Skip to content
Permalink
master
Switch branches/tags
Go to file
 
 
Cannot retrieve contributors at this time
155 lines (127 sloc) 3.58 KB
/*
* Copyright (C) 2006, Intel Corporation
* Copyright (C) 2012, Neil Horman <nhorman@tuxdriver.com>
*
* This file is part of irqbalance
*
* This program file 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; version 2 of the License.
*
* 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 in a file named COPYING; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
/*
* This file tries to map numa affinity of pci devices to their interrupts
* In addition the PCI class information is used to refine the classification
* of interrupt sources
*/
#include "config.h"
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <dirent.h>
#include "irqbalance.h"
#define SYSFS_NODE_PATH "/sys/devices/system/node"
GList *numa_nodes = NULL;
static void add_one_node(int nodeid)
{
char path[PATH_MAX];
struct topo_obj *new;
new = calloc(1, sizeof(struct topo_obj));
if (!new) {
need_rebuild = 1;
return;
}
if (nodeid == NUMA_NO_NODE) {
cpus_setall(new->mask);
} else {
cpus_clear(new->mask);
sprintf(path, "%s/node%d/cpumap", SYSFS_NODE_PATH, nodeid);
process_one_line(path, get_mask_from_bitmap, &new->mask);
}
new->obj_type = OBJ_TYPE_NODE;
new->number = nodeid;
new->obj_type_list = &numa_nodes;
numa_nodes = g_list_append(numa_nodes, new);
}
void build_numa_node_list(void)
{
DIR *dir;
struct dirent *entry;
/* Add the unspecified node */
add_one_node(NUMA_NO_NODE);
if (!numa_avail)
return;
dir = opendir(SYSFS_NODE_PATH);
if (!dir)
return;
do {
entry = readdir(dir);
if (!entry)
break;
if ((entry->d_type == DT_DIR) &&
(strncmp(entry->d_name, "node", 4) == 0) &&
isdigit(entry->d_name[4])) {
add_one_node(strtoul(&entry->d_name[4], NULL, 10));
}
} while (entry);
closedir(dir);
}
void free_numa_node_list(void)
{
g_list_free_full(numa_nodes, free_cpu_topo);
numa_nodes = NULL;
}
static gint compare_node(gconstpointer a, gconstpointer b)
{
const struct topo_obj *ai = a;
const struct topo_obj *bi = b;
return (ai->number == bi->number) ? 0 : 1;
}
void connect_cpu_mem_topo(struct topo_obj *p, void *data __attribute__((unused)))
{
GList *entry;
struct topo_obj *node;
int len;
len = g_list_length(p->numa_nodes);
if (len == 0) {
return;
} else if (len > 1) {
for_each_object(p->children, connect_cpu_mem_topo, NULL);
return;
}
entry = g_list_first(p->numa_nodes);
node = entry->data;
if (p->obj_type == OBJ_TYPE_PACKAGE && !p->parent)
p->parent = node;
entry = g_list_find(node->children, p);
if (!entry)
node->children = g_list_append(node->children, p);
}
void dump_numa_node_info(struct topo_obj *d, void *unused __attribute__((unused)))
{
char buffer[4096];
log(TO_CONSOLE, LOG_INFO, "NUMA NODE NUMBER: %d\n", d->number);
cpumask_scnprintf(buffer, 4096, d->mask);
log(TO_CONSOLE, LOG_INFO, "LOCAL CPU MASK: %s\n", buffer);
log(TO_CONSOLE, LOG_INFO, "\n");
}
struct topo_obj *get_numa_node(int nodeid)
{
struct topo_obj find;
GList *entry;
find.number = numa_avail ? nodeid : NUMA_NO_NODE;
entry = g_list_find_custom(numa_nodes, &find, compare_node);
return entry ? entry->data : NULL;
}