You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
74 lines
2.3 KiB
74 lines
2.3 KiB
4 months ago
|
/*
|
||
|
|
* Copyright (c) 2012 Fujitsu Ltd.
|
||
|
|
* Author: Wanlong Gao <gaowanlong@cn.fujitsu.com>
|
||
|
|
*
|
||
|
|
* 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
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include "test.h"
|
||
|
|
#include "safe_macros.h"
|
||
|
|
|
||
|
|
long tst_ncpus(void)
|
||
|
|
{
|
||
|
|
long ncpus = -1;
|
||
|
|
#ifdef _SC_NPROCESSORS_ONLN
|
||
|
|
ncpus = SAFE_SYSCONF(NULL, _SC_NPROCESSORS_ONLN);
|
||
|
|
#else
|
||
|
|
tst_brkm(TBROK, NULL, "could not determine number of CPUs online");
|
||
|
|
#endif
|
||
|
|
return ncpus;
|
||
|
|
}
|
||
|
|
|
||
|
|
long tst_ncpus_conf(void)
|
||
|
|
{
|
||
|
|
long ncpus_conf = -1;
|
||
|
|
#ifdef _SC_NPROCESSORS_CONF
|
||
|
|
ncpus_conf = SAFE_SYSCONF(NULL, _SC_NPROCESSORS_CONF);
|
||
|
|
#else
|
||
|
|
tst_brkm(TBROK, NULL, "could not determine number of CPUs configured");
|
||
|
|
#endif
|
||
|
|
return ncpus_conf;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define KERNEL_MAX "/sys/devices/system/cpu/kernel_max"
|
||
|
|
|
||
|
|
long tst_ncpus_max(void)
|
||
|
|
{
|
||
|
|
long ncpus_max = -1;
|
||
|
|
struct stat buf;
|
||
|
|
|
||
|
|
/* sched_getaffinity() and sched_setaffinity() cares about number of
|
||
|
|
* possible CPUs the OS or hardware can support, which can be larger
|
||
|
|
* than what sysconf(_SC_NPROCESSORS_CONF) currently provides
|
||
|
|
* (by enumarating /sys/devices/system/cpu/cpu* entries).
|
||
|
|
*
|
||
|
|
* Use /sys/devices/system/cpu/kernel_max, if available. This
|
||
|
|
* represents NR_CPUS-1, a compile time option which specifies
|
||
|
|
* "maximum number of CPUs which this kernel will support".
|
||
|
|
* This should provide cpu mask size large enough for any purposes. */
|
||
|
|
if (stat(KERNEL_MAX, &buf) == 0) {
|
||
|
|
SAFE_FILE_SCANF(NULL, KERNEL_MAX, "%ld", &ncpus_max);
|
||
|
|
/* this is maximum CPU index allowed by the kernel
|
||
|
|
* configuration, so # of cpus allowed by config is +1 */
|
||
|
|
ncpus_max++;
|
||
|
|
} else {
|
||
|
|
/* fall back to _SC_NPROCESSORS_CONF */
|
||
|
|
ncpus_max = tst_ncpus_conf();
|
||
|
|
}
|
||
|
|
return ncpus_max;
|
||
|
|
}
|