diff options
Diffstat (limited to 'mm/hugetlb_vmemmap.h')
| -rw-r--r-- | mm/hugetlb_vmemmap.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/mm/hugetlb_vmemmap.h b/mm/hugetlb_vmemmap.h new file mode 100644 index 000000000000..cb2bef8f9e73 --- /dev/null +++ b/mm/hugetlb_vmemmap.h @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Free some vmemmap pages of HugeTLB + * + * Copyright (c) 2020, Bytedance. All rights reserved. + * + * Author: Muchun Song <songmuchun@bytedance.com> + */ +#ifndef _LINUX_HUGETLB_VMEMMAP_H +#define _LINUX_HUGETLB_VMEMMAP_H +#include <linux/hugetlb.h> + +#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP +int alloc_huge_page_vmemmap(struct hstate *h, struct page *head); +void free_huge_page_vmemmap(struct hstate *h, struct page *head); +void hugetlb_vmemmap_init(struct hstate *h); + +/* + * How many vmemmap pages associated with a HugeTLB page that can be freed + * to the buddy allocator. + */ +static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h) +{ + return h->nr_free_vmemmap_pages; +} +#else +static inline int alloc_huge_page_vmemmap(struct hstate *h, struct page *head) +{ + return 0; +} + +static inline void free_huge_page_vmemmap(struct hstate *h, struct page *head) +{ +} + +static inline void hugetlb_vmemmap_init(struct hstate *h) +{ +} + +static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h) +{ + return 0; +} +#endif /* CONFIG_HUGETLB_PAGE_FREE_VMEMMAP */ +#endif /* _LINUX_HUGETLB_VMEMMAP_H */ |