Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
99 lines
2.8 KiB
C
99 lines
2.8 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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#include <linux/io.h>
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#include <linux/memblock.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/mm/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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void hugetlb_vmemmap_optimize_bootmem_folios(struct hstate *h, struct list_head *folio_list);
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#ifdef CONFIG_SPARSEMEM_VMEMMAP_PREINIT
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void hugetlb_vmemmap_init_early(int nid);
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void hugetlb_vmemmap_init_late(int nid);
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#endif
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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 inline 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 void hugetlb_vmemmap_optimize_bootmem_folios(struct hstate *h,
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struct list_head *folio_list)
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{
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}
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static inline void hugetlb_vmemmap_init_early(int nid)
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{
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}
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static inline void hugetlb_vmemmap_init_late(int nid)
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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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