1 /* 2 * Basic Node interface support 3 */ 4 5 #include <linux/module.h> 6 #include <linux/init.h> 7 #include <linux/mm.h> 8 #include <linux/memory.h> 9 #include <linux/vmstat.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 bus_type node_subsys = { 22 .name = "node", 23 .dev_name = "node", 24 }; 25 26 27 static ssize_t node_read_cpumap(struct device *dev, int type, char *buf) 28 { 29 struct node *node_dev = to_node(dev); 30 const struct cpumask *mask = cpumask_of_node(node_dev->dev.id); 31 int len; 32 33 /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */ 34 BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1)); 35 36 len = type? 37 cpulist_scnprintf(buf, PAGE_SIZE-2, mask) : 38 cpumask_scnprintf(buf, PAGE_SIZE-2, mask); 39 buf[len++] = '\n'; 40 buf[len] = '\0'; 41 return len; 42 } 43 44 static inline ssize_t node_read_cpumask(struct device *dev, 45 struct device_attribute *attr, char *buf) 46 { 47 return node_read_cpumap(dev, 0, buf); 48 } 49 static inline ssize_t node_read_cpulist(struct device *dev, 50 struct device_attribute *attr, char *buf) 51 { 52 return node_read_cpumap(dev, 1, buf); 53 } 54 55 static DEVICE_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); 56 static DEVICE_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL); 57 58 #define K(x) ((x) << (PAGE_SHIFT - 10)) 59 static ssize_t node_read_meminfo(struct device *dev, 60 struct device_attribute *attr, char *buf) 61 { 62 int n; 63 int nid = dev->id; 64 struct sysinfo i; 65 66 si_meminfo_node(&i, nid); 67 n = sprintf(buf, 68 "Node %d MemTotal: %8lu kB\n" 69 "Node %d MemFree: %8lu kB\n" 70 "Node %d MemUsed: %8lu kB\n" 71 "Node %d Active: %8lu kB\n" 72 "Node %d Inactive: %8lu kB\n" 73 "Node %d Active(anon): %8lu kB\n" 74 "Node %d Inactive(anon): %8lu kB\n" 75 "Node %d Active(file): %8lu kB\n" 76 "Node %d Inactive(file): %8lu kB\n" 77 "Node %d Unevictable: %8lu kB\n" 78 "Node %d Mlocked: %8lu kB\n", 79 nid, K(i.totalram), 80 nid, K(i.freeram), 81 nid, K(i.totalram - i.freeram), 82 nid, K(node_page_state(nid, NR_ACTIVE_ANON) + 83 node_page_state(nid, NR_ACTIVE_FILE)), 84 nid, K(node_page_state(nid, NR_INACTIVE_ANON) + 85 node_page_state(nid, NR_INACTIVE_FILE)), 86 nid, K(node_page_state(nid, NR_ACTIVE_ANON)), 87 nid, K(node_page_state(nid, NR_INACTIVE_ANON)), 88 nid, K(node_page_state(nid, NR_ACTIVE_FILE)), 89 nid, K(node_page_state(nid, NR_INACTIVE_FILE)), 90 nid, K(node_page_state(nid, NR_UNEVICTABLE)), 91 nid, K(node_page_state(nid, NR_MLOCK))); 92 93 #ifdef CONFIG_HIGHMEM 94 n += sprintf(buf + n, 95 "Node %d HighTotal: %8lu kB\n" 96 "Node %d HighFree: %8lu kB\n" 97 "Node %d LowTotal: %8lu kB\n" 98 "Node %d LowFree: %8lu kB\n", 99 nid, K(i.totalhigh), 100 nid, K(i.freehigh), 101 nid, K(i.totalram - i.totalhigh), 102 nid, K(i.freeram - i.freehigh)); 103 #endif 104 n += sprintf(buf + n, 105 "Node %d Dirty: %8lu kB\n" 106 "Node %d Writeback: %8lu kB\n" 107 "Node %d FilePages: %8lu kB\n" 108 "Node %d Mapped: %8lu kB\n" 109 "Node %d AnonPages: %8lu kB\n" 110 "Node %d Shmem: %8lu kB\n" 111 "Node %d KernelStack: %8lu kB\n" 112 "Node %d PageTables: %8lu kB\n" 113 "Node %d NFS_Unstable: %8lu kB\n" 114 "Node %d Bounce: %8lu kB\n" 115 "Node %d WritebackTmp: %8lu kB\n" 116 "Node %d Slab: %8lu kB\n" 117 "Node %d SReclaimable: %8lu kB\n" 118 "Node %d SUnreclaim: %8lu kB\n" 119 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 120 "Node %d AnonHugePages: %8lu kB\n" 121 #endif 122 , 123 nid, K(node_page_state(nid, NR_FILE_DIRTY)), 124 nid, K(node_page_state(nid, NR_WRITEBACK)), 125 nid, K(node_page_state(nid, NR_FILE_PAGES)), 126 nid, K(node_page_state(nid, NR_FILE_MAPPED)), 127 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 128 nid, K(node_page_state(nid, NR_ANON_PAGES) 129 + node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) * 130 HPAGE_PMD_NR), 131 #else 132 nid, K(node_page_state(nid, NR_ANON_PAGES)), 133 #endif 134 nid, K(node_page_state(nid, NR_SHMEM)), 135 nid, node_page_state(nid, NR_KERNEL_STACK) * 136 THREAD_SIZE / 1024, 137 nid, K(node_page_state(nid, NR_PAGETABLE)), 138 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), 139 nid, K(node_page_state(nid, NR_BOUNCE)), 140 nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)), 141 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) + 142 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), 143 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)), 144 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 145 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)) 146 , nid, 147 K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) * 148 HPAGE_PMD_NR)); 149 #else 150 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); 151 #endif 152 n += hugetlb_report_node_meminfo(nid, buf + n); 153 return n; 154 } 155 156 #undef K 157 static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); 158 159 static ssize_t node_read_numastat(struct device *dev, 160 struct device_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 DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); 177 178 static ssize_t node_read_vmstat(struct device *dev, 179 struct device_attribute *attr, char *buf) 180 { 181 int nid = dev->id; 182 int i; 183 int n = 0; 184 185 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) 186 n += sprintf(buf+n, "%s %lu\n", vmstat_text[i], 187 node_page_state(nid, i)); 188 189 return n; 190 } 191 static DEVICE_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL); 192 193 static ssize_t node_read_distance(struct device *dev, 194 struct device_attribute *attr, char * buf) 195 { 196 int nid = dev->id; 197 int len = 0; 198 int i; 199 200 /* 201 * buf is currently PAGE_SIZE in length and each node needs 4 chars 202 * at the most (distance + space or newline). 203 */ 204 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE); 205 206 for_each_online_node(i) 207 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); 208 209 len += sprintf(buf + len, "\n"); 210 return len; 211 } 212 static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL); 213 214 #ifdef CONFIG_HUGETLBFS 215 /* 216 * hugetlbfs per node attributes registration interface: 217 * When/if hugetlb[fs] subsystem initializes [sometime after this module], 218 * it will register its per node attributes for all online nodes with 219 * memory. It will also call register_hugetlbfs_with_node(), below, to 220 * register its attribute registration functions with this node driver. 221 * Once these hooks have been initialized, the node driver will call into 222 * the hugetlb module to [un]register attributes for hot-plugged nodes. 223 */ 224 static node_registration_func_t __hugetlb_register_node; 225 static node_registration_func_t __hugetlb_unregister_node; 226 227 static inline bool hugetlb_register_node(struct node *node) 228 { 229 if (__hugetlb_register_node && 230 node_state(node->dev.id, N_HIGH_MEMORY)) { 231 __hugetlb_register_node(node); 232 return true; 233 } 234 return false; 235 } 236 237 static inline void hugetlb_unregister_node(struct node *node) 238 { 239 if (__hugetlb_unregister_node) 240 __hugetlb_unregister_node(node); 241 } 242 243 void register_hugetlbfs_with_node(node_registration_func_t doregister, 244 node_registration_func_t unregister) 245 { 246 __hugetlb_register_node = doregister; 247 __hugetlb_unregister_node = unregister; 248 } 249 #else 250 static inline void hugetlb_register_node(struct node *node) {} 251 252 static inline void hugetlb_unregister_node(struct node *node) {} 253 #endif 254 255 256 /* 257 * register_node - Setup a sysfs device for a node. 258 * @num - Node number to use when creating the device. 259 * 260 * Initialize and register the node device. 261 */ 262 int register_node(struct node *node, int num, struct node *parent) 263 { 264 int error; 265 266 node->dev.id = num; 267 node->dev.bus = &node_subsys; 268 error = device_register(&node->dev); 269 270 if (!error){ 271 device_create_file(&node->dev, &dev_attr_cpumap); 272 device_create_file(&node->dev, &dev_attr_cpulist); 273 device_create_file(&node->dev, &dev_attr_meminfo); 274 device_create_file(&node->dev, &dev_attr_numastat); 275 device_create_file(&node->dev, &dev_attr_distance); 276 device_create_file(&node->dev, &dev_attr_vmstat); 277 278 scan_unevictable_register_node(node); 279 280 hugetlb_register_node(node); 281 282 compaction_register_node(node); 283 } 284 return error; 285 } 286 287 /** 288 * unregister_node - unregister a node device 289 * @node: node going away 290 * 291 * Unregisters a node device @node. All the devices on the node must be 292 * unregistered before calling this function. 293 */ 294 void unregister_node(struct node *node) 295 { 296 device_remove_file(&node->dev, &dev_attr_cpumap); 297 device_remove_file(&node->dev, &dev_attr_cpulist); 298 device_remove_file(&node->dev, &dev_attr_meminfo); 299 device_remove_file(&node->dev, &dev_attr_numastat); 300 device_remove_file(&node->dev, &dev_attr_distance); 301 device_remove_file(&node->dev, &dev_attr_vmstat); 302 303 scan_unevictable_unregister_node(node); 304 hugetlb_unregister_node(node); /* no-op, if memoryless node */ 305 306 device_unregister(&node->dev); 307 } 308 309 struct node node_devices[MAX_NUMNODES]; 310 311 /* 312 * register cpu under node 313 */ 314 int register_cpu_under_node(unsigned int cpu, unsigned int nid) 315 { 316 int ret; 317 struct device *obj; 318 319 if (!node_online(nid)) 320 return 0; 321 322 obj = get_cpu_device(cpu); 323 if (!obj) 324 return 0; 325 326 ret = sysfs_create_link(&node_devices[nid].dev.kobj, 327 &obj->kobj, 328 kobject_name(&obj->kobj)); 329 if (ret) 330 return ret; 331 332 return sysfs_create_link(&obj->kobj, 333 &node_devices[nid].dev.kobj, 334 kobject_name(&node_devices[nid].dev.kobj)); 335 } 336 337 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) 338 { 339 struct device *obj; 340 341 if (!node_online(nid)) 342 return 0; 343 344 obj = get_cpu_device(cpu); 345 if (!obj) 346 return 0; 347 348 sysfs_remove_link(&node_devices[nid].dev.kobj, 349 kobject_name(&obj->kobj)); 350 sysfs_remove_link(&obj->kobj, 351 kobject_name(&node_devices[nid].dev.kobj)); 352 353 return 0; 354 } 355 356 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 357 #define page_initialized(page) (page->lru.next) 358 359 static int get_nid_for_pfn(unsigned long pfn) 360 { 361 struct page *page; 362 363 if (!pfn_valid_within(pfn)) 364 return -1; 365 page = pfn_to_page(pfn); 366 if (!page_initialized(page)) 367 return -1; 368 return pfn_to_nid(pfn); 369 } 370 371 /* register memory section under specified node if it spans that node */ 372 int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) 373 { 374 int ret; 375 unsigned long pfn, sect_start_pfn, sect_end_pfn; 376 377 if (!mem_blk) 378 return -EFAULT; 379 if (!node_online(nid)) 380 return 0; 381 382 sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr); 383 sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr); 384 sect_end_pfn += PAGES_PER_SECTION - 1; 385 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { 386 int page_nid; 387 388 page_nid = get_nid_for_pfn(pfn); 389 if (page_nid < 0) 390 continue; 391 if (page_nid != nid) 392 continue; 393 ret = sysfs_create_link_nowarn(&node_devices[nid].dev.kobj, 394 &mem_blk->dev.kobj, 395 kobject_name(&mem_blk->dev.kobj)); 396 if (ret) 397 return ret; 398 399 return sysfs_create_link_nowarn(&mem_blk->dev.kobj, 400 &node_devices[nid].dev.kobj, 401 kobject_name(&node_devices[nid].dev.kobj)); 402 } 403 /* mem section does not span the specified node */ 404 return 0; 405 } 406 407 /* unregister memory section under all nodes that it spans */ 408 int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, 409 unsigned long phys_index) 410 { 411 NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); 412 unsigned long pfn, sect_start_pfn, sect_end_pfn; 413 414 if (!mem_blk) { 415 NODEMASK_FREE(unlinked_nodes); 416 return -EFAULT; 417 } 418 if (!unlinked_nodes) 419 return -ENOMEM; 420 nodes_clear(*unlinked_nodes); 421 422 sect_start_pfn = section_nr_to_pfn(phys_index); 423 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; 424 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { 425 int nid; 426 427 nid = get_nid_for_pfn(pfn); 428 if (nid < 0) 429 continue; 430 if (!node_online(nid)) 431 continue; 432 if (node_test_and_set(nid, *unlinked_nodes)) 433 continue; 434 sysfs_remove_link(&node_devices[nid].dev.kobj, 435 kobject_name(&mem_blk->dev.kobj)); 436 sysfs_remove_link(&mem_blk->dev.kobj, 437 kobject_name(&node_devices[nid].dev.kobj)); 438 } 439 NODEMASK_FREE(unlinked_nodes); 440 return 0; 441 } 442 443 static int link_mem_sections(int nid) 444 { 445 unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; 446 unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; 447 unsigned long pfn; 448 struct memory_block *mem_blk = NULL; 449 int err = 0; 450 451 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { 452 unsigned long section_nr = pfn_to_section_nr(pfn); 453 struct mem_section *mem_sect; 454 int ret; 455 456 if (!present_section_nr(section_nr)) 457 continue; 458 mem_sect = __nr_to_section(section_nr); 459 mem_blk = find_memory_block_hinted(mem_sect, mem_blk); 460 ret = register_mem_sect_under_node(mem_blk, nid); 461 if (!err) 462 err = ret; 463 464 /* discard ref obtained in find_memory_block() */ 465 } 466 467 if (mem_blk) 468 kobject_put(&mem_blk->dev.kobj); 469 return err; 470 } 471 472 #ifdef CONFIG_HUGETLBFS 473 /* 474 * Handle per node hstate attribute [un]registration on transistions 475 * to/from memoryless state. 476 */ 477 static void node_hugetlb_work(struct work_struct *work) 478 { 479 struct node *node = container_of(work, struct node, node_work); 480 481 /* 482 * We only get here when a node transitions to/from memoryless state. 483 * We can detect which transition occurred by examining whether the 484 * node has memory now. hugetlb_register_node() already check this 485 * so we try to register the attributes. If that fails, then the 486 * node has transitioned to memoryless, try to unregister the 487 * attributes. 488 */ 489 if (!hugetlb_register_node(node)) 490 hugetlb_unregister_node(node); 491 } 492 493 static void init_node_hugetlb_work(int nid) 494 { 495 INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work); 496 } 497 498 static int node_memory_callback(struct notifier_block *self, 499 unsigned long action, void *arg) 500 { 501 struct memory_notify *mnb = arg; 502 int nid = mnb->status_change_nid; 503 504 switch (action) { 505 case MEM_ONLINE: 506 case MEM_OFFLINE: 507 /* 508 * offload per node hstate [un]registration to a work thread 509 * when transitioning to/from memoryless state. 510 */ 511 if (nid != NUMA_NO_NODE) 512 schedule_work(&node_devices[nid].node_work); 513 break; 514 515 case MEM_GOING_ONLINE: 516 case MEM_GOING_OFFLINE: 517 case MEM_CANCEL_ONLINE: 518 case MEM_CANCEL_OFFLINE: 519 default: 520 break; 521 } 522 523 return NOTIFY_OK; 524 } 525 #endif /* CONFIG_HUGETLBFS */ 526 #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */ 527 528 static int link_mem_sections(int nid) { return 0; } 529 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 530 531 #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \ 532 !defined(CONFIG_HUGETLBFS) 533 static inline int node_memory_callback(struct notifier_block *self, 534 unsigned long action, void *arg) 535 { 536 return NOTIFY_OK; 537 } 538 539 static void init_node_hugetlb_work(int nid) { } 540 541 #endif 542 543 int register_one_node(int nid) 544 { 545 int error = 0; 546 int cpu; 547 548 if (node_online(nid)) { 549 int p_node = parent_node(nid); 550 struct node *parent = NULL; 551 552 if (p_node != nid) 553 parent = &node_devices[p_node]; 554 555 error = register_node(&node_devices[nid], nid, parent); 556 557 /* link cpu under this node */ 558 for_each_present_cpu(cpu) { 559 if (cpu_to_node(cpu) == nid) 560 register_cpu_under_node(cpu, nid); 561 } 562 563 /* link memory sections under this node */ 564 error = link_mem_sections(nid); 565 566 /* initialize work queue for memory hot plug */ 567 init_node_hugetlb_work(nid); 568 } 569 570 return error; 571 572 } 573 574 void unregister_one_node(int nid) 575 { 576 unregister_node(&node_devices[nid]); 577 } 578 579 /* 580 * node states attributes 581 */ 582 583 static ssize_t print_nodes_state(enum node_states state, char *buf) 584 { 585 int n; 586 587 n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]); 588 if (n > 0 && PAGE_SIZE > n + 1) { 589 *(buf + n++) = '\n'; 590 *(buf + n++) = '\0'; 591 } 592 return n; 593 } 594 595 struct node_attr { 596 struct device_attribute attr; 597 enum node_states state; 598 }; 599 600 static ssize_t show_node_state(struct device *dev, 601 struct device_attribute *attr, char *buf) 602 { 603 struct node_attr *na = container_of(attr, struct node_attr, attr); 604 return print_nodes_state(na->state, buf); 605 } 606 607 #define _NODE_ATTR(name, state) \ 608 { __ATTR(name, 0444, show_node_state, NULL), state } 609 610 static struct node_attr node_state_attr[] = { 611 _NODE_ATTR(possible, N_POSSIBLE), 612 _NODE_ATTR(online, N_ONLINE), 613 _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), 614 _NODE_ATTR(has_cpu, N_CPU), 615 #ifdef CONFIG_HIGHMEM 616 _NODE_ATTR(has_high_memory, N_HIGH_MEMORY), 617 #endif 618 }; 619 620 static struct attribute *node_state_attrs[] = { 621 &node_state_attr[0].attr.attr, 622 &node_state_attr[1].attr.attr, 623 &node_state_attr[2].attr.attr, 624 &node_state_attr[3].attr.attr, 625 #ifdef CONFIG_HIGHMEM 626 &node_state_attr[4].attr.attr, 627 #endif 628 NULL 629 }; 630 631 static struct attribute_group memory_root_attr_group = { 632 .attrs = node_state_attrs, 633 }; 634 635 static const struct attribute_group *cpu_root_attr_groups[] = { 636 &memory_root_attr_group, 637 NULL, 638 }; 639 640 #define NODE_CALLBACK_PRI 2 /* lower than SLAB */ 641 static int __init register_node_type(void) 642 { 643 int ret; 644 645 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); 646 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); 647 648 ret = subsys_system_register(&node_subsys, cpu_root_attr_groups); 649 if (!ret) { 650 hotplug_memory_notifier(node_memory_callback, 651 NODE_CALLBACK_PRI); 652 } 653 654 /* 655 * Note: we're not going to unregister the node class if we fail 656 * to register the node state class attribute files. 657 */ 658 return ret; 659 } 660 postcore_initcall(register_node_type); 661