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/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> 21 22 static struct sysdev_class_attribute *node_state_attrs[]; 23 24 static struct sysdev_class node_class = { 25 .name = "node", 26 .attrs = node_state_attrs, 27 }; 28 29 30 static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf) 31 { 32 struct node *node_dev = to_node(dev); 33 const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id); 34 int len; 35 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)); 38 39 len = type? 40 cpulist_scnprintf(buf, PAGE_SIZE-2, mask) : 41 cpumask_scnprintf(buf, PAGE_SIZE-2, mask); 42 buf[len++] = '\n'; 43 buf[len] = '\0'; 44 return len; 45 } 46 47 static inline ssize_t node_read_cpumask(struct sys_device *dev, 48 struct sysdev_attribute *attr, char *buf) 49 { 50 return node_read_cpumap(dev, 0, buf); 51 } 52 static inline ssize_t node_read_cpulist(struct sys_device *dev, 53 struct sysdev_attribute *attr, char *buf) 54 { 55 return node_read_cpumap(dev, 1, buf); 56 } 57 58 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); 59 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL); 60 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) 64 { 65 int n; 66 int nid = dev->id; 67 struct sysinfo i; 68 69 si_meminfo_node(&i, nid); 70 n = sprintf(buf, 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", 82 nid, K(i.totalram), 83 nid, K(i.freeram), 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))); 95 96 #ifdef CONFIG_HIGHMEM 97 n += sprintf(buf + n, 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", 102 nid, K(i.totalhigh), 103 nid, K(i.freehigh), 104 nid, K(i.totalram - i.totalhigh), 105 nid, K(i.freeram - i.freehigh)); 106 #endif 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" 124 #endif 125 , 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) * 133 HPAGE_PMD_NR 134 #endif 135 ), 136 nid, K(node_page_state(nid, NR_SHMEM)), 137 nid, node_page_state(nid, NR_KERNEL_STACK) * 138 THREAD_SIZE / 1024, 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 148 , nid, 149 K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) * 150 HPAGE_PMD_NR) 151 #endif 152 ); 153 n += hugetlb_report_node_meminfo(nid, buf + n); 154 return n; 155 } 156 157 #undef K 158 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); 159 160 static ssize_t node_read_numastat(struct sys_device * dev, 161 struct sysdev_attribute *attr, char * buf) 162 { 163 return sprintf(buf, 164 "numa_hit %lu\n" 165 "numa_miss %lu\n" 166 "numa_foreign %lu\n" 167 "interleave_hit %lu\n" 168 "local_node %lu\n" 169 "other_node %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)); 176 } 177 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); 178 179 static ssize_t node_read_vmstat(struct sys_device *dev, 180 struct sysdev_attribute *attr, char *buf) 181 { 182 int nid = dev->id; 183 int i; 184 int n = 0; 185 186 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)); 189 190 return n; 191 } 192 static SYSDEV_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL); 193 194 static ssize_t node_read_distance(struct sys_device * dev, 195 struct sysdev_attribute *attr, char * buf) 196 { 197 int nid = dev->id; 198 int len = 0; 199 int i; 200 201 /* 202 * buf is currently PAGE_SIZE in length and each node needs 4 chars 203 * at the most (distance + space or newline). 204 */ 205 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE); 206 207 for_each_online_node(i) 208 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); 209 210 len += sprintf(buf + len, "\n"); 211 return len; 212 } 213 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL); 214 215 #ifdef CONFIG_HUGETLBFS 216 /* 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. 224 */ 225 static node_registration_func_t __hugetlb_register_node; 226 static node_registration_func_t __hugetlb_unregister_node; 227 228 static inline bool hugetlb_register_node(struct node *node) 229 { 230 if (__hugetlb_register_node && 231 node_state(node->sysdev.id, N_HIGH_MEMORY)) { 232 __hugetlb_register_node(node); 233 return true; 234 } 235 return false; 236 } 237 238 static inline void hugetlb_unregister_node(struct node *node) 239 { 240 if (__hugetlb_unregister_node) 241 __hugetlb_unregister_node(node); 242 } 243 244 void register_hugetlbfs_with_node(node_registration_func_t doregister, 245 node_registration_func_t unregister) 246 { 247 __hugetlb_register_node = doregister; 248 __hugetlb_unregister_node = unregister; 249 } 250 #else 251 static inline void hugetlb_register_node(struct node *node) {} 252 253 static inline void hugetlb_unregister_node(struct node *node) {} 254 #endif 255 256 257 /* 258 * register_node - Setup a sysfs device for a node. 259 * @num - Node number to use when creating the device. 260 * 261 * Initialize and register the node device. 262 */ 263 int register_node(struct node *node, int num, struct node *parent) 264 { 265 int error; 266 267 node->sysdev.id = num; 268 node->sysdev.cls = &node_class; 269 error = sysdev_register(&node->sysdev); 270 271 if (!error){ 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); 278 279 scan_unevictable_register_node(node); 280 281 hugetlb_register_node(node); 282 283 compaction_register_node(node); 284 } 285 return error; 286 } 287 288 /** 289 * unregister_node - unregister a node device 290 * @node: node going away 291 * 292 * Unregisters a node device @node. All the devices on the node must be 293 * unregistered before calling this function. 294 */ 295 void unregister_node(struct node *node) 296 { 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); 303 304 scan_unevictable_unregister_node(node); 305 hugetlb_unregister_node(node); /* no-op, if memoryless node */ 306 307 sysdev_unregister(&node->sysdev); 308 } 309 310 struct node node_devices[MAX_NUMNODES]; 311 312 /* 313 * register cpu under node 314 */ 315 int register_cpu_under_node(unsigned int cpu, unsigned int nid) 316 { 317 int ret; 318 struct sys_device *obj; 319 320 if (!node_online(nid)) 321 return 0; 322 323 obj = get_cpu_sysdev(cpu); 324 if (!obj) 325 return 0; 326 327 ret = sysfs_create_link(&node_devices[nid].sysdev.kobj, 328 &obj->kobj, 329 kobject_name(&obj->kobj)); 330 if (ret) 331 return ret; 332 333 return sysfs_create_link(&obj->kobj, 334 &node_devices[nid].sysdev.kobj, 335 kobject_name(&node_devices[nid].sysdev.kobj)); 336 } 337 338 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) 339 { 340 struct sys_device *obj; 341 342 if (!node_online(nid)) 343 return 0; 344 345 obj = get_cpu_sysdev(cpu); 346 if (!obj) 347 return 0; 348 349 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)); 353 354 return 0; 355 } 356 357 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 358 #define page_initialized(page) (page->lru.next) 359 360 static int get_nid_for_pfn(unsigned long pfn) 361 { 362 struct page *page; 363 364 if (!pfn_valid_within(pfn)) 365 return -1; 366 page = pfn_to_page(pfn); 367 if (!page_initialized(page)) 368 return -1; 369 return pfn_to_nid(pfn); 370 } 371 372 /* 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) 374 { 375 int ret; 376 unsigned long pfn, sect_start_pfn, sect_end_pfn; 377 378 if (!mem_blk) 379 return -EFAULT; 380 if (!node_online(nid)) 381 return 0; 382 383 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++) { 387 int page_nid; 388 389 page_nid = get_nid_for_pfn(pfn); 390 if (page_nid < 0) 391 continue; 392 if (page_nid != nid) 393 continue; 394 ret = sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj, 395 &mem_blk->sysdev.kobj, 396 kobject_name(&mem_blk->sysdev.kobj)); 397 if (ret) 398 return ret; 399 400 return sysfs_create_link_nowarn(&mem_blk->sysdev.kobj, 401 &node_devices[nid].sysdev.kobj, 402 kobject_name(&node_devices[nid].sysdev.kobj)); 403 } 404 /* mem section does not span the specified node */ 405 return 0; 406 } 407 408 /* 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) 411 { 412 NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); 413 unsigned long pfn, sect_start_pfn, sect_end_pfn; 414 415 if (!mem_blk) { 416 NODEMASK_FREE(unlinked_nodes); 417 return -EFAULT; 418 } 419 if (!unlinked_nodes) 420 return -ENOMEM; 421 nodes_clear(*unlinked_nodes); 422 423 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++) { 426 int nid; 427 428 nid = get_nid_for_pfn(pfn); 429 if (nid < 0) 430 continue; 431 if (!node_online(nid)) 432 continue; 433 if (node_test_and_set(nid, *unlinked_nodes)) 434 continue; 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)); 439 } 440 NODEMASK_FREE(unlinked_nodes); 441 return 0; 442 } 443 444 static int link_mem_sections(int nid) 445 { 446 unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; 447 unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; 448 unsigned long pfn; 449 struct memory_block *mem_blk = NULL; 450 int err = 0; 451 452 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; 455 int ret; 456 457 if (!present_section_nr(section_nr)) 458 continue; 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); 462 if (!err) 463 err = ret; 464 465 /* discard ref obtained in find_memory_block() */ 466 } 467 468 if (mem_blk) 469 kobject_put(&mem_blk->sysdev.kobj); 470 return err; 471 } 472 473 #ifdef CONFIG_HUGETLBFS 474 /* 475 * Handle per node hstate attribute [un]registration on transistions 476 * to/from memoryless state. 477 */ 478 static void node_hugetlb_work(struct work_struct *work) 479 { 480 struct node *node = container_of(work, struct node, node_work); 481 482 /* 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 488 * attributes. 489 */ 490 if (!hugetlb_register_node(node)) 491 hugetlb_unregister_node(node); 492 } 493 494 static void init_node_hugetlb_work(int nid) 495 { 496 INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work); 497 } 498 499 static int node_memory_callback(struct notifier_block *self, 500 unsigned long action, void *arg) 501 { 502 struct memory_notify *mnb = arg; 503 int nid = mnb->status_change_nid; 504 505 switch (action) { 506 case MEM_ONLINE: 507 case MEM_OFFLINE: 508 /* 509 * offload per node hstate [un]registration to a work thread 510 * when transitioning to/from memoryless state. 511 */ 512 if (nid != NUMA_NO_NODE) 513 schedule_work(&node_devices[nid].node_work); 514 break; 515 516 case MEM_GOING_ONLINE: 517 case MEM_GOING_OFFLINE: 518 case MEM_CANCEL_ONLINE: 519 case MEM_CANCEL_OFFLINE: 520 default: 521 break; 522 } 523 524 return NOTIFY_OK; 525 } 526 #endif /* CONFIG_HUGETLBFS */ 527 #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */ 528 529 static int link_mem_sections(int nid) { return 0; } 530 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 531 532 #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) 536 { 537 return NOTIFY_OK; 538 } 539 540 static void init_node_hugetlb_work(int nid) { } 541 542 #endif 543 544 int register_one_node(int nid) 545 { 546 int error = 0; 547 int cpu; 548 549 if (node_online(nid)) { 550 int p_node = parent_node(nid); 551 struct node *parent = NULL; 552 553 if (p_node != nid) 554 parent = &node_devices[p_node]; 555 556 error = register_node(&node_devices[nid], nid, parent); 557 558 /* 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); 562 } 563 564 /* link memory sections under this node */ 565 error = link_mem_sections(nid); 566 567 /* initialize work queue for memory hot plug */ 568 init_node_hugetlb_work(nid); 569 } 570 571 return error; 572 573 } 574 575 void unregister_one_node(int nid) 576 { 577 unregister_node(&node_devices[nid]); 578 } 579 580 /* 581 * node states attributes 582 */ 583 584 static ssize_t print_nodes_state(enum node_states state, char *buf) 585 { 586 int n; 587 588 n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]); 589 if (n > 0 && PAGE_SIZE > n + 1) { 590 *(buf + n++) = '\n'; 591 *(buf + n++) = '\0'; 592 } 593 return n; 594 } 595 596 struct node_attr { 597 struct sysdev_class_attribute attr; 598 enum node_states state; 599 }; 600 601 static ssize_t show_node_state(struct sysdev_class *class, 602 struct sysdev_class_attribute *attr, char *buf) 603 { 604 struct node_attr *na = container_of(attr, struct node_attr, attr); 605 return print_nodes_state(na->state, buf); 606 } 607 608 #define _NODE_ATTR(name, state) \ 609 { _SYSDEV_CLASS_ATTR(name, 0444, show_node_state, NULL), state } 610 611 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), 618 #endif 619 }; 620 621 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, 628 #endif 629 NULL 630 }; 631 632 #define NODE_CALLBACK_PRI 2 /* lower than SLAB */ 633 static int __init register_node_type(void) 634 { 635 int ret; 636 637 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); 638 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); 639 640 ret = sysdev_class_register(&node_class); 641 if (!ret) { 642 hotplug_memory_notifier(node_memory_callback, 643 NODE_CALLBACK_PRI); 644 } 645 646 /* 647 * Note: we're not going to unregister the node class if we fail 648 * to register the node state class attribute files. 649 */ 650 return ret; 651 } 652 postcore_initcall(register_node_type); 653