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45 lines
1.1 KiB
45 lines
1.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Free some vmemmap pages of HugeTLB |
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* |
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* Copyright (c) 2020, Bytedance. All rights reserved. |
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* |
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* Author: Muchun Song <[email protected]> |
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*/ |
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#ifndef _LINUX_HUGETLB_VMEMMAP_H |
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#define _LINUX_HUGETLB_VMEMMAP_H |
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#include <linux/hugetlb.h> |
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#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP |
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int alloc_huge_page_vmemmap(struct hstate *h, struct page *head); |
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void free_huge_page_vmemmap(struct hstate *h, struct page *head); |
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void hugetlb_vmemmap_init(struct hstate *h); |
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/* |
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* How many vmemmap pages associated with a HugeTLB page that can be freed |
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* to the buddy allocator. |
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*/ |
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static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h) |
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{ |
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return h->nr_free_vmemmap_pages; |
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} |
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#else |
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static inline int alloc_huge_page_vmemmap(struct hstate *h, struct page *head) |
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{ |
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return 0; |
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} |
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static inline void free_huge_page_vmemmap(struct hstate *h, struct page *head) |
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{ |
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} |
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static inline void hugetlb_vmemmap_init(struct hstate *h) |
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{ |
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} |
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static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h) |
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{ |
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return 0; |
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} |
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#endif /* CONFIG_HUGETLB_PAGE_FREE_VMEMMAP */ |
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#endif /* _LINUX_HUGETLB_VMEMMAP_H */
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