mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-18 08:51:06 +00:00
279 lines
7.4 KiB
C
279 lines
7.4 KiB
C
/* Generic test case for CPU affinity functions.
|
|
Copyright (C) 2015-2017 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"
|