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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <sched.h>
#include "alloc-util.h"
#include "cpu-set-util.h"
#include "dirent-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "macro.h"
#include "missing_syscall.h"
#include "numa-util.h"
#include "stdio-util.h"
#include "string-table.h"
bool numa_policy_is_valid(const NUMAPolicy *policy) {
assert(policy);
if (!mpol_is_valid(numa_policy_get_type(policy)))
return false;
if (!policy->nodes.set &&
!IN_SET(numa_policy_get_type(policy), MPOL_DEFAULT, MPOL_LOCAL, MPOL_PREFERRED))
return false;
if (policy->nodes.set &&
numa_policy_get_type(policy) == MPOL_PREFERRED &&
CPU_COUNT_S(policy->nodes.allocated, policy->nodes.set) != 1)
return false;
return true;
}
static int numa_policy_to_mempolicy(const NUMAPolicy *policy, unsigned long *ret_maxnode, unsigned long **ret_nodes) {
unsigned node, bits = 0, ulong_bits;
_cleanup_free_ unsigned long *out = NULL;
assert(policy);
assert(ret_maxnode);
assert(ret_nodes);
if (IN_SET(numa_policy_get_type(policy), MPOL_DEFAULT, MPOL_LOCAL) ||
(numa_policy_get_type(policy) == MPOL_PREFERRED && !policy->nodes.set)) {
*ret_nodes = NULL;
*ret_maxnode = 0;
return 0;
}
bits = policy->nodes.allocated * 8;
ulong_bits = sizeof(unsigned long) * 8;
out = new0(unsigned long, DIV_ROUND_UP(policy->nodes.allocated, sizeof(unsigned long)));
if (!out)
return -ENOMEM;
/* We don't make any assumptions about internal type libc is using to store NUMA node mask.
Hence we need to convert the node mask to the representation expected by set_mempolicy() */
for (node = 0; node < bits; node++)
if (CPU_ISSET_S(node, policy->nodes.allocated, policy->nodes.set))
out[node / ulong_bits] |= 1ul << (node % ulong_bits);
*ret_nodes = TAKE_PTR(out);
*ret_maxnode = bits + 1;
return 0;
}
int apply_numa_policy(const NUMAPolicy *policy) {
int r;
_cleanup_free_ unsigned long *nodes = NULL;
unsigned long maxnode;
assert(policy);
if (get_mempolicy(NULL, NULL, 0, 0, 0) < 0 && errno == ENOSYS)
return -EOPNOTSUPP;
if (!numa_policy_is_valid(policy))
return -EINVAL;
r = numa_policy_to_mempolicy(policy, &maxnode, &nodes);
if (r < 0)
return r;
r = set_mempolicy(numa_policy_get_type(policy), nodes, maxnode);
if (r < 0)
return -errno;
return 0;
}
int numa_to_cpu_set(const NUMAPolicy *policy, CPUSet *ret) {
int r;
size_t i;
_cleanup_(cpu_set_reset) CPUSet s = {};
assert(policy);
assert(ret);
for (i = 0; i < policy->nodes.allocated * 8; i++) {
_cleanup_free_ char *l = NULL;
char p[STRLEN("/sys/devices/system/node/node//cpulist") + DECIMAL_STR_MAX(size_t) + 1];
_cleanup_(cpu_set_reset) CPUSet part = {};
if (!CPU_ISSET_S(i, policy->nodes.allocated, policy->nodes.set))
continue;
xsprintf(p, "/sys/devices/system/node/node%zu/cpulist", i);
r = read_one_line_file(p, &l);
if (r < 0)
return r;
r = parse_cpu_set(l, &part);
if (r < 0)
return r;
r = cpu_set_add_all(&s, &part);
if (r < 0)
return r;
}
*ret = s;
s = (CPUSet) {};
return 0;
}
static int numa_max_node(void) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r, max_node = 0;
d = opendir("/sys/devices/system/node");
if (!d)
return -errno;
FOREACH_DIRENT(de, d, break) {
int node;
const char *n;
if (de->d_type != DT_DIR)
continue;
n = startswith(de->d_name, "node");
if (!n)
continue;
r = safe_atoi(n, &node);
if (r < 0)
continue;
if (node > max_node)
max_node = node;
}
return max_node;
}
int numa_mask_add_all(CPUSet *mask) {
int m;
assert(mask);
m = numa_max_node();
if (m < 0) {
log_debug_errno(m, "Failed to determine maximum NUMA node index, assuming 1023: %m");
m = 1023; /* CONFIG_NODES_SHIFT is set to 10 on x86_64, i.e. 1024 NUMA nodes in total */
}
for (int i = 0; i <= m; i++) {
int r;
r = cpu_set_add(mask, i);
if (r < 0)
return r;
}
return 0;
}
static const char* const mpol_table[] = {
[MPOL_DEFAULT] = "default",
[MPOL_PREFERRED] = "preferred",
[MPOL_BIND] = "bind",
[MPOL_INTERLEAVE] = "interleave",
[MPOL_LOCAL] = "local",
};
DEFINE_STRING_TABLE_LOOKUP(mpol, int);
|
