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glibc/sysdeps/unix/sysv/linux/tst-skeleton-affinity.c
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/* 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" |