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Now it works.
[cbs-scheduler.git] / drivers / base / node.c
blob40b809742a1c3ecf3b42a0e55b8130059d7d6e8e
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/memory.h>
10 #include <linux/node.h>
11 #include <linux/hugetlb.h>
12 #include <linux/cpumask.h>
13 #include <linux/topology.h>
14 #include <linux/nodemask.h>
15 #include <linux/cpu.h>
16 #include <linux/device.h>
17 #include <linux/swap.h>
18
19 static struct sysdev_class node_class = {
20 .name = "node",
21 };
22
23
24 static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
25 {
26 struct node *node_dev = to_node(dev);
27 const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id);
28 int len;
29
30 /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
31 BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
32
33 len = type?
34 cpulist_scnprintf(buf, PAGE_SIZE-2, mask) :
35 cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
36 buf[len++] = '\n';
37 buf[len] = '\0';
38 return len;
39 }
40
41 static inline ssize_t node_read_cpumask(struct sys_device *dev,
42 struct sysdev_attribute *attr, char *buf)
43 {
44 return node_read_cpumap(dev, 0, buf);
45 }
46 static inline ssize_t node_read_cpulist(struct sys_device *dev,
47 struct sysdev_attribute *attr, char *buf)
48 {
49 return node_read_cpumap(dev, 1, buf);
50 }
51
52 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
53 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
54
55 #define K(x) ((x) << (PAGE_SHIFT - 10))
56 static ssize_t node_read_meminfo(struct sys_device * dev,
57 struct sysdev_attribute *attr, char * buf)
58 {
59 int n;
60 int nid = dev->id;
61 struct sysinfo i;
62
63 si_meminfo_node(&i, nid);
64
65 n = sprintf(buf, "\n"
66 "Node %d MemTotal: %8lu kB\n"
67 "Node %d MemFree: %8lu kB\n"
68 "Node %d MemUsed: %8lu kB\n"
69 "Node %d Active: %8lu kB\n"
70 "Node %d Inactive: %8lu kB\n"
71 "Node %d Active(anon): %8lu kB\n"
72 "Node %d Inactive(anon): %8lu kB\n"
73 "Node %d Active(file): %8lu kB\n"
74 "Node %d Inactive(file): %8lu kB\n"
75 #ifdef CONFIG_UNEVICTABLE_LRU
76 "Node %d Unevictable: %8lu kB\n"
77 "Node %d Mlocked: %8lu kB\n"
78 #endif
79 #ifdef CONFIG_HIGHMEM
80 "Node %d HighTotal: %8lu kB\n"
81 "Node %d HighFree: %8lu kB\n"
82 "Node %d LowTotal: %8lu kB\n"
83 "Node %d LowFree: %8lu kB\n"
84 #endif
85 "Node %d Dirty: %8lu kB\n"
86 "Node %d Writeback: %8lu kB\n"
87 "Node %d FilePages: %8lu kB\n"
88 "Node %d Mapped: %8lu kB\n"
89 "Node %d AnonPages: %8lu kB\n"
90 "Node %d PageTables: %8lu kB\n"
91 "Node %d NFS_Unstable: %8lu kB\n"
92 "Node %d Bounce: %8lu kB\n"
93 "Node %d WritebackTmp: %8lu kB\n"
94 "Node %d Slab: %8lu kB\n"
95 "Node %d SReclaimable: %8lu kB\n"
96 "Node %d SUnreclaim: %8lu kB\n",
97 nid, K(i.totalram),
98 nid, K(i.freeram),
99 nid, K(i.totalram - i.freeram),
100 nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
101 node_page_state(nid, NR_ACTIVE_FILE)),
102 nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
103 node_page_state(nid, NR_INACTIVE_FILE)),
104 nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
105 nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
106 nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
107 nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
108 #ifdef CONFIG_UNEVICTABLE_LRU
109 nid, K(node_page_state(nid, NR_UNEVICTABLE)),
110 nid, K(node_page_state(nid, NR_MLOCK)),
111 #endif
112 #ifdef CONFIG_HIGHMEM
113 nid, K(i.totalhigh),
114 nid, K(i.freehigh),
115 nid, K(i.totalram - i.totalhigh),
116 nid, K(i.freeram - i.freehigh),
117 #endif
118 nid, K(node_page_state(nid, NR_FILE_DIRTY)),
119 nid, K(node_page_state(nid, NR_WRITEBACK)),
120 nid, K(node_page_state(nid, NR_FILE_PAGES)),
121 nid, K(node_page_state(nid, NR_FILE_MAPPED)),
122 nid, K(node_page_state(nid, NR_ANON_PAGES)),
123 nid, K(node_page_state(nid, NR_PAGETABLE)),
124 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
125 nid, K(node_page_state(nid, NR_BOUNCE)),
126 nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
127 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
128 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
129 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
130 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
131 n += hugetlb_report_node_meminfo(nid, buf + n);
132 return n;
133 }
134
135 #undef K
136 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
137
138 static ssize_t node_read_numastat(struct sys_device * dev,
139 struct sysdev_attribute *attr, char * buf)
140 {
141 return sprintf(buf,
142 "numa_hit %lu\n"
143 "numa_miss %lu\n"
144 "numa_foreign %lu\n"
145 "interleave_hit %lu\n"
146 "local_node %lu\n"
147 "other_node %lu\n",
148 node_page_state(dev->id, NUMA_HIT),
149 node_page_state(dev->id, NUMA_MISS),
150 node_page_state(dev->id, NUMA_FOREIGN),
151 node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
152 node_page_state(dev->id, NUMA_LOCAL),
153 node_page_state(dev->id, NUMA_OTHER));
154 }
155 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
156
157 static ssize_t node_read_distance(struct sys_device * dev,
158 struct sysdev_attribute *attr, char * buf)
159 {
160 int nid = dev->id;
161 int len = 0;
162 int i;
163
164 /* buf currently PAGE_SIZE, need ~4 chars per node */
165 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
166
167 for_each_online_node(i)
168 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
169
170 len += sprintf(buf + len, "\n");
171 return len;
172 }
173 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
174
175
176 /*
177 * register_node - Setup a sysfs device for a node.
178 * @num - Node number to use when creating the device.
179 *
180 * Initialize and register the node device.
181 */
182 int register_node(struct node *node, int num, struct node *parent)
183 {
184 int error;
185
186 node->sysdev.id = num;
187 node->sysdev.cls = &node_class;
188 error = sysdev_register(&node->sysdev);
189
190 if (!error){
191 sysdev_create_file(&node->sysdev, &attr_cpumap);
192 sysdev_create_file(&node->sysdev, &attr_cpulist);
193 sysdev_create_file(&node->sysdev, &attr_meminfo);
194 sysdev_create_file(&node->sysdev, &attr_numastat);
195 sysdev_create_file(&node->sysdev, &attr_distance);
196
197 scan_unevictable_register_node(node);
198 }
199 return error;
200 }
201
202 /**
203 * unregister_node - unregister a node device
204 * @node: node going away
205 *
206 * Unregisters a node device @node. All the devices on the node must be
207 * unregistered before calling this function.
208 */
209 void unregister_node(struct node *node)
210 {
211 sysdev_remove_file(&node->sysdev, &attr_cpumap);
212 sysdev_remove_file(&node->sysdev, &attr_cpulist);
213 sysdev_remove_file(&node->sysdev, &attr_meminfo);
214 sysdev_remove_file(&node->sysdev, &attr_numastat);
215 sysdev_remove_file(&node->sysdev, &attr_distance);
216
217 scan_unevictable_unregister_node(node);
218
219 sysdev_unregister(&node->sysdev);
220 }
221
222 struct node node_devices[MAX_NUMNODES];
223
224 /*
225 * register cpu under node
226 */
227 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
228 {
229 if (node_online(nid)) {
230 struct sys_device *obj = get_cpu_sysdev(cpu);
231 if (!obj)
232 return 0;
233 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
234 &obj->kobj,
235 kobject_name(&obj->kobj));
236 }
237
238 return 0;
239 }
240
241 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
242 {
243 if (node_online(nid)) {
244 struct sys_device *obj = get_cpu_sysdev(cpu);
245 if (obj)
246 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
247 kobject_name(&obj->kobj));
248 }
249 return 0;
250 }
251
252 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
253 #define page_initialized(page) (page->lru.next)
254
255 static int get_nid_for_pfn(unsigned long pfn)
256 {
257 struct page *page;
258
259 if (!pfn_valid_within(pfn))
260 return -1;
261 page = pfn_to_page(pfn);
262 if (!page_initialized(page))
263 return -1;
264 return pfn_to_nid(pfn);
265 }
266
267 /* register memory section under specified node if it spans that node */
268 int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
269 {
270 unsigned long pfn, sect_start_pfn, sect_end_pfn;
271
272 if (!mem_blk)
273 return -EFAULT;
274 if (!node_online(nid))
275 return 0;
276 sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
277 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
278 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
279 int page_nid;
280
281 page_nid = get_nid_for_pfn(pfn);
282 if (page_nid < 0)
283 continue;
284 if (page_nid != nid)
285 continue;
286 return sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
287 &mem_blk->sysdev.kobj,
288 kobject_name(&mem_blk->sysdev.kobj));
289 }
290 /* mem section does not span the specified node */
291 return 0;
292 }
293
294 /* unregister memory section under all nodes that it spans */
295 int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
296 {
297 nodemask_t unlinked_nodes;
298 unsigned long pfn, sect_start_pfn, sect_end_pfn;
299
300 if (!mem_blk)
301 return -EFAULT;
302 nodes_clear(unlinked_nodes);
303 sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
304 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
305 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
306 int nid;
307
308 nid = get_nid_for_pfn(pfn);
309 if (nid < 0)
310 continue;
311 if (!node_online(nid))
312 continue;
313 if (node_test_and_set(nid, unlinked_nodes))
314 continue;
315 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
316 kobject_name(&mem_blk->sysdev.kobj));
317 }
318 return 0;
319 }
320
321 static int link_mem_sections(int nid)
322 {
323 unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
324 unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
325 unsigned long pfn;
326 int err = 0;
327
328 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
329 unsigned long section_nr = pfn_to_section_nr(pfn);
330 struct mem_section *mem_sect;
331 struct memory_block *mem_blk;
332 int ret;
333
334 if (!present_section_nr(section_nr))
335 continue;
336 mem_sect = __nr_to_section(section_nr);
337 mem_blk = find_memory_block(mem_sect);
338 ret = register_mem_sect_under_node(mem_blk, nid);
339 if (!err)
340 err = ret;
341
342 /* discard ref obtained in find_memory_block() */
343 kobject_put(&mem_blk->sysdev.kobj);
344 }
345 return err;
346 }
347 #else
348 static int link_mem_sections(int nid) { return 0; }
349 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
350
351 int register_one_node(int nid)
352 {
353 int error = 0;
354 int cpu;
355
356 if (node_online(nid)) {
357 int p_node = parent_node(nid);
358 struct node *parent = NULL;
359
360 if (p_node != nid)
361 parent = &node_devices[p_node];
362
363 error = register_node(&node_devices[nid], nid, parent);
364
365 /* link cpu under this node */
366 for_each_present_cpu(cpu) {
367 if (cpu_to_node(cpu) == nid)
368 register_cpu_under_node(cpu, nid);
369 }
370
371 /* link memory sections under this node */
372 error = link_mem_sections(nid);
373 }
374
375 return error;
376
377 }
378
379 void unregister_one_node(int nid)
380 {
381 unregister_node(&node_devices[nid]);
382 }
383
384 /*
385 * node states attributes
386 */
387
388 static ssize_t print_nodes_state(enum node_states state, char *buf)
389 {
390 int n;
391
392 n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
393 if (n > 0 && PAGE_SIZE > n + 1) {
394 *(buf + n++) = '\n';
395 *(buf + n++) = '\0';
396 }
397 return n;
398 }
399
400 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
401 {
402 return print_nodes_state(N_POSSIBLE, buf);
403 }
404
405 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
406 {
407 return print_nodes_state(N_ONLINE, buf);
408 }
409
410 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
411 char *buf)
412 {
413 return print_nodes_state(N_NORMAL_MEMORY, buf);
414 }
415
416 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
417 {
418 return print_nodes_state(N_CPU, buf);
419 }
420
421 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
422 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
423 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
424 NULL);
425 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
426
427 #ifdef CONFIG_HIGHMEM
428 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
429 char *buf)
430 {
431 return print_nodes_state(N_HIGH_MEMORY, buf);
432 }
433
434 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
435 NULL);
436 #endif
437
438 struct sysdev_class_attribute *node_state_attr[] = {
439 &attr_possible,
440 &attr_online,
441 &attr_has_normal_memory,
442 #ifdef CONFIG_HIGHMEM
443 &attr_has_high_memory,
444 #endif
445 &attr_has_cpu,
446 };
447
448 static int node_states_init(void)
449 {
450 int i;
451 int err = 0;
452
453 for (i = 0; i < NR_NODE_STATES; i++) {
454 int ret;
455 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
456 if (!err)
457 err = ret;
458 }
459 return err;
460 }
461
462 static int __init register_node_type(void)
463 {
464 int ret;
465
466 ret = sysdev_class_register(&node_class);
467 if (!ret)
468 ret = node_states_init();
469
470 /*
471 * Note: we're not going to unregister the node class if we fail
472 * to register the node state class attribute files.
473 */
474 return ret;
475 }
476 postcore_initcall(register_node_type);
A cbs scheduler for rt-kernel