From: Will Deacon <will@kernel.org>
To: Barry Song <21cnbao@gmail.com>
Cc: Weilin Tong <tongweilin@linux.alibaba.com>,
Catalin Marinas <catalin.marinas@arm.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@kernel.org>,
linux-mm@kvack.org, baolin.wang@linux.alibaba.com
Subject: Re: [RFC PATCH] arm64: Kconfig: enable ARCH_WANTS_THP_SWAP for all pagesizes
Date: Thu, 8 Jan 2026 18:29:19 +0000 [thread overview]
Message-ID: <aV_3fxlzwOSz8B0t@willie-the-truck> (raw)
In-Reply-To: <CAGsJ_4zd+SMa4Mj23tjF5OwsP3LQyvYTrwN4y81=k8FSFgbH3Q@mail.gmail.com>
On Fri, Dec 26, 2025 at 07:52:44PM +1300, Barry Song wrote:
> On Fri, Dec 26, 2025 at 7:39 PM Weilin Tong
> <tongweilin@linux.alibaba.com> wrote:
> >
> > Currently, ARCH_WANTS_THP_SWAP was limited to 4K page size ARM64 kernels, but
> > large folios requiring swapping also exist in other page size configurations
> > (e.g. 64K). Without this config, large folios in these kernels cannot be swapped
> > out.
> >
> > Here we enable ARCH_WANTS_THP_SWAP for all ARM64 page sizes.
>
> I no longer recall why this was not enabled for sizes other than
> 4 KB in commit d0637c505f8a ("arm64: enable THP_SWAP for arm64"), but
> it appears to be fine, and the swap cluster size should also be
> more friendly to PMD alignment.
You seemed to be worried about I/O latency in your original post:
https://lore.kernel.org/all/20220524071403.128644-1-21cnbao@gmail.com/
Will
next prev parent reply other threads:[~2026-01-08 18:29 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-26 6:38 Weilin Tong
2025-12-26 6:52 ` Barry Song
2025-12-26 8:18 ` Weilin Tong
2025-12-26 8:31 ` Barry Song
2025-12-26 8:40 ` Weilin Tong
2025-12-26 8:31 ` Weilin Tong
2026-01-08 18:29 ` Will Deacon [this message]
2026-01-08 23:11 ` Barry Song
2026-01-09 8:32 ` Weilin Tong
2026-01-09 9:59 ` Barry Song
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