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Wed, 13 May 2026 06:09:56 -0700 (PDT) From: Muchun Song To: Andrew Morton , David Hildenbrand , Muchun Song , Oscar Salvador , Michael Ellerman , Madhavan Srinivasan Cc: Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Nicholas Piggin , Christophe Leroy , Ackerley Tng , Frank van der Linden , aneesh.kumar@linux.ibm.com, joao.m.martins@oracle.com, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Muchun Song Subject: [PATCH v2 26/69] mm/sparse-vmemmap: Support section-based vmemmap accounting Date: Wed, 13 May 2026 21:04:54 +0800 Message-ID: <20260513130542.35604-27-songmuchun@bytedance.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260513130542.35604-1-songmuchun@bytedance.com> References: <20260513130542.35604-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 2AA6C80011 X-Stat-Signature: 1snbfb6aikpyuxrpfwmogpofymgh5tua X-HE-Tag: 1778677797-577749 X-HE-Meta: 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 eCHjEMbG bMbV4AMDDCWg/IzLDky3IfHMGklidK6VtuhPOgGO8i/Lku53G57HzOLXeibTPwTRjwE+Z6IpzU27djGsLMAVGzFQ/MNeGn75G/bG9IZ1vGxkTpK47j933CQaef8B9ufDM27Mf3MD2/O85xo4Qla70IhaCezbZHM31CcNWvv5dyKmgbA6Vw2OOTteNpt8xgOHHpdqeBK2LNEXmdkYN+6WVwbe7GtsuJJbVj6ErJlylwuQNArrbWUSHY9AOEVHItFlugn2trNVddByg4p/SwJs2q1NbzzWwOWg8SU+UDW9MuSU7OJiZrXUtH9smhl8xyFaZ8Zihn20HHwsu1t+8VD/sDKCppg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Teach section_nr_vmemmap_pages() to account for section-based vmemmap optimization, so the helper can report the vmemmap page usage for a memory section with or without shared tail vmemmap pages. Signed-off-by: Muchun Song --- include/linux/mmzone.h | 8 ++++++++ mm/sparse-vmemmap.c | 13 +++++++++---- 2 files changed, 17 insertions(+), 4 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 5fc968bac1f7..0974205abd3d 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -2269,6 +2269,14 @@ static inline unsigned int pfn_to_section_order(unsigned long pfn) return section_order(__pfn_to_section(pfn)); } +static inline bool section_vmemmap_optimizable(const struct mem_section *section) +{ + if (!is_power_of_2(sizeof(struct page))) + return false; + + return section_order(section) >= OPTIMIZABLE_FOLIO_MIN_ORDER; +} + void sparse_init_early_section(int nid, struct page *map, unsigned long pnum, unsigned long flags); diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c index 60d5330a8399..94964363d95c 100644 --- a/mm/sparse-vmemmap.c +++ b/mm/sparse-vmemmap.c @@ -629,24 +629,29 @@ void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn) static int __meminit section_nr_vmemmap_pages(unsigned long pfn, unsigned long nr_pages, struct vmem_altmap *altmap, struct dev_pagemap *pgmap) { - const unsigned int order = pgmap ? pgmap->vmemmap_shift : 0; + const struct mem_section *ms = __pfn_to_section(pfn); + const unsigned int order = pgmap ? pgmap->vmemmap_shift : section_order(ms); const unsigned long pages_per_compound = 1UL << order; + unsigned int vmemmap_pages = OPTIMIZED_FOLIO_VMEMMAP_PAGES; VM_WARN_ON_ONCE(!IS_ALIGNED(pfn | nr_pages, PAGES_PER_SUBSECTION)); VM_WARN_ON_ONCE(nr_pages > PAGES_PER_SECTION); - if (!vmemmap_can_optimize(altmap, pgmap)) + if (vmemmap_can_optimize(altmap, pgmap)) + vmemmap_pages = VMEMMAP_RESERVE_NR; + + if (!vmemmap_can_optimize(altmap, pgmap) && !section_vmemmap_optimizable(ms)) return DIV_ROUND_UP(nr_pages * sizeof(struct page), PAGE_SIZE); if (order < PFN_SECTION_SHIFT) { VM_WARN_ON_ONCE(!IS_ALIGNED(pfn | nr_pages, pages_per_compound)); - return VMEMMAP_RESERVE_NR * nr_pages / pages_per_compound; + return vmemmap_pages * nr_pages / pages_per_compound; } VM_WARN_ON_ONCE(!IS_ALIGNED(pfn | nr_pages, PAGES_PER_SECTION)); if (IS_ALIGNED(pfn, pages_per_compound)) - return VMEMMAP_RESERVE_NR; + return vmemmap_pages; return 0; } -- 2.54.0