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/*
* Copyright (C) 2013-2019 Canonical, Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* This code is a complete clean re-write of the stress tool by
* Colin Ian King <colin.king@canonical.com> and attempts to be
* backwardly compatible with the stress tool by Amos Waterland
* <apw@rossby.metr.ou.edu> but has more stress tests and more
* functionality.
*
*/
#include "stress-ng.h"
#if defined(HAVE_AFFINITY)
/*
* stress_affinity_supported()
* check that we can set affinity
*/
static int stress_affinity_supported(void)
{
cpu_set_t mask;
CPU_ZERO(&mask);
if (sched_getaffinity(0, sizeof(mask), &mask) < 0) {
pr_inf("affinity stressor cannot get CPU affinity, skipping the stressor\n");
return -1;
}
if (sched_setaffinity(0, sizeof(mask), &mask) < 0) {
if (errno == EPERM) {
pr_inf("affinity stressor cannot set CPU affinity, "
"process lacks privilege, skipping the stressor\n");
return -1;
}
}
return 0;
}
/*
* stress on sched_affinity()
* stress system by changing CPU affinity periodically
*/
static int stress_affinity(const args_t *args)
{
uint32_t cpu = args->instance;
const uint32_t cpus = (uint32_t)stress_get_processors_configured();
cpu_set_t mask;
do {
cpu = (g_opt_flags & OPT_FLAGS_AFFINITY_RAND) ?
(mwc32() >> 4) : cpu + 1;
cpu %= cpus;
CPU_ZERO(&mask);
CPU_SET(cpu, &mask);
if (sched_setaffinity(0, sizeof(mask), &mask) < 0) {
if (errno == EINVAL) {
/*
* We get this if CPU is offline'd,
* and since that can be dynamically
* set, we should just retry
*/
continue;
}
pr_fail("%s: failed to move to CPU %" PRIu32
", errno=%d (%s)\n",
args->name, cpu, errno, strerror(errno));
(void)shim_sched_yield();
} else {
/* Now get and check */
CPU_ZERO(&mask);
CPU_SET(cpu, &mask);
if (sched_getaffinity(0, sizeof(mask), &mask) == 0) {
if ((g_opt_flags & OPT_FLAGS_VERIFY) &&
(!CPU_ISSET(cpu, &mask)))
pr_fail("%s: failed to move "
"to CPU %" PRIu32 "\n",
args->name, cpu);
}
}
inc_counter(args);
} while (keep_stressing());
return EXIT_SUCCESS;
}
stressor_info_t stress_affinity_info = {
.stressor = stress_affinity,
.class = CLASS_SCHEDULER,
.supported = stress_affinity_supported
};
#else
stressor_info_t stress_affinity_info = {
.stressor = stress_not_implemented,
.class = CLASS_SCHEDULER
};
#endif
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