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c5ad3233ea
Most function calls in hugetlb.c are made with folio arguments. This brings hugetlb_vmemmap calls inline with them by using folio instead of head struct page. Head struct page is still needed within these functions. The set/clear/test functions for hugepages are also changed to folio versions. Link: https://lkml.kernel.org/r/20231011144557.1720481-2-usama.arif@bytedance.com Signed-off-by: Usama Arif <usama.arif@bytedance.com> Reviewed-by: Muchun Song <songmuchun@bytedance.com> Cc: Fam Zheng <fam.zheng@bytedance.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Punit Agrawal <punit.agrawal@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
// 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 <songmuchun@bytedance.com>
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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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/*
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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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#define HUGETLB_VMEMMAP_RESERVE_PAGES (HUGETLB_VMEMMAP_RESERVE_SIZE / sizeof(struct page))
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#ifdef CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
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int hugetlb_vmemmap_restore_folio(const struct hstate *h, struct folio *folio);
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long hugetlb_vmemmap_restore_folios(const struct hstate *h,
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struct list_head *folio_list,
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struct list_head *non_hvo_folios);
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void hugetlb_vmemmap_optimize_folio(const struct hstate *h, struct folio *folio);
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void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_list);
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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_folio(const struct hstate *h, struct folio *folio)
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{
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return 0;
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}
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static long hugetlb_vmemmap_restore_folios(const struct hstate *h,
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struct list_head *folio_list,
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struct list_head *non_hvo_folios)
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{
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list_splice_init(folio_list, non_hvo_folios);
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return 0;
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}
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static inline void hugetlb_vmemmap_optimize_folio(const struct hstate *h, struct folio *folio)
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{
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}
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static inline void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_list)
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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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