1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_MEMORY_TIERS_H
#define _LINUX_MEMORY_TIERS_H
#include <linux/types.h>
#include <linux/nodemask.h>
#include <linux/kref.h>
#include <linux/mmzone.h>
#include <linux/notifier.h>
/*
* Each tier cover a abstrace distance chunk size of 128
*/
#define MEMTIER_CHUNK_BITS 7
#define MEMTIER_CHUNK_SIZE (1 << MEMTIER_CHUNK_BITS)
/*
* Smaller abstract distance values imply faster (higher) memory tiers. Offset
* the DRAM adistance so that we can accommodate devices with a slightly lower
* adistance value (slightly faster) than default DRAM adistance to be part of
* the same memory tier.
*/
#define MEMTIER_ADISTANCE_DRAM ((4 * MEMTIER_CHUNK_SIZE) + (MEMTIER_CHUNK_SIZE >> 1))
struct memory_tier;
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 node_hmem_attrs;
#ifdef CONFIG_NUMA
extern bool numa_demotion_enabled;
extern struct memory_dev_type *default_dram_type;
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 node_hmem_attrs *perf,
const char *source);
int mt_perf_to_adistance(struct node_hmem_attrs *perf, int *adist);
#ifdef CONFIG_MIGRATION
int next_demotion_node(int node);
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)
{
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
/*
* 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)
{
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;
}
static inline int register_mt_adistance_algorithm(struct notifier_block *nb)
{
return 0;
}
static inline int unregister_mt_adistance_algorithm(struct notifier_block *nb)
{
return 0;
}
static inline int mt_calc_adistance(int node, int *adist)
{
return NOTIFY_DONE;
}
static inline int mt_set_default_dram_perf(int nid, struct node_hmem_attrs *perf,
const char *source)
{
return -EIO;
}
static inline int mt_perf_to_adistance(struct node_hmem_attrs *perf, int *adist)
{
return -EIO;
}
#endif /* CONFIG_NUMA */
#endif /* _LINUX_MEMORY_TIERS_H */
|
