,
 david@...hat.com, ziy@...dia.com, baolin.wang@...ux.alibaba.com,
 lorenzo.stoakes@...cle.com, Liam.Howlett@...cle.com, npache@...hat.com,
 ryan.roberts@....com, dev.jain@....com, hannes@...xchg.org,
 gutierrez.asier@...wei-partners.com, willy@...radead.org, ast@...nel.org,
 daniel@...earbox.net, andrii@...nel.org, ameryhung@...il.com,
 rientjes@...gle.com, corbet@....net, 21cnbao@...il.com,
 shakeel.butt@...ux.dev, tj@...nel.org, lance.yang@...ux.dev
Cc: bpf@...r.kernel.org, linux-mm@...ck.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 mm-new 05/12] mm: thp: decouple THP allocation between
 swap and page fault paths



On 26/09/2025 10:33, Yafang Shao wrote:
> The new BPF capability enables finer-grained THP policy decisions by
> introducing separate handling for swap faults versus normal page faults.
> 
> As highlighted by Barry:
> 
>   We’ve observed that swapping in large folios can lead to more
>   swap thrashing for some workloads- e.g. kernel build. Consequently,
>   some workloads might prefer swapping in smaller folios than those
>   allocated by alloc_anon_folio().
> 
> While prtcl() could potentially be extended to leverage this new policy,
> doing so would require modifications to the uAPI.
> 
> Signed-off-by: Yafang Shao <laoar.shao@...il.com>
> Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> Cc: Barry Song <21cnbao@...il.com>
> ---
>  include/linux/huge_mm.h | 3 ++-
>  mm/huge_memory.c        | 2 +-
>  mm/memory.c             | 2 +-
>  3 files changed, 4 insertions(+), 3 deletions(-)
> 

Acked-by: Usama Arif <usamaarif642@...il.com>