include/linux/compaction.h

   1 #ifndef _LINUX_COMPACTION_H
   2 #define _LINUX_COMPACTION_H
   3
   4 /* Return values for compact_zone() and try_to_compact_pages() */
   5 /* compaction didn't start as it was not possible or direct reclaim was more suitable */
   6 #define COMPACT_SKIPPED         0
   7 /* compaction should continue to another pageblock */
   8 #define COMPACT_CONTINUE        1
   9 /* direct compaction partially compacted a zone and there are suitable pages */
  10 #define COMPACT_PARTIAL         2
  11 /* The full zone was compacted */
  12 #define COMPACT_COMPLETE        3
  13
  14 #ifdef CONFIG_COMPACTION
  15 extern int sysctl_compact_memory;
  16 extern int sysctl_compaction_handler(struct ctl_table *table, int write,
  17                         void __user *buffer, size_t *length, loff_t *ppos);
  18
  19 extern int fragmentation_index(struct zone *zone, unsigned int order);
  20 extern unsigned long try_to_compact_pages(struct zonelist *zonelist,
  21                         int order, gfp_t gfp_mask, nodemask_t *mask);
  22 #else
  23 static inline unsigned long try_to_compact_pages(struct zonelist *zonelist,
  24                         int order, gfp_t gfp_mask, nodemask_t *nodemask)
  25 {
  26         return COMPACT_CONTINUE;
  27 }
  28
  29 #endif /* CONFIG_COMPACTION */
  30
  31 #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
  32 extern int compaction_register_node(struct node *node);
  33 extern void compaction_unregister_node(struct node *node);
  34
  35 #else
  36
  37 static inline int compaction_register_node(struct node *node)
  38 {
  39         return 0;
  40 }
  41
  42 static inline void compaction_unregister_node(struct node *node)
  43 {
  44 }
  45 #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */
  46
  47 #endif /* _LINUX_COMPACTION_H */