157 lines
3.6 KiB
C
157 lines
3.6 KiB
C
/*
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* Copyright (C) 2006, Intel Corporation
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* Copyright (C) 2012, Neil Horman <nhorman@tuxdriver.com>
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*
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* This file is part of irqbalance
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*
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* This program file is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* 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 in a file named COPYING; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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/*
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* This file tries to map numa affinity of pci devices to their interrupts
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* In addition the PCI class information is used to refine the classification
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* of interrupt sources
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*/
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#include "config.h"
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include "irqbalance.h"
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#define SYSFS_NODE_PATH "/sys/devices/system/node"
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GList *numa_nodes = NULL;
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static void add_one_node(int nodeid)
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{
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char path[PATH_MAX];
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struct topo_obj *new;
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new = calloc(1, sizeof(struct topo_obj));
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if (!new) {
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need_rebuild = 1;
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return;
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}
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if (nodeid == NUMA_NO_NODE) {
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cpus_setall(new->mask);
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} else {
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cpus_clear(new->mask);
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sprintf(path, "%s/node%d/cpumap", SYSFS_NODE_PATH, nodeid);
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process_one_line(path, get_mask_from_bitmap, &new->mask);
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}
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new->obj_type = OBJ_TYPE_NODE;
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new->number = nodeid;
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new->obj_type_list = &numa_nodes;
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new->max_load = 0;
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numa_nodes = g_list_append(numa_nodes, new);
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}
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void build_numa_node_list(void)
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{
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DIR *dir;
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struct dirent *entry;
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/* Add the unspecified node */
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add_one_node(NUMA_NO_NODE);
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if (!numa_avail)
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return;
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dir = opendir(SYSFS_NODE_PATH);
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if (!dir)
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return;
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do {
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entry = readdir(dir);
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if (!entry)
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break;
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if ((entry->d_type == DT_DIR) &&
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(strncmp(entry->d_name, "node", 4) == 0) &&
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isdigit(entry->d_name[4])) {
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add_one_node(strtoul(&entry->d_name[4], NULL, 10));
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}
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} while (entry);
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closedir(dir);
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}
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void free_numa_node_list(void)
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{
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g_list_free_full(numa_nodes, free_cpu_topo);
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numa_nodes = NULL;
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}
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static gint compare_node(gconstpointer a, gconstpointer b)
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{
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const struct topo_obj *ai = a;
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const struct topo_obj *bi = b;
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return (ai->number == bi->number) ? 0 : 1;
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}
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void connect_cpu_mem_topo(struct topo_obj *p, void *data __attribute__((unused)))
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{
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GList *entry;
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struct topo_obj *node;
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int len;
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len = g_list_length(p->numa_nodes);
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if (len == 0) {
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return;
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} else if (len > 1) {
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for_each_object(p->children, connect_cpu_mem_topo, NULL);
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return;
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}
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entry = g_list_first(p->numa_nodes);
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node = entry->data;
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if (p->obj_type == OBJ_TYPE_PACKAGE && !p->parent)
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p->parent = node;
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entry = g_list_find(node->children, p);
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if (!entry)
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node->children = g_list_append(node->children, p);
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}
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void dump_numa_node_info(struct topo_obj *d, void *unused __attribute__((unused)))
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{
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char buffer[4096];
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log(TO_CONSOLE, LOG_INFO, "NUMA NODE NUMBER: %d\n", d->number);
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cpumask_scnprintf(buffer, 4096, d->mask);
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log(TO_CONSOLE, LOG_INFO, "LOCAL CPU MASK: %s\n", buffer);
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log(TO_CONSOLE, LOG_INFO, "\n");
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}
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struct topo_obj *get_numa_node(int nodeid)
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{
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struct topo_obj find;
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GList *entry;
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find.number = numa_avail ? nodeid : NUMA_NO_NODE;
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entry = g_list_find_custom(numa_nodes, &find, compare_node);
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return entry ? entry->data : NULL;
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}
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