2 * drivers/base/node.c - basic Node class support
5 #include <linux/sysdev.h>
6 #include <linux/module.h>
7 #include <linux/init.h>
9 #include <linux/node.h>
10 #include <linux/hugetlb.h>
11 #include <linux/cpumask.h>
12 #include <linux/topology.h>
13 #include <linux/nodemask.h>
15 static struct sysdev_class node_class = {
16 set_kset_name("node"),
20 static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
22 struct node *node_dev = to_node(dev);
23 cpumask_t mask = node_to_cpumask(node_dev->sysdev.id);
26 /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
27 BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
29 len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
30 len += sprintf(buf + len, "\n");
34 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
36 #define K(x) ((x) << (PAGE_SHIFT - 10))
37 static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
43 unsigned long inactive;
47 si_meminfo_node(&i, nid);
48 get_page_state_node(&ps, nid);
49 __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
51 /* Check for negative values in these approximate counters */
52 if ((long)ps.nr_dirty < 0)
54 if ((long)ps.nr_writeback < 0)
56 if ((long)ps.nr_mapped < 0)
58 if ((long)ps.nr_slab < 0)
62 "Node %d MemTotal: %8lu kB\n"
63 "Node %d MemFree: %8lu kB\n"
64 "Node %d MemUsed: %8lu kB\n"
65 "Node %d Active: %8lu kB\n"
66 "Node %d Inactive: %8lu kB\n"
67 "Node %d HighTotal: %8lu kB\n"
68 "Node %d HighFree: %8lu kB\n"
69 "Node %d LowTotal: %8lu kB\n"
70 "Node %d LowFree: %8lu kB\n"
71 "Node %d Dirty: %8lu kB\n"
72 "Node %d Writeback: %8lu kB\n"
73 "Node %d Mapped: %8lu kB\n"
74 "Node %d Slab: %8lu kB\n",
77 nid, K(i.totalram - i.freeram),
82 nid, K(i.totalram - i.totalhigh),
83 nid, K(i.freeram - i.freehigh),
85 nid, K(ps.nr_writeback),
88 n += hugetlb_report_node_meminfo(nid, buf + n);
93 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
95 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
97 unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
98 unsigned long local_node, other_node;
100 pg_data_t *pg = NODE_DATA(dev->id);
107 for (i = 0; i < MAX_NR_ZONES; i++) {
108 struct zone *z = &pg->node_zones[i];
109 for_each_online_cpu(cpu) {
110 struct per_cpu_pageset *ps = zone_pcp(z,cpu);
111 numa_hit += ps->numa_hit;
112 numa_miss += ps->numa_miss;
113 numa_foreign += ps->numa_foreign;
114 interleave_hit += ps->interleave_hit;
115 local_node += ps->local_node;
116 other_node += ps->other_node;
123 "interleave_hit %lu\n"
133 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
135 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
141 /* buf currently PAGE_SIZE, need ~4 chars per node */
142 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
144 for_each_online_node(i)
145 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
147 len += sprintf(buf + len, "\n");
150 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
154 * register_node - Setup a driverfs device for a node.
155 * @num - Node number to use when creating the device.
157 * Initialize and register the node device.
159 int register_node(struct node *node, int num, struct node *parent)
163 node->sysdev.id = num;
164 node->sysdev.cls = &node_class;
165 error = sysdev_register(&node->sysdev);
168 sysdev_create_file(&node->sysdev, &attr_cpumap);
169 sysdev_create_file(&node->sysdev, &attr_meminfo);
170 sysdev_create_file(&node->sysdev, &attr_numastat);
171 sysdev_create_file(&node->sysdev, &attr_distance);
177 * unregister_node - unregister a node device
178 * @node: node going away
180 * Unregisters a node device @node. All the devices on the node must be
181 * unregistered before calling this function.
183 void unregister_node(struct node *node)
185 sysdev_remove_file(&node->sysdev, &attr_cpumap);
186 sysdev_remove_file(&node->sysdev, &attr_meminfo);
187 sysdev_remove_file(&node->sysdev, &attr_numastat);
188 sysdev_remove_file(&node->sysdev, &attr_distance);
190 sysdev_unregister(&node->sysdev);
193 static int __init register_node_type(void)
195 return sysdev_class_register(&node_class);
197 postcore_initcall(register_node_type);