From: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
To: Dev Jain <dev.jain@arm.com>
Cc: Wei Yang <richard.weiyang@gmail.com>,
Barry Song <21cnbao@gmail.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
akpm@linux-foundation.org, david@kernel.org,
catalin.marinas@arm.com, will@kernel.org, ryan.roberts@arm.com,
Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org,
surenb@google.com, mhocko@suse.com, riel@surriel.com,
harry.yoo@oracle.com, jannh@google.com, willy@infradead.org,
linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 5/5] mm: rmap: support batched unmapping for file large folios
Date: Fri, 16 Jan 2026 11:14:20 +0000 [thread overview]
Message-ID: <82580f1b-2e15-4c91-a563-0b76ad9f068d@lucifer.local> (raw)
In-Reply-To: <db4d0a19-598b-48ff-accc-f5940a481035@arm.com>
On Fri, Jan 16, 2026 at 03:23:02PM +0530, Dev Jain wrote:
> I am of the opinion that we should do something like this. In the internal pvmw code,
> we keep skipping ptes till the ptes are none. With my proposed uffd-fix [1], if the old
> ptes were uffd-wp armed, pte_install_uffd_wp_if_needed will convert all ptes from none
> to not none, and we will lose the batching effect. I also plan to extend support to
> anonymous folios (therefore generalizing for all types of memory) which will set a
> batch of ptes as swap, and the internal pvmw code won't be able to skip through the
> batch.
>
>
> [1] https://lore.kernel.org/linux-mm/20260116082721.275178-1-dev.jain@arm.com/
No, as I told you, the correct course is to make your suggestion here with
perhaps a suggested fix-patch, please let's not split the discussion
between _the actual series where the issue exists_ and an invalid patch
report, it makes it _super hard_ to track what on earth is going on here.
Now anybody responding will be inclined to reply there and it's a total
mess...
Thanks, Lorenzo
next prev parent reply other threads:[~2026-01-16 11:14 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-26 6:07 [PATCH v5 0/5] support batch checking of references and unmapping for " Baolin Wang
2025-12-26 6:07 ` [PATCH v5 1/5] mm: rmap: support batched checks of the references " Baolin Wang
2026-01-07 6:01 ` Harry Yoo
2026-02-09 8:49 ` David Hildenbrand (Arm)
2026-02-09 9:14 ` Baolin Wang
2026-02-09 9:20 ` David Hildenbrand (Arm)
2026-02-09 9:25 ` Baolin Wang
2025-12-26 6:07 ` [PATCH v5 2/5] arm64: mm: factor out the address and ptep alignment into a new helper Baolin Wang
2026-02-09 8:50 ` David Hildenbrand (Arm)
2025-12-26 6:07 ` [PATCH v5 3/5] arm64: mm: support batch clearing of the young flag for large folios Baolin Wang
2026-01-02 12:21 ` Ryan Roberts
2026-02-09 9:02 ` David Hildenbrand (Arm)
2025-12-26 6:07 ` [PATCH v5 4/5] arm64: mm: implement the architecture-specific clear_flush_young_ptes() Baolin Wang
2026-01-28 11:47 ` Chris Mason
2026-01-29 1:42 ` Baolin Wang
2026-02-09 9:09 ` David Hildenbrand (Arm)
2026-02-09 9:36 ` Baolin Wang
2026-02-09 9:55 ` David Hildenbrand (Arm)
2026-02-09 10:13 ` Baolin Wang
2026-02-16 0:24 ` Alistair Popple
2025-12-26 6:07 ` [PATCH v5 5/5] mm: rmap: support batched unmapping for file large folios Baolin Wang
2026-01-06 13:22 ` Wei Yang
2026-01-06 21:29 ` Barry Song
2026-01-07 1:46 ` Wei Yang
2026-01-07 2:21 ` Barry Song
2026-01-07 2:29 ` Baolin Wang
2026-01-07 3:31 ` Wei Yang
2026-01-16 9:53 ` Dev Jain
2026-01-16 11:14 ` Lorenzo Stoakes [this message]
2026-01-16 14:28 ` Barry Song
2026-01-16 15:23 ` Barry Song
2026-01-16 15:49 ` Baolin Wang
2026-01-18 5:46 ` Dev Jain
2026-01-19 5:50 ` Baolin Wang
2026-01-19 6:36 ` Dev Jain
2026-01-19 7:22 ` Baolin Wang
2026-01-16 15:14 ` Barry Song
2026-01-18 5:48 ` Dev Jain
2026-01-07 6:54 ` Harry Yoo
2026-01-16 8:42 ` Lorenzo Stoakes
2026-01-16 16:26 ` [PATCH] mm: rmap: skip batched unmapping for UFFD vmas Baolin Wang
2026-02-09 9:54 ` David Hildenbrand (Arm)
2026-02-09 10:49 ` Barry Song
2026-02-09 10:58 ` David Hildenbrand (Arm)
2026-02-10 12:01 ` Dev Jain
2026-02-09 9:38 ` [PATCH v5 5/5] mm: rmap: support batched unmapping for file large folios David Hildenbrand (Arm)
2026-02-09 9:43 ` Baolin Wang
2026-02-13 5:19 ` Barry Song
2026-02-18 12:26 ` Dev Jain
2026-01-16 8:41 ` [PATCH v5 0/5] support batch checking of references and unmapping for " Lorenzo Stoakes
2026-01-16 10:53 ` David Hildenbrand (Red Hat)
2026-01-16 10:52 ` David Hildenbrand (Red Hat)
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