From: Usama Arif <usama.arif@linux.dev>
To: Andrew Morton <akpm@linux-foundation.org>,
david@kernel.org, chrisl@kernel.org, kasong@tencent.com,
ljs@kernel.org, ziy@nvidia.com, linux-mm@kvack.org
Cc: ying.huang@linux.alibaba.com, Baoquan He <baoquan.he@linux.dev>,
willy@infradead.org, youngjun.park@lge.com, hannes@cmpxchg.org,
riel@surriel.com, shakeel.butt@linux.dev, alex@ghiti.fr,
kas@kernel.org, baohua@kernel.org, dev.jain@arm.com,
baolin.wang@linux.alibaba.com, Nico Pache <nico.pache@linux.dev>,
"Liam R. Howlett" <liam@infradead.org>,
ryan.roberts@arm.com, Vlastimil Babka <vbabka@kernel.org>,
lance.yang@linux.dev, linux-kernel@vger.kernel.org,
nphamcs@gmail.com, shikemeng@huaweicloud.com, yosry@kernel.org,
kernel-team@meta.com
Subject: Re: [PATCH v6 00/12] mm: PMD-level swap entries for anonymous THPs
Date: Wed, 19 Aug 2026 14:04:41 +0100 [thread overview]
Message-ID: <282ef982-3e48-4283-9155-73a33fc1c4e8@linux.dev> (raw)
In-Reply-To: <20260818131202.494754-1-usama.arif@linux.dev>
On 18/08/2026 14:09, Usama Arif wrote:
> When reclaim swaps out a PMD-mapped anonymous THP today, the PMD is
> split into HPAGE_PMD_NR PTE-level swap entries via TTU_SPLIT_HUGE_PMD
> before unmap. This series introduces a PMD-level swap entry so the
> huge mapping can survive the swap round-trip and do_huge_pmd_swap_page()
> can restore the PMD mapping directly on swap-in, without waiting for
> khugepaged to collapse the range later.
>
Addressing sashiko feedback from [1] here as its a common reply for most of it.
The PMD swap entry is installed in patch 11, until that time, the path in patches
1-10 is not taken, so the feedback from sashiko is mostly wrong as the feedback
in patches 1-10 is that PMD swap entry is not handled in another path, but it
is in a later patch from where the feedback is being given.
If patches 1-10 were squashed into a single patch, I imagine sashiko will be
happy :)
[1] https://sashiko.dev/#/patchset/20260818131202.494754-1-usama.arif%40linux.dev
prev parent reply other threads:[~2026-08-19 13:04 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-18 13:09 [PATCH v6 00/12] mm: PMD-level swap entries for anonymous THPs Usama Arif
2026-08-18 13:09 ` [PATCH v6 01/12] mm: rename pmd_to_softleaf_folio() to pmd_softleaf_to_folio() Usama Arif
2026-08-18 14:24 ` David Hildenbrand (Arm)
2026-08-18 18:36 ` Lorenzo Stoakes (ARM)
2026-08-18 18:38 ` Zi Yan
2026-08-19 14:32 ` Kiryl Shutsemau
2026-08-18 13:09 ` [PATCH v6 02/12] mm: add PMD swap entry detection support Usama Arif
2026-08-18 14:40 ` David Hildenbrand (Arm)
2026-08-18 18:42 ` Lorenzo Stoakes (ARM)
2026-08-19 12:33 ` Usama Arif
2026-08-19 16:05 ` David Hildenbrand (Arm)
2026-08-19 12:31 ` Usama Arif
2026-08-19 14:42 ` Kiryl Shutsemau
2026-08-19 16:00 ` David Hildenbrand (Arm)
2026-08-18 13:09 ` [PATCH v6 03/12] mm: add PMD swap entry splitting support Usama Arif
2026-08-18 17:53 ` David Hildenbrand (Arm)
2026-08-19 12:39 ` Usama Arif
2026-08-19 16:05 ` David Hildenbrand (Arm)
2026-08-19 15:16 ` Kiryl Shutsemau
2026-08-19 16:04 ` David Hildenbrand (Arm)
2026-08-19 15:13 ` Kiryl Shutsemau
2026-08-18 13:09 ` [PATCH v6 04/12] mm: handle PMD swap entries in fork path Usama Arif
2026-08-19 15:46 ` Kiryl Shutsemau
2026-08-18 13:09 ` [PATCH v6 05/12] mm: zswap: add range lookup for large-folio swapin Usama Arif
2026-08-18 18:28 ` Yosry Ahmed
2026-08-19 12:50 ` Usama Arif
2026-08-18 13:09 ` [PATCH v6 06/12] mm: swap in PMD swap entries as whole THPs during swapoff Usama Arif
2026-08-19 5:38 ` Lance Yang
2026-08-19 12:52 ` Usama Arif
2026-08-18 13:09 ` [PATCH v6 07/12] mm: handle PMD swap entries in non-present PMD walkers Usama Arif
2026-08-18 13:09 ` [PATCH v6 08/12] mm: handle PMD swap entries in MADV_WILLNEED Usama Arif
2026-08-18 13:09 ` [PATCH v6 09/12] mm: handle PMD swap entries in UFFDIO_MOVE Usama Arif
2026-08-18 13:09 ` [PATCH v6 10/12] mm: handle PMD swap entry faults on swap-in Usama Arif
2026-08-18 13:09 ` [PATCH v6 11/12] mm: install PMD swap entries on swap-out Usama Arif
2026-08-18 13:09 ` [PATCH v6 12/12] selftests/mm: add PMD swap entry tests Usama Arif
2026-08-19 10:10 ` Lance Yang
2026-08-19 12:56 ` Usama Arif
2026-08-19 13:04 ` Usama Arif [this message]
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