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https://gitlab.isc.org/isc-projects/bind9
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f00f521e9c
IBM power architecture has L1 cache line size equal to 128. Take advantage of that on that architecture, do not force more common value of 64. When it is possible to detect higher value, use that value instead. Keep the default to be 64.
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* SPDX-License-Identifier: MPL-2.0
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, you can obtain one at https://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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#include <inttypes.h>
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#include <isc/os.h>
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#include <isc/types.h>
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#include <isc/util.h>
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#include "os_p.h"
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static unsigned int isc__os_ncpus = 0;
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static unsigned long isc__os_cacheline = ISC_OS_CACHELINE_SIZE;
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#ifdef HAVE_SYSCONF
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#include <unistd.h>
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static inline long
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sysconf_ncpus(void) {
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#if defined(_SC_NPROCESSORS_ONLN)
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return (sysconf((_SC_NPROCESSORS_ONLN)));
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#elif defined(_SC_NPROC_ONLN)
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return (sysconf((_SC_NPROC_ONLN)));
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#else /* if defined(_SC_NPROCESSORS_ONLN) */
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return (0);
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#endif /* if defined(_SC_NPROCESSORS_ONLN) */
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}
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#endif /* HAVE_SYSCONF */
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#if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME)
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#include <sys/param.h> /* for NetBSD */
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#include <sys/sysctl.h>
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#include <sys/types.h> /* for FreeBSD */
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static int
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sysctl_ncpus(void) {
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int ncpu, result;
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size_t len;
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len = sizeof(ncpu);
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result = sysctlbyname("hw.ncpu", &ncpu, &len, 0, 0);
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if (result != -1) {
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return (ncpu);
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}
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return (0);
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}
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#endif /* if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME) */
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static void
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ncpus_initialize(void) {
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#if defined(HAVE_SYSCONF)
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isc__os_ncpus = sysconf_ncpus();
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#endif /* if defined(HAVE_SYSCONF) */
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#if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME)
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if (isc__os_ncpus <= 0) {
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isc__os_ncpus = sysctl_ncpus();
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}
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#endif /* if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME) */
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if (isc__os_ncpus == 0) {
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isc__os_ncpus = 1;
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}
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}
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unsigned int
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isc_os_ncpus(void) {
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return (isc__os_ncpus);
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}
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unsigned long
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isc_os_cacheline(void) {
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return (isc__os_cacheline);
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}
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void
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isc__os_initialize(void) {
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ncpus_initialize();
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#if defined(HAVE_SYSCONF) && defined(_SC_LEVEL1_DCACHE_LINESIZE)
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long s = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
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if (s > 0 && (unsigned long)s > isc__os_cacheline) {
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isc__os_cacheline = s;
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}
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#endif
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}
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void
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isc__os_shutdown(void) {
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/* empty, but defined for completeness */;
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}
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