include/linux/node.h

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

File Facts

System
Linux kernel
Corpus path
include/linux/node.h
Extension
.h
Size
5750 bytes
Lines
214
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 access_coordinate {
	unsigned int read_bandwidth;
	unsigned int write_bandwidth;
	unsigned int read_latency;
	unsigned int write_latency;
};

/*
 * ACCESS_COORDINATE_LOCAL correlates to ACCESS CLASS 0
 *	- access_coordinate between target node and nearest initiator node
 * ACCESS_COORDINATE_CPU correlates to ACCESS CLASS 1
 *	- access_coordinate between target node and nearest CPU node
 */
enum access_coordinate_class {
	ACCESS_COORDINATE_LOCAL,
	ACCESS_COORDINATE_CPU,
	ACCESS_COORDINATE_MAX
};

enum cache_indexing {
	NODE_CACHE_DIRECT_MAP,
	NODE_CACHE_INDEXED,
	NODE_CACHE_OTHER,
};

enum cache_write_policy {
	NODE_CACHE_WRITE_BACK,
	NODE_CACHE_WRITE_THROUGH,
	NODE_CACHE_WRITE_OTHER,
};

enum cache_mode {
	NODE_CACHE_ADDR_MODE_RESERVED,
	NODE_CACHE_ADDR_MODE_EXTENDED_LINEAR,
};

/**
 * struct node_cache_attrs - system memory caching attributes
 *
 * @indexing:		The ways memory blocks may be placed in cache
 * @write_policy:	Write back or write through policy
 * @size:		Total size of cache in bytes
 * @line_size:		Number of bytes fetched on a cache miss
 * @level:		The cache hierarchy level
 * @address_mode:		The address mode
 */
struct node_cache_attrs {
	enum cache_indexing indexing;
	enum cache_write_policy write_policy;
	u64 size;
	u16 line_size;
	u8 level;
	u16 address_mode;
};

#ifdef CONFIG_HMEM_REPORTING
void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs);
void node_set_perf_attrs(unsigned int nid, struct access_coordinate *coord,
			 enum access_coordinate_class access);
void node_update_perf_attrs(unsigned int nid, struct access_coordinate *coord,
			    enum access_coordinate_class access);
#else
static inline void node_add_cache(unsigned int nid,
				  struct node_cache_attrs *cache_attrs)
{
}

static inline void node_set_perf_attrs(unsigned int nid,
				       struct access_coordinate *coord,
				       enum access_coordinate_class access)
{
}

static inline void node_update_perf_attrs(unsigned int nid,
					  struct access_coordinate *coord,
					  enum access_coordinate_class access)
{
}
#endif

struct node {
	struct device	dev;
	struct list_head access_list;
#ifdef CONFIG_HMEM_REPORTING
	struct list_head cache_attrs;
	struct device *cache_dev;
#endif
};

struct memory_block;

Annotation

Implementation Notes