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 | |
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, |
53853e2d | 36 | struct zone **candidate_zone); |
7103f16d | 37 | extern void compact_pgdat(pg_data_t *pgdat, int order); |
62997027 | 38 | extern void reset_isolation_suitable(pg_data_t *pgdat); |
3e7d3449 | 39 | extern unsigned long compaction_suitable(struct zone *zone, int order); |
4f92e258 MG |
40 | |
41 | /* Do not skip compaction more than 64 times */ | |
42 | #define COMPACT_MAX_DEFER_SHIFT 6 | |
43 | ||
44 | /* | |
45 | * Compaction is deferred when compaction fails to result in a page | |
46 | * allocation success. 1 << compact_defer_limit compactions are skipped up | |
47 | * to a limit of 1 << COMPACT_MAX_DEFER_SHIFT | |
48 | */ | |
aff62249 | 49 | static inline void defer_compaction(struct zone *zone, int order) |
4f92e258 MG |
50 | { |
51 | zone->compact_considered = 0; | |
52 | zone->compact_defer_shift++; | |
53 | ||
aff62249 RR |
54 | if (order < zone->compact_order_failed) |
55 | zone->compact_order_failed = order; | |
56 | ||
4f92e258 MG |
57 | if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT) |
58 | zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT; | |
59 | } | |
60 | ||
61 | /* Returns true if compaction should be skipped this time */ | |
aff62249 | 62 | static inline bool compaction_deferred(struct zone *zone, int order) |
4f92e258 MG |
63 | { |
64 | unsigned long defer_limit = 1UL << zone->compact_defer_shift; | |
65 | ||
aff62249 RR |
66 | if (order < zone->compact_order_failed) |
67 | return false; | |
68 | ||
4f92e258 MG |
69 | /* Avoid possible overflow */ |
70 | if (++zone->compact_considered > defer_limit) | |
71 | zone->compact_considered = defer_limit; | |
72 | ||
c59e2610 | 73 | return zone->compact_considered < defer_limit; |
4f92e258 MG |
74 | } |
75 | ||
de6c60a6 VB |
76 | /* |
77 | * Update defer tracking counters after successful compaction of given order, | |
78 | * which means an allocation either succeeded (alloc_success == true) or is | |
79 | * expected to succeed. | |
80 | */ | |
81 | static inline void compaction_defer_reset(struct zone *zone, int order, | |
82 | bool alloc_success) | |
83 | { | |
84 | if (alloc_success) { | |
85 | zone->compact_considered = 0; | |
86 | zone->compact_defer_shift = 0; | |
87 | } | |
88 | if (order >= zone->compact_order_failed) | |
89 | zone->compact_order_failed = order + 1; | |
90 | } | |
91 | ||
62997027 MG |
92 | /* Returns true if restarting compaction after many failures */ |
93 | static inline bool compaction_restarting(struct zone *zone, int order) | |
94 | { | |
95 | if (order < zone->compact_order_failed) | |
96 | return false; | |
97 | ||
98 | return zone->compact_defer_shift == COMPACT_MAX_DEFER_SHIFT && | |
99 | zone->compact_considered >= 1UL << zone->compact_defer_shift; | |
100 | } | |
101 | ||
56de7263 MG |
102 | #else |
103 | static inline unsigned long try_to_compact_pages(struct zonelist *zonelist, | |
77f1fe6b | 104 | int order, gfp_t gfp_mask, nodemask_t *nodemask, |
1f9efdef | 105 | enum migrate_mode mode, int *contended, |
53853e2d | 106 | struct zone **candidate_zone) |
56de7263 MG |
107 | { |
108 | return COMPACT_CONTINUE; | |
109 | } | |
110 | ||
7103f16d | 111 | static inline void compact_pgdat(pg_data_t *pgdat, int order) |
7be62de9 | 112 | { |
7be62de9 RR |
113 | } |
114 | ||
62997027 MG |
115 | static inline void reset_isolation_suitable(pg_data_t *pgdat) |
116 | { | |
117 | } | |
118 | ||
3e7d3449 MG |
119 | static inline unsigned long compaction_suitable(struct zone *zone, int order) |
120 | { | |
121 | return COMPACT_SKIPPED; | |
122 | } | |
123 | ||
aff62249 | 124 | static inline void defer_compaction(struct zone *zone, int order) |
4f92e258 MG |
125 | { |
126 | } | |
127 | ||
aff62249 | 128 | static inline bool compaction_deferred(struct zone *zone, int order) |
4f92e258 | 129 | { |
c59e2610 | 130 | return true; |
4f92e258 MG |
131 | } |
132 | ||
76ab0f53 MG |
133 | #endif /* CONFIG_COMPACTION */ |
134 | ||
ed4a6d7f MG |
135 | #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) |
136 | extern int compaction_register_node(struct node *node); | |
137 | extern void compaction_unregister_node(struct node *node); | |
138 | ||
139 | #else | |
140 | ||
141 | static inline int compaction_register_node(struct node *node) | |
142 | { | |
143 | return 0; | |
144 | } | |
145 | ||
146 | static inline void compaction_unregister_node(struct node *node) | |
147 | { | |
148 | } | |
149 | #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ | |
150 | ||
748446bb | 151 | #endif /* _LINUX_COMPACTION_H */ |