mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
5733c7d11d
The PATCH "mm: introduce compaction and migration for virtio ballooned pages" hacks around putback_lru_pages() in order to allow ballooned pages to be re-inserted on balloon page list as if a ballooned page was like a LRU page. As ballooned pages are not legitimate LRU pages, this patch introduces putback_movable_pages() to properly cope with cases where the isolated pageset contains ballooned pages and LRU pages, thus fixing the mentioned inelegant hack around putback_lru_pages(). Signed-off-by: Rafael Aquini <aquini@redhat.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Andi Kleen <andi@firstfloor.org> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
87 lines
3.0 KiB
C
87 lines
3.0 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.
|
|
*/
|
|
|
|
#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, bool offlining,
|
|
enum migrate_mode mode);
|
|
extern int migrate_huge_page(struct page *, new_page_t x,
|
|
unsigned long private, bool offlining,
|
|
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, bool offlining,
|
|
enum migrate_mode mode) { return -ENOSYS; }
|
|
static inline int migrate_huge_page(struct page *page, new_page_t x,
|
|
unsigned long private, bool offlining,
|
|
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 */
|
|
#endif /* _LINUX_MIGRATE_H */
|