[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / compaction.h

#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 sysctl_extfrag_threshold;
extern int sysctl_extfrag_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,
			bool sync, bool *contended);
extern void compact_pgdat(pg_data_t *pgdat, int order);
extern void reset_isolation_suitable(pg_data_t *pgdat);
extern unsigned long compaction_suitable(struct zone *zone, int order);

/* Do not skip compaction more than 64 times */
#define COMPACT_MAX_DEFER_SHIFT 6

/*
 * Compaction is deferred when compaction fails to result in a page
 * allocation success. 1 << compact_defer_limit compactions are skipped up
 * to a limit of 1 << COMPACT_MAX_DEFER_SHIFT
 */
static inline void defer_compaction(struct zone *zone, int order)
{
	zone->compact_considered = 0;
	zone->compact_defer_shift++;

	if (order < zone->compact_order_failed)
		zone->compact_order_failed = order;

	if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT)
		zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT;
}

/* Returns true if compaction should be skipped this time */
static inline bool compaction_deferred(struct zone *zone, int order)
{
	unsigned long defer_limit = 1UL << zone->compact_defer_shift;

	if (order < zone->compact_order_failed)
		return false;

	/* Avoid possible overflow */
	if (++zone->compact_considered > defer_limit)
		zone->compact_considered = defer_limit;

	return zone->compact_considered < defer_limit;
}

/* Returns true if restarting compaction after many failures */
static inline bool compaction_restarting(struct zone *zone, int order)
{
	if (order < zone->compact_order_failed)
		return false;

	return zone->compact_defer_shift == COMPACT_MAX_DEFER_SHIFT &&
		zone->compact_considered >= 1UL << zone->compact_defer_shift;
}

#else
static inline unsigned long try_to_compact_pages(struct zonelist *zonelist,
			int order, gfp_t gfp_mask, nodemask_t *nodemask,
			bool sync, bool *contended)
{
	return COMPACT_CONTINUE;
}

static inline void compact_pgdat(pg_data_t *pgdat, int order)
{
}

static inline void reset_isolation_suitable(pg_data_t *pgdat)
{
}

static inline unsigned long compaction_suitable(struct zone *zone, int order)
{
	return COMPACT_SKIPPED;
}

static inline void defer_compaction(struct zone *zone, int order)
{
}

static inline bool compaction_deferred(struct zone *zone, int order)
{
	return true;
}

#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 */
Commit	Line	Data
748446bb MG	1	#ifndef _LINUX_COMPACTION_H
	2	#define _LINUX_COMPACTION_H
	3
56de7263 MG	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
748446bb	13
76ab0f53 MG	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);
5e771905 MG	18	extern int sysctl_extfrag_threshold;
	19	extern int sysctl_extfrag_handler(struct ctl_table *table, int write,
	20	void __user buffer, size_t length, loff_t *ppos);
56de7263 MG	21
	22	extern int fragmentation_index(struct zone *zone, unsigned int order);
	23	extern unsigned long try_to_compact_pages(struct zonelist *zonelist,
77f1fe6b	24	int order, gfp_t gfp_mask, nodemask_t *mask,
47ecfcb7	25	bool sync, bool *contended);
7103f16d	26	extern void compact_pgdat(pg_data_t *pgdat, int order);
62997027	27	extern void reset_isolation_suitable(pg_data_t *pgdat);
3e7d3449	28	extern unsigned long compaction_suitable(struct zone *zone, int order);
4f92e258 MG	29
	30	/* Do not skip compaction more than 64 times */
	31	#define COMPACT_MAX_DEFER_SHIFT 6
	32
	33	/*
	34	* Compaction is deferred when compaction fails to result in a page
	35	* allocation success. 1 << compact_defer_limit compactions are skipped up
	36	* to a limit of 1 << COMPACT_MAX_DEFER_SHIFT
	37	*/
aff62249	38	static inline void defer_compaction(struct zone *zone, int order)
4f92e258 MG	39	{
	40	zone->compact_considered = 0;
	41	zone->compact_defer_shift++;
	42
aff62249 RR	43	if (order < zone->compact_order_failed)
	44	zone->compact_order_failed = order;
	45
4f92e258 MG	46	if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT)
	47	zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT;
	48	}
	49
	50	/* Returns true if compaction should be skipped this time */
aff62249	51	static inline bool compaction_deferred(struct zone *zone, int order)
4f92e258 MG	52	{
	53	unsigned long defer_limit = 1UL << zone->compact_defer_shift;
	54
aff62249 RR	55	if (order < zone->compact_order_failed)
	56	return false;
	57
4f92e258 MG	58	/* Avoid possible overflow */
	59	if (++zone->compact_considered > defer_limit)
	60	zone->compact_considered = defer_limit;
	61
c59e2610	62	return zone->compact_considered < defer_limit;
4f92e258 MG	63	}
4f92e258 MG	64
62997027 MG	65	/* Returns true if restarting compaction after many failures */
	66	static inline bool compaction_restarting(struct zone *zone, int order)
	67	{
	68	if (order < zone->compact_order_failed)
	69	return false;
	70
	71	return zone->compact_defer_shift == COMPACT_MAX_DEFER_SHIFT &&
	72	zone->compact_considered >= 1UL << zone->compact_defer_shift;
	73	}
	74
56de7263 MG	75	#else
56de7263 MG	76	static inline unsigned long try_to_compact_pages(struct zonelist *zonelist,
77f1fe6b	77	int order, gfp_t gfp_mask, nodemask_t *nodemask,
47ecfcb7	78	bool sync, bool *contended)
56de7263 MG	79	{
	80	return COMPACT_CONTINUE;
	81	}
	82
7103f16d	83	static inline void compact_pgdat(pg_data_t *pgdat, int order)
7be62de9	84	{
7be62de9 RR	85	}
7be62de9 RR	86
62997027 MG	87	static inline void reset_isolation_suitable(pg_data_t *pgdat)
	88	{
	89	}
	90
3e7d3449 MG	91	static inline unsigned long compaction_suitable(struct zone *zone, int order)
	92	{
	93	return COMPACT_SKIPPED;
	94	}
	95
aff62249	96	static inline void defer_compaction(struct zone *zone, int order)
4f92e258 MG	97	{
	98	}
	99
aff62249	100	static inline bool compaction_deferred(struct zone *zone, int order)
4f92e258	101	{
c59e2610	102	return true;
4f92e258 MG	103	}
4f92e258 MG	104
76ab0f53 MG	105	#endif /* CONFIG_COMPACTION */
76ab0f53 MG	106
ed4a6d7f MG	107	#if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
	108	extern int compaction_register_node(struct node *node);
	109	extern void compaction_unregister_node(struct node *node);
	110
	111	#else
	112
	113	static inline int compaction_register_node(struct node *node)
	114	{
	115	return 0;
	116	}
	117
	118	static inline void compaction_unregister_node(struct node *node)
	119	{
	120	}
	121	#endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */
	122
748446bb	123	#endif /* _LINUX_COMPACTION_H */