https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 58720809f52779dc0f08e53e54b014209d13eebb authored by Linus Torvalds on 15 October 2023, 20:34:39 UTC
Linux 6.6-rc6
Linux 6.6-rc6
Tip revision: 5872080
hugetlb_vmemmap.h
// 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>
#ifdef CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
int hugetlb_vmemmap_restore(const struct hstate *h, struct page *head);
void hugetlb_vmemmap_optimize(const struct hstate *h, struct page *head);
/*
* Reserve one vmemmap page, all vmemmap addresses are mapped to it. See
* Documentation/vm/vmemmap_dedup.rst.
*/
#define HUGETLB_VMEMMAP_RESERVE_SIZE PAGE_SIZE
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(const struct hstate *h, struct page *head)
{
return 0;
}
static inline void hugetlb_vmemmap_optimize(const struct hstate *h, struct page *head)
{
}
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 */