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[2003:d8:2f28:4900:2c24:4e20:1f21:9fbd]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-3b5e8e14e82sm15213383f8f.71.2025.07.15.06.23.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 15 Jul 2025 06:23:51 -0700 (PDT) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, xen-devel@lists.xenproject.org, linux-fsdevel@vger.kernel.org, nvdimm@lists.linux.dev, David Hildenbrand , Andrew Morton , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , Dan Williams , Matthew Wilcox , Jan Kara , Alexander Viro , Christian Brauner , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Jann Horn , Pedro Falcato , Hugh Dickins , Oscar Salvador , Lance Yang Subject: [PATCH v1 0/9] mm: vm_normal_page*() improvements Date: Tue, 15 Jul 2025 15:23:41 +0200 Message-ID: <20250715132350.2448901-1-david@redhat.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This is the follow-up of [1]: [PATCH RFC 00/14] mm: vm_normal_page*() + CoW PFNMAP improvements Based on mm/mm-new. I dropped the CoW PFNMAP changes for now, still working on a better way to sort all that out cleanly. Cleanup and unify vm_normal_page_*() handling, also marking the huge zerofolio as special in the PMD. Add+use vm_normal_page_pud() and cleanup that XEN vm_ops->find_special_page thingy. There are plans of using vm_normal_page_*() more widely soon. Briefly tested on UML (making sure vm_normal_page() still works as expected without pte_special() support) and on x86-64 with a bunch of tests. [1] https://lkml.kernel.org/r/20250617154345.2494405-1-david@redhat.com RFC -> v1: * Dropped the highest_memmap_pfn removal stuff and instead added "mm/memory: convert print_bad_pte() to print_bad_page_map()" * Dropped "mm: compare pfns only if the entry is present when inserting pfns/pages" for now, will probably clean that up separately. * Dropped "mm: remove "horrible special case to handle copy-on-write behaviour"", and "mm: drop addr parameter from vm_normal_*_pmd()" will require more thought * "mm/huge_memory: support huge zero folio in vmf_insert_folio_pmd()" -> Extend patch description. * "fs/dax: use vmf_insert_folio_pmd() to insert the huge zero folio" -> Extend patch description. * "mm/huge_memory: mark PMD mappings of the huge zero folio special" -> Remove comment from vm_normal_page_pmd(). * "mm/memory: factor out common code from vm_normal_page_*()" -> Adjust to print_bad_page_map()/highest_memmap_pfn changes. -> Add proper kernel doc to all involved functions * "mm: introduce and use vm_normal_page_pud()" -> Adjust to print_bad_page_map() changes. Cc: Andrew Morton Cc: Juergen Gross Cc: Stefano Stabellini Cc: Oleksandr Tyshchenko Cc: Dan Williams Cc: Matthew Wilcox Cc: Jan Kara Cc: Alexander Viro Cc: Christian Brauner Cc: Lorenzo Stoakes Cc: "Liam R. Howlett" Cc: Vlastimil Babka Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Michal Hocko Cc: Zi Yan Cc: Baolin Wang Cc: Nico Pache Cc: Ryan Roberts Cc: Dev Jain Cc: Barry Song Cc: Jann Horn Cc: Pedro Falcato Cc: Hugh Dickins Cc: Oscar Salvador Cc: Lance Yang David Hildenbrand (9): mm/huge_memory: move more common code into insert_pmd() mm/huge_memory: move more common code into insert_pud() mm/huge_memory: support huge zero folio in vmf_insert_folio_pmd() fs/dax: use vmf_insert_folio_pmd() to insert the huge zero folio mm/huge_memory: mark PMD mappings of the huge zero folio special mm/memory: convert print_bad_pte() to print_bad_page_map() mm/memory: factor out common code from vm_normal_page_*() mm: introduce and use vm_normal_page_pud() mm: rename vm_ops->find_special_page() to vm_ops->find_normal_page() drivers/xen/Kconfig | 1 + drivers/xen/gntdev.c | 5 +- fs/dax.c | 47 +---- include/linux/mm.h | 20 +- mm/Kconfig | 2 + mm/huge_memory.c | 119 ++++------- mm/memory.c | 346 ++++++++++++++++++++++--------- mm/pagewalk.c | 20 +- tools/testing/vma/vma_internal.h | 18 +- 9 files changed, 343 insertions(+), 235 deletions(-) base-commit: 64d19a2cdb7b62bcea83d9309d83e06d7aff4722 -- 2.50.1