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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
10fbcf4c | 3 | * Basic Node interface support |
1da177e4 LT |
4 | */ |
5 | ||
1da177e4 LT |
6 | #include <linux/module.h> |
7 | #include <linux/init.h> | |
8 | #include <linux/mm.h> | |
c04fc586 | 9 | #include <linux/memory.h> |
fa25c503 | 10 | #include <linux/vmstat.h> |
6e259e7d | 11 | #include <linux/notifier.h> |
1da177e4 LT |
12 | #include <linux/node.h> |
13 | #include <linux/hugetlb.h> | |
ed4a6d7f | 14 | #include <linux/compaction.h> |
1da177e4 LT |
15 | #include <linux/cpumask.h> |
16 | #include <linux/topology.h> | |
17 | #include <linux/nodemask.h> | |
76b67ed9 | 18 | #include <linux/cpu.h> |
bde631a5 | 19 | #include <linux/device.h> |
08d9dbe7 | 20 | #include <linux/pm_runtime.h> |
af936a16 | 21 | #include <linux/swap.h> |
18e5b539 | 22 | #include <linux/slab.h> |
1da177e4 | 23 | |
10fbcf4c | 24 | static struct bus_type node_subsys = { |
af5ca3f4 | 25 | .name = "node", |
10fbcf4c | 26 | .dev_name = "node", |
1da177e4 LT |
27 | }; |
28 | ||
29 | ||
5aaba363 | 30 | static ssize_t node_read_cpumap(struct device *dev, bool list, char *buf) |
1da177e4 | 31 | { |
064f0e93 ZL |
32 | ssize_t n; |
33 | cpumask_var_t mask; | |
1da177e4 | 34 | struct node *node_dev = to_node(dev); |
1da177e4 | 35 | |
39106dcf MT |
36 | /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */ |
37 | BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1)); | |
1da177e4 | 38 | |
064f0e93 ZL |
39 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
40 | return 0; | |
41 | ||
42 | cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask); | |
43 | n = cpumap_print_to_pagebuf(list, buf, mask); | |
44 | free_cpumask_var(mask); | |
45 | ||
46 | return n; | |
1da177e4 LT |
47 | } |
48 | ||
10fbcf4c KS |
49 | static inline ssize_t node_read_cpumask(struct device *dev, |
50 | struct device_attribute *attr, char *buf) | |
39106dcf | 51 | { |
5aaba363 | 52 | return node_read_cpumap(dev, false, buf); |
39106dcf | 53 | } |
10fbcf4c KS |
54 | static inline ssize_t node_read_cpulist(struct device *dev, |
55 | struct device_attribute *attr, char *buf) | |
39106dcf | 56 | { |
5aaba363 | 57 | return node_read_cpumap(dev, true, buf); |
39106dcf MT |
58 | } |
59 | ||
10fbcf4c KS |
60 | static DEVICE_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); |
61 | static DEVICE_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL); | |
1da177e4 | 62 | |
08d9dbe7 KB |
63 | /** |
64 | * struct node_access_nodes - Access class device to hold user visible | |
65 | * relationships to other nodes. | |
66 | * @dev: Device for this memory access class | |
67 | * @list_node: List element in the node's access list | |
68 | * @access: The access class rank | |
58cb346c | 69 | * @hmem_attrs: Heterogeneous memory performance attributes |
08d9dbe7 KB |
70 | */ |
71 | struct node_access_nodes { | |
72 | struct device dev; | |
73 | struct list_head list_node; | |
74 | unsigned access; | |
e1cf33aa KB |
75 | #ifdef CONFIG_HMEM_REPORTING |
76 | struct node_hmem_attrs hmem_attrs; | |
77 | #endif | |
08d9dbe7 KB |
78 | }; |
79 | #define to_access_nodes(dev) container_of(dev, struct node_access_nodes, dev) | |
80 | ||
81 | static struct attribute *node_init_access_node_attrs[] = { | |
82 | NULL, | |
83 | }; | |
84 | ||
85 | static struct attribute *node_targ_access_node_attrs[] = { | |
86 | NULL, | |
87 | }; | |
88 | ||
89 | static const struct attribute_group initiators = { | |
90 | .name = "initiators", | |
91 | .attrs = node_init_access_node_attrs, | |
92 | }; | |
93 | ||
94 | static const struct attribute_group targets = { | |
95 | .name = "targets", | |
96 | .attrs = node_targ_access_node_attrs, | |
97 | }; | |
98 | ||
99 | static const struct attribute_group *node_access_node_groups[] = { | |
100 | &initiators, | |
101 | &targets, | |
102 | NULL, | |
103 | }; | |
104 | ||
105 | static void node_remove_accesses(struct node *node) | |
106 | { | |
107 | struct node_access_nodes *c, *cnext; | |
108 | ||
109 | list_for_each_entry_safe(c, cnext, &node->access_list, list_node) { | |
110 | list_del(&c->list_node); | |
111 | device_unregister(&c->dev); | |
112 | } | |
113 | } | |
114 | ||
115 | static void node_access_release(struct device *dev) | |
116 | { | |
117 | kfree(to_access_nodes(dev)); | |
118 | } | |
119 | ||
120 | static struct node_access_nodes *node_init_node_access(struct node *node, | |
121 | unsigned access) | |
122 | { | |
123 | struct node_access_nodes *access_node; | |
124 | struct device *dev; | |
125 | ||
126 | list_for_each_entry(access_node, &node->access_list, list_node) | |
127 | if (access_node->access == access) | |
128 | return access_node; | |
129 | ||
130 | access_node = kzalloc(sizeof(*access_node), GFP_KERNEL); | |
131 | if (!access_node) | |
132 | return NULL; | |
133 | ||
134 | access_node->access = access; | |
135 | dev = &access_node->dev; | |
136 | dev->parent = &node->dev; | |
137 | dev->release = node_access_release; | |
138 | dev->groups = node_access_node_groups; | |
139 | if (dev_set_name(dev, "access%u", access)) | |
140 | goto free; | |
141 | ||
142 | if (device_register(dev)) | |
143 | goto free_name; | |
144 | ||
145 | pm_runtime_no_callbacks(dev); | |
146 | list_add_tail(&access_node->list_node, &node->access_list); | |
147 | return access_node; | |
148 | free_name: | |
149 | kfree_const(dev->kobj.name); | |
150 | free: | |
151 | kfree(access_node); | |
152 | return NULL; | |
153 | } | |
154 | ||
e1cf33aa KB |
155 | #ifdef CONFIG_HMEM_REPORTING |
156 | #define ACCESS_ATTR(name) \ | |
157 | static ssize_t name##_show(struct device *dev, \ | |
158 | struct device_attribute *attr, \ | |
159 | char *buf) \ | |
160 | { \ | |
161 | return sprintf(buf, "%u\n", to_access_nodes(dev)->hmem_attrs.name); \ | |
162 | } \ | |
163 | static DEVICE_ATTR_RO(name); | |
164 | ||
165 | ACCESS_ATTR(read_bandwidth) | |
166 | ACCESS_ATTR(read_latency) | |
167 | ACCESS_ATTR(write_bandwidth) | |
168 | ACCESS_ATTR(write_latency) | |
169 | ||
170 | static struct attribute *access_attrs[] = { | |
171 | &dev_attr_read_bandwidth.attr, | |
172 | &dev_attr_read_latency.attr, | |
173 | &dev_attr_write_bandwidth.attr, | |
174 | &dev_attr_write_latency.attr, | |
175 | NULL, | |
176 | }; | |
177 | ||
178 | /** | |
179 | * node_set_perf_attrs - Set the performance values for given access class | |
180 | * @nid: Node identifier to be set | |
181 | * @hmem_attrs: Heterogeneous memory performance attributes | |
182 | * @access: The access class the for the given attributes | |
183 | */ | |
184 | void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs, | |
185 | unsigned access) | |
186 | { | |
187 | struct node_access_nodes *c; | |
188 | struct node *node; | |
189 | int i; | |
190 | ||
191 | if (WARN_ON_ONCE(!node_online(nid))) | |
192 | return; | |
193 | ||
194 | node = node_devices[nid]; | |
195 | c = node_init_node_access(node, access); | |
196 | if (!c) | |
197 | return; | |
198 | ||
199 | c->hmem_attrs = *hmem_attrs; | |
200 | for (i = 0; access_attrs[i] != NULL; i++) { | |
201 | if (sysfs_add_file_to_group(&c->dev.kobj, access_attrs[i], | |
202 | "initiators")) { | |
203 | pr_info("failed to add performance attribute to node %d\n", | |
204 | nid); | |
205 | break; | |
206 | } | |
207 | } | |
208 | } | |
acc02a10 KB |
209 | |
210 | /** | |
211 | * struct node_cache_info - Internal tracking for memory node caches | |
212 | * @dev: Device represeting the cache level | |
213 | * @node: List element for tracking in the node | |
214 | * @cache_attrs:Attributes for this cache level | |
215 | */ | |
216 | struct node_cache_info { | |
217 | struct device dev; | |
218 | struct list_head node; | |
219 | struct node_cache_attrs cache_attrs; | |
220 | }; | |
221 | #define to_cache_info(device) container_of(device, struct node_cache_info, dev) | |
222 | ||
223 | #define CACHE_ATTR(name, fmt) \ | |
224 | static ssize_t name##_show(struct device *dev, \ | |
225 | struct device_attribute *attr, \ | |
226 | char *buf) \ | |
227 | { \ | |
228 | return sprintf(buf, fmt "\n", to_cache_info(dev)->cache_attrs.name);\ | |
229 | } \ | |
230 | DEVICE_ATTR_RO(name); | |
231 | ||
232 | CACHE_ATTR(size, "%llu") | |
233 | CACHE_ATTR(line_size, "%u") | |
234 | CACHE_ATTR(indexing, "%u") | |
235 | CACHE_ATTR(write_policy, "%u") | |
236 | ||
237 | static struct attribute *cache_attrs[] = { | |
238 | &dev_attr_indexing.attr, | |
239 | &dev_attr_size.attr, | |
240 | &dev_attr_line_size.attr, | |
241 | &dev_attr_write_policy.attr, | |
242 | NULL, | |
243 | }; | |
244 | ATTRIBUTE_GROUPS(cache); | |
245 | ||
246 | static void node_cache_release(struct device *dev) | |
247 | { | |
248 | kfree(dev); | |
249 | } | |
250 | ||
251 | static void node_cacheinfo_release(struct device *dev) | |
252 | { | |
253 | struct node_cache_info *info = to_cache_info(dev); | |
254 | kfree(info); | |
255 | } | |
256 | ||
257 | static void node_init_cache_dev(struct node *node) | |
258 | { | |
259 | struct device *dev; | |
260 | ||
261 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
262 | if (!dev) | |
263 | return; | |
264 | ||
265 | dev->parent = &node->dev; | |
266 | dev->release = node_cache_release; | |
267 | if (dev_set_name(dev, "memory_side_cache")) | |
268 | goto free_dev; | |
269 | ||
270 | if (device_register(dev)) | |
271 | goto free_name; | |
272 | ||
273 | pm_runtime_no_callbacks(dev); | |
274 | node->cache_dev = dev; | |
275 | return; | |
276 | free_name: | |
277 | kfree_const(dev->kobj.name); | |
278 | free_dev: | |
279 | kfree(dev); | |
280 | } | |
281 | ||
282 | /** | |
283 | * node_add_cache() - add cache attribute to a memory node | |
284 | * @nid: Node identifier that has new cache attributes | |
285 | * @cache_attrs: Attributes for the cache being added | |
286 | */ | |
287 | void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs) | |
288 | { | |
289 | struct node_cache_info *info; | |
290 | struct device *dev; | |
291 | struct node *node; | |
292 | ||
293 | if (!node_online(nid) || !node_devices[nid]) | |
294 | return; | |
295 | ||
296 | node = node_devices[nid]; | |
297 | list_for_each_entry(info, &node->cache_attrs, node) { | |
298 | if (info->cache_attrs.level == cache_attrs->level) { | |
299 | dev_warn(&node->dev, | |
300 | "attempt to add duplicate cache level:%d\n", | |
301 | cache_attrs->level); | |
302 | return; | |
303 | } | |
304 | } | |
305 | ||
306 | if (!node->cache_dev) | |
307 | node_init_cache_dev(node); | |
308 | if (!node->cache_dev) | |
309 | return; | |
310 | ||
311 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
312 | if (!info) | |
313 | return; | |
314 | ||
315 | dev = &info->dev; | |
316 | dev->parent = node->cache_dev; | |
317 | dev->release = node_cacheinfo_release; | |
318 | dev->groups = cache_groups; | |
319 | if (dev_set_name(dev, "index%d", cache_attrs->level)) | |
320 | goto free_cache; | |
321 | ||
322 | info->cache_attrs = *cache_attrs; | |
323 | if (device_register(dev)) { | |
324 | dev_warn(&node->dev, "failed to add cache level:%d\n", | |
325 | cache_attrs->level); | |
326 | goto free_name; | |
327 | } | |
328 | pm_runtime_no_callbacks(dev); | |
329 | list_add_tail(&info->node, &node->cache_attrs); | |
330 | return; | |
331 | free_name: | |
332 | kfree_const(dev->kobj.name); | |
333 | free_cache: | |
334 | kfree(info); | |
335 | } | |
336 | ||
337 | static void node_remove_caches(struct node *node) | |
338 | { | |
339 | struct node_cache_info *info, *next; | |
340 | ||
341 | if (!node->cache_dev) | |
342 | return; | |
343 | ||
344 | list_for_each_entry_safe(info, next, &node->cache_attrs, node) { | |
345 | list_del(&info->node); | |
346 | device_unregister(&info->dev); | |
347 | } | |
348 | device_unregister(node->cache_dev); | |
349 | } | |
350 | ||
351 | static void node_init_caches(unsigned int nid) | |
352 | { | |
353 | INIT_LIST_HEAD(&node_devices[nid]->cache_attrs); | |
354 | } | |
355 | #else | |
356 | static void node_init_caches(unsigned int nid) { } | |
357 | static void node_remove_caches(struct node *node) { } | |
e1cf33aa KB |
358 | #endif |
359 | ||
1da177e4 | 360 | #define K(x) ((x) << (PAGE_SHIFT - 10)) |
10fbcf4c KS |
361 | static ssize_t node_read_meminfo(struct device *dev, |
362 | struct device_attribute *attr, char *buf) | |
1da177e4 LT |
363 | { |
364 | int n; | |
365 | int nid = dev->id; | |
599d0c95 | 366 | struct pglist_data *pgdat = NODE_DATA(nid); |
1da177e4 | 367 | struct sysinfo i; |
61f94e18 | 368 | unsigned long sreclaimable, sunreclaimable; |
1da177e4 LT |
369 | |
370 | si_meminfo_node(&i, nid); | |
61f94e18 VB |
371 | sreclaimable = node_page_state(pgdat, NR_SLAB_RECLAIMABLE); |
372 | sunreclaimable = node_page_state(pgdat, NR_SLAB_UNRECLAIMABLE); | |
7ee92255 | 373 | n = sprintf(buf, |
4f98a2fe RR |
374 | "Node %d MemTotal: %8lu kB\n" |
375 | "Node %d MemFree: %8lu kB\n" | |
376 | "Node %d MemUsed: %8lu kB\n" | |
377 | "Node %d Active: %8lu kB\n" | |
378 | "Node %d Inactive: %8lu kB\n" | |
379 | "Node %d Active(anon): %8lu kB\n" | |
380 | "Node %d Inactive(anon): %8lu kB\n" | |
381 | "Node %d Active(file): %8lu kB\n" | |
382 | "Node %d Inactive(file): %8lu kB\n" | |
5344b7e6 | 383 | "Node %d Unevictable: %8lu kB\n" |
7ee92255 KM |
384 | "Node %d Mlocked: %8lu kB\n", |
385 | nid, K(i.totalram), | |
386 | nid, K(i.freeram), | |
387 | nid, K(i.totalram - i.freeram), | |
599d0c95 MG |
388 | nid, K(node_page_state(pgdat, NR_ACTIVE_ANON) + |
389 | node_page_state(pgdat, NR_ACTIVE_FILE)), | |
390 | nid, K(node_page_state(pgdat, NR_INACTIVE_ANON) + | |
391 | node_page_state(pgdat, NR_INACTIVE_FILE)), | |
392 | nid, K(node_page_state(pgdat, NR_ACTIVE_ANON)), | |
393 | nid, K(node_page_state(pgdat, NR_INACTIVE_ANON)), | |
394 | nid, K(node_page_state(pgdat, NR_ACTIVE_FILE)), | |
395 | nid, K(node_page_state(pgdat, NR_INACTIVE_FILE)), | |
396 | nid, K(node_page_state(pgdat, NR_UNEVICTABLE)), | |
75ef7184 | 397 | nid, K(sum_zone_node_page_state(nid, NR_MLOCK))); |
7ee92255 | 398 | |
182e8e23 | 399 | #ifdef CONFIG_HIGHMEM |
7ee92255 | 400 | n += sprintf(buf + n, |
4f98a2fe RR |
401 | "Node %d HighTotal: %8lu kB\n" |
402 | "Node %d HighFree: %8lu kB\n" | |
403 | "Node %d LowTotal: %8lu kB\n" | |
7ee92255 KM |
404 | "Node %d LowFree: %8lu kB\n", |
405 | nid, K(i.totalhigh), | |
406 | nid, K(i.freehigh), | |
407 | nid, K(i.totalram - i.totalhigh), | |
408 | nid, K(i.freeram - i.freehigh)); | |
182e8e23 | 409 | #endif |
7ee92255 | 410 | n += sprintf(buf + n, |
4f98a2fe RR |
411 | "Node %d Dirty: %8lu kB\n" |
412 | "Node %d Writeback: %8lu kB\n" | |
413 | "Node %d FilePages: %8lu kB\n" | |
414 | "Node %d Mapped: %8lu kB\n" | |
415 | "Node %d AnonPages: %8lu kB\n" | |
4b02108a | 416 | "Node %d Shmem: %8lu kB\n" |
c6a7f572 | 417 | "Node %d KernelStack: %8lu kB\n" |
4f98a2fe RR |
418 | "Node %d PageTables: %8lu kB\n" |
419 | "Node %d NFS_Unstable: %8lu kB\n" | |
420 | "Node %d Bounce: %8lu kB\n" | |
421 | "Node %d WritebackTmp: %8lu kB\n" | |
61f94e18 | 422 | "Node %d KReclaimable: %8lu kB\n" |
4f98a2fe RR |
423 | "Node %d Slab: %8lu kB\n" |
424 | "Node %d SReclaimable: %8lu kB\n" | |
05b258e9 DR |
425 | "Node %d SUnreclaim: %8lu kB\n" |
426 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
427 | "Node %d AnonHugePages: %8lu kB\n" | |
65c45377 KS |
428 | "Node %d ShmemHugePages: %8lu kB\n" |
429 | "Node %d ShmemPmdMapped: %8lu kB\n" | |
60fbf0ab SL |
430 | "Node %d FileHugePages: %8lu kB\n" |
431 | "Node %d FilePmdMapped: %8lu kB\n" | |
05b258e9 DR |
432 | #endif |
433 | , | |
11fb9989 MG |
434 | nid, K(node_page_state(pgdat, NR_FILE_DIRTY)), |
435 | nid, K(node_page_state(pgdat, NR_WRITEBACK)), | |
436 | nid, K(node_page_state(pgdat, NR_FILE_PAGES)), | |
50658e2e | 437 | nid, K(node_page_state(pgdat, NR_FILE_MAPPED)), |
4b9d0fab | 438 | nid, K(node_page_state(pgdat, NR_ANON_MAPPED)), |
cc7452b6 | 439 | nid, K(i.sharedram), |
d30dd8be | 440 | nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK_KB), |
75ef7184 | 441 | nid, K(sum_zone_node_page_state(nid, NR_PAGETABLE)), |
11fb9989 | 442 | nid, K(node_page_state(pgdat, NR_UNSTABLE_NFS)), |
75ef7184 | 443 | nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)), |
11fb9989 | 444 | nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)), |
61f94e18 VB |
445 | nid, K(sreclaimable + |
446 | node_page_state(pgdat, NR_KERNEL_MISC_RECLAIMABLE)), | |
447 | nid, K(sreclaimable + sunreclaimable), | |
448 | nid, K(sreclaimable), | |
449 | nid, K(sunreclaimable) | |
05b258e9 | 450 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
61f94e18 | 451 | , |
11fb9989 | 452 | nid, K(node_page_state(pgdat, NR_ANON_THPS) * |
65c45377 | 453 | HPAGE_PMD_NR), |
11fb9989 | 454 | nid, K(node_page_state(pgdat, NR_SHMEM_THPS) * |
65c45377 | 455 | HPAGE_PMD_NR), |
11fb9989 | 456 | nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) * |
60fbf0ab SL |
457 | HPAGE_PMD_NR), |
458 | nid, K(node_page_state(pgdat, NR_FILE_THPS) * | |
459 | HPAGE_PMD_NR), | |
460 | nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED) * | |
61f94e18 | 461 | HPAGE_PMD_NR) |
05b258e9 | 462 | #endif |
61f94e18 | 463 | ); |
1da177e4 LT |
464 | n += hugetlb_report_node_meminfo(nid, buf + n); |
465 | return n; | |
466 | } | |
467 | ||
468 | #undef K | |
10fbcf4c | 469 | static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); |
1da177e4 | 470 | |
10fbcf4c KS |
471 | static ssize_t node_read_numastat(struct device *dev, |
472 | struct device_attribute *attr, char *buf) | |
1da177e4 | 473 | { |
1da177e4 LT |
474 | return sprintf(buf, |
475 | "numa_hit %lu\n" | |
476 | "numa_miss %lu\n" | |
477 | "numa_foreign %lu\n" | |
478 | "interleave_hit %lu\n" | |
479 | "local_node %lu\n" | |
480 | "other_node %lu\n", | |
3a321d2a KW |
481 | sum_zone_numa_state(dev->id, NUMA_HIT), |
482 | sum_zone_numa_state(dev->id, NUMA_MISS), | |
483 | sum_zone_numa_state(dev->id, NUMA_FOREIGN), | |
484 | sum_zone_numa_state(dev->id, NUMA_INTERLEAVE_HIT), | |
485 | sum_zone_numa_state(dev->id, NUMA_LOCAL), | |
486 | sum_zone_numa_state(dev->id, NUMA_OTHER)); | |
1da177e4 | 487 | } |
10fbcf4c | 488 | static DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); |
1da177e4 | 489 | |
10fbcf4c KS |
490 | static ssize_t node_read_vmstat(struct device *dev, |
491 | struct device_attribute *attr, char *buf) | |
2ac39037 MR |
492 | { |
493 | int nid = dev->id; | |
75ef7184 | 494 | struct pglist_data *pgdat = NODE_DATA(nid); |
fa25c503 KM |
495 | int i; |
496 | int n = 0; | |
497 | ||
498 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
499 | n += sprintf(buf+n, "%s %lu\n", vmstat_text[i], | |
75ef7184 MG |
500 | sum_zone_node_page_state(nid, i)); |
501 | ||
3a321d2a KW |
502 | #ifdef CONFIG_NUMA |
503 | for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++) | |
75ef7184 MG |
504 | n += sprintf(buf+n, "%s %lu\n", |
505 | vmstat_text[i + NR_VM_ZONE_STAT_ITEMS], | |
3a321d2a KW |
506 | sum_zone_numa_state(nid, i)); |
507 | #endif | |
508 | ||
509 | for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) | |
510 | n += sprintf(buf+n, "%s %lu\n", | |
511 | vmstat_text[i + NR_VM_ZONE_STAT_ITEMS + | |
512 | NR_VM_NUMA_STAT_ITEMS], | |
75ef7184 | 513 | node_page_state(pgdat, i)); |
fa25c503 KM |
514 | |
515 | return n; | |
2ac39037 | 516 | } |
10fbcf4c | 517 | static DEVICE_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL); |
2ac39037 | 518 | |
10fbcf4c | 519 | static ssize_t node_read_distance(struct device *dev, |
518d3f38 | 520 | struct device_attribute *attr, char *buf) |
1da177e4 LT |
521 | { |
522 | int nid = dev->id; | |
523 | int len = 0; | |
524 | int i; | |
525 | ||
12ee3c0a DR |
526 | /* |
527 | * buf is currently PAGE_SIZE in length and each node needs 4 chars | |
528 | * at the most (distance + space or newline). | |
529 | */ | |
530 | BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE); | |
1da177e4 LT |
531 | |
532 | for_each_online_node(i) | |
533 | len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); | |
534 | ||
535 | len += sprintf(buf + len, "\n"); | |
536 | return len; | |
537 | } | |
10fbcf4c | 538 | static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL); |
1da177e4 | 539 | |
3c9b8aaf TI |
540 | static struct attribute *node_dev_attrs[] = { |
541 | &dev_attr_cpumap.attr, | |
542 | &dev_attr_cpulist.attr, | |
543 | &dev_attr_meminfo.attr, | |
544 | &dev_attr_numastat.attr, | |
545 | &dev_attr_distance.attr, | |
546 | &dev_attr_vmstat.attr, | |
547 | NULL | |
548 | }; | |
7ca7ec40 | 549 | ATTRIBUTE_GROUPS(node_dev); |
3c9b8aaf | 550 | |
9a305230 LS |
551 | #ifdef CONFIG_HUGETLBFS |
552 | /* | |
553 | * hugetlbfs per node attributes registration interface: | |
554 | * When/if hugetlb[fs] subsystem initializes [sometime after this module], | |
4faf8d95 LS |
555 | * it will register its per node attributes for all online nodes with |
556 | * memory. It will also call register_hugetlbfs_with_node(), below, to | |
9a305230 LS |
557 | * register its attribute registration functions with this node driver. |
558 | * Once these hooks have been initialized, the node driver will call into | |
559 | * the hugetlb module to [un]register attributes for hot-plugged nodes. | |
560 | */ | |
561 | static node_registration_func_t __hugetlb_register_node; | |
562 | static node_registration_func_t __hugetlb_unregister_node; | |
563 | ||
39da08cb | 564 | static inline bool hugetlb_register_node(struct node *node) |
9a305230 | 565 | { |
4faf8d95 | 566 | if (__hugetlb_register_node && |
8cebfcd0 | 567 | node_state(node->dev.id, N_MEMORY)) { |
9a305230 | 568 | __hugetlb_register_node(node); |
39da08cb LS |
569 | return true; |
570 | } | |
571 | return false; | |
9a305230 LS |
572 | } |
573 | ||
574 | static inline void hugetlb_unregister_node(struct node *node) | |
575 | { | |
576 | if (__hugetlb_unregister_node) | |
577 | __hugetlb_unregister_node(node); | |
578 | } | |
579 | ||
580 | void register_hugetlbfs_with_node(node_registration_func_t doregister, | |
581 | node_registration_func_t unregister) | |
582 | { | |
583 | __hugetlb_register_node = doregister; | |
584 | __hugetlb_unregister_node = unregister; | |
585 | } | |
586 | #else | |
587 | static inline void hugetlb_register_node(struct node *node) {} | |
588 | ||
589 | static inline void hugetlb_unregister_node(struct node *node) {} | |
590 | #endif | |
591 | ||
8c7b5b4e YI |
592 | static void node_device_release(struct device *dev) |
593 | { | |
594 | struct node *node = to_node(dev); | |
595 | ||
596 | #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS) | |
597 | /* | |
598 | * We schedule the work only when a memory section is | |
599 | * onlined/offlined on this node. When we come here, | |
600 | * all the memory on this node has been offlined, | |
601 | * so we won't enqueue new work to this work. | |
602 | * | |
603 | * The work is using node->node_work, so we should | |
604 | * flush work before freeing the memory. | |
605 | */ | |
606 | flush_work(&node->node_work); | |
607 | #endif | |
608 | kfree(node); | |
609 | } | |
1da177e4 LT |
610 | |
611 | /* | |
405ae7d3 | 612 | * register_node - Setup a sysfs device for a node. |
1da177e4 LT |
613 | * @num - Node number to use when creating the device. |
614 | * | |
615 | * Initialize and register the node device. | |
616 | */ | |
a7be6e5a | 617 | static int register_node(struct node *node, int num) |
1da177e4 LT |
618 | { |
619 | int error; | |
620 | ||
10fbcf4c KS |
621 | node->dev.id = num; |
622 | node->dev.bus = &node_subsys; | |
8c7b5b4e | 623 | node->dev.release = node_device_release; |
7ca7ec40 | 624 | node->dev.groups = node_dev_groups; |
10fbcf4c | 625 | error = device_register(&node->dev); |
1da177e4 | 626 | |
c1cc0d51 AY |
627 | if (error) |
628 | put_device(&node->dev); | |
629 | else { | |
9a305230 | 630 | hugetlb_register_node(node); |
ed4a6d7f MG |
631 | |
632 | compaction_register_node(node); | |
1da177e4 LT |
633 | } |
634 | return error; | |
635 | } | |
636 | ||
4b45099b KT |
637 | /** |
638 | * unregister_node - unregister a node device | |
639 | * @node: node going away | |
640 | * | |
641 | * Unregisters a node device @node. All the devices on the node must be | |
642 | * unregistered before calling this function. | |
643 | */ | |
644 | void unregister_node(struct node *node) | |
645 | { | |
4faf8d95 | 646 | hugetlb_unregister_node(node); /* no-op, if memoryless node */ |
08d9dbe7 | 647 | node_remove_accesses(node); |
acc02a10 | 648 | node_remove_caches(node); |
10fbcf4c | 649 | device_unregister(&node->dev); |
4b45099b | 650 | } |
1da177e4 | 651 | |
8732794b | 652 | struct node *node_devices[MAX_NUMNODES]; |
0fc44159 | 653 | |
76b67ed9 KH |
654 | /* |
655 | * register cpu under node | |
656 | */ | |
657 | int register_cpu_under_node(unsigned int cpu, unsigned int nid) | |
658 | { | |
1830794a | 659 | int ret; |
8a25a2fd | 660 | struct device *obj; |
76b67ed9 | 661 | |
f8246f31 AC |
662 | if (!node_online(nid)) |
663 | return 0; | |
664 | ||
8a25a2fd | 665 | obj = get_cpu_device(cpu); |
f8246f31 AC |
666 | if (!obj) |
667 | return 0; | |
668 | ||
8732794b | 669 | ret = sysfs_create_link(&node_devices[nid]->dev.kobj, |
f8246f31 AC |
670 | &obj->kobj, |
671 | kobject_name(&obj->kobj)); | |
1830794a AC |
672 | if (ret) |
673 | return ret; | |
674 | ||
675 | return sysfs_create_link(&obj->kobj, | |
8732794b WC |
676 | &node_devices[nid]->dev.kobj, |
677 | kobject_name(&node_devices[nid]->dev.kobj)); | |
76b67ed9 KH |
678 | } |
679 | ||
08d9dbe7 KB |
680 | /** |
681 | * register_memory_node_under_compute_node - link memory node to its compute | |
682 | * node for a given access class. | |
58cb346c MCC |
683 | * @mem_nid: Memory node number |
684 | * @cpu_nid: Cpu node number | |
08d9dbe7 KB |
685 | * @access: Access class to register |
686 | * | |
687 | * Description: | |
688 | * For use with platforms that may have separate memory and compute nodes. | |
689 | * This function will export node relationships linking which memory | |
690 | * initiator nodes can access memory targets at a given ranked access | |
691 | * class. | |
692 | */ | |
693 | int register_memory_node_under_compute_node(unsigned int mem_nid, | |
694 | unsigned int cpu_nid, | |
695 | unsigned access) | |
696 | { | |
697 | struct node *init_node, *targ_node; | |
698 | struct node_access_nodes *initiator, *target; | |
699 | int ret; | |
700 | ||
701 | if (!node_online(cpu_nid) || !node_online(mem_nid)) | |
702 | return -ENODEV; | |
703 | ||
704 | init_node = node_devices[cpu_nid]; | |
705 | targ_node = node_devices[mem_nid]; | |
706 | initiator = node_init_node_access(init_node, access); | |
707 | target = node_init_node_access(targ_node, access); | |
708 | if (!initiator || !target) | |
709 | return -ENOMEM; | |
710 | ||
711 | ret = sysfs_add_link_to_group(&initiator->dev.kobj, "targets", | |
712 | &targ_node->dev.kobj, | |
713 | dev_name(&targ_node->dev)); | |
714 | if (ret) | |
715 | return ret; | |
716 | ||
717 | ret = sysfs_add_link_to_group(&target->dev.kobj, "initiators", | |
718 | &init_node->dev.kobj, | |
719 | dev_name(&init_node->dev)); | |
720 | if (ret) | |
721 | goto err; | |
722 | ||
723 | return 0; | |
724 | err: | |
725 | sysfs_remove_link_from_group(&initiator->dev.kobj, "targets", | |
726 | dev_name(&targ_node->dev)); | |
727 | return ret; | |
728 | } | |
729 | ||
76b67ed9 KH |
730 | int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) |
731 | { | |
8a25a2fd | 732 | struct device *obj; |
b9d52dad AC |
733 | |
734 | if (!node_online(nid)) | |
735 | return 0; | |
736 | ||
8a25a2fd | 737 | obj = get_cpu_device(cpu); |
b9d52dad AC |
738 | if (!obj) |
739 | return 0; | |
740 | ||
8732794b | 741 | sysfs_remove_link(&node_devices[nid]->dev.kobj, |
b9d52dad | 742 | kobject_name(&obj->kobj)); |
1830794a | 743 | sysfs_remove_link(&obj->kobj, |
8732794b | 744 | kobject_name(&node_devices[nid]->dev.kobj)); |
b9d52dad | 745 | |
76b67ed9 KH |
746 | return 0; |
747 | } | |
748 | ||
c04fc586 | 749 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
bd721ea7 | 750 | static int __ref get_nid_for_pfn(unsigned long pfn) |
c04fc586 | 751 | { |
c04fc586 GH |
752 | if (!pfn_valid_within(pfn)) |
753 | return -1; | |
3a80a7fa | 754 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
8cdde385 | 755 | if (system_state < SYSTEM_RUNNING) |
3a80a7fa MG |
756 | return early_pfn_to_nid(pfn); |
757 | #endif | |
c04fc586 GH |
758 | return pfn_to_nid(pfn); |
759 | } | |
760 | ||
761 | /* register memory section under specified node if it spans that node */ | |
8d595c4c DH |
762 | static int register_mem_sect_under_node(struct memory_block *mem_blk, |
763 | void *arg) | |
c04fc586 | 764 | { |
b6c88d3b DH |
765 | unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE; |
766 | unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr); | |
767 | unsigned long end_pfn = start_pfn + memory_block_pfns - 1; | |
4fbce633 | 768 | int ret, nid = *(int *)arg; |
b6c88d3b | 769 | unsigned long pfn; |
c04fc586 | 770 | |
b6c88d3b | 771 | for (pfn = start_pfn; pfn <= end_pfn; pfn++) { |
c04fc586 GH |
772 | int page_nid; |
773 | ||
04697858 YL |
774 | /* |
775 | * memory block could have several absent sections from start. | |
776 | * skip pfn range from absent section | |
777 | */ | |
778 | if (!pfn_present(pfn)) { | |
779 | pfn = round_down(pfn + PAGES_PER_SECTION, | |
780 | PAGES_PER_SECTION) - 1; | |
781 | continue; | |
782 | } | |
783 | ||
fc44f7f9 PT |
784 | /* |
785 | * We need to check if page belongs to nid only for the boot | |
786 | * case, during hotplug we know that all pages in the memory | |
787 | * block belong to the same node. | |
788 | */ | |
4fbce633 | 789 | if (system_state == SYSTEM_BOOTING) { |
fc44f7f9 PT |
790 | page_nid = get_nid_for_pfn(pfn); |
791 | if (page_nid < 0) | |
792 | continue; | |
793 | if (page_nid != nid) | |
794 | continue; | |
795 | } | |
d84f2f5a DH |
796 | |
797 | /* | |
798 | * If this memory block spans multiple nodes, we only indicate | |
799 | * the last processed node. | |
800 | */ | |
801 | mem_blk->nid = nid; | |
802 | ||
8732794b | 803 | ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj, |
10fbcf4c KS |
804 | &mem_blk->dev.kobj, |
805 | kobject_name(&mem_blk->dev.kobj)); | |
dee5d0d5 AC |
806 | if (ret) |
807 | return ret; | |
808 | ||
10fbcf4c | 809 | return sysfs_create_link_nowarn(&mem_blk->dev.kobj, |
8732794b WC |
810 | &node_devices[nid]->dev.kobj, |
811 | kobject_name(&node_devices[nid]->dev.kobj)); | |
c04fc586 GH |
812 | } |
813 | /* mem section does not span the specified node */ | |
814 | return 0; | |
815 | } | |
816 | ||
4c4b7f9b | 817 | /* |
d84f2f5a DH |
818 | * Unregister a memory block device under the node it spans. Memory blocks |
819 | * with multiple nodes cannot be offlined and therefore also never be removed. | |
4c4b7f9b | 820 | */ |
a31b264c | 821 | void unregister_memory_block_under_nodes(struct memory_block *mem_blk) |
c04fc586 | 822 | { |
d84f2f5a DH |
823 | if (mem_blk->nid == NUMA_NO_NODE) |
824 | return; | |
c04fc586 | 825 | |
d84f2f5a DH |
826 | sysfs_remove_link(&node_devices[mem_blk->nid]->dev.kobj, |
827 | kobject_name(&mem_blk->dev.kobj)); | |
828 | sysfs_remove_link(&mem_blk->dev.kobj, | |
829 | kobject_name(&node_devices[mem_blk->nid]->dev.kobj)); | |
c04fc586 GH |
830 | } |
831 | ||
4fbce633 | 832 | int link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn) |
c04fc586 | 833 | { |
fbcf73ce DH |
834 | return walk_memory_blocks(PFN_PHYS(start_pfn), |
835 | PFN_PHYS(end_pfn - start_pfn), (void *)&nid, | |
836 | register_mem_sect_under_node); | |
c04fc586 | 837 | } |
4faf8d95 | 838 | |
39da08cb | 839 | #ifdef CONFIG_HUGETLBFS |
4faf8d95 LS |
840 | /* |
841 | * Handle per node hstate attribute [un]registration on transistions | |
842 | * to/from memoryless state. | |
843 | */ | |
39da08cb LS |
844 | static void node_hugetlb_work(struct work_struct *work) |
845 | { | |
846 | struct node *node = container_of(work, struct node, node_work); | |
847 | ||
848 | /* | |
849 | * We only get here when a node transitions to/from memoryless state. | |
850 | * We can detect which transition occurred by examining whether the | |
851 | * node has memory now. hugetlb_register_node() already check this | |
852 | * so we try to register the attributes. If that fails, then the | |
853 | * node has transitioned to memoryless, try to unregister the | |
854 | * attributes. | |
855 | */ | |
856 | if (!hugetlb_register_node(node)) | |
857 | hugetlb_unregister_node(node); | |
858 | } | |
859 | ||
860 | static void init_node_hugetlb_work(int nid) | |
861 | { | |
8732794b | 862 | INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work); |
39da08cb | 863 | } |
4faf8d95 LS |
864 | |
865 | static int node_memory_callback(struct notifier_block *self, | |
866 | unsigned long action, void *arg) | |
867 | { | |
868 | struct memory_notify *mnb = arg; | |
869 | int nid = mnb->status_change_nid; | |
870 | ||
871 | switch (action) { | |
39da08cb LS |
872 | case MEM_ONLINE: |
873 | case MEM_OFFLINE: | |
874 | /* | |
875 | * offload per node hstate [un]registration to a work thread | |
876 | * when transitioning to/from memoryless state. | |
877 | */ | |
4faf8d95 | 878 | if (nid != NUMA_NO_NODE) |
8732794b | 879 | schedule_work(&node_devices[nid]->node_work); |
4faf8d95 | 880 | break; |
39da08cb | 881 | |
4faf8d95 LS |
882 | case MEM_GOING_ONLINE: |
883 | case MEM_GOING_OFFLINE: | |
884 | case MEM_CANCEL_ONLINE: | |
885 | case MEM_CANCEL_OFFLINE: | |
886 | default: | |
887 | break; | |
888 | } | |
889 | ||
890 | return NOTIFY_OK; | |
891 | } | |
39da08cb | 892 | #endif /* CONFIG_HUGETLBFS */ |
9037a993 | 893 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
4faf8d95 | 894 | |
39da08cb LS |
895 | #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \ |
896 | !defined(CONFIG_HUGETLBFS) | |
4faf8d95 LS |
897 | static inline int node_memory_callback(struct notifier_block *self, |
898 | unsigned long action, void *arg) | |
899 | { | |
900 | return NOTIFY_OK; | |
901 | } | |
39da08cb LS |
902 | |
903 | static void init_node_hugetlb_work(int nid) { } | |
904 | ||
905 | #endif | |
c04fc586 | 906 | |
9037a993 | 907 | int __register_one_node(int nid) |
0fc44159 | 908 | { |
9037a993 | 909 | int error; |
76b67ed9 | 910 | int cpu; |
0fc44159 | 911 | |
9037a993 MH |
912 | node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL); |
913 | if (!node_devices[nid]) | |
914 | return -ENOMEM; | |
c04fc586 | 915 | |
a7be6e5a | 916 | error = register_node(node_devices[nid], nid); |
39da08cb | 917 | |
9037a993 MH |
918 | /* link cpu under this node */ |
919 | for_each_present_cpu(cpu) { | |
920 | if (cpu_to_node(cpu) == nid) | |
921 | register_cpu_under_node(cpu, nid); | |
0fc44159 YG |
922 | } |
923 | ||
08d9dbe7 | 924 | INIT_LIST_HEAD(&node_devices[nid]->access_list); |
9037a993 MH |
925 | /* initialize work queue for memory hot plug */ |
926 | init_node_hugetlb_work(nid); | |
acc02a10 | 927 | node_init_caches(nid); |
0fc44159 | 928 | |
9037a993 | 929 | return error; |
0fc44159 YG |
930 | } |
931 | ||
932 | void unregister_one_node(int nid) | |
933 | { | |
92d585ef XQ |
934 | if (!node_devices[nid]) |
935 | return; | |
936 | ||
8732794b | 937 | unregister_node(node_devices[nid]); |
8732794b | 938 | node_devices[nid] = NULL; |
0fc44159 YG |
939 | } |
940 | ||
bde631a5 LS |
941 | /* |
942 | * node states attributes | |
943 | */ | |
944 | ||
945 | static ssize_t print_nodes_state(enum node_states state, char *buf) | |
946 | { | |
947 | int n; | |
948 | ||
f799b1a7 TH |
949 | n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", |
950 | nodemask_pr_args(&node_states[state])); | |
f6238818 RO |
951 | buf[n++] = '\n'; |
952 | buf[n] = '\0'; | |
bde631a5 LS |
953 | return n; |
954 | } | |
955 | ||
b15f562f | 956 | struct node_attr { |
10fbcf4c | 957 | struct device_attribute attr; |
b15f562f AK |
958 | enum node_states state; |
959 | }; | |
bde631a5 | 960 | |
10fbcf4c KS |
961 | static ssize_t show_node_state(struct device *dev, |
962 | struct device_attribute *attr, char *buf) | |
bde631a5 | 963 | { |
b15f562f AK |
964 | struct node_attr *na = container_of(attr, struct node_attr, attr); |
965 | return print_nodes_state(na->state, buf); | |
bde631a5 LS |
966 | } |
967 | ||
b15f562f | 968 | #define _NODE_ATTR(name, state) \ |
10fbcf4c | 969 | { __ATTR(name, 0444, show_node_state, NULL), state } |
bde631a5 | 970 | |
b15f562f | 971 | static struct node_attr node_state_attr[] = { |
fcf07d22 LJ |
972 | [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE), |
973 | [N_ONLINE] = _NODE_ATTR(online, N_ONLINE), | |
974 | [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), | |
bde631a5 | 975 | #ifdef CONFIG_HIGHMEM |
fcf07d22 | 976 | [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY), |
20b2f52b | 977 | #endif |
20b2f52b | 978 | [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY), |
fcf07d22 | 979 | [N_CPU] = _NODE_ATTR(has_cpu, N_CPU), |
bde631a5 LS |
980 | }; |
981 | ||
10fbcf4c | 982 | static struct attribute *node_state_attrs[] = { |
fcf07d22 LJ |
983 | &node_state_attr[N_POSSIBLE].attr.attr, |
984 | &node_state_attr[N_ONLINE].attr.attr, | |
985 | &node_state_attr[N_NORMAL_MEMORY].attr.attr, | |
3701cde6 | 986 | #ifdef CONFIG_HIGHMEM |
fcf07d22 | 987 | &node_state_attr[N_HIGH_MEMORY].attr.attr, |
20b2f52b | 988 | #endif |
20b2f52b | 989 | &node_state_attr[N_MEMORY].attr.attr, |
fcf07d22 | 990 | &node_state_attr[N_CPU].attr.attr, |
3701cde6 AK |
991 | NULL |
992 | }; | |
bde631a5 | 993 | |
10fbcf4c KS |
994 | static struct attribute_group memory_root_attr_group = { |
995 | .attrs = node_state_attrs, | |
996 | }; | |
997 | ||
998 | static const struct attribute_group *cpu_root_attr_groups[] = { | |
999 | &memory_root_attr_group, | |
1000 | NULL, | |
1001 | }; | |
1002 | ||
4faf8d95 | 1003 | #define NODE_CALLBACK_PRI 2 /* lower than SLAB */ |
4b45099b | 1004 | static int __init register_node_type(void) |
1da177e4 | 1005 | { |
bde631a5 LS |
1006 | int ret; |
1007 | ||
3701cde6 AK |
1008 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); |
1009 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); | |
1010 | ||
10fbcf4c | 1011 | ret = subsys_system_register(&node_subsys, cpu_root_attr_groups); |
4faf8d95 | 1012 | if (!ret) { |
6e259e7d AM |
1013 | static struct notifier_block node_memory_callback_nb = { |
1014 | .notifier_call = node_memory_callback, | |
1015 | .priority = NODE_CALLBACK_PRI, | |
1016 | }; | |
1017 | register_hotmemory_notifier(&node_memory_callback_nb); | |
4faf8d95 | 1018 | } |
bde631a5 LS |
1019 | |
1020 | /* | |
1021 | * Note: we're not going to unregister the node class if we fail | |
1022 | * to register the node state class attribute files. | |
1023 | */ | |
1024 | return ret; | |
1da177e4 LT |
1025 | } |
1026 | postcore_initcall(register_node_type); |