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1 | #ifndef _LINUX_COMPACTION_H |
2 | #define _LINUX_COMPACTION_H | |
3 | ||
56de7263 MG |
4 | /* Return values for compact_zone() and try_to_compact_pages() */ |
5 | /* compaction didn't start as it was not possible or direct reclaim was more suitable */ | |
6 | #define COMPACT_SKIPPED 0 | |
7 | /* compaction should continue to another pageblock */ | |
8 | #define COMPACT_CONTINUE 1 | |
9 | /* direct compaction partially compacted a zone and there are suitable pages */ | |
10 | #define COMPACT_PARTIAL 2 | |
11 | /* The full zone was compacted */ | |
12 | #define COMPACT_COMPLETE 3 | |
748446bb | 13 | |
76ab0f53 MG |
14 | #ifdef CONFIG_COMPACTION |
15 | extern int sysctl_compact_memory; | |
16 | extern int sysctl_compaction_handler(struct ctl_table *table, int write, | |
17 | void __user *buffer, size_t *length, loff_t *ppos); | |
5e771905 MG |
18 | extern int sysctl_extfrag_threshold; |
19 | extern int sysctl_extfrag_handler(struct ctl_table *table, int write, | |
20 | void __user *buffer, size_t *length, loff_t *ppos); | |
56de7263 MG |
21 | |
22 | extern int fragmentation_index(struct zone *zone, unsigned int order); | |
23 | extern unsigned long try_to_compact_pages(struct zonelist *zonelist, | |
77f1fe6b | 24 | int order, gfp_t gfp_mask, nodemask_t *mask, |
47ecfcb7 | 25 | bool sync, bool *contended); |
7103f16d | 26 | extern void compact_pgdat(pg_data_t *pgdat, int order); |
62997027 | 27 | extern void reset_isolation_suitable(pg_data_t *pgdat); |
3e7d3449 | 28 | extern unsigned long compaction_suitable(struct zone *zone, int order); |
4f92e258 MG |
29 | |
30 | /* Do not skip compaction more than 64 times */ | |
31 | #define COMPACT_MAX_DEFER_SHIFT 6 | |
32 | ||
33 | /* | |
34 | * Compaction is deferred when compaction fails to result in a page | |
35 | * allocation success. 1 << compact_defer_limit compactions are skipped up | |
36 | * to a limit of 1 << COMPACT_MAX_DEFER_SHIFT | |
37 | */ | |
aff62249 | 38 | static inline void defer_compaction(struct zone *zone, int order) |
4f92e258 MG |
39 | { |
40 | zone->compact_considered = 0; | |
41 | zone->compact_defer_shift++; | |
42 | ||
aff62249 RR |
43 | if (order < zone->compact_order_failed) |
44 | zone->compact_order_failed = order; | |
45 | ||
4f92e258 MG |
46 | if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT) |
47 | zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT; | |
48 | } | |
49 | ||
50 | /* Returns true if compaction should be skipped this time */ | |
aff62249 | 51 | static inline bool compaction_deferred(struct zone *zone, int order) |
4f92e258 MG |
52 | { |
53 | unsigned long defer_limit = 1UL << zone->compact_defer_shift; | |
54 | ||
aff62249 RR |
55 | if (order < zone->compact_order_failed) |
56 | return false; | |
57 | ||
4f92e258 MG |
58 | /* Avoid possible overflow */ |
59 | if (++zone->compact_considered > defer_limit) | |
60 | zone->compact_considered = defer_limit; | |
61 | ||
c59e2610 | 62 | return zone->compact_considered < defer_limit; |
4f92e258 MG |
63 | } |
64 | ||
de6c60a6 VB |
65 | /* |
66 | * Update defer tracking counters after successful compaction of given order, | |
67 | * which means an allocation either succeeded (alloc_success == true) or is | |
68 | * expected to succeed. | |
69 | */ | |
70 | static inline void compaction_defer_reset(struct zone *zone, int order, | |
71 | bool alloc_success) | |
72 | { | |
73 | if (alloc_success) { | |
74 | zone->compact_considered = 0; | |
75 | zone->compact_defer_shift = 0; | |
76 | } | |
77 | if (order >= zone->compact_order_failed) | |
78 | zone->compact_order_failed = order + 1; | |
79 | } | |
80 | ||
62997027 MG |
81 | /* Returns true if restarting compaction after many failures */ |
82 | static inline bool compaction_restarting(struct zone *zone, int order) | |
83 | { | |
84 | if (order < zone->compact_order_failed) | |
85 | return false; | |
86 | ||
87 | return zone->compact_defer_shift == COMPACT_MAX_DEFER_SHIFT && | |
88 | zone->compact_considered >= 1UL << zone->compact_defer_shift; | |
89 | } | |
90 | ||
56de7263 MG |
91 | #else |
92 | static inline unsigned long try_to_compact_pages(struct zonelist *zonelist, | |
77f1fe6b | 93 | int order, gfp_t gfp_mask, nodemask_t *nodemask, |
47ecfcb7 | 94 | bool sync, bool *contended) |
56de7263 MG |
95 | { |
96 | return COMPACT_CONTINUE; | |
97 | } | |
98 | ||
7103f16d | 99 | static inline void compact_pgdat(pg_data_t *pgdat, int order) |
7be62de9 | 100 | { |
7be62de9 RR |
101 | } |
102 | ||
62997027 MG |
103 | static inline void reset_isolation_suitable(pg_data_t *pgdat) |
104 | { | |
105 | } | |
106 | ||
3e7d3449 MG |
107 | static inline unsigned long compaction_suitable(struct zone *zone, int order) |
108 | { | |
109 | return COMPACT_SKIPPED; | |
110 | } | |
111 | ||
aff62249 | 112 | static inline void defer_compaction(struct zone *zone, int order) |
4f92e258 MG |
113 | { |
114 | } | |
115 | ||
aff62249 | 116 | static inline bool compaction_deferred(struct zone *zone, int order) |
4f92e258 | 117 | { |
c59e2610 | 118 | return true; |
4f92e258 MG |
119 | } |
120 | ||
76ab0f53 MG |
121 | #endif /* CONFIG_COMPACTION */ |
122 | ||
ed4a6d7f MG |
123 | #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) |
124 | extern int compaction_register_node(struct node *node); | |
125 | extern void compaction_unregister_node(struct node *node); | |
126 | ||
127 | #else | |
128 | ||
129 | static inline int compaction_register_node(struct node *node) | |
130 | { | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static inline void compaction_unregister_node(struct node *node) | |
135 | { | |
136 | } | |
137 | #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ | |
138 | ||
748446bb | 139 | #endif /* _LINUX_COMPACTION_H */ |