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And initialize it in the hugetlb_vmemmap_init(). This patch is actual enablement of the feature. Signed-off-by: Muchun Song Acked-by: Mike Kravetz Reviewed-by: Oscar Salvador --- include/linux/hugetlb.h | 3 +++ mm/hugetlb.c | 1 + mm/hugetlb_vmemmap.c | 30 ++++++++++++++++++++++++++---- mm/hugetlb_vmemmap.h | 5 +++++ 4 files changed, 35 insertions(+), 4 deletions(-) diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index ad249e56ac49..775aea53669a 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -560,6 +560,9 @@ struct hstate { unsigned int nr_huge_pages_node[MAX_NUMNODES]; unsigned int free_huge_pages_node[MAX_NUMNODES]; unsigned int surplus_huge_pages_node[MAX_NUMNODES]; +#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP + unsigned int nr_free_vmemmap_pages; +#endif #ifdef CONFIG_CGROUP_HUGETLB /* cgroup control files */ struct cftype cgroup_files_dfl[7]; diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 5518283aa667..04dde2b71f3e 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3220,6 +3220,7 @@ void __init hugetlb_add_hstate(unsigned int order) h->next_nid_to_free =3D first_memory_node; snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB", huge_page_size(h)/1024); + hugetlb_vmemmap_init(h); =20 parsed_hstate =3D h; } diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c index 224a3cb69bf9..36ebd677e606 100644 --- a/mm/hugetlb_vmemmap.c +++ b/mm/hugetlb_vmemmap.c @@ -208,13 +208,10 @@ early_param("hugetlb_free_vmemmap", early_hugetlb_f= ree_vmemmap_param); /* * How many vmemmap pages associated with a HugeTLB page that can be fre= ed * to the buddy allocator. - * - * Todo: Returns zero for now, which means the feature is disabled. We w= ill - * enable it once all the infrastructure is there. */ static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h= ) { - return 0; + return h->nr_free_vmemmap_pages; } =20 static inline unsigned long free_vmemmap_pages_size_per_hpage(struct hst= ate *h) @@ -269,3 +266,28 @@ void free_huge_page_vmemmap(struct hstate *h, struct= page *head) */ vmemmap_remap_free(vmemmap_addr, vmemmap_end, vmemmap_reuse); } + +void __init hugetlb_vmemmap_init(struct hstate *h) +{ + unsigned int nr_pages =3D pages_per_huge_page(h); + unsigned int vmemmap_pages; + + if (!hugetlb_free_vmemmap_enabled) + return; + + vmemmap_pages =3D (nr_pages * sizeof(struct page)) >> PAGE_SHIFT; + /* + * The head page and the first tail page are not to be freed to buddy + * allocator, the other pages will map to the first tail page, so they + * can be freed. + * + * Could RESERVE_VMEMMAP_NR be greater than @vmemmap_pages? It is true + * on some architectures (e.g. aarch64). See Documentation/arm64/ + * hugetlbpage.rst for more details. + */ + if (likely(vmemmap_pages > RESERVE_VMEMMAP_NR)) + h->nr_free_vmemmap_pages =3D vmemmap_pages - RESERVE_VMEMMAP_NR; + + pr_info("can free %d vmemmap pages for %s\n", h->nr_free_vmemmap_pages, + h->name); +} diff --git a/mm/hugetlb_vmemmap.h b/mm/hugetlb_vmemmap.h index 6f89a9eed02c..02a21604ef1d 100644 --- a/mm/hugetlb_vmemmap.h +++ b/mm/hugetlb_vmemmap.h @@ -14,6 +14,7 @@ int alloc_huge_page_vmemmap(struct hstate *h, struct page *head, gfp_t gfp_mask); void free_huge_page_vmemmap(struct hstate *h, struct page *head); +void hugetlb_vmemmap_init(struct hstate *h); #else static inline int alloc_huge_page_vmemmap(struct hstate *h, struct page = *head, gfp_t gfp_mask) @@ -24,5 +25,9 @@ static inline int alloc_huge_page_vmemmap(struct hstate= *h, struct page *head, static inline void free_huge_page_vmemmap(struct hstate *h, struct page = *head) { } + +static inline void hugetlb_vmemmap_init(struct hstate *h) +{ +} #endif /* CONFIG_HUGETLB_PAGE_FREE_VMEMMAP */ #endif /* _LINUX_HUGETLB_VMEMMAP_H */ --=20 2.11.0