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GET /api/1.2/patches/2219940/?format=api
{ "id": 2219940, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2219940/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260405125240.2558577-16-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": "<20260405125240.2558577-16-songmuchun@bytedance.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260405125240.2558577-16-songmuchun@bytedance.com/", "date": "2026-04-05T12:52:06", "name": "[15/49] mm/hugetlb: free cross-zone bootmem gigantic pages after allocation", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "a11dd79f6ff8cebdb96852d8b1cd18b023a0b5b6", "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/20260405125240.2558577-16-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/2219940/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219940/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19345-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=gRZckZkl;\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 15/49] mm/hugetlb: free cross-zone bootmem gigantic pages\n after allocation", "Date": "Sun, 5 Apr 2026 20:52:06 +0800", "Message-Id": "<20260405125240.2558577-16-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 moving hugetlb reservation after free_area_init(), zone information\nbecomes available during bootmem huge page allocation. This allows us to\nidentify and handle cross-zone gigantic pages more precisely.\n\nDuring alloc_bootmem(), pages that intersect multiple zones are added to\nthe head of huge_boot_pages[nid] list (without ZONES_VALID flag), while\npages with valid zones are added to the tail (with ZONES_VALID flag).\n\nAfter allocation completes, hugetlb_free_cross_zone_pages() iterates\nthrough the list and frees those cross-zone pages (entries without\nHUGE_BOOTMEM_ZONES_VALID flag). The count of freed pages is subtracted\nfrom the allocated count to ensure the final number reflects only valid\nhuge pages.\n\nThis applies to both per-node allocation path and the global gigantic\nallocation path, simplifying the code by avoiding cross-zone checks at\nlater stages.\n\nSigned-off-by: Muchun Song <songmuchun@bytedance.com>\n---\n mm/hugetlb.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++------\n 1 file changed, 47 insertions(+), 6 deletions(-)", "diff": "diff --git a/mm/hugetlb.c b/mm/hugetlb.c\nindex d6ea11113f1d..238495fd04e4 100644\n--- a/mm/hugetlb.c\n+++ b/mm/hugetlb.c\n@@ -3049,6 +3049,11 @@ struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,\n \treturn ERR_PTR(-ENOSPC);\n }\n \n+static bool __init hugetlb_bootmem_page_earlycma(struct huge_bootmem_page *m)\n+{\n+\treturn m->flags & HUGE_BOOTMEM_CMA;\n+}\n+\n static __init void *alloc_bootmem(struct hstate *h, int nid, bool node_exact)\n {\n \tstruct huge_bootmem_page *m;\n@@ -3092,7 +3097,14 @@ static __init void *alloc_bootmem(struct hstate *h, int nid, bool node_exact)\n \t\t * is not up yet.\n \t\t */\n \t\tINIT_LIST_HEAD(&m->list);\n-\t\tlist_add(&m->list, &huge_boot_pages[listnode]);\n+\t\tif (pfn_range_intersects_zones(listnode, PHYS_PFN(virt_to_phys(m)),\n+\t\t\t\t\t pages_per_huge_page(h))) {\n+\t\t\tVM_BUG_ON(hugetlb_bootmem_page_earlycma(m));\n+\t\t\tlist_add(&m->list, &huge_boot_pages[listnode]);\n+\t\t} else {\n+\t\t\tlist_add_tail(&m->list, &huge_boot_pages[listnode]);\n+\t\t\tm->flags |= HUGE_BOOTMEM_ZONES_VALID;\n+\t\t}\n \t\tm->hstate = h;\n \t}\n \n@@ -3186,11 +3198,6 @@ static bool __init hugetlb_bootmem_page_prehvo(struct huge_bootmem_page *m)\n \treturn m->flags & HUGE_BOOTMEM_HVO;\n }\n \n-static bool __init hugetlb_bootmem_page_earlycma(struct huge_bootmem_page *m)\n-{\n-\treturn m->flags & HUGE_BOOTMEM_CMA;\n-}\n-\n /*\n * memblock-allocated pageblocks might not have the migrate type set\n * if marked with the 'noinit' flag. Set it to the default (MIGRATE_MOVABLE)\n@@ -3393,6 +3400,34 @@ static void __init gather_bootmem_prealloc(void)\n \tpadata_do_multithreaded(&job);\n }\n \n+static unsigned long __init hugetlb_free_cross_zone_pages(struct hstate *h, int nid)\n+{\n+\tunsigned long freed = 0;\n+\tstruct huge_bootmem_page *m, *tmp;\n+\n+\tif (!hstate_is_gigantic(h))\n+\t\treturn freed;\n+\n+\tlist_for_each_entry_safe(m, tmp, &huge_boot_pages[nid], list) {\n+\t\tif (m->flags & HUGE_BOOTMEM_ZONES_VALID)\n+\t\t\tbreak;\n+\n+\t\tlist_del(&m->list);\n+\t\tmemblock_free(m, huge_page_size(h));\n+\t\tfreed++;\n+\t}\n+\n+\tif (freed) {\n+\t\tchar buf[32];\n+\n+\t\tstring_get_size(huge_page_size(h), 1, STRING_UNITS_2, buf, sizeof(buf));\n+\t\tpr_warn(\"HugeTLB: freeing %lu cross-zone hugepage of page size %s failed node%d.\\n\",\n+\t\t\tfreed, buf, nid);\n+\t}\n+\n+\treturn freed;\n+}\n+\n static void __init hugetlb_hstate_alloc_pages_onenode(struct hstate *h, int nid)\n {\n \tunsigned long i;\n@@ -3423,6 +3458,8 @@ static void __init hugetlb_hstate_alloc_pages_onenode(struct hstate *h, int nid)\n \t\tcond_resched();\n \t}\n \n+\ti -= hugetlb_free_cross_zone_pages(h, nid);\n+\n \tif (!list_empty(&folio_list))\n \t\tprep_and_add_allocated_folios(h, &folio_list);\n \n@@ -3496,6 +3533,7 @@ static void __init hugetlb_pages_alloc_boot_node(unsigned long start, unsigned l\n \n static unsigned long __init hugetlb_gigantic_pages_alloc_boot(struct hstate *h)\n {\n+\tint nid;\n \tunsigned long i;\n \n \tfor (i = 0; i < h->max_huge_pages; ++i) {\n@@ -3504,6 +3542,9 @@ static unsigned long __init hugetlb_gigantic_pages_alloc_boot(struct hstate *h)\n \t\tcond_resched();\n \t}\n \n+\tfor_each_node(nid)\n+\t\ti -= hugetlb_free_cross_zone_pages(h, nid);\n+\n \treturn i;\n }\n \n", "prefixes": [ "15/49" ] }