Unevictable LRU Page Statistics
[linux-2.6.git] / drivers / base / node.c
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
17 static struct sysdev_class node_class = {
18         .name = "node",
19 };
20
21
22 static 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
39 static 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 }
44 static 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
50 static SYSDEV_ATTR(cpumap,  S_IRUGO, node_read_cpumask, NULL);
51 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
52
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)
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                        "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 Noreclaim:      %8lu kB\n"
75 #endif
76 #ifdef CONFIG_HIGHMEM
77                        "Node %d HighTotal:      %8lu kB\n"
78                        "Node %d HighFree:       %8lu kB\n"
79                        "Node %d LowTotal:       %8lu kB\n"
80                        "Node %d LowFree:        %8lu kB\n"
81 #endif
82                        "Node %d Dirty:          %8lu kB\n"
83                        "Node %d Writeback:      %8lu kB\n"
84                        "Node %d FilePages:      %8lu kB\n"
85                        "Node %d Mapped:         %8lu kB\n"
86                        "Node %d AnonPages:      %8lu kB\n"
87                        "Node %d PageTables:     %8lu kB\n"
88                        "Node %d NFS_Unstable:   %8lu kB\n"
89                        "Node %d Bounce:         %8lu kB\n"
90                        "Node %d WritebackTmp:   %8lu kB\n"
91                        "Node %d Slab:           %8lu kB\n"
92                        "Node %d SReclaimable:   %8lu kB\n"
93                        "Node %d SUnreclaim:     %8lu kB\n",
94                        nid, K(i.totalram),
95                        nid, K(i.freeram),
96                        nid, K(i.totalram - i.freeram),
97                        nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
98                                 node_page_state(nid, NR_ACTIVE_FILE)),
99                        nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
100                                 node_page_state(nid, NR_INACTIVE_FILE)),
101                        nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
102                        nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
103                        nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
104                        nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
105 #ifdef CONFIG_UNEVICTABLE_LRU
106                        nid, K(node_page_state(nid, NR_UNEVICTABLE)),
107 #endif
108 #ifdef CONFIG_HIGHMEM
109                        nid, K(i.totalhigh),
110                        nid, K(i.freehigh),
111                        nid, K(i.totalram - i.totalhigh),
112                        nid, K(i.freeram - i.freehigh),
113 #endif
114                        nid, K(node_page_state(nid, NR_FILE_DIRTY)),
115                        nid, K(node_page_state(nid, NR_WRITEBACK)),
116                        nid, K(node_page_state(nid, NR_FILE_PAGES)),
117                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
118                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
119                        nid, K(node_page_state(nid, NR_PAGETABLE)),
120                        nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
121                        nid, K(node_page_state(nid, NR_BOUNCE)),
122                        nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
123                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
124                                 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
125                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
126                        nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
127         n += hugetlb_report_node_meminfo(nid, buf + n);
128         return n;
129 }
130
131 #undef K
132 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
133
134 static ssize_t node_read_numastat(struct sys_device * dev,
135                                 struct sysdev_attribute *attr, char * buf)
136 {
137         return sprintf(buf,
138                        "numa_hit %lu\n"
139                        "numa_miss %lu\n"
140                        "numa_foreign %lu\n"
141                        "interleave_hit %lu\n"
142                        "local_node %lu\n"
143                        "other_node %lu\n",
144                        node_page_state(dev->id, NUMA_HIT),
145                        node_page_state(dev->id, NUMA_MISS),
146                        node_page_state(dev->id, NUMA_FOREIGN),
147                        node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
148                        node_page_state(dev->id, NUMA_LOCAL),
149                        node_page_state(dev->id, NUMA_OTHER));
150 }
151 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
152
153 static ssize_t node_read_distance(struct sys_device * dev,
154                         struct sysdev_attribute *attr, char * buf)
155 {
156         int nid = dev->id;
157         int len = 0;
158         int i;
159
160         /* buf currently PAGE_SIZE, need ~4 chars per node */
161         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
162
163         for_each_online_node(i)
164                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
165
166         len += sprintf(buf + len, "\n");
167         return len;
168 }
169 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
170
171
172 /*
173  * register_node - Setup a sysfs device for a node.
174  * @num - Node number to use when creating the device.
175  *
176  * Initialize and register the node device.
177  */
178 int register_node(struct node *node, int num, struct node *parent)
179 {
180         int error;
181
182         node->sysdev.id = num;
183         node->sysdev.cls = &node_class;
184         error = sysdev_register(&node->sysdev);
185
186         if (!error){
187                 sysdev_create_file(&node->sysdev, &attr_cpumap);
188                 sysdev_create_file(&node->sysdev, &attr_cpulist);
189                 sysdev_create_file(&node->sysdev, &attr_meminfo);
190                 sysdev_create_file(&node->sysdev, &attr_numastat);
191                 sysdev_create_file(&node->sysdev, &attr_distance);
192         }
193         return error;
194 }
195
196 /**
197  * unregister_node - unregister a node device
198  * @node: node going away
199  *
200  * Unregisters a node device @node.  All the devices on the node must be
201  * unregistered before calling this function.
202  */
203 void unregister_node(struct node *node)
204 {
205         sysdev_remove_file(&node->sysdev, &attr_cpumap);
206         sysdev_remove_file(&node->sysdev, &attr_cpulist);
207         sysdev_remove_file(&node->sysdev, &attr_meminfo);
208         sysdev_remove_file(&node->sysdev, &attr_numastat);
209         sysdev_remove_file(&node->sysdev, &attr_distance);
210
211         sysdev_unregister(&node->sysdev);
212 }
213
214 struct node node_devices[MAX_NUMNODES];
215
216 /*
217  * register cpu under node
218  */
219 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
220 {
221         if (node_online(nid)) {
222                 struct sys_device *obj = get_cpu_sysdev(cpu);
223                 if (!obj)
224                         return 0;
225                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
226                                          &obj->kobj,
227                                          kobject_name(&obj->kobj));
228          }
229
230         return 0;
231 }
232
233 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
234 {
235         if (node_online(nid)) {
236                 struct sys_device *obj = get_cpu_sysdev(cpu);
237                 if (obj)
238                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
239                                          kobject_name(&obj->kobj));
240         }
241         return 0;
242 }
243
244 int register_one_node(int nid)
245 {
246         int error = 0;
247         int cpu;
248
249         if (node_online(nid)) {
250                 int p_node = parent_node(nid);
251                 struct node *parent = NULL;
252
253                 if (p_node != nid)
254                         parent = &node_devices[p_node];
255
256                 error = register_node(&node_devices[nid], nid, parent);
257
258                 /* link cpu under this node */
259                 for_each_present_cpu(cpu) {
260                         if (cpu_to_node(cpu) == nid)
261                                 register_cpu_under_node(cpu, nid);
262                 }
263         }
264
265         return error;
266
267 }
268
269 void unregister_one_node(int nid)
270 {
271         unregister_node(&node_devices[nid]);
272 }
273
274 /*
275  * node states attributes
276  */
277
278 static ssize_t print_nodes_state(enum node_states state, char *buf)
279 {
280         int n;
281
282         n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
283         if (n > 0 && PAGE_SIZE > n + 1) {
284                 *(buf + n++) = '\n';
285                 *(buf + n++) = '\0';
286         }
287         return n;
288 }
289
290 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
291 {
292         return print_nodes_state(N_POSSIBLE, buf);
293 }
294
295 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
296 {
297         return print_nodes_state(N_ONLINE, buf);
298 }
299
300 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
301                                                 char *buf)
302 {
303         return print_nodes_state(N_NORMAL_MEMORY, buf);
304 }
305
306 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
307 {
308         return print_nodes_state(N_CPU, buf);
309 }
310
311 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
312 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
313 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
314                                                                         NULL);
315 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
316
317 #ifdef CONFIG_HIGHMEM
318 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
319                                                  char *buf)
320 {
321         return print_nodes_state(N_HIGH_MEMORY, buf);
322 }
323
324 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
325                                                                          NULL);
326 #endif
327
328 struct sysdev_class_attribute *node_state_attr[] = {
329         &attr_possible,
330         &attr_online,
331         &attr_has_normal_memory,
332 #ifdef CONFIG_HIGHMEM
333         &attr_has_high_memory,
334 #endif
335         &attr_has_cpu,
336 };
337
338 static int node_states_init(void)
339 {
340         int i;
341         int err = 0;
342
343         for (i = 0;  i < NR_NODE_STATES; i++) {
344                 int ret;
345                 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
346                 if (!err)
347                         err = ret;
348         }
349         return err;
350 }
351
352 static int __init register_node_type(void)
353 {
354         int ret;
355
356         ret = sysdev_class_register(&node_class);
357         if (!ret)
358                 ret = node_states_init();
359
360         /*
361          * Note:  we're not going to unregister the node class if we fail
362          * to register the node state class attribute files.
363          */
364         return ret;
365 }
366 postcore_initcall(register_node_type);