projects/linux·blob v2.6.27 · refs

350 lines · 9.0 KiB

1/*
2 * drivers/base/node.c - basic Node class support
3 */
4
5#include <linux/sysdev.h>
6#include <linux/module.h>
7#include <linux/init.h>
8#include <linux/mm.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>
16
17static struct sysdev_class node_class = {
18 .name = "node",
19};
20
21
22static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
23{
24 struct node *node_dev = to_node(dev);
25 node_to_cpumask_ptr(mask, node_dev->sysdev.id);
26 int len;
27
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));
30
31 len = type?
32 cpulist_scnprintf(buf, PAGE_SIZE-2, *mask):
33 cpumask_scnprintf(buf, PAGE_SIZE-2, *mask);
34 buf[len++] = '\n';
35 buf[len] = '\0';
36 return len;
37}
38
39static inline ssize_t node_read_cpumask(struct sys_device *dev,
40 struct sysdev_attribute *attr, char *buf)
41{
42 return node_read_cpumap(dev, 0, buf);
43}
44static inline ssize_t node_read_cpulist(struct sys_device *dev,
45 struct sysdev_attribute *attr, char *buf)
46{
47 return node_read_cpumap(dev, 1, buf);
48}
49
50static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
51static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
52
53#define K(x) ((x) << (PAGE_SHIFT - 10))
54static ssize_t node_read_meminfo(struct sys_device * dev,
55 struct sysdev_attribute *attr, char * buf)
56{
57 int n;
58 int nid = dev->id;
59 struct sysinfo i;
60
61 si_meminfo_node(&i, nid);
62
63 n = sprintf(buf, "\n"
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#ifdef CONFIG_HIGHMEM
70 "Node %d HighTotal: %8lu kB\n"
71 "Node %d HighFree: %8lu kB\n"
72 "Node %d LowTotal: %8lu kB\n"
73 "Node %d LowFree: %8lu kB\n"
74#endif
75 "Node %d Dirty: %8lu kB\n"
76 "Node %d Writeback: %8lu kB\n"
77 "Node %d FilePages: %8lu kB\n"
78 "Node %d Mapped: %8lu kB\n"
79 "Node %d AnonPages: %8lu kB\n"
80 "Node %d PageTables: %8lu kB\n"
81 "Node %d NFS_Unstable: %8lu kB\n"
82 "Node %d Bounce: %8lu kB\n"
83 "Node %d WritebackTmp: %8lu kB\n"
84 "Node %d Slab: %8lu kB\n"
85 "Node %d SReclaimable: %8lu kB\n"
86 "Node %d SUnreclaim: %8lu kB\n",
87 nid, K(i.totalram),
88 nid, K(i.freeram),
89 nid, K(i.totalram - i.freeram),
90 nid, K(node_page_state(nid, NR_ACTIVE)),
91 nid, K(node_page_state(nid, NR_INACTIVE)),
92#ifdef CONFIG_HIGHMEM
93 nid, K(i.totalhigh),
94 nid, K(i.freehigh),
95 nid, K(i.totalram - i.totalhigh),
96 nid, K(i.freeram - i.freehigh),
97#endif
98 nid, K(node_page_state(nid, NR_FILE_DIRTY)),
99 nid, K(node_page_state(nid, NR_WRITEBACK)),
100 nid, K(node_page_state(nid, NR_FILE_PAGES)),
101 nid, K(node_page_state(nid, NR_FILE_MAPPED)),
102 nid, K(node_page_state(nid, NR_ANON_PAGES)),
103 nid, K(node_page_state(nid, NR_PAGETABLE)),
104 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
105 nid, K(node_page_state(nid, NR_BOUNCE)),
106 nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
107 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
108 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
109 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
110 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
111 n += hugetlb_report_node_meminfo(nid, buf + n);
112 return n;
113}
114
115#undef K
116static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
117
118static ssize_t node_read_numastat(struct sys_device * dev,
119 struct sysdev_attribute *attr, char * buf)
120{
121 return sprintf(buf,
122 "numa_hit %lu\n"
123 "numa_miss %lu\n"
124 "numa_foreign %lu\n"
125 "interleave_hit %lu\n"
126 "local_node %lu\n"
127 "other_node %lu\n",
128 node_page_state(dev->id, NUMA_HIT),
129 node_page_state(dev->id, NUMA_MISS),
130 node_page_state(dev->id, NUMA_FOREIGN),
131 node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
132 node_page_state(dev->id, NUMA_LOCAL),
133 node_page_state(dev->id, NUMA_OTHER));
134}
135static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
136
137static ssize_t node_read_distance(struct sys_device * dev,
138 struct sysdev_attribute *attr, char * buf)
139{
140 int nid = dev->id;
141 int len = 0;
142 int i;
143
144 /* buf currently PAGE_SIZE, need ~4 chars per node */
145 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
146
147 for_each_online_node(i)
148 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
149
150 len += sprintf(buf + len, "\n");
151 return len;
152}
153static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
154
155
156/*
157 * register_node - Setup a sysfs device for a node.
158 * @num - Node number to use when creating the device.
159 *
160 * Initialize and register the node device.
161 */
162int register_node(struct node *node, int num, struct node *parent)
163{
164 int error;
165
166 node->sysdev.id = num;
167 node->sysdev.cls = &node_class;
168 error = sysdev_register(&node->sysdev);
169
170 if (!error){
171 sysdev_create_file(&node->sysdev, &attr_cpumap);
172 sysdev_create_file(&node->sysdev, &attr_cpulist);
173 sysdev_create_file(&node->sysdev, &attr_meminfo);
174 sysdev_create_file(&node->sysdev, &attr_numastat);
175 sysdev_create_file(&node->sysdev, &attr_distance);
176 }
177 return error;
178}
179
180/**
181 * unregister_node - unregister a node device
182 * @node: node going away
183 *
184 * Unregisters a node device @node. All the devices on the node must be
185 * unregistered before calling this function.
186 */
187void unregister_node(struct node *node)
188{
189 sysdev_remove_file(&node->sysdev, &attr_cpumap);
190 sysdev_remove_file(&node->sysdev, &attr_cpulist);
191 sysdev_remove_file(&node->sysdev, &attr_meminfo);
192 sysdev_remove_file(&node->sysdev, &attr_numastat);
193 sysdev_remove_file(&node->sysdev, &attr_distance);
194
195 sysdev_unregister(&node->sysdev);
196}
197
198struct node node_devices[MAX_NUMNODES];
199
200/*
201 * register cpu under node
202 */
203int register_cpu_under_node(unsigned int cpu, unsigned int nid)
204{
205 if (node_online(nid)) {
206 struct sys_device *obj = get_cpu_sysdev(cpu);
207 if (!obj)
208 return 0;
209 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
210 &obj->kobj,
211 kobject_name(&obj->kobj));
212 }
213
214 return 0;
215}
216
217int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
218{
219 if (node_online(nid)) {
220 struct sys_device *obj = get_cpu_sysdev(cpu);
221 if (obj)
222 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
223 kobject_name(&obj->kobj));
224 }
225 return 0;
226}
227
228int register_one_node(int nid)
229{
230 int error = 0;
231 int cpu;
232
233 if (node_online(nid)) {
234 int p_node = parent_node(nid);
235 struct node *parent = NULL;
236
237 if (p_node != nid)
238 parent = &node_devices[p_node];
239
240 error = register_node(&node_devices[nid], nid, parent);
241
242 /* link cpu under this node */
243 for_each_present_cpu(cpu) {
244 if (cpu_to_node(cpu) == nid)
245 register_cpu_under_node(cpu, nid);
246 }
247 }
248
249 return error;
250
251}
252
253void unregister_one_node(int nid)
254{
255 unregister_node(&node_devices[nid]);
256}
257
258/*
259 * node states attributes
260 */
261
262static ssize_t print_nodes_state(enum node_states state, char *buf)
263{
264 int n;
265
266 n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
267 if (n > 0 && PAGE_SIZE > n + 1) {
268 *(buf + n++) = '\n';
269 *(buf + n++) = '\0';
270 }
271 return n;
272}
273
274static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
275{
276 return print_nodes_state(N_POSSIBLE, buf);
277}
278
279static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
280{
281 return print_nodes_state(N_ONLINE, buf);
282}
283
284static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
285 char *buf)
286{
287 return print_nodes_state(N_NORMAL_MEMORY, buf);
288}
289
290static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
291{
292 return print_nodes_state(N_CPU, buf);
293}
294
295static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
296static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
297static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
298 NULL);
299static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
300
301#ifdef CONFIG_HIGHMEM
302static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
303 char *buf)
304{
305 return print_nodes_state(N_HIGH_MEMORY, buf);
306}
307
308static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
309 NULL);
310#endif
311
312struct sysdev_class_attribute *node_state_attr[] = {
313 &attr_possible,
314 &attr_online,
315 &attr_has_normal_memory,
316#ifdef CONFIG_HIGHMEM
317 &attr_has_high_memory,
318#endif
319 &attr_has_cpu,
320};
321
322static int node_states_init(void)
323{
324 int i;
325 int err = 0;
326
327 for (i = 0; i < NR_NODE_STATES; i++) {
328 int ret;
329 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
330 if (!err)
331 err = ret;
332 }
333 return err;
334}
335
336static int __init register_node_type(void)
337{
338 int ret;
339
340 ret = sysdev_class_register(&node_class);
341 if (!ret)
342 ret = node_states_init();
343
344 /*
345 * Note: we're not going to unregister the node class if we fail
346 * to register the node state class attribute files.
347 */
348 return ret;
349}
350postcore_initcall(register_node_type);