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Muchun Song
774905878f
All the infrastructure is ready, so we introduce nr_free_vmemmap_pages field in the hstate to indicate how many vmemmap pages associated with a HugeTLB page that can be freed to buddy allocator. And initialize it in the hugetlb_vmemmap_init(). This patch is actual enablement of the feature. There are only (RESERVE_VMEMMAP_SIZE / sizeof(struct page)) struct page structs that can be used when CONFIG_HUGETLB_PAGE_FREE_VMEMMAP, so add a BUILD_BUG_ON to catch invalid usage of the tail struct page. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Muchun Song <[email protected]> Acked-by: Mike Kravetz <[email protected]> Reviewed-by: Oscar Salvador <[email protected]> Reviewed-by: Miaohe Lin <[email protected]> Tested-by: Chen Huang <[email protected]> Tested-by: Bodeddula Balasubramaniam <[email protected]> Cc: Alexander Viro <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Anshuman Khandual <[email protected]> Cc: Balbir Singh <[email protected]> Cc: Barry Song <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Dave Hansen <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: David Rientjes <[email protected]> Cc: HORIGUCHI NAOYA <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Joao Martins <[email protected]> Cc: Joerg Roedel <[email protected]> Cc: Jonathan Corbet <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Mina Almasry <[email protected]> Cc: Oliver Neukum <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Pawan Gupta <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Randy Dunlap <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Xiongchun Duan <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
// 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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