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KAMEZAWA Hiroyuki95144c72006-03-27 01:16:02 -08001/*
2 * linux/mm/mmzone.c
3 *
Mel Gorman4468b8f2013-02-22 16:34:46 -08004 * management codes for pgdats, zones and page flags
KAMEZAWA Hiroyuki95144c72006-03-27 01:16:02 -08005 */
6
7
KAMEZAWA Hiroyuki95144c72006-03-27 01:16:02 -08008#include <linux/stddef.h>
Mel Gormaneb335752009-05-13 17:34:48 +01009#include <linux/mm.h>
KAMEZAWA Hiroyuki95144c72006-03-27 01:16:02 -080010#include <linux/mmzone.h>
KAMEZAWA Hiroyuki95144c72006-03-27 01:16:02 -080011
12struct pglist_data *first_online_pgdat(void)
13{
14 return NODE_DATA(first_online_node);
15}
16
KAMEZAWA Hiroyuki95144c72006-03-27 01:16:02 -080017struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
18{
19 int nid = next_online_node(pgdat->node_id);
20
21 if (nid == MAX_NUMNODES)
22 return NULL;
23 return NODE_DATA(nid);
24}
KAMEZAWA Hiroyuki95144c72006-03-27 01:16:02 -080025
26/*
27 * next_zone - helper magic for for_each_zone()
28 */
29struct zone *next_zone(struct zone *zone)
30{
31 pg_data_t *pgdat = zone->zone_pgdat;
32
33 if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
34 zone++;
35 else {
36 pgdat = next_online_pgdat(pgdat);
37 if (pgdat)
38 zone = pgdat->node_zones;
39 else
40 zone = NULL;
41 }
42 return zone;
43}
KAMEZAWA Hiroyuki95144c72006-03-27 01:16:02 -080044
Mel Gorman19770b32008-04-28 02:12:18 -070045static inline int zref_in_nodemask(struct zoneref *zref, nodemask_t *nodes)
46{
47#ifdef CONFIG_NUMA
48 return node_isset(zonelist_node_idx(zref), *nodes);
49#else
50 return 1;
51#endif /* CONFIG_NUMA */
52}
53
54/* Returns the next zone at or below highest_zoneidx in a zonelist */
Mel Gorman682a3382016-05-19 17:13:30 -070055struct zoneref *__next_zones_zonelist(struct zoneref *z,
Mel Gorman19770b32008-04-28 02:12:18 -070056 enum zone_type highest_zoneidx,
Vlastimil Babka05891fb2015-02-11 15:25:47 -080057 nodemask_t *nodes)
Mel Gorman19770b32008-04-28 02:12:18 -070058{
59 /*
60 * Find the next suitable zone to use for the allocation.
61 * Only filter based on nodemask if it's set
62 */
Steven Rostedte57b9d82017-02-22 15:44:47 -080063 if (unlikely(nodes == NULL))
Mel Gorman19770b32008-04-28 02:12:18 -070064 while (zonelist_zone_idx(z) > highest_zoneidx)
65 z++;
66 else
67 while (zonelist_zone_idx(z) > highest_zoneidx ||
68 (z->zone && !zref_in_nodemask(z, nodes)))
69 z++;
70
Mel Gorman19770b32008-04-28 02:12:18 -070071 return z;
72}
Mel Gormaneb335752009-05-13 17:34:48 +010073
74#ifdef CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
Yaowei Bai5b802872016-01-14 15:19:11 -080075bool memmap_valid_within(unsigned long pfn,
Mel Gormaneb335752009-05-13 17:34:48 +010076 struct page *page, struct zone *zone)
77{
78 if (page_to_pfn(page) != pfn)
Yaowei Bai5b802872016-01-14 15:19:11 -080079 return false;
Mel Gormaneb335752009-05-13 17:34:48 +010080
81 if (page_zone(page) != zone)
Yaowei Bai5b802872016-01-14 15:19:11 -080082 return false;
Mel Gormaneb335752009-05-13 17:34:48 +010083
Yaowei Bai5b802872016-01-14 15:19:11 -080084 return true;
Mel Gormaneb335752009-05-13 17:34:48 +010085}
86#endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */
Konstantin Khlebnikov7f5e86c2012-05-29 15:06:58 -070087
Hugh Dickinsbea8c152012-11-16 14:14:54 -080088void lruvec_init(struct lruvec *lruvec)
Konstantin Khlebnikov7f5e86c2012-05-29 15:06:58 -070089{
90 enum lru_list lru;
91
92 memset(lruvec, 0, sizeof(struct lruvec));
93
94 for_each_lru(lru)
95 INIT_LIST_HEAD(&lruvec->lists[lru]);
Konstantin Khlebnikov7f5e86c2012-05-29 15:06:58 -070096}
Mel Gorman4468b8f2013-02-22 16:34:46 -080097
Peter Zijlstra90572892013-10-07 11:29:20 +010098#if defined(CONFIG_NUMA_BALANCING) && !defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS)
99int page_cpupid_xchg_last(struct page *page, int cpupid)
Mel Gorman4468b8f2013-02-22 16:34:46 -0800100{
101 unsigned long old_flags, flags;
Peter Zijlstra90572892013-10-07 11:29:20 +0100102 int last_cpupid;
Mel Gorman4468b8f2013-02-22 16:34:46 -0800103
104 do {
105 old_flags = flags = page->flags;
Peter Zijlstra90572892013-10-07 11:29:20 +0100106 last_cpupid = page_cpupid_last(page);
Mel Gorman4468b8f2013-02-22 16:34:46 -0800107
Peter Zijlstra90572892013-10-07 11:29:20 +0100108 flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
109 flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
Mel Gorman4468b8f2013-02-22 16:34:46 -0800110 } while (unlikely(cmpxchg(&page->flags, old_flags, flags) != old_flags));
111
Peter Zijlstra90572892013-10-07 11:29:20 +0100112 return last_cpupid;
Mel Gorman4468b8f2013-02-22 16:34:46 -0800113}
114#endif