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 21 static struct sysdev_class_attribute *node_state_attrs[]; 22 23 static struct sysdev_class node_class = { 24 .name = "node", 25 .attrs = node_state_attrs, 26 }; 27 28 29 static 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 46 static 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 } 51 static 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 57 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); 58 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL); 59 60 #define K(x) ((x) << (PAGE_SHIFT - 10)) 61 static 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 157 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); 158 159 static 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 } 176 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); 177 178 static 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 } 188 static SYSDEV_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL); 189 190 static 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 } 209 static 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 */ 221 static node_registration_func_t __hugetlb_register_node; 222 static node_registration_func_t __hugetlb_unregister_node; 223 224 static 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 } 233 234 static inline void hugetlb_unregister_node(struct node *node) 235 { 236 if (__hugetlb_unregister_node) 237 __hugetlb_unregister_node(node); 238 } 239 240 void 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 247 static inline void hugetlb_register_node(struct node *node) {} 248 249 static 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 */ 259 int 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 */ 291 void 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 } 305 306 struct node node_devices[MAX_NUMNODES]; 307 308 /* 309 * register cpu under node 310 */ 311 int 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 } 333 334 int 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) 355 356 static 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 */ 369 int 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 */ 405 int 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 } 439 440 static 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 */ 474 static 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 } 489 490 static void init_node_hugetlb_work(int nid) 491 { 492 INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work); 493 } 494 495 static 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 */ 524 525 static 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) 530 static inline int node_memory_callback(struct notifier_block *self, 531 unsigned long action, void *arg) 532 { 533 return NOTIFY_OK; 534 } 535 536 static void init_node_hugetlb_work(int nid) { } 537 538 #endif 539 540 int 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 } 570 571 void unregister_one_node(int nid) 572 { 573 unregister_node(&node_devices[nid]); 574 } 575 576 /* 577 * node states attributes 578 */ 579 580 static 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 } 591 592 struct node_attr { 593 struct sysdev_class_attribute attr; 594 enum node_states state; 595 }; 596 597 static 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 } 606 607 static 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 }; 616 617 static 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 */ 629 static 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 } 648 postcore_initcall(register_node_type); 649