projects/linux·blob v2.6.39 · refs

648 lines · 17.3 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/memory.h>
10#include <linux/node.h>
11#include <linux/hugetlb.h>
12#include <linux/compaction.h>
13#include <linux/cpumask.h>
14#include <linux/topology.h>
15#include <linux/nodemask.h>
16#include <linux/cpu.h>
17#include <linux/device.h>
18#include <linux/swap.h>
19#include <linux/slab.h>
20
21static struct sysdev_class_attribute *node_state_attrs[];
22
23static struct sysdev_class node_class = {
24 .name = "node",
25 .attrs = node_state_attrs,
26};
27
28
29static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
30{
31 struct node *node_dev = to_node(dev);
32 const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id);
33 int len;
34
35 /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
36 BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
37
38 len = type?
39 cpulist_scnprintf(buf, PAGE_SIZE-2, mask) :
40 cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
41 buf[len++] = '\n';
42 buf[len] = '\0';
43 return len;
44}
45
46static inline ssize_t node_read_cpumask(struct sys_device *dev,
47 struct sysdev_attribute *attr, char *buf)
48{
49 return node_read_cpumap(dev, 0, buf);
50}
51static inline ssize_t node_read_cpulist(struct sys_device *dev,
52 struct sysdev_attribute *attr, char *buf)
53{
54 return node_read_cpumap(dev, 1, buf);
55}
56
57static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
58static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
59
60#define K(x) ((x) << (PAGE_SHIFT - 10))
61static ssize_t node_read_meminfo(struct sys_device * dev,
62 struct sysdev_attribute *attr, char * buf)
63{
64 int n;
65 int nid = dev->id;
66 struct sysinfo i;
67
68 si_meminfo_node(&i, nid);
69 n = sprintf(buf,
70 "Node %d MemTotal: %8lu kB\n"
71 "Node %d MemFree: %8lu kB\n"
72 "Node %d MemUsed: %8lu kB\n"
73 "Node %d Active: %8lu kB\n"
74 "Node %d Inactive: %8lu kB\n"
75 "Node %d Active(anon): %8lu kB\n"
76 "Node %d Inactive(anon): %8lu kB\n"
77 "Node %d Active(file): %8lu kB\n"
78 "Node %d Inactive(file): %8lu kB\n"
79 "Node %d Unevictable: %8lu kB\n"
80 "Node %d Mlocked: %8lu kB\n",
81 nid, K(i.totalram),
82 nid, K(i.freeram),
83 nid, K(i.totalram - i.freeram),
84 nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
85 node_page_state(nid, NR_ACTIVE_FILE)),
86 nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
87 node_page_state(nid, NR_INACTIVE_FILE)),
88 nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
89 nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
90 nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
91 nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
92 nid, K(node_page_state(nid, NR_UNEVICTABLE)),
93 nid, K(node_page_state(nid, NR_MLOCK)));
94
95#ifdef CONFIG_HIGHMEM
96 n += sprintf(buf + n,
97 "Node %d HighTotal: %8lu kB\n"
98 "Node %d HighFree: %8lu kB\n"
99 "Node %d LowTotal: %8lu kB\n"
100 "Node %d LowFree: %8lu kB\n",
101 nid, K(i.totalhigh),
102 nid, K(i.freehigh),
103 nid, K(i.totalram - i.totalhigh),
104 nid, K(i.freeram - i.freehigh));
105#endif
106 n += sprintf(buf + n,
107 "Node %d Dirty: %8lu kB\n"
108 "Node %d Writeback: %8lu kB\n"
109 "Node %d FilePages: %8lu kB\n"
110 "Node %d Mapped: %8lu kB\n"
111 "Node %d AnonPages: %8lu kB\n"
112 "Node %d Shmem: %8lu kB\n"
113 "Node %d KernelStack: %8lu kB\n"
114 "Node %d PageTables: %8lu kB\n"
115 "Node %d NFS_Unstable: %8lu kB\n"
116 "Node %d Bounce: %8lu kB\n"
117 "Node %d WritebackTmp: %8lu kB\n"
118 "Node %d Slab: %8lu kB\n"
119 "Node %d SReclaimable: %8lu kB\n"
120 "Node %d SUnreclaim: %8lu kB\n"
121#ifdef CONFIG_TRANSPARENT_HUGEPAGE
122 "Node %d AnonHugePages: %8lu kB\n"
123#endif
124 ,
125 nid, K(node_page_state(nid, NR_FILE_DIRTY)),
126 nid, K(node_page_state(nid, NR_WRITEBACK)),
127 nid, K(node_page_state(nid, NR_FILE_PAGES)),
128 nid, K(node_page_state(nid, NR_FILE_MAPPED)),
129 nid, K(node_page_state(nid, NR_ANON_PAGES)
130#ifdef CONFIG_TRANSPARENT_HUGEPAGE
131 + node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) *
132 HPAGE_PMD_NR
133#endif
134 ),
135 nid, K(node_page_state(nid, NR_SHMEM)),
136 nid, node_page_state(nid, NR_KERNEL_STACK) *
137 THREAD_SIZE / 1024,
138 nid, K(node_page_state(nid, NR_PAGETABLE)),
139 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
140 nid, K(node_page_state(nid, NR_BOUNCE)),
141 nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
142 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
143 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
144 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
145 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))
146#ifdef CONFIG_TRANSPARENT_HUGEPAGE
147 , nid,
148 K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) *
149 HPAGE_PMD_NR)
150#endif
151 );
152 n += hugetlb_report_node_meminfo(nid, buf + n);
153 return n;
154}
155
156#undef K
157static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
158
159static ssize_t node_read_numastat(struct sys_device * dev,
160 struct sysdev_attribute *attr, char * buf)
161{
162 return sprintf(buf,
163 "numa_hit %lu\n"
164 "numa_miss %lu\n"
165 "numa_foreign %lu\n"
166 "interleave_hit %lu\n"
167 "local_node %lu\n"
168 "other_node %lu\n",
169 node_page_state(dev->id, NUMA_HIT),
170 node_page_state(dev->id, NUMA_MISS),
171 node_page_state(dev->id, NUMA_FOREIGN),
172 node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
173 node_page_state(dev->id, NUMA_LOCAL),
174 node_page_state(dev->id, NUMA_OTHER));
175}
176static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
177
178static ssize_t node_read_vmstat(struct sys_device *dev,
179 struct sysdev_attribute *attr, char *buf)
180{
181 int nid = dev->id;
182 return sprintf(buf,
183 "nr_written %lu\n"
184 "nr_dirtied %lu\n",
185 node_page_state(nid, NR_WRITTEN),
186 node_page_state(nid, NR_DIRTIED));
187}
188static SYSDEV_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL);
189
190static ssize_t node_read_distance(struct sys_device * dev,
191 struct sysdev_attribute *attr, char * buf)
192{
193 int nid = dev->id;
194 int len = 0;
195 int i;
196
197 /*
198 * buf is currently PAGE_SIZE in length and each node needs 4 chars
199 * at the most (distance + space or newline).
200 */
201 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);
202
203 for_each_online_node(i)
204 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
205
206 len += sprintf(buf + len, "\n");
207 return len;
208}
209static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
210
211#ifdef CONFIG_HUGETLBFS
212/*
213 * hugetlbfs per node attributes registration interface:
214 * When/if hugetlb[fs] subsystem initializes [sometime after this module],
215 * it will register its per node attributes for all online nodes with
216 * memory. It will also call register_hugetlbfs_with_node(), below, to
217 * register its attribute registration functions with this node driver.
218 * Once these hooks have been initialized, the node driver will call into
219 * the hugetlb module to [un]register attributes for hot-plugged nodes.
220 */
221static node_registration_func_t __hugetlb_register_node;
222static node_registration_func_t __hugetlb_unregister_node;
223
224static inline bool hugetlb_register_node(struct node *node)
225{
226 if (__hugetlb_register_node &&
227 node_state(node->sysdev.id, N_HIGH_MEMORY)) {
228 __hugetlb_register_node(node);
229 return true;
230 }
231 return false;
232}
233
234static inline void hugetlb_unregister_node(struct node *node)
235{
236 if (__hugetlb_unregister_node)
237 __hugetlb_unregister_node(node);
238}
239
240void register_hugetlbfs_with_node(node_registration_func_t doregister,
241 node_registration_func_t unregister)
242{
243 __hugetlb_register_node = doregister;
244 __hugetlb_unregister_node = unregister;
245}
246#else
247static inline void hugetlb_register_node(struct node *node) {}
248
249static inline void hugetlb_unregister_node(struct node *node) {}
250#endif
251
252
253/*
254 * register_node - Setup a sysfs device for a node.
255 * @num - Node number to use when creating the device.
256 *
257 * Initialize and register the node device.
258 */
259int register_node(struct node *node, int num, struct node *parent)
260{
261 int error;
262
263 node->sysdev.id = num;
264 node->sysdev.cls = &node_class;
265 error = sysdev_register(&node->sysdev);
266
267 if (!error){
268 sysdev_create_file(&node->sysdev, &attr_cpumap);
269 sysdev_create_file(&node->sysdev, &attr_cpulist);
270 sysdev_create_file(&node->sysdev, &attr_meminfo);
271 sysdev_create_file(&node->sysdev, &attr_numastat);
272 sysdev_create_file(&node->sysdev, &attr_distance);
273 sysdev_create_file(&node->sysdev, &attr_vmstat);
274
275 scan_unevictable_register_node(node);
276
277 hugetlb_register_node(node);
278
279 compaction_register_node(node);
280 }
281 return error;
282}
283
284/**
285 * unregister_node - unregister a node device
286 * @node: node going away
287 *
288 * Unregisters a node device @node. All the devices on the node must be
289 * unregistered before calling this function.
290 */
291void unregister_node(struct node *node)
292{
293 sysdev_remove_file(&node->sysdev, &attr_cpumap);
294 sysdev_remove_file(&node->sysdev, &attr_cpulist);
295 sysdev_remove_file(&node->sysdev, &attr_meminfo);
296 sysdev_remove_file(&node->sysdev, &attr_numastat);
297 sysdev_remove_file(&node->sysdev, &attr_distance);
298 sysdev_remove_file(&node->sysdev, &attr_vmstat);
299
300 scan_unevictable_unregister_node(node);
301 hugetlb_unregister_node(node); /* no-op, if memoryless node */
302
303 sysdev_unregister(&node->sysdev);
304}
305
306struct node node_devices[MAX_NUMNODES];
307
308/*
309 * register cpu under node
310 */
311int register_cpu_under_node(unsigned int cpu, unsigned int nid)
312{
313 int ret;
314 struct sys_device *obj;
315
316 if (!node_online(nid))
317 return 0;
318
319 obj = get_cpu_sysdev(cpu);
320 if (!obj)
321 return 0;
322
323 ret = sysfs_create_link(&node_devices[nid].sysdev.kobj,
324 &obj->kobj,
325 kobject_name(&obj->kobj));
326 if (ret)
327 return ret;
328
329 return sysfs_create_link(&obj->kobj,
330 &node_devices[nid].sysdev.kobj,
331 kobject_name(&node_devices[nid].sysdev.kobj));
332}
333
334int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
335{
336 struct sys_device *obj;
337
338 if (!node_online(nid))
339 return 0;
340
341 obj = get_cpu_sysdev(cpu);
342 if (!obj)
343 return 0;
344
345 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
346 kobject_name(&obj->kobj));
347 sysfs_remove_link(&obj->kobj,
348 kobject_name(&node_devices[nid].sysdev.kobj));
349
350 return 0;
351}
352
353#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
354#define page_initialized(page) (page->lru.next)
355
356static int get_nid_for_pfn(unsigned long pfn)
357{
358 struct page *page;
359
360 if (!pfn_valid_within(pfn))
361 return -1;
362 page = pfn_to_page(pfn);
363 if (!page_initialized(page))
364 return -1;
365 return pfn_to_nid(pfn);
366}
367
368/* register memory section under specified node if it spans that node */
369int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
370{
371 int ret;
372 unsigned long pfn, sect_start_pfn, sect_end_pfn;
373
374 if (!mem_blk)
375 return -EFAULT;
376 if (!node_online(nid))
377 return 0;
378
379 sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
380 sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr);
381 sect_end_pfn += PAGES_PER_SECTION - 1;
382 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
383 int page_nid;
384
385 page_nid = get_nid_for_pfn(pfn);
386 if (page_nid < 0)
387 continue;
388 if (page_nid != nid)
389 continue;
390 ret = sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
391 &mem_blk->sysdev.kobj,
392 kobject_name(&mem_blk->sysdev.kobj));
393 if (ret)
394 return ret;
395
396 return sysfs_create_link_nowarn(&mem_blk->sysdev.kobj,
397 &node_devices[nid].sysdev.kobj,
398 kobject_name(&node_devices[nid].sysdev.kobj));
399 }
400 /* mem section does not span the specified node */
401 return 0;
402}
403
404/* unregister memory section under all nodes that it spans */
405int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
406 unsigned long phys_index)
407{
408 NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
409 unsigned long pfn, sect_start_pfn, sect_end_pfn;
410
411 if (!mem_blk) {
412 NODEMASK_FREE(unlinked_nodes);
413 return -EFAULT;
414 }
415 if (!unlinked_nodes)
416 return -ENOMEM;
417 nodes_clear(*unlinked_nodes);
418
419 sect_start_pfn = section_nr_to_pfn(phys_index);
420 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
421 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
422 int nid;
423
424 nid = get_nid_for_pfn(pfn);
425 if (nid < 0)
426 continue;
427 if (!node_online(nid))
428 continue;
429 if (node_test_and_set(nid, *unlinked_nodes))
430 continue;
431 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
432 kobject_name(&mem_blk->sysdev.kobj));
433 sysfs_remove_link(&mem_blk->sysdev.kobj,
434 kobject_name(&node_devices[nid].sysdev.kobj));
435 }
436 NODEMASK_FREE(unlinked_nodes);
437 return 0;
438}
439
440static int link_mem_sections(int nid)
441{
442 unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
443 unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
444 unsigned long pfn;
445 struct memory_block *mem_blk = NULL;
446 int err = 0;
447
448 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
449 unsigned long section_nr = pfn_to_section_nr(pfn);
450 struct mem_section *mem_sect;
451 int ret;
452
453 if (!present_section_nr(section_nr))
454 continue;
455 mem_sect = __nr_to_section(section_nr);
456 mem_blk = find_memory_block_hinted(mem_sect, mem_blk);
457 ret = register_mem_sect_under_node(mem_blk, nid);
458 if (!err)
459 err = ret;
460
461 /* discard ref obtained in find_memory_block() */
462 }
463
464 if (mem_blk)
465 kobject_put(&mem_blk->sysdev.kobj);
466 return err;
467}
468
469#ifdef CONFIG_HUGETLBFS
470/*
471 * Handle per node hstate attribute [un]registration on transistions
472 * to/from memoryless state.
473 */
474static void node_hugetlb_work(struct work_struct *work)
475{
476 struct node *node = container_of(work, struct node, node_work);
477
478 /*
479 * We only get here when a node transitions to/from memoryless state.
480 * We can detect which transition occurred by examining whether the
481 * node has memory now. hugetlb_register_node() already check this
482 * so we try to register the attributes. If that fails, then the
483 * node has transitioned to memoryless, try to unregister the
484 * attributes.
485 */
486 if (!hugetlb_register_node(node))
487 hugetlb_unregister_node(node);
488}
489
490static void init_node_hugetlb_work(int nid)
491{
492 INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work);
493}
494
495static int node_memory_callback(struct notifier_block *self,
496 unsigned long action, void *arg)
497{
498 struct memory_notify *mnb = arg;
499 int nid = mnb->status_change_nid;
500
501 switch (action) {
502 case MEM_ONLINE:
503 case MEM_OFFLINE:
504 /*
505 * offload per node hstate [un]registration to a work thread
506 * when transitioning to/from memoryless state.
507 */
508 if (nid != NUMA_NO_NODE)
509 schedule_work(&node_devices[nid].node_work);
510 break;
511
512 case MEM_GOING_ONLINE:
513 case MEM_GOING_OFFLINE:
514 case MEM_CANCEL_ONLINE:
515 case MEM_CANCEL_OFFLINE:
516 default:
517 break;
518 }
519
520 return NOTIFY_OK;
521}
522#endif /* CONFIG_HUGETLBFS */
523#else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */
524
525static int link_mem_sections(int nid) { return 0; }
526#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
527
528#if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
529 !defined(CONFIG_HUGETLBFS)
530static inline int node_memory_callback(struct notifier_block *self,
531 unsigned long action, void *arg)
532{
533 return NOTIFY_OK;
534}
535
536static void init_node_hugetlb_work(int nid) { }
537
538#endif
539
540int register_one_node(int nid)
541{
542 int error = 0;
543 int cpu;
544
545 if (node_online(nid)) {
546 int p_node = parent_node(nid);
547 struct node *parent = NULL;
548
549 if (p_node != nid)
550 parent = &node_devices[p_node];
551
552 error = register_node(&node_devices[nid], nid, parent);
553
554 /* link cpu under this node */
555 for_each_present_cpu(cpu) {
556 if (cpu_to_node(cpu) == nid)
557 register_cpu_under_node(cpu, nid);
558 }
559
560 /* link memory sections under this node */
561 error = link_mem_sections(nid);
562
563 /* initialize work queue for memory hot plug */
564 init_node_hugetlb_work(nid);
565 }
566
567 return error;
568
569}
570
571void unregister_one_node(int nid)
572{
573 unregister_node(&node_devices[nid]);
574}
575
576/*
577 * node states attributes
578 */
579
580static ssize_t print_nodes_state(enum node_states state, char *buf)
581{
582 int n;
583
584 n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
585 if (n > 0 && PAGE_SIZE > n + 1) {
586 *(buf + n++) = '\n';
587 *(buf + n++) = '\0';
588 }
589 return n;
590}
591
592struct node_attr {
593 struct sysdev_class_attribute attr;
594 enum node_states state;
595};
596
597static ssize_t show_node_state(struct sysdev_class *class,
598 struct sysdev_class_attribute *attr, char *buf)
599{
600 struct node_attr *na = container_of(attr, struct node_attr, attr);
601 return print_nodes_state(na->state, buf);
602}
603
604#define _NODE_ATTR(name, state) \
605 { _SYSDEV_CLASS_ATTR(name, 0444, show_node_state, NULL), state }
606
607static struct node_attr node_state_attr[] = {
608 _NODE_ATTR(possible, N_POSSIBLE),
609 _NODE_ATTR(online, N_ONLINE),
610 _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
611 _NODE_ATTR(has_cpu, N_CPU),
612#ifdef CONFIG_HIGHMEM
613 _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
614#endif
615};
616
617static struct sysdev_class_attribute *node_state_attrs[] = {
618 &node_state_attr[0].attr,
619 &node_state_attr[1].attr,
620 &node_state_attr[2].attr,
621 &node_state_attr[3].attr,
622#ifdef CONFIG_HIGHMEM
623 &node_state_attr[4].attr,
624#endif
625 NULL
626};
627
628#define NODE_CALLBACK_PRI 2 /* lower than SLAB */
629static int __init register_node_type(void)
630{
631 int ret;
632
633 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
634 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
635
636 ret = sysdev_class_register(&node_class);
637 if (!ret) {
638 hotplug_memory_notifier(node_memory_callback,
639 NODE_CALLBACK_PRI);
640 }
641
642 /*
643 * Note: we're not going to unregister the node class if we fail
644 * to register the node state class attribute files.
645 */
646 return ret;
647}
648postcore_initcall(register_node_type);