Release 4.12 include/linux/ksm.h
#ifndef __LINUX_KSM_H
#define __LINUX_KSM_H
/*
* Memory merging support.
*
* This code enables dynamic sharing of identical pages found in different
* memory areas, even if they are not shared by fork().
*/
#include <linux/bitops.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/rmap.h>
#include <linux/sched.h>
#include <linux/sched/coredump.h>
struct stable_node;
struct mem_cgroup;
#ifdef CONFIG_KSM
int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
unsigned long end, int advice, unsigned long *vm_flags);
int __ksm_enter(struct mm_struct *mm);
void __ksm_exit(struct mm_struct *mm);
static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm)
{
if (test_bit(MMF_VM_MERGEABLE, &oldmm->flags))
return __ksm_enter(mm);
return 0;
}
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static inline void ksm_exit(struct mm_struct *mm)
{
if (test_bit(MMF_VM_MERGEABLE, &mm->flags))
__ksm_exit(mm);
}
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static inline struct stable_node *page_stable_node(struct page *page)
{
return PageKsm(page) ? page_rmapping(page) : NULL;
}
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static inline void set_page_stable_node(struct page *page,
struct stable_node *stable_node)
{
page->mapping = (void *)((unsigned long)stable_node | PAGE_MAPPING_KSM);
}
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| Hugh Dickins | 30 | 85.71% | 3 | 75.00% |
| MinChan Kim | 5 | 14.29% | 1 | 25.00% |
| Total | 35 | 100.00% | 4 | 100.00% |
/*
* When do_swap_page() first faults in from swap what used to be a KSM page,
* no problem, it will be assigned to this vma's anon_vma; but thereafter,
* it might be faulted into a different anon_vma (or perhaps to a different
* offset in the same anon_vma). do_swap_page() cannot do all the locking
* needed to reconstitute a cross-anon_vma KSM page: for now it has to make
* a copy, and leave remerging the pages to a later pass of ksmd.
*
* We'd like to make this conditional on vma->vm_flags & VM_MERGEABLE,
* but what if the vma was unmerged while the page was swapped out?
*/
struct page *ksm_might_need_to_copy(struct page *page,
struct vm_area_struct *vma, unsigned long address);
void rmap_walk_ksm(struct page *page, struct rmap_walk_control *rwc);
void ksm_migrate_page(struct page *newpage, struct page *oldpage);
#else /* !CONFIG_KSM */
static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm)
{
return 0;
}
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| Total | 20 | 100.00% | 1 | 100.00% |
static inline void ksm_exit(struct mm_struct *mm)
{
}
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#ifdef CONFIG_MMU
static inline int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
unsigned long end, int advice, unsigned long *vm_flags)
{
return 0;
}
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| Hugh Dickins | 31 | 100.00% | 1 | 100.00% |
| Total | 31 | 100.00% | 1 | 100.00% |
static inline struct page *ksm_might_need_to_copy(struct page *page,
struct vm_area_struct *vma, unsigned long address)
{
return page;
}
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| Hugh Dickins | 26 | 100.00% | 2 | 100.00% |
| Total | 26 | 100.00% | 2 | 100.00% |
static inline int page_referenced_ksm(struct page *page,
struct mem_cgroup *memcg, unsigned long *vm_flags)
{
return 0;
}
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| Hugh Dickins | 25 | 100.00% | 1 | 100.00% |
| Total | 25 | 100.00% | 1 | 100.00% |
static inline void rmap_walk_ksm(struct page *page,
struct rmap_walk_control *rwc)
{
}
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| Hugh Dickins | 12 | 75.00% | 1 | 33.33% |
| JoonSoo Kim | 2 | 12.50% | 1 | 33.33% |
| MinChan Kim | 2 | 12.50% | 1 | 33.33% |
| Total | 16 | 100.00% | 3 | 100.00% |
static inline void ksm_migrate_page(struct page *newpage, struct page *oldpage)
{
}
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| Hugh Dickins | 16 | 100.00% | 1 | 100.00% |
| Total | 16 | 100.00% | 1 | 100.00% |
#endif /* CONFIG_MMU */
#endif /* !CONFIG_KSM */
#endif /* __LINUX_KSM_H */
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| Hugh Dickins | 400 | 96.39% | 8 | 66.67% |
| MinChan Kim | 8 | 1.93% | 2 | 16.67% |
| JoonSoo Kim | 4 | 0.96% | 1 | 8.33% |
| Ingo Molnar | 3 | 0.72% | 1 | 8.33% |
| Total | 415 | 100.00% | 12 | 100.00% |
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