mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-26 22:24:09 +08:00
9c620e2bc5
No functional change, but the only purpose of the offlining argument to migrate_pages() etc, was to ensure that __unmap_and_move() could migrate a KSM page for memory hotremove (which took ksm_thread_mutex) but not for other callers. Now all cases are safe, remove the arg. Signed-off-by: Hugh Dickins <hughd@google.com> Cc: Rik van Riel <riel@redhat.com> Cc: Petr Holasek <pholasek@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Izik Eidus <izik.eidus@ravellosystems.com> Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com> Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
127 lines
4.1 KiB
C
127 lines
4.1 KiB
C
#ifndef _LINUX_MIGRATE_H
|
|
#define _LINUX_MIGRATE_H
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/mempolicy.h>
|
|
#include <linux/migrate_mode.h>
|
|
|
|
typedef struct page *new_page_t(struct page *, unsigned long private, int **);
|
|
|
|
/*
|
|
* Return values from addresss_space_operations.migratepage():
|
|
* - negative errno on page migration failure;
|
|
* - zero on page migration success;
|
|
*
|
|
* The balloon page migration introduces this special case where a 'distinct'
|
|
* return code is used to flag a successful page migration to unmap_and_move().
|
|
* This approach is necessary because page migration can race against balloon
|
|
* deflation procedure, and for such case we could introduce a nasty page leak
|
|
* if a successfully migrated balloon page gets released concurrently with
|
|
* migration's unmap_and_move() wrap-up steps.
|
|
*/
|
|
#define MIGRATEPAGE_SUCCESS 0
|
|
#define MIGRATEPAGE_BALLOON_SUCCESS 1 /* special ret code for balloon page
|
|
* sucessful migration case.
|
|
*/
|
|
enum migrate_reason {
|
|
MR_COMPACTION,
|
|
MR_MEMORY_FAILURE,
|
|
MR_MEMORY_HOTPLUG,
|
|
MR_SYSCALL, /* also applies to cpusets */
|
|
MR_MEMPOLICY_MBIND,
|
|
MR_NUMA_MISPLACED,
|
|
MR_CMA
|
|
};
|
|
|
|
#ifdef CONFIG_MIGRATION
|
|
|
|
extern void putback_lru_pages(struct list_head *l);
|
|
extern void putback_movable_pages(struct list_head *l);
|
|
extern int migrate_page(struct address_space *,
|
|
struct page *, struct page *, enum migrate_mode);
|
|
extern int migrate_pages(struct list_head *l, new_page_t x,
|
|
unsigned long private, enum migrate_mode mode, int reason);
|
|
extern int migrate_huge_page(struct page *, new_page_t x,
|
|
unsigned long private, enum migrate_mode mode);
|
|
|
|
extern int fail_migrate_page(struct address_space *,
|
|
struct page *, struct page *);
|
|
|
|
extern int migrate_prep(void);
|
|
extern int migrate_prep_local(void);
|
|
extern int migrate_vmas(struct mm_struct *mm,
|
|
const nodemask_t *from, const nodemask_t *to,
|
|
unsigned long flags);
|
|
extern void migrate_page_copy(struct page *newpage, struct page *page);
|
|
extern int migrate_huge_page_move_mapping(struct address_space *mapping,
|
|
struct page *newpage, struct page *page);
|
|
#else
|
|
|
|
static inline void putback_lru_pages(struct list_head *l) {}
|
|
static inline void putback_movable_pages(struct list_head *l) {}
|
|
static inline int migrate_pages(struct list_head *l, new_page_t x,
|
|
unsigned long private, enum migrate_mode mode, int reason)
|
|
{ return -ENOSYS; }
|
|
static inline int migrate_huge_page(struct page *page, new_page_t x,
|
|
unsigned long private, enum migrate_mode mode)
|
|
{ return -ENOSYS; }
|
|
|
|
static inline int migrate_prep(void) { return -ENOSYS; }
|
|
static inline int migrate_prep_local(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;
|
|
}
|
|
|
|
static inline void migrate_page_copy(struct page *newpage,
|
|
struct page *page) {}
|
|
|
|
static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
|
|
struct page *newpage, struct page *page)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
/* Possible settings for the migrate_page() method in address_operations */
|
|
#define migrate_page NULL
|
|
#define fail_migrate_page NULL
|
|
|
|
#endif /* CONFIG_MIGRATION */
|
|
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
extern int migrate_misplaced_page(struct page *page, int node);
|
|
extern int migrate_misplaced_page(struct page *page, int node);
|
|
extern bool migrate_ratelimited(int node);
|
|
#else
|
|
static inline int migrate_misplaced_page(struct page *page, int node)
|
|
{
|
|
return -EAGAIN; /* can't migrate now */
|
|
}
|
|
static inline bool migrate_ratelimited(int node)
|
|
{
|
|
return false;
|
|
}
|
|
#endif /* CONFIG_NUMA_BALANCING */
|
|
|
|
#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
|
|
extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
|
|
struct vm_area_struct *vma,
|
|
pmd_t *pmd, pmd_t entry,
|
|
unsigned long address,
|
|
struct page *page, int node);
|
|
#else
|
|
static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
|
|
struct vm_area_struct *vma,
|
|
pmd_t *pmd, pmd_t entry,
|
|
unsigned long address,
|
|
struct page *page, int node)
|
|
{
|
|
return -EAGAIN;
|
|
}
|
|
#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
|
|
|
|
#endif /* _LINUX_MIGRATE_H */
|