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74 lines
2.3 KiB
74 lines
2.3 KiB
/*
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* Copyright (c) 2012 Fujitsu Ltd.
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* Author: Wanlong Gao <gaowanlong@cn.fujitsu.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdlib.h>
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#include <unistd.h>
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#include "test.h"
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#include "safe_macros.h"
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long tst_ncpus(void)
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{
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long ncpus = -1;
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#ifdef _SC_NPROCESSORS_ONLN
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ncpus = SAFE_SYSCONF(NULL, _SC_NPROCESSORS_ONLN);
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#else
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tst_brkm(TBROK, NULL, "could not determine number of CPUs online");
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#endif
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return ncpus;
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}
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long tst_ncpus_conf(void)
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{
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long ncpus_conf = -1;
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#ifdef _SC_NPROCESSORS_CONF
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ncpus_conf = SAFE_SYSCONF(NULL, _SC_NPROCESSORS_CONF);
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#else
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tst_brkm(TBROK, NULL, "could not determine number of CPUs configured");
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#endif
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return ncpus_conf;
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}
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#define KERNEL_MAX "/sys/devices/system/cpu/kernel_max"
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long tst_ncpus_max(void)
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{
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long ncpus_max = -1;
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struct stat buf;
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/* sched_getaffinity() and sched_setaffinity() cares about number of
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* possible CPUs the OS or hardware can support, which can be larger
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* than what sysconf(_SC_NPROCESSORS_CONF) currently provides
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* (by enumarating /sys/devices/system/cpu/cpu* entries).
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*
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* Use /sys/devices/system/cpu/kernel_max, if available. This
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* represents NR_CPUS-1, a compile time option which specifies
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* "maximum number of CPUs which this kernel will support".
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* This should provide cpu mask size large enough for any purposes. */
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if (stat(KERNEL_MAX, &buf) == 0) {
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SAFE_FILE_SCANF(NULL, KERNEL_MAX, "%ld", &ncpus_max);
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/* this is maximum CPU index allowed by the kernel
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* configuration, so # of cpus allowed by config is +1 */
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ncpus_max++;
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} else {
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/* fall back to _SC_NPROCESSORS_CONF */
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ncpus_max = tst_ncpus_conf();
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}
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return ncpus_max;
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}
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