From: David Hildenbrand <david@redhat.com>
To: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, Zi Yan <ziy@nvidia.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
Barry Song <baohua@kernel.org>, Lance Yang <lance.yang@linux.dev>,
Liam.Howlett@oracle.com,
Sidhartha Kumar <sidhartha.kumar@oracle.com>
Subject: Re: [PATCH v3 2/3] mm: mprotect: avoid unnecessary struct page accessing if pte_protnone()
Date: Wed, 15 Oct 2025 19:45:24 +0200 [thread overview]
Message-ID: <2c2a9527-e52b-46db-ac8b-b13f4ba6d0cb@redhat.com> (raw)
In-Reply-To: <db3fedc0-6ed3-429d-b124-d1e67992d6f8@lucifer.local>
On 15.10.25 17:43, Lorenzo Stoakes wrote:
> On Wed, Oct 15, 2025 at 08:35:15PM +0800, Kefeng Wang wrote:
>> If the pte_protnone() is true, we could avoid unnecessary struct page
>> accessing and reduce cache footprint when scanning page tables for prot
>> numa, the performance test of pmbench memory accessing benchmark
>> should be benifit, see more commit a818f5363a0e ("autonuma: reduce cache
>> footprint when scanning page tables").
>
> Hm should benefit? But you've not tested it? Seems like rather than
> guessing you should actually give data. Otherwise I don't know why we're
> referencing a benchmark.
I guess it might be harder to quantify, but theoretically it makes sense
to me to just skip in any case.
... and it enables patch #3, which is nice :)
--
Cheers
David / dhildenb
next prev parent reply other threads:[~2025-10-15 17:45 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-15 12:35 [PATCH v3 0/3] mm: some optimizations for prot numa Kefeng Wang
2025-10-15 12:35 ` [PATCH v3 1/3] mm: mprotect: always skip dma pinned folio in prot_numa_skip() Kefeng Wang
2025-10-15 15:32 ` Lorenzo Stoakes
2025-10-16 1:00 ` Kefeng Wang
2025-10-16 21:10 ` Andrew Morton
2025-10-17 8:46 ` Lorenzo Stoakes
2025-10-17 14:12 ` Kefeng Wang
2025-10-16 1:14 ` Zi Yan
2025-10-16 17:53 ` Dev Jain
2025-10-15 12:35 ` [PATCH v3 2/3] mm: mprotect: avoid unnecessary struct page accessing if pte_protnone() Kefeng Wang
2025-10-15 15:43 ` Lorenzo Stoakes
2025-10-15 17:45 ` David Hildenbrand [this message]
2025-10-16 1:07 ` Kefeng Wang
2025-10-17 8:47 ` Lorenzo Stoakes
2025-10-17 8:46 ` Lorenzo Stoakes
2025-10-16 1:28 ` Zi Yan
2025-10-16 1:35 ` Kefeng Wang
2025-10-16 18:02 ` Dev Jain
2025-10-15 12:35 ` [PATCH v3 3/3] mm: huge_memory: use folio_needs_prot_numa() for pmd folio Kefeng Wang
2025-10-16 19:19 ` David Hildenbrand
2025-10-17 10:07 ` Lorenzo Stoakes
2025-10-17 14:13 ` Kefeng Wang
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