mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 16:24:13 +08:00
e5b16c8628
The directory this file is in was renamed but the reference didn't get
updated. Fix it.
Link: https://lkml.kernel.org/r/20231022185619.919397-1-vegard.nossum@oracle.com
Fixes: ee65728e10 ("docs: rename Documentation/vm to Documentation/mm")
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Rik van Riel <riel@surriel.com>
Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Wu XiangCheng <bobwxc@email.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* HugeTLB Vmemmap Optimization (HVO)
|
|
*
|
|
* Copyright (c) 2020, ByteDance. All rights reserved.
|
|
*
|
|
* Author: Muchun Song <songmuchun@bytedance.com>
|
|
*/
|
|
#ifndef _LINUX_HUGETLB_VMEMMAP_H
|
|
#define _LINUX_HUGETLB_VMEMMAP_H
|
|
#include <linux/hugetlb.h>
|
|
|
|
/*
|
|
* Reserve one vmemmap page, all vmemmap addresses are mapped to it. See
|
|
* Documentation/mm/vmemmap_dedup.rst.
|
|
*/
|
|
#define HUGETLB_VMEMMAP_RESERVE_SIZE PAGE_SIZE
|
|
#define HUGETLB_VMEMMAP_RESERVE_PAGES (HUGETLB_VMEMMAP_RESERVE_SIZE / sizeof(struct page))
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
|
|
int hugetlb_vmemmap_restore_folio(const struct hstate *h, struct folio *folio);
|
|
long hugetlb_vmemmap_restore_folios(const struct hstate *h,
|
|
struct list_head *folio_list,
|
|
struct list_head *non_hvo_folios);
|
|
void hugetlb_vmemmap_optimize_folio(const struct hstate *h, struct folio *folio);
|
|
void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_list);
|
|
|
|
static inline unsigned int hugetlb_vmemmap_size(const struct hstate *h)
|
|
{
|
|
return pages_per_huge_page(h) * sizeof(struct page);
|
|
}
|
|
|
|
/*
|
|
* Return how many vmemmap size associated with a HugeTLB page that can be
|
|
* optimized and can be freed to the buddy allocator.
|
|
*/
|
|
static inline unsigned int hugetlb_vmemmap_optimizable_size(const struct hstate *h)
|
|
{
|
|
int size = hugetlb_vmemmap_size(h) - HUGETLB_VMEMMAP_RESERVE_SIZE;
|
|
|
|
if (!is_power_of_2(sizeof(struct page)))
|
|
return 0;
|
|
return size > 0 ? size : 0;
|
|
}
|
|
#else
|
|
static inline int hugetlb_vmemmap_restore_folio(const struct hstate *h, struct folio *folio)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static long hugetlb_vmemmap_restore_folios(const struct hstate *h,
|
|
struct list_head *folio_list,
|
|
struct list_head *non_hvo_folios)
|
|
{
|
|
list_splice_init(folio_list, non_hvo_folios);
|
|
return 0;
|
|
}
|
|
|
|
static inline void hugetlb_vmemmap_optimize_folio(const struct hstate *h, struct folio *folio)
|
|
{
|
|
}
|
|
|
|
static inline void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_list)
|
|
{
|
|
}
|
|
|
|
static inline unsigned int hugetlb_vmemmap_optimizable_size(const struct hstate *h)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP */
|
|
|
|
static inline bool hugetlb_vmemmap_optimizable(const struct hstate *h)
|
|
{
|
|
return hugetlb_vmemmap_optimizable_size(h) != 0;
|
|
}
|
|
#endif /* _LINUX_HUGETLB_VMEMMAP_H */
|