1 #ifndef _LINUX_COMPACTION_H
2 #define _LINUX_COMPACTION_H
4 /* Return values for compact_zone() and try_to_compact_pages() */
5 /* compaction didn't start as it was deferred due to past failures */
6 #define COMPACT_DEFERRED 0
7 /* compaction didn't start as it was not possible or direct reclaim was more suitable */
8 #define COMPACT_SKIPPED 1
9 /* compaction should continue to another pageblock */
10 #define COMPACT_CONTINUE 2
11 /* direct compaction partially compacted a zone and there are suitable pages */
12 #define COMPACT_PARTIAL 3
13 /* The full zone was compacted */
14 #define COMPACT_COMPLETE 4
15 /* For more detailed tracepoint output */
16 #define COMPACT_NO_SUITABLE_PAGE 5
17 #define COMPACT_NOT_SUITABLE_ZONE 6
18 #define COMPACT_CONTENDED 7
19 /* When adding new states, please adjust include/trace/events/compaction.h */
21 /* Used to signal whether compaction detected need_sched() or lock contention */
22 /* No contention detected */
23 #define COMPACT_CONTENDED_NONE 0
24 /* Either need_sched() was true or fatal signal pending */
25 #define COMPACT_CONTENDED_SCHED 1
26 /* Zone lock or lru_lock was contended in async compaction */
27 #define COMPACT_CONTENDED_LOCK 2
29 struct alloc_context
; /* in mm/internal.h */
31 #ifdef CONFIG_COMPACTION
32 extern int sysctl_compact_memory
;
33 extern int sysctl_compaction_handler(struct ctl_table
*table
, int write
,
34 void __user
*buffer
, size_t *length
, loff_t
*ppos
);
35 extern int sysctl_extfrag_threshold
;
36 extern int sysctl_extfrag_handler(struct ctl_table
*table
, int write
,
37 void __user
*buffer
, size_t *length
, loff_t
*ppos
);
38 extern int sysctl_compact_unevictable_allowed
;
40 extern int fragmentation_index(struct zone
*zone
, unsigned int order
);
41 extern unsigned long try_to_compact_pages(gfp_t gfp_mask
, unsigned int order
,
42 int alloc_flags
, const struct alloc_context
*ac
,
43 enum migrate_mode mode
, int *contended
);
44 extern void compact_pgdat(pg_data_t
*pgdat
, int order
);
45 extern void reset_isolation_suitable(pg_data_t
*pgdat
);
46 extern unsigned long compaction_suitable(struct zone
*zone
, int order
,
47 int alloc_flags
, int classzone_idx
);
49 extern void defer_compaction(struct zone
*zone
, int order
);
50 extern bool compaction_deferred(struct zone
*zone
, int order
);
51 extern void compaction_defer_reset(struct zone
*zone
, int order
,
53 extern bool compaction_restarting(struct zone
*zone
, int order
);
56 static inline unsigned long try_to_compact_pages(gfp_t gfp_mask
,
57 unsigned int order
, int alloc_flags
,
58 const struct alloc_context
*ac
,
59 enum migrate_mode mode
, int *contended
)
61 return COMPACT_CONTINUE
;
64 static inline void compact_pgdat(pg_data_t
*pgdat
, int order
)
68 static inline void reset_isolation_suitable(pg_data_t
*pgdat
)
72 static inline unsigned long compaction_suitable(struct zone
*zone
, int order
,
73 int alloc_flags
, int classzone_idx
)
75 return COMPACT_SKIPPED
;
78 static inline void defer_compaction(struct zone
*zone
, int order
)
82 static inline bool compaction_deferred(struct zone
*zone
, int order
)
87 #endif /* CONFIG_COMPACTION */
89 #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
90 extern int compaction_register_node(struct node
*node
);
91 extern void compaction_unregister_node(struct node
*node
);
95 static inline int compaction_register_node(struct node
*node
)
100 static inline void compaction_unregister_node(struct node
*node
)
103 #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */
105 #endif /* _LINUX_COMPACTION_H */