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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 | |
1f9efdef VB |
16 | /* Used to signal whether compaction detected need_sched() or lock contention */ |
17 | /* No contention detected */ | |
18 | #define COMPACT_CONTENDED_NONE 0 | |
19 | /* Either need_sched() was true or fatal signal pending */ | |
20 | #define COMPACT_CONTENDED_SCHED 1 | |
21 | /* Zone lock or lru_lock was contended in async compaction */ | |
22 | #define COMPACT_CONTENDED_LOCK 2 | |
23 | ||
76ab0f53 MG |
24 | #ifdef CONFIG_COMPACTION |
25 | extern int sysctl_compact_memory; | |
26 | extern int sysctl_compaction_handler(struct ctl_table *table, int write, | |
27 | void __user *buffer, size_t *length, loff_t *ppos); | |
5e771905 MG |
28 | extern int sysctl_extfrag_threshold; |
29 | extern int sysctl_extfrag_handler(struct ctl_table *table, int write, | |
30 | void __user *buffer, size_t *length, loff_t *ppos); | |
56de7263 MG |
31 | |
32 | extern int fragmentation_index(struct zone *zone, unsigned int order); | |
33 | extern unsigned long try_to_compact_pages(struct zonelist *zonelist, | |
77f1fe6b | 34 | int order, gfp_t gfp_mask, nodemask_t *mask, |
1f9efdef | 35 | enum migrate_mode mode, int *contended, |
97d47a65 | 36 | int alloc_flags, int classzone_idx); |
7103f16d | 37 | extern void compact_pgdat(pg_data_t *pgdat, int order); |
62997027 | 38 | extern void reset_isolation_suitable(pg_data_t *pgdat); |
ebff3980 VB |
39 | extern unsigned long compaction_suitable(struct zone *zone, int order, |
40 | int alloc_flags, int classzone_idx); | |
4f92e258 MG |
41 | |
42 | /* Do not skip compaction more than 64 times */ | |
43 | #define COMPACT_MAX_DEFER_SHIFT 6 | |
44 | ||
45 | /* | |
46 | * Compaction is deferred when compaction fails to result in a page | |
47 | * allocation success. 1 << compact_defer_limit compactions are skipped up | |
48 | * to a limit of 1 << COMPACT_MAX_DEFER_SHIFT | |
49 | */ | |
aff62249 | 50 | static inline void defer_compaction(struct zone *zone, int order) |
4f92e258 MG |
51 | { |
52 | zone->compact_considered = 0; | |
53 | zone->compact_defer_shift++; | |
54 | ||
aff62249 RR |
55 | if (order < zone->compact_order_failed) |
56 | zone->compact_order_failed = order; | |
57 | ||
4f92e258 MG |
58 | if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT) |
59 | zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT; | |
60 | } | |
61 | ||
62 | /* Returns true if compaction should be skipped this time */ | |
aff62249 | 63 | static inline bool compaction_deferred(struct zone *zone, int order) |
4f92e258 MG |
64 | { |
65 | unsigned long defer_limit = 1UL << zone->compact_defer_shift; | |
66 | ||
aff62249 RR |
67 | if (order < zone->compact_order_failed) |
68 | return false; | |
69 | ||
4f92e258 MG |
70 | /* Avoid possible overflow */ |
71 | if (++zone->compact_considered > defer_limit) | |
72 | zone->compact_considered = defer_limit; | |
73 | ||
c59e2610 | 74 | return zone->compact_considered < defer_limit; |
4f92e258 MG |
75 | } |
76 | ||
de6c60a6 VB |
77 | /* |
78 | * Update defer tracking counters after successful compaction of given order, | |
79 | * which means an allocation either succeeded (alloc_success == true) or is | |
80 | * expected to succeed. | |
81 | */ | |
82 | static inline void compaction_defer_reset(struct zone *zone, int order, | |
83 | bool alloc_success) | |
84 | { | |
85 | if (alloc_success) { | |
86 | zone->compact_considered = 0; | |
87 | zone->compact_defer_shift = 0; | |
88 | } | |
89 | if (order >= zone->compact_order_failed) | |
90 | zone->compact_order_failed = order + 1; | |
91 | } | |
92 | ||
62997027 MG |
93 | /* Returns true if restarting compaction after many failures */ |
94 | static inline bool compaction_restarting(struct zone *zone, int order) | |
95 | { | |
96 | if (order < zone->compact_order_failed) | |
97 | return false; | |
98 | ||
99 | return zone->compact_defer_shift == COMPACT_MAX_DEFER_SHIFT && | |
100 | zone->compact_considered >= 1UL << zone->compact_defer_shift; | |
101 | } | |
102 | ||
56de7263 MG |
103 | #else |
104 | static inline unsigned long try_to_compact_pages(struct zonelist *zonelist, | |
77f1fe6b | 105 | int order, gfp_t gfp_mask, nodemask_t *nodemask, |
1f9efdef | 106 | enum migrate_mode mode, int *contended, |
97d47a65 | 107 | int alloc_flags, int classzone_idx) |
56de7263 MG |
108 | { |
109 | return COMPACT_CONTINUE; | |
110 | } | |
111 | ||
7103f16d | 112 | static inline void compact_pgdat(pg_data_t *pgdat, int order) |
7be62de9 | 113 | { |
7be62de9 RR |
114 | } |
115 | ||
62997027 MG |
116 | static inline void reset_isolation_suitable(pg_data_t *pgdat) |
117 | { | |
118 | } | |
119 | ||
ebff3980 VB |
120 | static inline unsigned long compaction_suitable(struct zone *zone, int order, |
121 | int alloc_flags, int classzone_idx) | |
3e7d3449 MG |
122 | { |
123 | return COMPACT_SKIPPED; | |
124 | } | |
125 | ||
aff62249 | 126 | static inline void defer_compaction(struct zone *zone, int order) |
4f92e258 MG |
127 | { |
128 | } | |
129 | ||
aff62249 | 130 | static inline bool compaction_deferred(struct zone *zone, int order) |
4f92e258 | 131 | { |
c59e2610 | 132 | return true; |
4f92e258 MG |
133 | } |
134 | ||
76ab0f53 MG |
135 | #endif /* CONFIG_COMPACTION */ |
136 | ||
ed4a6d7f MG |
137 | #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) |
138 | extern int compaction_register_node(struct node *node); | |
139 | extern void compaction_unregister_node(struct node *node); | |
140 | ||
141 | #else | |
142 | ||
143 | static inline int compaction_register_node(struct node *node) | |
144 | { | |
145 | return 0; | |
146 | } | |
147 | ||
148 | static inline void compaction_unregister_node(struct node *node) | |
149 | { | |
150 | } | |
151 | #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ | |
152 | ||
748446bb | 153 | #endif /* _LINUX_COMPACTION_H */ |