migrate.c (3fe2011ff51e92500010a495df4be86745fbbda9) migrate.c (748446bb6b5a9390b546af38ec899c868a9dbcf0)
1/*
2 * Memory Migration functionality - linux/mm/migration.c
3 *
4 * Copyright (C) 2006 Silicon Graphics, Inc., Christoph Lameter
5 *
6 * Page migration was first developed in the context of the memory hotplug
7 * project. The main authors of the migration code are:
8 *

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35#include <linux/gfp.h>
36
37#include "internal.h"
38
39#define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))
40
41/*
42 * migrate_prep() needs to be called before we start compiling a list of pages
1/*
2 * Memory Migration functionality - linux/mm/migration.c
3 *
4 * Copyright (C) 2006 Silicon Graphics, Inc., Christoph Lameter
5 *
6 * Page migration was first developed in the context of the memory hotplug
7 * project. The main authors of the migration code are:
8 *

--- 26 unchanged lines hidden (view full) ---

35#include <linux/gfp.h>
36
37#include "internal.h"
38
39#define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))
40
41/*
42 * migrate_prep() needs to be called before we start compiling a list of pages
43 * to be migrated using isolate_lru_page().
43 * to be migrated using isolate_lru_page(). If scheduling work on other CPUs is
44 * undesirable, use migrate_prep_local()
44 */
45int migrate_prep(void)
46{
47 /*
48 * Clear the LRU lists so pages can be isolated.
49 * Note that pages may be moved off the LRU after we have
50 * drained them. Those pages will fail to migrate like other
51 * pages that may be busy.
52 */
53 lru_add_drain_all();
54
55 return 0;
56}
57
45 */
46int migrate_prep(void)
47{
48 /*
49 * Clear the LRU lists so pages can be isolated.
50 * Note that pages may be moved off the LRU after we have
51 * drained them. Those pages will fail to migrate like other
52 * pages that may be busy.
53 */
54 lru_add_drain_all();
55
56 return 0;
57}
58
59/* Do the necessary work of migrate_prep but not if it involves other CPUs */
60int migrate_prep_local(void)
61{
62 lru_add_drain();
63
64 return 0;
65}
66
58/*
59 * Add isolated pages on the list back to the LRU under page lock
60 * to avoid leaking evictable pages back onto unevictable list.
61 */
62void putback_lru_pages(struct list_head *l)
63{
64 struct page *page;
65 struct page *page2;

--- 1084 unchanged lines hidden --- 		67/*
68 * Add isolated pages on the list back to the LRU under page lock
69 * to avoid leaking evictable pages back onto unevictable list.
70 */
71void putback_lru_pages(struct list_head *l)
72{
73 struct page *page;
74 struct page *page2;

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