2 * drivers/base/node.c - basic Node class support
5 #include <linux/sysdev.h>
6 #include <linux/module.h>
7 #include <linux/init.h>
9 #include <linux/memory.h>
10 #include <linux/vmstat.h>
11 #include <linux/node.h>
12 #include <linux/hugetlb.h>
13 #include <linux/compaction.h>
14 #include <linux/cpumask.h>
15 #include <linux/topology.h>
16 #include <linux/nodemask.h>
17 #include <linux/cpu.h>
18 #include <linux/device.h>
19 #include <linux/swap.h>
20 #include <linux/slab.h>
22 static struct sysdev_class_attribute *node_state_attrs[];
24 static struct sysdev_class node_class = {
26 .attrs = node_state_attrs,
30 static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
32 struct node *node_dev = to_node(dev);
33 const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id);
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));
40 cpulist_scnprintf(buf, PAGE_SIZE-2, mask) :
41 cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
47 static inline ssize_t node_read_cpumask(struct sys_device *dev,
48 struct sysdev_attribute *attr, char *buf)
50 return node_read_cpumap(dev, 0, buf);
52 static inline ssize_t node_read_cpulist(struct sys_device *dev,
53 struct sysdev_attribute *attr, char *buf)
55 return node_read_cpumap(dev, 1, buf);
58 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
59 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
61 #define K(x) ((x) << (PAGE_SHIFT - 10))
62 static ssize_t node_read_meminfo(struct sys_device * dev,
63 struct sysdev_attribute *attr, char * buf)
69 si_meminfo_node(&i, nid);
71 "Node %d MemTotal: %8lu kB\n"
72 "Node %d MemFree: %8lu kB\n"
73 "Node %d MemUsed: %8lu kB\n"
74 "Node %d Active: %8lu kB\n"
75 "Node %d Inactive: %8lu kB\n"
76 "Node %d Active(anon): %8lu kB\n"
77 "Node %d Inactive(anon): %8lu kB\n"
78 "Node %d Active(file): %8lu kB\n"
79 "Node %d Inactive(file): %8lu kB\n"
80 "Node %d Unevictable: %8lu kB\n"
81 "Node %d Mlocked: %8lu kB\n",
84 nid, K(i.totalram - i.freeram),
85 nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
86 node_page_state(nid, NR_ACTIVE_FILE)),
87 nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
88 node_page_state(nid, NR_INACTIVE_FILE)),
89 nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
90 nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
91 nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
92 nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
93 nid, K(node_page_state(nid, NR_UNEVICTABLE)),
94 nid, K(node_page_state(nid, NR_MLOCK)));
98 "Node %d HighTotal: %8lu kB\n"
99 "Node %d HighFree: %8lu kB\n"
100 "Node %d LowTotal: %8lu kB\n"
101 "Node %d LowFree: %8lu kB\n",
104 nid, K(i.totalram - i.totalhigh),
105 nid, K(i.freeram - i.freehigh));
107 n += sprintf(buf + n,
108 "Node %d Dirty: %8lu kB\n"
109 "Node %d Writeback: %8lu kB\n"
110 "Node %d FilePages: %8lu kB\n"
111 "Node %d Mapped: %8lu kB\n"
112 "Node %d AnonPages: %8lu kB\n"
113 "Node %d Shmem: %8lu kB\n"
114 "Node %d KernelStack: %8lu kB\n"
115 "Node %d PageTables: %8lu kB\n"
116 "Node %d NFS_Unstable: %8lu kB\n"
117 "Node %d Bounce: %8lu kB\n"
118 "Node %d WritebackTmp: %8lu kB\n"
119 "Node %d Slab: %8lu kB\n"
120 "Node %d SReclaimable: %8lu kB\n"
121 "Node %d SUnreclaim: %8lu kB\n"
122 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
123 "Node %d AnonHugePages: %8lu kB\n"
126 nid, K(node_page_state(nid, NR_FILE_DIRTY)),
127 nid, K(node_page_state(nid, NR_WRITEBACK)),
128 nid, K(node_page_state(nid, NR_FILE_PAGES)),
129 nid, K(node_page_state(nid, NR_FILE_MAPPED)),
130 nid, K(node_page_state(nid, NR_ANON_PAGES)
131 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
132 + node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) *
136 nid, K(node_page_state(nid, NR_SHMEM)),
137 nid, node_page_state(nid, NR_KERNEL_STACK) *
139 nid, K(node_page_state(nid, NR_PAGETABLE)),
140 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
141 nid, K(node_page_state(nid, NR_BOUNCE)),
142 nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
143 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
144 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
145 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
146 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))
147 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
149 K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) *
153 n += hugetlb_report_node_meminfo(nid, buf + n);
158 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
160 static ssize_t node_read_numastat(struct sys_device * dev,
161 struct sysdev_attribute *attr, char * buf)
167 "interleave_hit %lu\n"
170 node_page_state(dev->id, NUMA_HIT),
171 node_page_state(dev->id, NUMA_MISS),
172 node_page_state(dev->id, NUMA_FOREIGN),
173 node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
174 node_page_state(dev->id, NUMA_LOCAL),
175 node_page_state(dev->id, NUMA_OTHER));
177 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
179 static ssize_t node_read_vmstat(struct sys_device *dev,
180 struct sysdev_attribute *attr, char *buf)
186 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
187 n += sprintf(buf+n, "%s %lu\n", vmstat_text[i],
188 node_page_state(nid, i));
192 static SYSDEV_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL);
194 static ssize_t node_read_distance(struct sys_device * dev,
195 struct sysdev_attribute *attr, char * buf)
202 * buf is currently PAGE_SIZE in length and each node needs 4 chars
203 * at the most (distance + space or newline).
205 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);
207 for_each_online_node(i)
208 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
210 len += sprintf(buf + len, "\n");
213 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
215 #ifdef CONFIG_HUGETLBFS
217 * hugetlbfs per node attributes registration interface:
218 * When/if hugetlb[fs] subsystem initializes [sometime after this module],
219 * it will register its per node attributes for all online nodes with
220 * memory. It will also call register_hugetlbfs_with_node(), below, to
221 * register its attribute registration functions with this node driver.
222 * Once these hooks have been initialized, the node driver will call into
223 * the hugetlb module to [un]register attributes for hot-plugged nodes.
225 static node_registration_func_t __hugetlb_register_node;
226 static node_registration_func_t __hugetlb_unregister_node;
228 static inline bool hugetlb_register_node(struct node *node)
230 if (__hugetlb_register_node &&
231 node_state(node->sysdev.id, N_HIGH_MEMORY)) {
232 __hugetlb_register_node(node);
238 static inline void hugetlb_unregister_node(struct node *node)
240 if (__hugetlb_unregister_node)
241 __hugetlb_unregister_node(node);
244 void register_hugetlbfs_with_node(node_registration_func_t doregister,
245 node_registration_func_t unregister)
247 __hugetlb_register_node = doregister;
248 __hugetlb_unregister_node = unregister;
251 static inline void hugetlb_register_node(struct node *node) {}
253 static inline void hugetlb_unregister_node(struct node *node) {}
258 * register_node - Setup a sysfs device for a node.
259 * @num - Node number to use when creating the device.
261 * Initialize and register the node device.
263 int register_node(struct node *node, int num, struct node *parent)
267 node->sysdev.id = num;
268 node->sysdev.cls = &node_class;
269 error = sysdev_register(&node->sysdev);
272 sysdev_create_file(&node->sysdev, &attr_cpumap);
273 sysdev_create_file(&node->sysdev, &attr_cpulist);
274 sysdev_create_file(&node->sysdev, &attr_meminfo);
275 sysdev_create_file(&node->sysdev, &attr_numastat);
276 sysdev_create_file(&node->sysdev, &attr_distance);
277 sysdev_create_file(&node->sysdev, &attr_vmstat);
279 scan_unevictable_register_node(node);
281 hugetlb_register_node(node);
283 compaction_register_node(node);
289 * unregister_node - unregister a node device
290 * @node: node going away
292 * Unregisters a node device @node. All the devices on the node must be
293 * unregistered before calling this function.
295 void unregister_node(struct node *node)
297 sysdev_remove_file(&node->sysdev, &attr_cpumap);
298 sysdev_remove_file(&node->sysdev, &attr_cpulist);
299 sysdev_remove_file(&node->sysdev, &attr_meminfo);
300 sysdev_remove_file(&node->sysdev, &attr_numastat);
301 sysdev_remove_file(&node->sysdev, &attr_distance);
302 sysdev_remove_file(&node->sysdev, &attr_vmstat);
304 scan_unevictable_unregister_node(node);
305 hugetlb_unregister_node(node); /* no-op, if memoryless node */
307 sysdev_unregister(&node->sysdev);
310 struct node node_devices[MAX_NUMNODES];
313 * register cpu under node
315 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
318 struct sys_device *obj;
320 if (!node_online(nid))
323 obj = get_cpu_sysdev(cpu);
327 ret = sysfs_create_link(&node_devices[nid].sysdev.kobj,
329 kobject_name(&obj->kobj));
333 return sysfs_create_link(&obj->kobj,
334 &node_devices[nid].sysdev.kobj,
335 kobject_name(&node_devices[nid].sysdev.kobj));
338 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
340 struct sys_device *obj;
342 if (!node_online(nid))
345 obj = get_cpu_sysdev(cpu);
349 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
350 kobject_name(&obj->kobj));
351 sysfs_remove_link(&obj->kobj,
352 kobject_name(&node_devices[nid].sysdev.kobj));
357 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
358 #define page_initialized(page) (page->lru.next)
360 static int get_nid_for_pfn(unsigned long pfn)
364 if (!pfn_valid_within(pfn))
366 page = pfn_to_page(pfn);
367 if (!page_initialized(page))
369 return pfn_to_nid(pfn);
372 /* register memory section under specified node if it spans that node */
373 int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
376 unsigned long pfn, sect_start_pfn, sect_end_pfn;
380 if (!node_online(nid))
383 sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
384 sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr);
385 sect_end_pfn += PAGES_PER_SECTION - 1;
386 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
389 page_nid = get_nid_for_pfn(pfn);
394 ret = sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
395 &mem_blk->sysdev.kobj,
396 kobject_name(&mem_blk->sysdev.kobj));
400 return sysfs_create_link_nowarn(&mem_blk->sysdev.kobj,
401 &node_devices[nid].sysdev.kobj,
402 kobject_name(&node_devices[nid].sysdev.kobj));
404 /* mem section does not span the specified node */
408 /* unregister memory section under all nodes that it spans */
409 int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
410 unsigned long phys_index)
412 NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
413 unsigned long pfn, sect_start_pfn, sect_end_pfn;
416 NODEMASK_FREE(unlinked_nodes);
421 nodes_clear(*unlinked_nodes);
423 sect_start_pfn = section_nr_to_pfn(phys_index);
424 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
425 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
428 nid = get_nid_for_pfn(pfn);
431 if (!node_online(nid))
433 if (node_test_and_set(nid, *unlinked_nodes))
435 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
436 kobject_name(&mem_blk->sysdev.kobj));
437 sysfs_remove_link(&mem_blk->sysdev.kobj,
438 kobject_name(&node_devices[nid].sysdev.kobj));
440 NODEMASK_FREE(unlinked_nodes);
444 static int link_mem_sections(int nid)
446 unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
447 unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
449 struct memory_block *mem_blk = NULL;
452 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
453 unsigned long section_nr = pfn_to_section_nr(pfn);
454 struct mem_section *mem_sect;
457 if (!present_section_nr(section_nr))
459 mem_sect = __nr_to_section(section_nr);
460 mem_blk = find_memory_block_hinted(mem_sect, mem_blk);
461 ret = register_mem_sect_under_node(mem_blk, nid);
465 /* discard ref obtained in find_memory_block() */
469 kobject_put(&mem_blk->sysdev.kobj);
473 #ifdef CONFIG_HUGETLBFS
475 * Handle per node hstate attribute [un]registration on transistions
476 * to/from memoryless state.
478 static void node_hugetlb_work(struct work_struct *work)
480 struct node *node = container_of(work, struct node, node_work);
483 * We only get here when a node transitions to/from memoryless state.
484 * We can detect which transition occurred by examining whether the
485 * node has memory now. hugetlb_register_node() already check this
486 * so we try to register the attributes. If that fails, then the
487 * node has transitioned to memoryless, try to unregister the
490 if (!hugetlb_register_node(node))
491 hugetlb_unregister_node(node);
494 static void init_node_hugetlb_work(int nid)
496 INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work);
499 static int node_memory_callback(struct notifier_block *self,
500 unsigned long action, void *arg)
502 struct memory_notify *mnb = arg;
503 int nid = mnb->status_change_nid;
509 * offload per node hstate [un]registration to a work thread
510 * when transitioning to/from memoryless state.
512 if (nid != NUMA_NO_NODE)
513 schedule_work(&node_devices[nid].node_work);
516 case MEM_GOING_ONLINE:
517 case MEM_GOING_OFFLINE:
518 case MEM_CANCEL_ONLINE:
519 case MEM_CANCEL_OFFLINE:
526 #endif /* CONFIG_HUGETLBFS */
527 #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */
529 static int link_mem_sections(int nid) { return 0; }
530 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
532 #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
533 !defined(CONFIG_HUGETLBFS)
534 static inline int node_memory_callback(struct notifier_block *self,
535 unsigned long action, void *arg)
540 static void init_node_hugetlb_work(int nid) { }
544 int register_one_node(int nid)
549 if (node_online(nid)) {
550 int p_node = parent_node(nid);
551 struct node *parent = NULL;
554 parent = &node_devices[p_node];
556 error = register_node(&node_devices[nid], nid, parent);
558 /* link cpu under this node */
559 for_each_present_cpu(cpu) {
560 if (cpu_to_node(cpu) == nid)
561 register_cpu_under_node(cpu, nid);
564 /* link memory sections under this node */
565 error = link_mem_sections(nid);
567 /* initialize work queue for memory hot plug */
568 init_node_hugetlb_work(nid);
575 void unregister_one_node(int nid)
577 unregister_node(&node_devices[nid]);
581 * node states attributes
584 static ssize_t print_nodes_state(enum node_states state, char *buf)
588 n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
589 if (n > 0 && PAGE_SIZE > n + 1) {
597 struct sysdev_class_attribute attr;
598 enum node_states state;
601 static ssize_t show_node_state(struct sysdev_class *class,
602 struct sysdev_class_attribute *attr, char *buf)
604 struct node_attr *na = container_of(attr, struct node_attr, attr);
605 return print_nodes_state(na->state, buf);
608 #define _NODE_ATTR(name, state) \
609 { _SYSDEV_CLASS_ATTR(name, 0444, show_node_state, NULL), state }
611 static struct node_attr node_state_attr[] = {
612 _NODE_ATTR(possible, N_POSSIBLE),
613 _NODE_ATTR(online, N_ONLINE),
614 _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
615 _NODE_ATTR(has_cpu, N_CPU),
616 #ifdef CONFIG_HIGHMEM
617 _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
621 static struct sysdev_class_attribute *node_state_attrs[] = {
622 &node_state_attr[0].attr,
623 &node_state_attr[1].attr,
624 &node_state_attr[2].attr,
625 &node_state_attr[3].attr,
626 #ifdef CONFIG_HIGHMEM
627 &node_state_attr[4].attr,
632 #define NODE_CALLBACK_PRI 2 /* lower than SLAB */
633 static int __init register_node_type(void)
637 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
638 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
640 ret = sysdev_class_register(&node_class);
642 hotplug_memory_notifier(node_memory_callback,
647 * Note: we're not going to unregister the node class if we fail
648 * to register the node state class attribute files.
652 postcore_initcall(register_node_type);