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GET /api/1.2/patches/2219951/?format=api
{ "id": 2219951, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2219951/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260405125240.2558577-27-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": "<20260405125240.2558577-27-songmuchun@bytedance.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260405125240.2558577-27-songmuchun@bytedance.com/", "date": "2026-04-05T12:52:17", "name": "[26/49] mm/hugetlb: use generic vmemmap optimization macros", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "7345314f154159c55807ac4c43658aaf1effb9b8", "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/20260405125240.2558577-27-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/2219951/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219951/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19356-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=ehEcaRVZ;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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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 26/49] mm/hugetlb: use generic vmemmap optimization macros", "Date": "Sun, 5 Apr 2026 20:52:17 +0800", "Message-Id": "<20260405125240.2558577-27-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": "Use the generic macros OPTIMIZED_FOLIO_VMEMMAP_SIZE,\nOPTIMIZED_FOLIO_VMEMMAP_PAGE_STRUCTS and OPTIMIZED_FOLIO_VMEMMAP_PAGES\ninstead of the hugetlb-specific HUGETLB_VMEMMAP_RESERVE_SIZE and\nHUGETLB_VMEMMAP_RESERVE_PAGES to describe the vmemmap-optimized folio.\n\nSigned-off-by: Muchun Song <songmuchun@bytedance.com>\n---\n mm/hugetlb.c | 4 ++--\n mm/hugetlb_vmemmap.c | 14 +++++++-------\n mm/hugetlb_vmemmap.h | 9 +--------\n 3 files changed, 10 insertions(+), 17 deletions(-)", "diff": "diff --git a/mm/hugetlb.c b/mm/hugetlb.c\nindex a00c9f3672b7..a7e0599802cb 100644\n--- a/mm/hugetlb.c\n+++ b/mm/hugetlb.c\n@@ -3241,7 +3241,7 @@ static void __init prep_and_add_bootmem_folios(struct hstate *h,\n \t\t\t * be no contention.\n \t\t\t */\n \t\t\thugetlb_folio_init_tail_vmemmap(folio, h,\n-\t\t\t\t\tHUGETLB_VMEMMAP_RESERVE_PAGES,\n+\t\t\t\t\tOPTIMIZED_FOLIO_VMEMMAP_PAGE_STRUCTS,\n \t\t\t\t\tpages_per_huge_page(h));\n \t\t}\n \t\thugetlb_bootmem_init_migratetype(folio, h);\n@@ -3280,7 +3280,7 @@ static void __init gather_bootmem_prealloc_node(unsigned long nid)\n \t\tWARN_ON(folio_ref_count(folio) != 1);\n \n \t\thugetlb_folio_init_vmemmap(folio, h,\n-\t\t\t\t\t HUGETLB_VMEMMAP_RESERVE_PAGES);\n+\t\t\t\t\t OPTIMIZED_FOLIO_VMEMMAP_PAGE_STRUCTS);\n \t\tinit_new_hugetlb_folio(folio);\n \n \t\tif (hugetlb_bootmem_page_prehvo(m))\ndiff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c\nindex d6dd47c232e0..0af528c0e229 100644\n--- a/mm/hugetlb_vmemmap.c\n+++ b/mm/hugetlb_vmemmap.c\n@@ -407,7 +407,7 @@ static int __hugetlb_vmemmap_restore_folio(const struct hstate *h,\n \tvmemmap_start\t= (unsigned long)&folio->page;\n \tvmemmap_end\t= vmemmap_start + hugetlb_vmemmap_size(h);\n \n-\tvmemmap_start\t+= HUGETLB_VMEMMAP_RESERVE_SIZE;\n+\tvmemmap_start\t+= OPTIMIZED_FOLIO_VMEMMAP_SIZE;\n \n \t/*\n \t * The pages which the vmemmap virtual address range [@vmemmap_start,\n@@ -637,10 +637,10 @@ static void __hugetlb_vmemmap_optimize_folios(struct hstate *h,\n \t\t\tspfn = (unsigned long)&folio->page;\n \t\t\tepfn = spfn + pages_per_huge_page(h);\n \t\t\tvmemmap_wrprotect_hvo(spfn, epfn, folio_nid(folio),\n-\t\t\t\t\tHUGETLB_VMEMMAP_RESERVE_SIZE);\n+\t\t\t\t\tOPTIMIZED_FOLIO_VMEMMAP_SIZE);\n \t\t\tregister_page_bootmem_memmap(pfn_to_section_nr(spfn),\n \t\t\t\t\t&folio->page,\n-\t\t\t\t\tHUGETLB_VMEMMAP_RESERVE_SIZE);\n+\t\t\t\t\tOPTIMIZED_FOLIO_VMEMMAP_SIZE);\n \t\t\tcontinue;\n \t\t}\n \n@@ -791,8 +791,8 @@ void __init hugetlb_vmemmap_init_early(int nid)\n \t\tzone = pfn_to_zone(nid, pfn);\n \n \t\tBUG_ON(vmemmap_populate_hvo(start, end, huge_page_order(m->hstate),\n-\t\t\t\t\t zone, HUGETLB_VMEMMAP_RESERVE_SIZE));\n-\t\tmemmap_boot_pages_add(HUGETLB_VMEMMAP_RESERVE_SIZE / PAGE_SIZE);\n+\t\t\t\t\t zone, OPTIMIZED_FOLIO_VMEMMAP_SIZE));\n+\t\tmemmap_boot_pages_add(OPTIMIZED_FOLIO_VMEMMAP_PAGES);\n \n \t\tpnum = pfn_to_section_nr(pfn);\n \t\tns = psize / section_size;\n@@ -824,8 +824,8 @@ static int __init hugetlb_vmemmap_init(void)\n \tconst struct hstate *h;\n \tstruct zone *zone;\n \n-\t/* HUGETLB_VMEMMAP_RESERVE_SIZE should cover all used struct pages */\n-\tBUILD_BUG_ON(__NR_USED_SUBPAGE > HUGETLB_VMEMMAP_RESERVE_PAGES);\n+\t/* OPTIMIZED_FOLIO_VMEMMAP_SIZE should cover all used struct pages */\n+\tBUILD_BUG_ON(__NR_USED_SUBPAGE > OPTIMIZED_FOLIO_VMEMMAP_PAGE_STRUCTS);\n \n \tfor_each_zone(zone) {\n \t\tfor (int i = 0; i < NR_OPTIMIZABLE_FOLIO_SIZES; i++) {\ndiff --git a/mm/hugetlb_vmemmap.h b/mm/hugetlb_vmemmap.h\nindex 7ac49c52457d..66e11893d076 100644\n--- a/mm/hugetlb_vmemmap.h\n+++ b/mm/hugetlb_vmemmap.h\n@@ -12,13 +12,6 @@\n #include <linux/io.h>\n #include <linux/memblock.h>\n \n-/*\n- * Reserve one vmemmap page, all vmemmap addresses are mapped to it. See\n- * Documentation/mm/vmemmap_dedup.rst.\n- */\n-#define HUGETLB_VMEMMAP_RESERVE_SIZE\tPAGE_SIZE\n-#define HUGETLB_VMEMMAP_RESERVE_PAGES\t(HUGETLB_VMEMMAP_RESERVE_SIZE / sizeof(struct page))\n-\n #ifdef CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP\n int hugetlb_vmemmap_restore_folio(const struct hstate *h, struct folio *folio);\n long hugetlb_vmemmap_restore_folios(const struct hstate *h,\n@@ -43,7 +36,7 @@ static inline unsigned int hugetlb_vmemmap_size(const struct hstate *h)\n */\n static inline unsigned int hugetlb_vmemmap_optimizable_size(const struct hstate *h)\n {\n-\tint size = hugetlb_vmemmap_size(h) - HUGETLB_VMEMMAP_RESERVE_SIZE;\n+\tint size = hugetlb_vmemmap_size(h) - OPTIMIZED_FOLIO_VMEMMAP_SIZE;\n \n \tif (!is_power_of_2(sizeof(struct page)))\n \t\treturn 0;\n", "prefixes": [ "26/49" ] }