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>
14 #include <linux/cpu.h>
15 #include <linux/device.h>
17 static struct sysdev_class node_class = {
22 static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
24 struct node *node_dev = to_node(dev);
25 node_to_cpumask_ptr(mask, node_dev->sysdev.id);
28 /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
29 BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
32 cpulist_scnprintf(buf, PAGE_SIZE-2, *mask):
33 cpumask_scnprintf(buf, PAGE_SIZE-2, *mask);
39 static inline ssize_t node_read_cpumask(struct sys_device *dev,
40 struct sysdev_attribute *attr, char *buf)
42 return node_read_cpumap(dev, 0, buf);
44 static inline ssize_t node_read_cpulist(struct sys_device *dev,
45 struct sysdev_attribute *attr, char *buf)
47 return node_read_cpumap(dev, 1, buf);
50 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
51 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
53 #define K(x) ((x) << (PAGE_SHIFT - 10))
54 static ssize_t node_read_meminfo(struct sys_device * dev,
55 struct sysdev_attribute *attr, char * buf)
61 si_meminfo_node(&i, nid);
64 "Node %d MemTotal: %8lu kB\n"
65 "Node %d MemFree: %8lu kB\n"
66 "Node %d MemUsed: %8lu kB\n"
67 "Node %d Active: %8lu kB\n"
68 "Node %d Inactive: %8lu kB\n"
69 "Node %d Active(anon): %8lu kB\n"
70 "Node %d Inactive(anon): %8lu kB\n"
71 "Node %d Active(file): %8lu kB\n"
72 "Node %d Inactive(file): %8lu kB\n"
73 #ifdef CONFIG_UNEVICTABLE_LRU
74 "Node %d Unevictable: %8lu kB\n"
75 "Node %d Mlocked: %8lu kB\n"
78 "Node %d HighTotal: %8lu kB\n"
79 "Node %d HighFree: %8lu kB\n"
80 "Node %d LowTotal: %8lu kB\n"
81 "Node %d LowFree: %8lu kB\n"
83 "Node %d Dirty: %8lu kB\n"
84 "Node %d Writeback: %8lu kB\n"
85 "Node %d FilePages: %8lu kB\n"
86 "Node %d Mapped: %8lu kB\n"
87 "Node %d AnonPages: %8lu kB\n"
88 "Node %d PageTables: %8lu kB\n"
89 "Node %d NFS_Unstable: %8lu kB\n"
90 "Node %d Bounce: %8lu kB\n"
91 "Node %d WritebackTmp: %8lu kB\n"
92 "Node %d Slab: %8lu kB\n"
93 "Node %d SReclaimable: %8lu kB\n"
94 "Node %d SUnreclaim: %8lu kB\n",
97 nid, K(i.totalram - i.freeram),
98 nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
99 node_page_state(nid, NR_ACTIVE_FILE)),
100 nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
101 node_page_state(nid, NR_INACTIVE_FILE)),
102 nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
103 nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
104 nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
105 nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
106 #ifdef CONFIG_UNEVICTABLE_LRU
107 nid, K(node_page_state(nid, NR_UNEVICTABLE)),
108 nid, K(node_page_state(nid, NR_MLOCK)),
110 #ifdef CONFIG_HIGHMEM
113 nid, K(i.totalram - i.totalhigh),
114 nid, K(i.freeram - i.freehigh),
116 nid, K(node_page_state(nid, NR_FILE_DIRTY)),
117 nid, K(node_page_state(nid, NR_WRITEBACK)),
118 nid, K(node_page_state(nid, NR_FILE_PAGES)),
119 nid, K(node_page_state(nid, NR_FILE_MAPPED)),
120 nid, K(node_page_state(nid, NR_ANON_PAGES)),
121 nid, K(node_page_state(nid, NR_PAGETABLE)),
122 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
123 nid, K(node_page_state(nid, NR_BOUNCE)),
124 nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
125 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
126 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
127 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
128 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
129 n += hugetlb_report_node_meminfo(nid, buf + n);
134 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
136 static ssize_t node_read_numastat(struct sys_device * dev,
137 struct sysdev_attribute *attr, char * buf)
143 "interleave_hit %lu\n"
146 node_page_state(dev->id, NUMA_HIT),
147 node_page_state(dev->id, NUMA_MISS),
148 node_page_state(dev->id, NUMA_FOREIGN),
149 node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
150 node_page_state(dev->id, NUMA_LOCAL),
151 node_page_state(dev->id, NUMA_OTHER));
153 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
155 static ssize_t node_read_distance(struct sys_device * dev,
156 struct sysdev_attribute *attr, char * buf)
162 /* buf currently PAGE_SIZE, need ~4 chars per node */
163 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
165 for_each_online_node(i)
166 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
168 len += sprintf(buf + len, "\n");
171 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
175 * register_node - Setup a sysfs device for a node.
176 * @num - Node number to use when creating the device.
178 * Initialize and register the node device.
180 int register_node(struct node *node, int num, struct node *parent)
184 node->sysdev.id = num;
185 node->sysdev.cls = &node_class;
186 error = sysdev_register(&node->sysdev);
189 sysdev_create_file(&node->sysdev, &attr_cpumap);
190 sysdev_create_file(&node->sysdev, &attr_cpulist);
191 sysdev_create_file(&node->sysdev, &attr_meminfo);
192 sysdev_create_file(&node->sysdev, &attr_numastat);
193 sysdev_create_file(&node->sysdev, &attr_distance);
199 * unregister_node - unregister a node device
200 * @node: node going away
202 * Unregisters a node device @node. All the devices on the node must be
203 * unregistered before calling this function.
205 void unregister_node(struct node *node)
207 sysdev_remove_file(&node->sysdev, &attr_cpumap);
208 sysdev_remove_file(&node->sysdev, &attr_cpulist);
209 sysdev_remove_file(&node->sysdev, &attr_meminfo);
210 sysdev_remove_file(&node->sysdev, &attr_numastat);
211 sysdev_remove_file(&node->sysdev, &attr_distance);
213 sysdev_unregister(&node->sysdev);
216 struct node node_devices[MAX_NUMNODES];
219 * register cpu under node
221 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
223 if (node_online(nid)) {
224 struct sys_device *obj = get_cpu_sysdev(cpu);
227 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
229 kobject_name(&obj->kobj));
235 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
237 if (node_online(nid)) {
238 struct sys_device *obj = get_cpu_sysdev(cpu);
240 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
241 kobject_name(&obj->kobj));
246 int register_one_node(int nid)
251 if (node_online(nid)) {
252 int p_node = parent_node(nid);
253 struct node *parent = NULL;
256 parent = &node_devices[p_node];
258 error = register_node(&node_devices[nid], nid, parent);
260 /* link cpu under this node */
261 for_each_present_cpu(cpu) {
262 if (cpu_to_node(cpu) == nid)
263 register_cpu_under_node(cpu, nid);
271 void unregister_one_node(int nid)
273 unregister_node(&node_devices[nid]);
277 * node states attributes
280 static ssize_t print_nodes_state(enum node_states state, char *buf)
284 n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
285 if (n > 0 && PAGE_SIZE > n + 1) {
292 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
294 return print_nodes_state(N_POSSIBLE, buf);
297 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
299 return print_nodes_state(N_ONLINE, buf);
302 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
305 return print_nodes_state(N_NORMAL_MEMORY, buf);
308 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
310 return print_nodes_state(N_CPU, buf);
313 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
314 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
315 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
317 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
319 #ifdef CONFIG_HIGHMEM
320 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
323 return print_nodes_state(N_HIGH_MEMORY, buf);
326 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
330 struct sysdev_class_attribute *node_state_attr[] = {
333 &attr_has_normal_memory,
334 #ifdef CONFIG_HIGHMEM
335 &attr_has_high_memory,
340 static int node_states_init(void)
345 for (i = 0; i < NR_NODE_STATES; i++) {
347 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
354 static int __init register_node_type(void)
358 ret = sysdev_class_register(&node_class);
360 ret = node_states_init();
363 * Note: we're not going to unregister the node class if we fail
364 * to register the node state class attribute files.
368 postcore_initcall(register_node_type);