From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Dev Jain <dev.jain@arm.com>,
akpm@linux-foundation.org, ljs@kernel.org, chrisl@kernel.org,
kasong@tencent.com, hughd@google.com, liam@infradead.org
Cc: riel@surriel.com, vbabka@kernel.org, harry@kernel.org,
jannh@google.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, rppt@kernel.org, surenb@google.com,
mhocko@suse.com, qi.zheng@linux.dev, shakeel.butt@linux.dev,
baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com,
weixugc@google.com, shikemeng@huaweicloud.com, nphamcs@gmail.com,
bhe@redhat.com, youngjun.park@lge.com,
baolin.wang@linux.alibaba.com, pfalcato@suse.de,
ryan.roberts@arm.com, anshuman.khandual@arm.com
Subject: Re: [PATCH v4 04/12] mm/memory: Batch set uffd-wp markers during zapping
Date: Tue, 7 Jul 2026 15:47:57 +0200 [thread overview]
Message-ID: <c03d123f-2cb3-42d6-8127-9aed5b5333ae@kernel.org> (raw)
In-Reply-To: <0654116a-235d-4eb0-9970-414322645aa3@arm.com>
On 6/27/26 11:00, Dev Jain wrote:
>
>
> On 23/06/26 3:31 pm, Dev Jain wrote:
>>
>>
>> On 16/06/26 7:13 pm, David Hildenbrand (Arm) wrote:
>>>
>>> Avoid talking about "next patch". Phrase it as "In preparation for batching...".
>>>
>>>
>>> Below you have
>>>
>>>
>>> Could we easily extend set_ptes() to allow for non-present -> non-present with
>>> nr > 1?
>>
>> We could have a set_nonpresent_ptes() in general, but then for some non-present
>> configs like in this patch, we don't need to change the pfn, while in some
>> configs like setting swp ptes in one go (like I do in later patches) we have
>> an underlying pfn. So I don't see an obvious simplification with a common
>> helper for non-present -> non-present for nr > 1.
>
> I think a "non-present" entry always means a softleaf? In that case, we can
> simply branch on softleaf_has_pfn().
We could, but it might turn the overall function more expensive by throwing in
additional runtime checks that the compiler will not really optimize out. Worth
playing with.
--
Cheers,
David
next prev parent reply other threads:[~2026-07-07 13:48 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-26 6:36 [PATCH v4 00/12] Optimize anonymous large folio unmapping Dev Jain
2026-05-26 6:36 ` [PATCH v4 01/12] mm/rmap: convert page -> folio for hwpoison checks Dev Jain
2026-06-09 13:44 ` David Hildenbrand (Arm)
2026-06-10 7:02 ` Dev Jain
2026-06-10 12:13 ` David Hildenbrand (Arm)
2026-05-26 6:36 ` [PATCH v4 02/12] mm/rmap: Add try_to_unmap_hugetlb_one Dev Jain
2026-06-09 14:16 ` David Hildenbrand (Arm)
2026-06-18 7:44 ` Lance Yang
2026-06-18 7:55 ` David Hildenbrand (Arm)
2026-06-18 9:09 ` Lance Yang
2026-06-18 9:43 ` David Hildenbrand (Arm)
2026-06-18 10:01 ` Lance Yang
2026-06-22 8:13 ` Dev Jain
2026-06-22 8:14 ` Lance Yang
2026-06-22 8:14 ` Dev Jain
2026-06-22 8:17 ` David Hildenbrand (Arm)
2026-06-24 5:50 ` Dev Jain
2026-06-24 6:58 ` Lance Yang
2026-06-23 8:40 ` Dev Jain
2026-06-23 11:49 ` David Hildenbrand (Arm)
2026-05-26 6:36 ` [PATCH v4 03/12] mm/rmap: refactor some code around lazyfree folio unmapping Dev Jain
2026-06-09 14:20 ` David Hildenbrand (Arm)
2026-06-23 8:42 ` Dev Jain
2026-06-29 12:30 ` David Hildenbrand (Arm)
2026-05-26 6:36 ` [PATCH v4 04/12] mm/memory: Batch set uffd-wp markers during zapping Dev Jain
2026-06-16 13:43 ` David Hildenbrand (Arm)
2026-06-23 10:01 ` Dev Jain
2026-06-27 9:00 ` Dev Jain
2026-07-07 13:47 ` David Hildenbrand (Arm) [this message]
2026-05-26 6:36 ` [PATCH v4 05/12] mm/rmap: batch unmap folios belonging to uffd-wp VMAs Dev Jain
2026-05-26 6:36 ` [PATCH v4 06/12] mm/swap: rename subpage->page in folio_dup_swap/folio_put_swap Dev Jain
2026-06-16 13:47 ` David Hildenbrand (Arm)
2026-05-26 6:36 ` [PATCH v4 07/12] mm/swapfile: Add batched version of folio_dup_swap Dev Jain
2026-06-16 13:50 ` David Hildenbrand (Arm)
2026-06-16 13:51 ` David Hildenbrand (Arm)
2026-05-26 6:36 ` [PATCH v4 08/12] mm/swapfile: Add batched version of folio_put_swap Dev Jain
2026-06-16 13:54 ` David Hildenbrand (Arm)
2026-06-23 10:03 ` Dev Jain
2026-05-26 6:36 ` [PATCH v4 09/12] mm/rmap: Add batched version of folio_try_share_anon_rmap_pte Dev Jain
2026-06-16 14:04 ` David Hildenbrand (Arm)
2026-06-23 10:05 ` Dev Jain
2026-05-26 6:36 ` [PATCH v4 10/12] mm/rmap: refactor anon folio unmap in try_to_unmap_one Dev Jain
2026-06-16 14:10 ` David Hildenbrand (Arm)
2026-06-23 11:01 ` Dev Jain
2026-05-26 6:36 ` [PATCH v4 11/12] mm/mprotect: drop 'sub' from page_anon_exclusive_sub_batch Dev Jain
2026-06-16 14:12 ` David Hildenbrand (Arm)
2026-06-23 11:02 ` Dev Jain
2026-05-26 6:36 ` [PATCH v4 12/12] mm/rmap: enable batch unmapping of anonymous folios Dev Jain
2026-05-28 16:50 ` [PATCH v4 00/12] Optimize anonymous large folio unmapping Dev Jain
2026-06-09 13:24 ` David Hildenbrand (Arm)
2026-06-09 14:18 ` David Hildenbrand (Arm)
2026-06-23 11:04 ` Dev Jain
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