linux-kernel - Re: [PATCH v5 14/19] mm, swap: cleanup swap entry management workflow

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Message-ID: <CAMgjq7AUz10uETVm8ozDWcB3XohkOqf0i33KGrAquvEVvfp5cg@mail.gmail.com>
Date: Thu, 15 Jan 2026 00:53:41 +0800
From: Kairui Song <ryncsn@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Cc: Baoquan He <bhe@...hat.com>, Barry Song <baohua@...nel.org>, Chris Li <chrisl@...nel.org>, 
	Nhat Pham <nphamcs@...il.com>, Yosry Ahmed <yosry.ahmed@...ux.dev>, 
	David Hildenbrand <david@...nel.org>, Johannes Weiner <hannes@...xchg.org>, 
	Youngjun Park <youngjun.park@....com>, Hugh Dickins <hughd@...gle.com>, 
	Baolin Wang <baolin.wang@...ux.alibaba.com>, Ying Huang <ying.huang@...ux.alibaba.com>, 
	Kemeng Shi <shikemeng@...weicloud.com>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	"Matthew Wilcox (Oracle)" <willy@...radead.org>, linux-kernel@...r.kernel.org, 
	linux-pm@...r.kernel.org, "Rafael J. Wysocki (Intel)" <rafael@...nel.org>
Subject: Re: [PATCH v5 14/19] mm, swap: cleanup swap entry management workflow

On Sat, Dec 20, 2025 at 3:45 AM Kairui Song <ryncsn@...il.com> wrote:
>
> From: Kairui Song <kasong@...cent.com>
>
> The current swap entry allocation/freeing workflow has never had a clear
> definition. This makes it hard to debug or add new optimizations.
>
> This commit introduces a proper definition of how swap entries would be
> allocated and freed. Now, most operations are folio based, so they will
> never exceed one swap cluster, and we now have a cleaner border between
> swap and the rest of mm, making it much easier to follow and debug,
> especially with new added sanity checks. Also making more optimization
> possible.

...

>
> Cc: linux-pm@...r.kernel.org
> Acked-by: Rafael J. Wysocki (Intel) <rafael@...nel.org>
> Signed-off-by: Kairui Song <kasong@...cent.com>
> ---

Hi Andrew,

Is it convenient for you to squash this attached fix into this patch?
That's the two issues from Chris Mason and Lai Yi combined in a clean
to apply format, only 3 lines change.

There might be minor conflict by removing the WARN_ON in two following
patches, but should be easy to resolve. I can send a v6 if that's
troublesome.

Download attachment "0001-mm-swap-fix-locking-and-leaking-with-hibernation-sna.patch" of type "application/x-patch" (1474 bytes)