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[2003:cb:c721:a000:7426:f6b4:82a3:c6ab]) by smtp.gmail.com with ESMTPSA id k24-20020a5d5258000000b00332c0aace23sm3722896wrc.105.2023.11.24.00.53.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 24 Nov 2023 00:53:02 -0800 (PST) Message-ID: <1fb403e1-58f0-414c-be36-4872bc0ac0ae@redhat.com> Date: Fri, 24 Nov 2023 09:53:01 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 01/14] mm: Batch-copy PTE ranges during fork() To: Ryan Roberts , Catalin Marinas , Will Deacon , Ard Biesheuvel , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Andrew Morton , Anshuman Khandual , Matthew Wilcox , Yu Zhao , Mark Rutland , Kefeng Wang , John Hubbard , Zi Yan Cc: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20231115163018.1303287-1-ryan.roberts@arm.com> <20231115163018.1303287-2-ryan.roberts@arm.com> <89a9fe07-a5c5-4a99-b588-e6145053c58f@redhat.com> <1459f78b-e80c-4f21-bc65-f0ab259d348a@arm.com> <08ef2c36-2b9c-4b96-9d1d-68cca0f68ba5@redhat.com> <2d027a8d-adfb-481d-89ea-c99139e669aa@arm.com> <2618b024-6a95-4bfc-a08d-59d86e9931e5@redhat.com> <118eb2d3-d504-49f0-b7f2-f29b64a8f404@arm.com> <15e2c6cb-e86d-417b-b83d-7c7459d5be8f@redhat.com> <42f9e03f-86ad-418e-a337-7aef202e6a5b@arm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org >> One could simply skip batching for now on pte_protnone() and focus on the >> "writable" vs. "not-writable". > > I'm not sure we can simply "skip" batching on pte_protnone() since we will need > to terminate the batch if we spot it. But if we have to look for it anyway, we > might as well just terminate the batch when the value of pte_protnone() > *changes*. I'm also proposing to take this approach for pte_uffd_wp() which also > needs to be carefully preserved per-pte. Yes, that's what I meant. -- Cheers, David / dhildenb _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel