mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 15:26:42 +07:00
9f32624be9
Now, we have an infrastructure in rmap_walk() to handle difference from variants of rmap traversing functions. So, just use it in page_referenced(). In this patch, I change following things. 1. remove some variants of rmap traversing functions. cf> page_referenced_ksm, page_referenced_anon, page_referenced_file 2. introduce new struct page_referenced_arg and pass it to page_referenced_one(), main function of rmap_walk, in order to count reference, to store vm_flags and to check finish condition. 3. mechanical change to use rmap_walk() in page_referenced(). [liwanp@linux.vnet.ibm.com: fix BUG at rmap_walk] Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Hugh Dickins <hughd@google.com> Cc: Rik van Riel <riel@redhat.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Hillf Danton <dhillf@gmail.com> Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com> Cc: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
#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>
|
|
|
|
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;
|
|
}
|
|
|
|
static inline void ksm_exit(struct mm_struct *mm)
|
|
{
|
|
if (test_bit(MMF_VM_MERGEABLE, &mm->flags))
|
|
__ksm_exit(mm);
|
|
}
|
|
|
|
/*
|
|
* A KSM page is one of those write-protected "shared pages" or "merged pages"
|
|
* which KSM maps into multiple mms, wherever identical anonymous page content
|
|
* is found in VM_MERGEABLE vmas. It's a PageAnon page, pointing not to any
|
|
* anon_vma, but to that page's node of the stable tree.
|
|
*/
|
|
static inline int PageKsm(struct page *page)
|
|
{
|
|
return ((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) ==
|
|
(PAGE_MAPPING_ANON | PAGE_MAPPING_KSM);
|
|
}
|
|
|
|
static inline struct stable_node *page_stable_node(struct page *page)
|
|
{
|
|
return PageKsm(page) ? page_rmapping(page) : NULL;
|
|
}
|
|
|
|
static inline void set_page_stable_node(struct page *page,
|
|
struct stable_node *stable_node)
|
|
{
|
|
page->mapping = (void *)stable_node +
|
|
(PAGE_MAPPING_ANON | PAGE_MAPPING_KSM);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
int 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;
|
|
}
|
|
|
|
static inline void ksm_exit(struct mm_struct *mm)
|
|
{
|
|
}
|
|
|
|
static inline int PageKsm(struct page *page)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#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;
|
|
}
|
|
|
|
static inline struct page *ksm_might_need_to_copy(struct page *page,
|
|
struct vm_area_struct *vma, unsigned long address)
|
|
{
|
|
return page;
|
|
}
|
|
|
|
static inline int page_referenced_ksm(struct page *page,
|
|
struct mem_cgroup *memcg, unsigned long *vm_flags)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int rmap_walk_ksm(struct page *page,
|
|
struct rmap_walk_control *rwc)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void ksm_migrate_page(struct page *newpage, struct page *oldpage)
|
|
{
|
|
}
|
|
#endif /* CONFIG_MMU */
|
|
#endif /* !CONFIG_KSM */
|
|
|
|
#endif /* __LINUX_KSM_H */
|