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dff033818a
It it inconvenient to mention the feature of optimizing vmemmap pages associated with HugeTLB pages when communicating with others since there is no specific or abbreviated name for it when it is first introduced. Let us give it a name HVO (HugeTLB Vmemmap Optimization) from now. This commit also updates the document about "hugetlb_free_vmemmap" by the way discussed in thread [1]. Link: https://lore.kernel.org/all/21aae898-d54d-cc4b-a11f-1bb7fddcfffa@redhat.com/ [1] Link: https://lkml.kernel.org/r/20220628092235.91270-4-songmuchun@bytedance.com Signed-off-by: Muchun Song <songmuchun@bytedance.com> Reviewed-by: Oscar Salvador <osalvador@suse.de> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: David Hildenbrand <david@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Will Deacon <will@kernel.org> Cc: Xiongchun Duan <duanxiongchun@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
45 lines
1.1 KiB
C
45 lines
1.1 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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#ifdef CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
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int hugetlb_vmemmap_alloc(struct hstate *h, struct page *head);
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void hugetlb_vmemmap_free(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
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* optimized and freed to the buddy allocator.
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*/
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static inline unsigned int hugetlb_optimize_vmemmap_pages(struct hstate *h)
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{
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return h->optimize_vmemmap_pages;
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}
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#else
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static inline int hugetlb_vmemmap_alloc(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_free(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 hugetlb_optimize_vmemmap_pages(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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#endif /* _LINUX_HUGETLB_VMEMMAP_H */
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