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/*
* Copyright (C) 2013-2017 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"
static const char *option = "taskset";
#if defined(__linux__)
/*
* check_cpu_affinity_range()
* @max_cpus: maximum cpus allowed, 0..N-1
* @cpu: cpu number to check
*/
static void check_cpu_affinity_range(
const int32_t max_cpus,
const int32_t cpu)
{
if ((cpu < 0) || ((max_cpus != -1) && (cpu >= max_cpus))) {
fprintf(stderr, "%s: invalid range, %" PRId32 " is not allowed, "
"allowed range: 0 to %" PRId32 "\n", option,
cpu, max_cpus - 1);
exit(EXIT_FAILURE);
}
}
/*
* get_cpu()
* @str: parse string containing decimal CPU number
*
* Returns: cpu number, or exits the program on invalid number in str
*/
static int get_cpu(char *const str)
{
int val;
if (sscanf(str, "%d", &val) != 1) {
fprintf(stderr, "%s: invalid number '%s'\n", option, str);
exit(EXIT_FAILURE);
}
return val;
}
/*
* set_cpu_affinity()
* @arg: list of CPUs to set affinity to, comma separated
*
* Returns: 0 - OK
*/
int set_cpu_affinity(char *const arg)
{
cpu_set_t set;
char *str, *token;
int32_t max_cpus = stress_get_processors_configured();
CPU_ZERO(&set);
for (str = arg; (token = strtok(str, ",")) != NULL; str = NULL) {
int i, lo, hi;
char *ptr = strstr(token, "-");
hi = lo = get_cpu(token);
if (ptr) {
ptr++;
if (*ptr)
hi = get_cpu(ptr);
else {
fprintf(stderr, "%s: expecting number following "
"'-' in '%s'\n", option, token);
exit(EXIT_FAILURE);
}
if (hi <= lo) {
fprintf(stderr, "%s: invalid range in '%s' "
"(end value must be larger than "
"start value\n", option, token);
exit(EXIT_FAILURE);
}
}
check_cpu_affinity_range(max_cpus, lo);
check_cpu_affinity_range(max_cpus, hi);
for (i = lo; i <= hi; i++)
CPU_SET(i, &set);
}
if (sched_setaffinity(getpid(), sizeof(set), &set) < 0) {
pr_err(stderr, "%s: cannot set CPU affinity, errno=%d (%s)\n",
option, errno, strerror(errno));
exit(EXIT_FAILURE);
}
return 0;
}
#else
int set_cpu_affinity(char *const arg)
{
(void)arg;
fprintf(stderr, "%s: setting CPU affinity not supported\n", option);
exit(EXIT_FAILURE);
}
#endif
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