1
2#ifndef _LINUX_COMPACTION_H
3#define _LINUX_COMPACTION_H
4
5
6
7
8
9enum compact_priority {
10 COMPACT_PRIO_SYNC_FULL,
11 MIN_COMPACT_PRIORITY = COMPACT_PRIO_SYNC_FULL,
12 COMPACT_PRIO_SYNC_LIGHT,
13 MIN_COMPACT_COSTLY_PRIORITY = COMPACT_PRIO_SYNC_LIGHT,
14 DEF_COMPACT_PRIORITY = COMPACT_PRIO_SYNC_LIGHT,
15 COMPACT_PRIO_ASYNC,
16 INIT_COMPACT_PRIORITY = COMPACT_PRIO_ASYNC
17};
18
19
20
21enum compact_result {
22
23 COMPACT_NOT_SUITABLE_ZONE,
24
25
26
27
28 COMPACT_SKIPPED,
29
30 COMPACT_DEFERRED,
31
32
33 COMPACT_INACTIVE = COMPACT_DEFERRED,
34
35
36 COMPACT_NO_SUITABLE_PAGE,
37
38 COMPACT_CONTINUE,
39
40
41
42
43
44 COMPACT_COMPLETE,
45
46
47
48
49 COMPACT_PARTIAL_SKIPPED,
50
51
52 COMPACT_CONTENDED,
53
54
55
56
57
58 COMPACT_SUCCESS,
59};
60
61struct alloc_context;
62
63
64
65
66
67
68static inline unsigned long compact_gap(unsigned int order)
69{
70
71
72
73
74
75
76
77
78
79
80
81
82
83 return 2UL << order;
84}
85
86#ifdef CONFIG_COMPACTION
87extern int sysctl_compact_memory;
88extern int sysctl_compaction_handler(struct ctl_table *table, int write,
89 void __user *buffer, size_t *length, loff_t *ppos);
90extern int sysctl_extfrag_threshold;
91extern int sysctl_compact_unevictable_allowed;
92
93extern int fragmentation_index(struct zone *zone, unsigned int order);
94extern enum compact_result try_to_compact_pages(gfp_t gfp_mask,
95 unsigned int order, unsigned int alloc_flags,
96 const struct alloc_context *ac, enum compact_priority prio,
97 struct page **page);
98extern void reset_isolation_suitable(pg_data_t *pgdat);
99extern enum compact_result compaction_suitable(struct zone *zone, int order,
100 unsigned int alloc_flags, int classzone_idx);
101
102extern void defer_compaction(struct zone *zone, int order);
103extern bool compaction_deferred(struct zone *zone, int order);
104extern void compaction_defer_reset(struct zone *zone, int order,
105 bool alloc_success);
106extern bool compaction_restarting(struct zone *zone, int order);
107
108
109static inline bool compaction_made_progress(enum compact_result result)
110{
111
112
113
114
115
116 if (result == COMPACT_SUCCESS)
117 return true;
118
119 return false;
120}
121
122
123static inline bool compaction_failed(enum compact_result result)
124{
125
126 if (result == COMPACT_COMPLETE)
127 return true;
128
129 return false;
130}
131
132
133
134
135
136static inline bool compaction_withdrawn(enum compact_result result)
137{
138
139
140
141
142 if (result == COMPACT_SKIPPED)
143 return true;
144
145
146
147
148
149
150
151
152 if (result == COMPACT_DEFERRED)
153 return true;
154
155
156
157
158
159 if (result == COMPACT_CONTENDED)
160 return true;
161
162
163
164
165
166 if (result == COMPACT_PARTIAL_SKIPPED)
167 return true;
168
169 return false;
170}
171
172
173bool compaction_zonelist_suitable(struct alloc_context *ac, int order,
174 int alloc_flags);
175
176extern int kcompactd_run(int nid);
177extern void kcompactd_stop(int nid);
178extern void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx);
179
180#else
181static inline void reset_isolation_suitable(pg_data_t *pgdat)
182{
183}
184
185static inline enum compact_result compaction_suitable(struct zone *zone, int order,
186 int alloc_flags, int classzone_idx)
187{
188 return COMPACT_SKIPPED;
189}
190
191static inline void defer_compaction(struct zone *zone, int order)
192{
193}
194
195static inline bool compaction_deferred(struct zone *zone, int order)
196{
197 return true;
198}
199
200static inline bool compaction_made_progress(enum compact_result result)
201{
202 return false;
203}
204
205static inline bool compaction_failed(enum compact_result result)
206{
207 return false;
208}
209
210static inline bool compaction_withdrawn(enum compact_result result)
211{
212 return true;
213}
214
215static inline int kcompactd_run(int nid)
216{
217 return 0;
218}
219static inline void kcompactd_stop(int nid)
220{
221}
222
223static inline void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx)
224{
225}
226
227#endif
228
229struct node;
230#if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
231extern int compaction_register_node(struct node *node);
232extern void compaction_unregister_node(struct node *node);
233
234#else
235
236static inline int compaction_register_node(struct node *node)
237{
238 return 0;
239}
240
241static inline void compaction_unregister_node(struct node *node)
242{
243}
244#endif
245
246#endif
247