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GET /api/1.2/patches/2219941/?format=api
{ "id": 2219941, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2219941/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260405125240.2558577-17-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": "<20260405125240.2558577-17-songmuchun@bytedance.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260405125240.2558577-17-songmuchun@bytedance.com/", "date": "2026-04-05T12:52:07", "name": "[16/49] mm/hugetlb: initialize vmemmap optimization in early stage", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c19c2e0c1fe65fbee07d6abe2baa375c87caf138", "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/20260405125240.2558577-17-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/2219941/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219941/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19346-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=a813gtRw;\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 16/49] mm/hugetlb: initialize vmemmap optimization in early\n stage", "Date": "Sun, 5 Apr 2026 20:52:07 +0800", "Message-Id": "<20260405125240.2558577-17-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": "Move pfn_to_zone() to be available for hugetlb_vmemmap_init_early().\nPopulate vmemmap HVO in hugetlb_vmemmap_init_early() for bootmem allocated\nhuge pages.\n\nThe zone information is already available in hugetlb_vmemmap_init_early(),\nso there is no need to wait for hugetlb_vmemmap_init_late() to access it.\nThis prepares for the removal of hugetlb_vmemmap_init_late().\n\nSigned-off-by: Muchun Song <songmuchun@bytedance.com>\n---\n mm/hugetlb_vmemmap.c | 38 ++++++++++++++++++++++++--------------\n 1 file changed, 24 insertions(+), 14 deletions(-)", "diff": "diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c\nindex 50b7123f3bdd..e25c70453928 100644\n--- a/mm/hugetlb_vmemmap.c\n+++ b/mm/hugetlb_vmemmap.c\n@@ -745,6 +745,20 @@ static bool vmemmap_should_optimize_bootmem_page(struct huge_bootmem_page *m)\n \treturn true;\n }\n \n+static struct zone *pfn_to_zone(unsigned nid, unsigned long pfn)\n+{\n+\tstruct zone *zone;\n+\tenum zone_type zone_type;\n+\n+\tfor (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) {\n+\t\tzone = &NODE_DATA(nid)->node_zones[zone_type];\n+\t\tif (zone_spans_pfn(zone, pfn))\n+\t\t\treturn zone;\n+\t}\n+\n+\treturn NULL;\n+}\n+\n /*\n * Initialize memmap section for a gigantic page, HVO-style.\n */\n@@ -752,6 +766,7 @@ void __init hugetlb_vmemmap_init_early(int nid)\n {\n \tunsigned long psize, paddr, section_size;\n \tunsigned long ns, i, pnum, pfn, nr_pages;\n+\tunsigned long start, end;\n \tstruct huge_bootmem_page *m = NULL;\n \tvoid *map;\n \n@@ -761,6 +776,8 @@ void __init hugetlb_vmemmap_init_early(int nid)\n \tsection_size = (1UL << PA_SECTION_SHIFT);\n \n \tlist_for_each_entry(m, &huge_boot_pages[nid], list) {\n+\t\tstruct zone *zone;\n+\n \t\tif (!vmemmap_should_optimize_bootmem_page(m))\n \t\t\tcontinue;\n \n@@ -769,6 +786,13 @@ void __init hugetlb_vmemmap_init_early(int nid)\n \t\tpaddr = virt_to_phys(m);\n \t\tpfn = PHYS_PFN(paddr);\n \t\tmap = pfn_to_page(pfn);\n+\t\tstart = (unsigned long)map;\n+\t\tend = start + nr_pages * sizeof(struct page);\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 \n \t\tpnum = pfn_to_section_nr(pfn);\n \t\tns = psize / section_size;\n@@ -784,20 +808,6 @@ void __init hugetlb_vmemmap_init_early(int nid)\n \t}\n }\n \n-static struct zone *pfn_to_zone(unsigned nid, unsigned long pfn)\n-{\n-\tstruct zone *zone;\n-\tenum zone_type zone_type;\n-\n-\tfor (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) {\n-\t\tzone = &NODE_DATA(nid)->node_zones[zone_type];\n-\t\tif (zone_spans_pfn(zone, pfn))\n-\t\t\treturn zone;\n-\t}\n-\n-\treturn NULL;\n-}\n-\n void __init hugetlb_vmemmap_init_late(int nid)\n {\n \tstruct huge_bootmem_page *m, *tm;\n", "prefixes": [ "16/49" ] }