| #ifndef _LINUX_COMPACTION_H |
| #define _LINUX_COMPACTION_H |
| |
| /* Return values for compact_zone() and try_to_compact_pages() */ |
| /* compaction didn't start as it was not possible or direct reclaim was more suitable */ |
| #define COMPACT_SKIPPED 0 |
| /* compaction should continue to another pageblock */ |
| #define COMPACT_CONTINUE 1 |
| /* direct compaction partially compacted a zone and there are suitable pages */ |
| #define COMPACT_PARTIAL 2 |
| /* The full zone was compacted */ |
| #define COMPACT_COMPLETE 3 |
| |
| #ifdef CONFIG_COMPACTION |
| extern int sysctl_compact_memory; |
| extern int sysctl_compaction_handler(struct ctl_table *table, int write, |
| void __user *buffer, size_t *length, loff_t *ppos); |
| |
| extern int fragmentation_index(struct zone *zone, unsigned int order); |
| extern unsigned long try_to_compact_pages(struct zonelist *zonelist, |
| int order, gfp_t gfp_mask, nodemask_t *mask); |
| #else |
| static inline unsigned long try_to_compact_pages(struct zonelist *zonelist, |
| int order, gfp_t gfp_mask, nodemask_t *nodemask) |
| { |
| return COMPACT_CONTINUE; |
| } |
| |
| #endif /* CONFIG_COMPACTION */ |
| |
| #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) |
| extern int compaction_register_node(struct node *node); |
| extern void compaction_unregister_node(struct node *node); |
| |
| #else |
| |
| static inline int compaction_register_node(struct node *node) |
| { |
| return 0; |
| } |
| |
| static inline void compaction_unregister_node(struct node *node) |
| { |
| } |
| #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ |
| |
| #endif /* _LINUX_COMPACTION_H */ |