]>
Commit | Line | Data |
---|---|---|
748446bb MG |
1 | #ifndef _LINUX_COMPACTION_H |
2 | #define _LINUX_COMPACTION_H | |
3 | ||
56de7263 | 4 | /* Return values for compact_zone() and try_to_compact_pages() */ |
53853e2d VB |
5 | /* compaction didn't start as it was deferred due to past failures */ |
6 | #define COMPACT_DEFERRED 0 | |
56de7263 | 7 | /* compaction didn't start as it was not possible or direct reclaim was more suitable */ |
53853e2d | 8 | #define COMPACT_SKIPPED 1 |
56de7263 | 9 | /* compaction should continue to another pageblock */ |
53853e2d | 10 | #define COMPACT_CONTINUE 2 |
56de7263 | 11 | /* direct compaction partially compacted a zone and there are suitable pages */ |
53853e2d | 12 | #define COMPACT_PARTIAL 3 |
56de7263 | 13 | /* The full zone was compacted */ |
53853e2d | 14 | #define COMPACT_COMPLETE 4 |
748446bb | 15 | |
76ab0f53 MG |
16 | #ifdef CONFIG_COMPACTION |
17 | extern int sysctl_compact_memory; | |
18 | extern int sysctl_compaction_handler(struct ctl_table *table, int write, | |
19 | void __user *buffer, size_t *length, loff_t *ppos); | |
5e771905 MG |
20 | extern int sysctl_extfrag_threshold; |
21 | extern int sysctl_extfrag_handler(struct ctl_table *table, int write, | |
22 | void __user *buffer, size_t *length, loff_t *ppos); | |
56de7263 MG |
23 | |
24 | extern int fragmentation_index(struct zone *zone, unsigned int order); | |
25 | extern unsigned long try_to_compact_pages(struct zonelist *zonelist, | |
77f1fe6b | 26 | int order, gfp_t gfp_mask, nodemask_t *mask, |
53853e2d VB |
27 | enum migrate_mode mode, bool *contended, |
28 | struct zone **candidate_zone); | |
7103f16d | 29 | extern void compact_pgdat(pg_data_t *pgdat, int order); |
62997027 | 30 | extern void reset_isolation_suitable(pg_data_t *pgdat); |
3e7d3449 | 31 | extern unsigned long compaction_suitable(struct zone *zone, int order); |
4f92e258 MG |
32 | |
33 | /* Do not skip compaction more than 64 times */ | |
34 | #define COMPACT_MAX_DEFER_SHIFT 6 | |
35 | ||
36 | /* | |
37 | * Compaction is deferred when compaction fails to result in a page | |
38 | * allocation success. 1 << compact_defer_limit compactions are skipped up | |
39 | * to a limit of 1 << COMPACT_MAX_DEFER_SHIFT | |
40 | */ | |
aff62249 | 41 | static inline void defer_compaction(struct zone *zone, int order) |
4f92e258 MG |
42 | { |
43 | zone->compact_considered = 0; | |
44 | zone->compact_defer_shift++; | |
45 | ||
aff62249 RR |
46 | if (order < zone->compact_order_failed) |
47 | zone->compact_order_failed = order; | |
48 | ||
4f92e258 MG |
49 | if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT) |
50 | zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT; | |
51 | } | |
52 | ||
53 | /* Returns true if compaction should be skipped this time */ | |
aff62249 | 54 | static inline bool compaction_deferred(struct zone *zone, int order) |
4f92e258 MG |
55 | { |
56 | unsigned long defer_limit = 1UL << zone->compact_defer_shift; | |
57 | ||
aff62249 RR |
58 | if (order < zone->compact_order_failed) |
59 | return false; | |
60 | ||
4f92e258 MG |
61 | /* Avoid possible overflow */ |
62 | if (++zone->compact_considered > defer_limit) | |
63 | zone->compact_considered = defer_limit; | |
64 | ||
c59e2610 | 65 | return zone->compact_considered < defer_limit; |
4f92e258 MG |
66 | } |
67 | ||
de6c60a6 VB |
68 | /* |
69 | * Update defer tracking counters after successful compaction of given order, | |
70 | * which means an allocation either succeeded (alloc_success == true) or is | |
71 | * expected to succeed. | |
72 | */ | |
73 | static inline void compaction_defer_reset(struct zone *zone, int order, | |
74 | bool alloc_success) | |
75 | { | |
76 | if (alloc_success) { | |
77 | zone->compact_considered = 0; | |
78 | zone->compact_defer_shift = 0; | |
79 | } | |
80 | if (order >= zone->compact_order_failed) | |
81 | zone->compact_order_failed = order + 1; | |
82 | } | |
83 | ||
62997027 MG |
84 | /* Returns true if restarting compaction after many failures */ |
85 | static inline bool compaction_restarting(struct zone *zone, int order) | |
86 | { | |
87 | if (order < zone->compact_order_failed) | |
88 | return false; | |
89 | ||
90 | return zone->compact_defer_shift == COMPACT_MAX_DEFER_SHIFT && | |
91 | zone->compact_considered >= 1UL << zone->compact_defer_shift; | |
92 | } | |
93 | ||
56de7263 MG |
94 | #else |
95 | static inline unsigned long try_to_compact_pages(struct zonelist *zonelist, | |
77f1fe6b | 96 | int order, gfp_t gfp_mask, nodemask_t *nodemask, |
53853e2d VB |
97 | enum migrate_mode mode, bool *contended, |
98 | struct zone **candidate_zone) | |
56de7263 MG |
99 | { |
100 | return COMPACT_CONTINUE; | |
101 | } | |
102 | ||
7103f16d | 103 | static inline void compact_pgdat(pg_data_t *pgdat, int order) |
7be62de9 | 104 | { |
7be62de9 RR |
105 | } |
106 | ||
62997027 MG |
107 | static inline void reset_isolation_suitable(pg_data_t *pgdat) |
108 | { | |
109 | } | |
110 | ||
3e7d3449 MG |
111 | static inline unsigned long compaction_suitable(struct zone *zone, int order) |
112 | { | |
113 | return COMPACT_SKIPPED; | |
114 | } | |
115 | ||
aff62249 | 116 | static inline void defer_compaction(struct zone *zone, int order) |
4f92e258 MG |
117 | { |
118 | } | |
119 | ||
aff62249 | 120 | static inline bool compaction_deferred(struct zone *zone, int order) |
4f92e258 | 121 | { |
c59e2610 | 122 | return true; |
4f92e258 MG |
123 | } |
124 | ||
76ab0f53 MG |
125 | #endif /* CONFIG_COMPACTION */ |
126 | ||
ed4a6d7f MG |
127 | #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) |
128 | extern int compaction_register_node(struct node *node); | |
129 | extern void compaction_unregister_node(struct node *node); | |
130 | ||
131 | #else | |
132 | ||
133 | static inline int compaction_register_node(struct node *node) | |
134 | { | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static inline void compaction_unregister_node(struct node *node) | |
139 | { | |
140 | } | |
141 | #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ | |
142 | ||
748446bb | 143 | #endif /* _LINUX_COMPACTION_H */ |