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60 lines
1.6 KiB
60 lines
1.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* HugeTLB Vmemmap Optimization (HVO) |
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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_OPTIMIZE_VMEMMAP |
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int hugetlb_vmemmap_restore(const struct hstate *h, struct page *head); |
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void hugetlb_vmemmap_optimize(const struct hstate *h, struct page *head); |
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/* |
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* Reserve one vmemmap page, all vmemmap addresses are mapped to it. See |
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* Documentation/vm/vmemmap_dedup.rst. |
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*/ |
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#define HUGETLB_VMEMMAP_RESERVE_SIZE PAGE_SIZE |
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static inline unsigned int hugetlb_vmemmap_size(const struct hstate *h) |
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{ |
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return pages_per_huge_page(h) * sizeof(struct page); |
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} |
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/* |
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* Return how many vmemmap size associated with a HugeTLB page that can be |
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* optimized and can be freed to the buddy allocator. |
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*/ |
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static inline unsigned int hugetlb_vmemmap_optimizable_size(const struct hstate *h) |
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{ |
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int size = hugetlb_vmemmap_size(h) - HUGETLB_VMEMMAP_RESERVE_SIZE; |
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if (!is_power_of_2(sizeof(struct page))) |
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return 0; |
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return size > 0 ? size : 0; |
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} |
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#else |
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static inline int hugetlb_vmemmap_restore(const 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 hugetlb_vmemmap_optimize(const struct hstate *h, struct page *head) |
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{ |
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} |
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static inline unsigned int hugetlb_vmemmap_optimizable_size(const 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_OPTIMIZE_VMEMMAP */ |
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static inline bool hugetlb_vmemmap_optimizable(const struct hstate *h) |
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{ |
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return hugetlb_vmemmap_optimizable_size(h) != 0; |
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} |
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#endif /* _LINUX_HUGETLB_VMEMMAP_H */
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