69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
#ifndef _LINUX_MIGRATE_H
|
|
#define _LINUX_MIGRATE_H
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/mempolicy.h>
|
|
#include <linux/pagemap.h>
|
|
|
|
typedef struct page *new_page_t(struct page *, unsigned long private, int **);
|
|
|
|
#ifdef CONFIG_MIGRATION
|
|
/* Check if a vma is migratable */
|
|
static inline int vma_migratable(struct vm_area_struct *vma)
|
|
{
|
|
if (vma->vm_flags & (VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED))
|
|
return 0;
|
|
/*
|
|
* Migration allocates pages in the highest zone. If we cannot
|
|
* do so then migration (at least from node to node) is not
|
|
* possible.
|
|
*/
|
|
if (vma->vm_file &&
|
|
gfp_zone(mapping_gfp_mask(vma->vm_file->f_mapping))
|
|
< policy_zone)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
extern int isolate_lru_page(struct page *p, struct list_head *pagelist);
|
|
extern int putback_lru_pages(struct list_head *l);
|
|
extern int migrate_page(struct address_space *,
|
|
struct page *, struct page *);
|
|
extern int migrate_pages(struct list_head *l, new_page_t x, unsigned long);
|
|
|
|
extern int fail_migrate_page(struct address_space *,
|
|
struct page *, struct page *);
|
|
|
|
extern int migrate_prep(void);
|
|
extern int migrate_vmas(struct mm_struct *mm,
|
|
const nodemask_t *from, const nodemask_t *to,
|
|
unsigned long flags);
|
|
#else
|
|
static inline int vma_migratable(struct vm_area_struct *vma)
|
|
{ return 0; }
|
|
|
|
static inline int isolate_lru_page(struct page *p, struct list_head *list)
|
|
{ return -ENOSYS; }
|
|
static inline int putback_lru_pages(struct list_head *l) { return 0; }
|
|
static inline int migrate_pages(struct list_head *l, new_page_t x,
|
|
unsigned long private) { return -ENOSYS; }
|
|
|
|
static inline int migrate_pages_to(struct list_head *pagelist,
|
|
struct vm_area_struct *vma, int dest) { return 0; }
|
|
|
|
static inline int migrate_prep(void) { return -ENOSYS; }
|
|
|
|
static inline int migrate_vmas(struct mm_struct *mm,
|
|
const nodemask_t *from, const nodemask_t *to,
|
|
unsigned long flags)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
/* Possible settings for the migrate_page() method in address_operations */
|
|
#define migrate_page NULL
|
|
#define fail_migrate_page NULL
|
|
|
|
#endif /* CONFIG_MIGRATION */
|
|
#endif /* _LINUX_MIGRATE_H */
|