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GET /api/1.2/patches/2219966/?format=api
{ "id": 2219966, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2219966/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260405125240.2558577-42-songmuchun@bytedance.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.2/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260405125240.2558577-42-songmuchun@bytedance.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260405125240.2558577-42-songmuchun@bytedance.com/", "date": "2026-04-05T12:52:32", "name": "[41/49] mm/sparse: simplify section_vmemmap_pages()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "ac97811361b53d03bdfb5ca507169bf9a9dde2f6", "submitter": { "id": 78930, "url": "http://patchwork.ozlabs.org/api/1.2/people/78930/?format=api", "name": "Muchun Song", "email": "songmuchun@bytedance.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260405125240.2558577-42-songmuchun@bytedance.com/mbox/", "series": [ { "id": 498783, "url": "http://patchwork.ozlabs.org/api/1.2/series/498783/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=498783", "date": "2026-04-05T12:51:51", "name": "mm: Generalize vmemmap optimization for DAX and HugeTLB", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/498783/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2219966/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219966/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19371-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=bytedance.com header.i=@bytedance.com\n header.a=rsa-sha256 header.s=google header.b=KwVAu36Y;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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Howlett\" <Liam.Howlett@oracle.com>,\n\tVlastimil Babka <vbabka@kernel.org>,\n\tMike Rapoport <rppt@kernel.org>,\n\tSuren Baghdasaryan <surenb@google.com>,\n\tMichal Hocko <mhocko@suse.com>,\n\tNicholas Piggin <npiggin@gmail.com>,\n\tChristophe Leroy <chleroy@kernel.org>,\n\taneesh.kumar@linux.ibm.com,\n\tjoao.m.martins@oracle.com,\n\tlinux-mm@kvack.org,\n\tlinuxppc-dev@lists.ozlabs.org,\n\tlinux-kernel@vger.kernel.org,\n\tMuchun Song <songmuchun@bytedance.com>", "Subject": "[PATCH 41/49] mm/sparse: simplify section_vmemmap_pages()", "Date": "Sun, 5 Apr 2026 20:52:32 +0800", "Message-Id": "<20260405125240.2558577-42-songmuchun@bytedance.com>", "X-Mailer": "git-send-email 2.20.1", "In-Reply-To": "<20260405125240.2558577-1-songmuchun@bytedance.com>", "References": "<20260405125240.2558577-1-songmuchun@bytedance.com>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "After unifying DAX and HugeTLB vmemmap optimizations, we can now\nsimplify section_vmemmap_pages().\n\nPreviously, section_vmemmap_pages() needed to take altmap and pgmap\narguments to determine if vmemmap optimization was enabled. However,\nsparse_add_section() already sets the section order using\nsection_set_order(ms, pgmap->vmemmap_shift) if vmemmap_can_optimize()\nis true and the size is aligned to PAGES_PER_SECTION.\n\nAs a result, section_vmemmap_optimizable(ms) is sufficient to determine\nif the section can be optimized, and section_order(ms) can directly\nprovide the order, making the altmap and pgmap arguments redundant.\n\nRemove the unused altmap and pgmap arguments from\nsection_vmemmap_pages().\n\nSigned-off-by: Muchun Song <songmuchun@bytedance.com>\n---\n mm/internal.h | 3 +--\n mm/sparse-vmemmap.c | 8 +++-----\n mm/sparse.c | 18 ++++++------------\n 3 files changed, 10 insertions(+), 19 deletions(-)", "diff": "diff --git a/mm/internal.h b/mm/internal.h\nindex b569d8309f4d..7f0731e5c84f 100644\n--- a/mm/internal.h\n+++ b/mm/internal.h\n@@ -998,8 +998,7 @@ static inline void __section_mark_present(struct mem_section *ms,\n \tms->section_mem_map |= SECTION_MARKED_PRESENT;\n }\n \n-int section_vmemmap_pages(unsigned long pfn, unsigned long nr_pages,\n-\t\t\t struct vmem_altmap *altmap, struct dev_pagemap *pgmap);\n+int section_vmemmap_pages(unsigned long pfn, unsigned long nr_pages);\n #else\n static inline void memblocks_present(void) {}\n static inline void sparse_init(void) {}\ndiff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c\nindex ba8c0c64f160..ac2efba9ef92 100644\n--- a/mm/sparse-vmemmap.c\n+++ b/mm/sparse-vmemmap.c\n@@ -608,12 +608,10 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages,\n \t * section_activate() and pfn_valid() .\n \t */\n \tif (!section_is_early) {\n-\t\tmemmap_pages_add(-section_vmemmap_pages(pfn, nr_pages, altmap,\n-\t\t\t\t\t\t\tpgmap));\n+\t\tmemmap_pages_add(-section_vmemmap_pages(pfn, nr_pages));\n \t\tdepopulate_section_memmap(pfn, nr_pages, altmap);\n \t} else if (memmap) {\n-\t\tmemmap_pages_add(-section_vmemmap_pages(pfn, nr_pages, altmap,\n-\t\t\t\t\t\t\tpgmap));\n+\t\tmemmap_pages_add(-section_vmemmap_pages(pfn, nr_pages));\n \t\tfree_map_bootmem(memmap);\n \t}\n \n@@ -658,7 +656,7 @@ static struct page * __meminit section_activate(int nid, unsigned long pfn,\n \t\treturn pfn_to_page(pfn);\n \n \tmemmap = populate_section_memmap(pfn, nr_pages, nid, altmap, pgmap);\n-\tmemmap_pages_add(section_vmemmap_pages(pfn, nr_pages, altmap, pgmap));\n+\tmemmap_pages_add(section_vmemmap_pages(pfn, nr_pages));\n \tif (!memmap) {\n \t\tsection_deactivate(pfn, nr_pages, altmap, pgmap);\n \t\treturn ERR_PTR(-ENOMEM);\ndiff --git a/mm/sparse.c b/mm/sparse.c\nindex 04c641b97325..163bb17bba96 100644\n--- a/mm/sparse.c\n+++ b/mm/sparse.c\n@@ -345,28 +345,23 @@ static void __init sparse_usage_fini(void)\n \tsparse_usagebuf = sparse_usagebuf_end = NULL;\n }\n \n-int __meminit section_vmemmap_pages(unsigned long pfn, unsigned long nr_pages,\n-\t\t\t\t struct vmem_altmap *altmap, struct dev_pagemap *pgmap)\n+int __meminit section_vmemmap_pages(unsigned long pfn, unsigned long nr_pages)\n {\n \tconst struct mem_section *ms = __pfn_to_section(pfn);\n-\tunsigned int order = pgmap ? pgmap->vmemmap_shift : section_order(ms);\n+\tunsigned int order = section_order(ms);\n \tunsigned long pages_per_compound = 1L << order;\n-\tunsigned int vmemmap_pages = OPTIMIZED_FOLIO_VMEMMAP_PAGES;\n-\n-\tif (vmemmap_can_optimize(altmap, pgmap))\n-\t\tvmemmap_pages = VMEMMAP_RESERVE_NR;\n \n \tVM_BUG_ON(!IS_ALIGNED(pfn | nr_pages, min(pages_per_compound, PAGES_PER_SECTION)));\n \tVM_BUG_ON(pfn_to_section_nr(pfn) != pfn_to_section_nr(pfn + nr_pages - 1));\n \n-\tif (!vmemmap_can_optimize(altmap, pgmap) && !section_vmemmap_optimizable(ms))\n+\tif (!section_vmemmap_optimizable(ms))\n \t\treturn DIV_ROUND_UP(nr_pages * sizeof(struct page), PAGE_SIZE);\n \n \tif (order < PFN_SECTION_SHIFT)\n-\t\treturn vmemmap_pages * nr_pages / pages_per_compound;\n+\t\treturn OPTIMIZED_FOLIO_VMEMMAP_PAGES * nr_pages / pages_per_compound;\n \n \tif (IS_ALIGNED(pfn, pages_per_compound))\n-\t\treturn vmemmap_pages;\n+\t\treturn OPTIMIZED_FOLIO_VMEMMAP_PAGES;\n \n \treturn 0;\n }\n@@ -396,8 +391,7 @@ static void __init sparse_init_nid(int nid, unsigned long pnum_begin,\n \t\t\t\t\t\tnid, NULL, NULL);\n \t\tif (!map)\n \t\t\tpanic(\"Populate section (%ld) on node[%d] failed\\n\", pnum, nid);\n-\t\tmemmap_boot_pages_add(section_vmemmap_pages(pfn, PAGES_PER_SECTION,\n-\t\t\t\t\t\t\t NULL, NULL));\n+\t\tmemmap_boot_pages_add(section_vmemmap_pages(pfn, PAGES_PER_SECTION));\n \t\tsparse_init_early_section(nid, map, pnum, 0);\n \t}\n \tsparse_usage_fini();\n", "prefixes": [ "41/49" ] }