include/linux/memory-tiers.h

Source file repositories/reference/linux-study-clean/include/linux/memory-tiers.h

File Facts

System
Linux kernel
Corpus path
include/linux/memory-tiers.h
Extension
.h
Size
4132 bytes
Lines
156
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct memory_dev_type {
	/* list of memory types that are part of same tier as this type */
	struct list_head tier_sibling;
	/* list of memory types that are managed by one driver */
	struct list_head list;
	/* abstract distance for this specific memory type */
	int adistance;
	/* Nodes of same abstract distance */
	nodemask_t nodes;
	struct kref kref;
};

struct access_coordinate;

#ifdef CONFIG_NUMA
extern bool numa_demotion_enabled;
extern struct memory_dev_type *default_dram_type;
extern nodemask_t default_dram_nodes;
struct memory_dev_type *alloc_memory_type(int adistance);
void put_memory_type(struct memory_dev_type *memtype);
void init_node_memory_type(int node, struct memory_dev_type *default_type);
void clear_node_memory_type(int node, struct memory_dev_type *memtype);
int register_mt_adistance_algorithm(struct notifier_block *nb);
int unregister_mt_adistance_algorithm(struct notifier_block *nb);
int mt_calc_adistance(int node, int *adist);
int mt_set_default_dram_perf(int nid, struct access_coordinate *perf,
			     const char *source);
int mt_perf_to_adistance(struct access_coordinate *perf, int *adist);
struct memory_dev_type *mt_find_alloc_memory_type(int adist,
						  struct list_head *memory_types);
void mt_put_memory_types(struct list_head *memory_types);
#ifdef CONFIG_NUMA_MIGRATION
int next_demotion_node(int node, const nodemask_t *allowed_mask);
void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets);
bool node_is_toptier(int node);
#else
static inline int next_demotion_node(int node, const nodemask_t *allowed_mask)
{
	return NUMA_NO_NODE;
}

static inline void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets)
{
	*targets = NODE_MASK_NONE;
}

static inline bool node_is_toptier(int node)
{
	return true;
}
#endif

#else

#define numa_demotion_enabled	false
#define default_dram_type	NULL
#define default_dram_nodes	NODE_MASK_NONE
/*
 * CONFIG_NUMA implementation returns non NULL error.
 */
static inline struct memory_dev_type *alloc_memory_type(int adistance)
{
	return NULL;
}

static inline void put_memory_type(struct memory_dev_type *memtype)
{

}

static inline void init_node_memory_type(int node, struct memory_dev_type *default_type)
{

}

static inline void clear_node_memory_type(int node, struct memory_dev_type *memtype)
{

}

static inline int next_demotion_node(int node, const nodemask_t *allowed_mask)
{
	return NUMA_NO_NODE;
}

static inline void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets)
{
	*targets = NODE_MASK_NONE;
}

Annotation

Implementation Notes