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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
|
/* Generic test case for CPU affinity functions.
Copyright (C) 2015-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/* This file is included by the tst-affinity*.c files to test the two
variants of the functions, under different conditions. The
following functions have to be definied:
static int getaffinity (size_t, cpu_set_t *);
static int setaffinity (size_t, const cpu_set_t *);
static bool early_test (struct conf *);
The first two functions shall affect the affinity mask for the
current thread and return 0 for success, -1 for error (with an
error code in errno).
early_test is invoked before the tests in this file affect the
affinity masks. If it returns true, testing continues, otherwise
no more tests run and the overall test exits with status 1.
*/
#include <errno.h>
#include <limits.h>
#include <sched.h>
#include <stdbool.h>
#include <stdio.h>
/* CPU set configuration determined. Can be used from early_test. */
struct conf
{
int set_size; /* in bits */
int last_cpu;
};
static int
find_set_size (void)
{
/* There is considerable controversy about how to determine the size
of the kernel CPU mask. The probing loop below is only intended
for testing purposes. */
for (int num_cpus = 64; num_cpus <= INT_MAX / 2; ++num_cpus)
{
cpu_set_t *set = CPU_ALLOC (num_cpus);
size_t size = CPU_ALLOC_SIZE (num_cpus);
if (set == NULL)
{
printf ("error: CPU_ALLOC (%d) failed\n", num_cpus);
return -1;
}
if (getaffinity (size, set) == 0)
{
CPU_FREE (set);
return num_cpus;
}
if (errno != EINVAL)
{
printf ("error: getaffinity for %d CPUs: %m\n", num_cpus);
CPU_FREE (set);
return -1;
}
CPU_FREE (set);
}
puts ("error: Cannot find maximum CPU number");
return -1;
}
static int
find_last_cpu (const cpu_set_t *set, size_t size)
{
/* We need to determine the set size with CPU_COUNT_S and the
cpus_found counter because there is no direct way to obtain the
actual CPU set size, in bits, from the value of
CPU_ALLOC_SIZE. */
size_t cpus_found = 0;
size_t total_cpus = CPU_COUNT_S (size, set);
int last_cpu = -1;
for (int cpu = 0; cpus_found < total_cpus; ++cpu)
{
if (CPU_ISSET_S (cpu, size, set))
{
last_cpu = cpu;
++cpus_found;
}
}
return last_cpu;
}
static void
setup_conf (struct conf *conf)
{
*conf = (struct conf) {-1, -1};
conf->set_size = find_set_size ();
if (conf->set_size > 0)
{
cpu_set_t *set = CPU_ALLOC (conf->set_size);
if (set == NULL)
{
printf ("error: CPU_ALLOC (%d) failed\n", conf->set_size);
CPU_FREE (set);
return;
}
if (getaffinity (CPU_ALLOC_SIZE (conf->set_size), set) < 0)
{
printf ("error: getaffinity failed: %m\n");
CPU_FREE (set);
return;
}
conf->last_cpu = find_last_cpu (set, CPU_ALLOC_SIZE (conf->set_size));
if (conf->last_cpu < 0)
puts ("info: No test CPU found");
CPU_FREE (set);
}
}
static bool
test_size (const struct conf *conf, size_t size)
{
if (size < conf->set_size)
{
printf ("info: Test not run for CPU set size %zu\n", size);
return true;
}
cpu_set_t *initial_set = CPU_ALLOC (size);
cpu_set_t *set2 = CPU_ALLOC (size);
cpu_set_t *active_cpu_set = CPU_ALLOC (size);
if (initial_set == NULL || set2 == NULL || active_cpu_set == NULL)
{
printf ("error: size %zu: CPU_ALLOC failed\n", size);
return false;
}
size_t kernel_size = CPU_ALLOC_SIZE (size);
if (getaffinity (kernel_size, initial_set) < 0)
{
printf ("error: size %zu: getaffinity: %m\n", size);
return false;
}
if (setaffinity (kernel_size, initial_set) < 0)
{
printf ("error: size %zu: setaffinity: %m\n", size);
return true;
}
/* Use one-CPU set to test switching between CPUs. */
int last_active_cpu = -1;
for (int cpu = 0; cpu <= conf->last_cpu; ++cpu)
{
int active_cpu = sched_getcpu ();
if (last_active_cpu >= 0 && last_active_cpu != active_cpu)
{
printf ("error: Unexpected CPU %d, expected %d\n",
active_cpu, last_active_cpu);
return false;
}
if (!CPU_ISSET_S (cpu, kernel_size, initial_set))
continue;
last_active_cpu = cpu;
CPU_ZERO_S (kernel_size, active_cpu_set);
CPU_SET_S (cpu, kernel_size, active_cpu_set);
if (setaffinity (kernel_size, active_cpu_set) < 0)
{
printf ("error: size %zu: setaffinity (%d): %m\n", size, cpu);
return false;
}
active_cpu = sched_getcpu ();
if (active_cpu != cpu)
{
printf ("error: Unexpected CPU %d, expected %d\n", active_cpu, cpu);
return false;
}
if (getaffinity (kernel_size, set2) < 0)
{
printf ("error: size %zu: getaffinity (2): %m\n", size);
return false;
}
if (!CPU_EQUAL_S (kernel_size, active_cpu_set, set2))
{
printf ("error: size %zu: CPU sets do not match\n", size);
return false;
}
}
/* Test setting the all-ones set. */
for (int cpu = 0; cpu < size; ++cpu)
CPU_SET_S (cpu, kernel_size, set2);
if (setaffinity (kernel_size, set2) < 0)
{
printf ("error: size %zu: setaffinity (3): %m\n", size);
return false;
}
if (setaffinity (kernel_size, initial_set) < 0)
{
printf ("error: size %zu: setaffinity (4): %m\n", size);
return false;
}
if (getaffinity (kernel_size, set2) < 0)
{
printf ("error: size %zu: getaffinity (3): %m\n", size);
return false;
}
if (!CPU_EQUAL_S (kernel_size, initial_set, set2))
{
printf ("error: size %zu: CPU sets do not match (2)\n", size);
return false;
}
CPU_FREE (initial_set);
CPU_FREE (set2);
CPU_FREE (active_cpu_set);
return true;
}
static int
do_test (void)
{
{
cpu_set_t set;
if (getaffinity (sizeof (set), &set) < 0 && errno == ENOSYS)
{
puts ("warning: getaffinity not supported, test cannot run");
return 0;
}
if (sched_getcpu () < 0 && errno == ENOSYS)
{
puts ("warning: sched_getcpu not supported, test cannot run");
return 0;
}
}
struct conf conf;
setup_conf (&conf);
printf ("info: Detected CPU set size (in bits): %d\n", conf.set_size);
printf ("info: Maximum test CPU: %d\n", conf.last_cpu);
if (conf.set_size < 0 || conf.last_cpu < 0)
return 1;
if (!early_test (&conf))
return 1;
bool error = false;
error |= !test_size (&conf, 1024);
error |= !test_size (&conf, conf.set_size);
error |= !test_size (&conf, 2);
error |= !test_size (&conf, 32);
error |= !test_size (&conf, 40);
error |= !test_size (&conf, 64);
error |= !test_size (&conf, 96);
error |= !test_size (&conf, 128);
error |= !test_size (&conf, 256);
error |= !test_size (&conf, 8192);
return error;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
|
