afdd4690fc
This just updates the copyright dates in the documents where I was already represented. Others are unchanged. Signed-off-by: Jim Warner <james.warner@comcast.net>
114 lines
3.8 KiB
C
114 lines
3.8 KiB
C
/*
|
|
* NUMA node support for <PIDS> & <STAT> interfaces
|
|
* Copyright 2017-2022 by James C. Warmer
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef NUMA_DISABLE
|
|
#include <dlfcn.h>
|
|
#endif
|
|
#include <stdlib.h>
|
|
|
|
#include "numa.h"
|
|
|
|
/*
|
|
* We're structured so that if numa_init() is NOT called or that ./configure |
|
|
* --disable-numa WAS specified, then calls to both of our primary functions |
|
|
* of numa_max_node() plus numa_node_of_cpu() would always return a negative |
|
|
* 1 which signifies that NUMA information isn't available. That ./configure |
|
|
* option might be required when libdl.so (necessary for dlopen) is missing. |
|
|
*/
|
|
|
|
|
|
/* ------------------------------------------------------------------------- +
|
|
a strictly development #define, existing specifically for the top program |
|
|
( and it has no affect if ./configure --disable-numa has been specified ) | */
|
|
//#define PRETEND_NUMA // pretend there are 3 'discontiguous' numa nodes |
|
|
// ------------------------------------------------------------------------- +
|
|
|
|
|
|
static int null_max_node (void) { return -1; }
|
|
static int null_node_of_cpu (int n) { (void)n; return -1; }
|
|
|
|
|
|
#ifndef NUMA_DISABLE
|
|
#ifdef PRETEND_NUMA
|
|
static int fake_max_node (void) { return 3; }
|
|
static int fake_node_of_cpu (int n) { return (1 == (n % 4)) ? 0 : (n % 4); }
|
|
#endif
|
|
#endif
|
|
|
|
|
|
#ifndef NUMA_DISABLE
|
|
static void *libnuma_handle;
|
|
#endif
|
|
int (*numa_max_node) (void) = null_max_node;
|
|
int (*numa_node_of_cpu) (int) = null_node_of_cpu;
|
|
|
|
|
|
void numa_init (void) {
|
|
static int initialized;
|
|
|
|
if (initialized)
|
|
return;
|
|
|
|
#ifndef NUMA_DISABLE
|
|
#ifndef PRETEND_NUMA
|
|
// we'll try for the most recent version, then a version we know works...
|
|
if ((libnuma_handle = dlopen("libnuma.so", RTLD_LAZY))
|
|
|| (libnuma_handle = dlopen("libnuma.so.1", RTLD_LAZY))) {
|
|
numa_max_node = dlsym(libnuma_handle, "numa_max_node");
|
|
numa_node_of_cpu = dlsym(libnuma_handle, "numa_node_of_cpu");
|
|
if (numa_max_node == NULL
|
|
|| (numa_node_of_cpu == NULL)) {
|
|
// this dlclose is safe - we've yet to call numa_node_of_cpu
|
|
// ( there's one other dlclose which has now been disabled )
|
|
dlclose(libnuma_handle);
|
|
libnuma_handle = NULL;
|
|
numa_max_node = null_max_node;
|
|
numa_node_of_cpu = null_node_of_cpu;
|
|
}
|
|
}
|
|
#else
|
|
libnuma_handle = (void *)-1;
|
|
numa_max_node = fake_max_node;
|
|
numa_node_of_cpu = fake_node_of_cpu;
|
|
#endif
|
|
#endif
|
|
initialized = 1;
|
|
} // end: numa_init
|
|
|
|
|
|
void numa_uninit (void) {
|
|
#ifndef PRETEND_NUMA
|
|
/* note: we'll skip a dlcose() to avoid the following libnuma memory
|
|
* leak which is triggered after a call to numa_node_of_cpu():
|
|
* ==1234== LEAK SUMMARY:
|
|
* ==1234== definitely lost: 512 bytes in 1 blocks
|
|
* ==1234== indirectly lost: 48 bytes in 2 blocks
|
|
* ==1234== ...
|
|
* [ thanks very much libnuma for all the pains you have caused us ]
|
|
*/
|
|
// if (libnuma_handle)
|
|
// dlclose(libnuma_handle);
|
|
#endif
|
|
} // end: numa_uninit
|
|
|
|
|
|
#if defined(PRETEND_NUMA) && defined(NUMA_DISABLE)
|
|
# warning 'PRETEND_NUMA' ignored, 'NUMA_DISABLE' is active
|
|
#endif
|