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/node.h>
11 #include <linux/hugetlb.h>
12 #include <linux/cpumask.h>
13 #include <linux/topology.h>
14 #include <linux/nodemask.h>
15 #include <linux/cpu.h>
16 #include <linux/device.h>
17 #include <linux/swap.h>
18 #include <linux/slab.h>
20 static struct sysdev_class_attribute
*node_state_attrs
[];
22 static struct sysdev_class node_class
= {
24 .attrs
= node_state_attrs
,
28 static ssize_t
node_read_cpumap(struct sys_device
*dev
, int type
, char *buf
)
30 struct node
*node_dev
= to_node(dev
);
31 const struct cpumask
*mask
= cpumask_of_node(node_dev
->sysdev
.id
);
34 /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
35 BUILD_BUG_ON((NR_CPUS
/32 * 9) > (PAGE_SIZE
-1));
38 cpulist_scnprintf(buf
, PAGE_SIZE
-2, mask
) :
39 cpumask_scnprintf(buf
, PAGE_SIZE
-2, mask
);
45 static inline ssize_t
node_read_cpumask(struct sys_device
*dev
,
46 struct sysdev_attribute
*attr
, char *buf
)
48 return node_read_cpumap(dev
, 0, buf
);
50 static inline ssize_t
node_read_cpulist(struct sys_device
*dev
,
51 struct sysdev_attribute
*attr
, char *buf
)
53 return node_read_cpumap(dev
, 1, buf
);
56 static SYSDEV_ATTR(cpumap
, S_IRUGO
, node_read_cpumask
, NULL
);
57 static SYSDEV_ATTR(cpulist
, S_IRUGO
, node_read_cpulist
, NULL
);
59 #define K(x) ((x) << (PAGE_SHIFT - 10))
60 static ssize_t
node_read_meminfo(struct sys_device
* dev
,
61 struct sysdev_attribute
*attr
, char * buf
)
67 si_meminfo_node(&i
, nid
);
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"
82 "Node %d HighTotal: %8lu kB\n"
83 "Node %d HighFree: %8lu kB\n"
84 "Node %d LowTotal: %8lu kB\n"
85 "Node %d LowFree: %8lu kB\n"
87 "Node %d Dirty: %8lu kB\n"
88 "Node %d Writeback: %8lu kB\n"
89 "Node %d FilePages: %8lu kB\n"
90 "Node %d Mapped: %8lu kB\n"
91 "Node %d AnonPages: %8lu kB\n"
92 "Node %d Shmem: %8lu kB\n"
93 "Node %d KernelStack: %8lu kB\n"
94 "Node %d PageTables: %8lu kB\n"
95 "Node %d NFS_Unstable: %8lu kB\n"
96 "Node %d Bounce: %8lu kB\n"
97 "Node %d WritebackTmp: %8lu kB\n"
98 "Node %d Slab: %8lu kB\n"
99 "Node %d SReclaimable: %8lu kB\n"
100 "Node %d SUnreclaim: %8lu kB\n",
103 nid
, K(i
.totalram
- i
.freeram
),
104 nid
, K(node_page_state(nid
, NR_ACTIVE_ANON
) +
105 node_page_state(nid
, NR_ACTIVE_FILE
)),
106 nid
, K(node_page_state(nid
, NR_INACTIVE_ANON
) +
107 node_page_state(nid
, NR_INACTIVE_FILE
)),
108 nid
, K(node_page_state(nid
, NR_ACTIVE_ANON
)),
109 nid
, K(node_page_state(nid
, NR_INACTIVE_ANON
)),
110 nid
, K(node_page_state(nid
, NR_ACTIVE_FILE
)),
111 nid
, K(node_page_state(nid
, NR_INACTIVE_FILE
)),
112 nid
, K(node_page_state(nid
, NR_UNEVICTABLE
)),
113 nid
, K(node_page_state(nid
, NR_MLOCK
)),
114 #ifdef CONFIG_HIGHMEM
117 nid
, K(i
.totalram
- i
.totalhigh
),
118 nid
, K(i
.freeram
- i
.freehigh
),
120 nid
, K(node_page_state(nid
, NR_FILE_DIRTY
)),
121 nid
, K(node_page_state(nid
, NR_WRITEBACK
)),
122 nid
, K(node_page_state(nid
, NR_FILE_PAGES
)),
123 nid
, K(node_page_state(nid
, NR_FILE_MAPPED
)),
124 nid
, K(node_page_state(nid
, NR_ANON_PAGES
)),
125 nid
, K(node_page_state(nid
, NR_SHMEM
)),
126 nid
, node_page_state(nid
, NR_KERNEL_STACK
) *
128 nid
, K(node_page_state(nid
, NR_PAGETABLE
)),
129 nid
, K(node_page_state(nid
, NR_UNSTABLE_NFS
)),
130 nid
, K(node_page_state(nid
, NR_BOUNCE
)),
131 nid
, K(node_page_state(nid
, NR_WRITEBACK_TEMP
)),
132 nid
, K(node_page_state(nid
, NR_SLAB_RECLAIMABLE
) +
133 node_page_state(nid
, NR_SLAB_UNRECLAIMABLE
)),
134 nid
, K(node_page_state(nid
, NR_SLAB_RECLAIMABLE
)),
135 nid
, K(node_page_state(nid
, NR_SLAB_UNRECLAIMABLE
)));
136 n
+= hugetlb_report_node_meminfo(nid
, buf
+ n
);
141 static SYSDEV_ATTR(meminfo
, S_IRUGO
, node_read_meminfo
, NULL
);
143 static ssize_t
node_read_numastat(struct sys_device
* dev
,
144 struct sysdev_attribute
*attr
, char * buf
)
150 "interleave_hit %lu\n"
153 node_page_state(dev
->id
, NUMA_HIT
),
154 node_page_state(dev
->id
, NUMA_MISS
),
155 node_page_state(dev
->id
, NUMA_FOREIGN
),
156 node_page_state(dev
->id
, NUMA_INTERLEAVE_HIT
),
157 node_page_state(dev
->id
, NUMA_LOCAL
),
158 node_page_state(dev
->id
, NUMA_OTHER
));
160 static SYSDEV_ATTR(numastat
, S_IRUGO
, node_read_numastat
, NULL
);
162 static ssize_t
node_read_distance(struct sys_device
* dev
,
163 struct sysdev_attribute
*attr
, char * buf
)
170 * buf is currently PAGE_SIZE in length and each node needs 4 chars
171 * at the most (distance + space or newline).
173 BUILD_BUG_ON(MAX_NUMNODES
* 4 > PAGE_SIZE
);
175 for_each_online_node(i
)
176 len
+= sprintf(buf
+ len
, "%s%d", i
? " " : "", node_distance(nid
, i
));
178 len
+= sprintf(buf
+ len
, "\n");
181 static SYSDEV_ATTR(distance
, S_IRUGO
, node_read_distance
, NULL
);
183 #ifdef CONFIG_HUGETLBFS
185 * hugetlbfs per node attributes registration interface:
186 * When/if hugetlb[fs] subsystem initializes [sometime after this module],
187 * it will register its per node attributes for all online nodes with
188 * memory. It will also call register_hugetlbfs_with_node(), below, to
189 * register its attribute registration functions with this node driver.
190 * Once these hooks have been initialized, the node driver will call into
191 * the hugetlb module to [un]register attributes for hot-plugged nodes.
193 static node_registration_func_t __hugetlb_register_node
;
194 static node_registration_func_t __hugetlb_unregister_node
;
196 static inline bool hugetlb_register_node(struct node
*node
)
198 if (__hugetlb_register_node
&&
199 node_state(node
->sysdev
.id
, N_HIGH_MEMORY
)) {
200 __hugetlb_register_node(node
);
206 static inline void hugetlb_unregister_node(struct node
*node
)
208 if (__hugetlb_unregister_node
)
209 __hugetlb_unregister_node(node
);
212 void register_hugetlbfs_with_node(node_registration_func_t doregister
,
213 node_registration_func_t unregister
)
215 __hugetlb_register_node
= doregister
;
216 __hugetlb_unregister_node
= unregister
;
219 static inline void hugetlb_register_node(struct node
*node
) {}
221 static inline void hugetlb_unregister_node(struct node
*node
) {}
226 * register_node - Setup a sysfs device for a node.
227 * @num - Node number to use when creating the device.
229 * Initialize and register the node device.
231 int register_node(struct node
*node
, int num
, struct node
*parent
)
235 node
->sysdev
.id
= num
;
236 node
->sysdev
.cls
= &node_class
;
237 error
= sysdev_register(&node
->sysdev
);
240 sysdev_create_file(&node
->sysdev
, &attr_cpumap
);
241 sysdev_create_file(&node
->sysdev
, &attr_cpulist
);
242 sysdev_create_file(&node
->sysdev
, &attr_meminfo
);
243 sysdev_create_file(&node
->sysdev
, &attr_numastat
);
244 sysdev_create_file(&node
->sysdev
, &attr_distance
);
246 scan_unevictable_register_node(node
);
248 hugetlb_register_node(node
);
254 * unregister_node - unregister a node device
255 * @node: node going away
257 * Unregisters a node device @node. All the devices on the node must be
258 * unregistered before calling this function.
260 void unregister_node(struct node
*node
)
262 sysdev_remove_file(&node
->sysdev
, &attr_cpumap
);
263 sysdev_remove_file(&node
->sysdev
, &attr_cpulist
);
264 sysdev_remove_file(&node
->sysdev
, &attr_meminfo
);
265 sysdev_remove_file(&node
->sysdev
, &attr_numastat
);
266 sysdev_remove_file(&node
->sysdev
, &attr_distance
);
268 scan_unevictable_unregister_node(node
);
269 hugetlb_unregister_node(node
); /* no-op, if memoryless node */
271 sysdev_unregister(&node
->sysdev
);
274 struct node node_devices
[MAX_NUMNODES
];
277 * register cpu under node
279 int register_cpu_under_node(unsigned int cpu
, unsigned int nid
)
282 struct sys_device
*obj
;
284 if (!node_online(nid
))
287 obj
= get_cpu_sysdev(cpu
);
291 ret
= sysfs_create_link(&node_devices
[nid
].sysdev
.kobj
,
293 kobject_name(&obj
->kobj
));
297 return sysfs_create_link(&obj
->kobj
,
298 &node_devices
[nid
].sysdev
.kobj
,
299 kobject_name(&node_devices
[nid
].sysdev
.kobj
));
302 int unregister_cpu_under_node(unsigned int cpu
, unsigned int nid
)
304 struct sys_device
*obj
;
306 if (!node_online(nid
))
309 obj
= get_cpu_sysdev(cpu
);
313 sysfs_remove_link(&node_devices
[nid
].sysdev
.kobj
,
314 kobject_name(&obj
->kobj
));
315 sysfs_remove_link(&obj
->kobj
,
316 kobject_name(&node_devices
[nid
].sysdev
.kobj
));
321 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
322 #define page_initialized(page) (page->lru.next)
324 static int get_nid_for_pfn(unsigned long pfn
)
328 if (!pfn_valid_within(pfn
))
330 page
= pfn_to_page(pfn
);
331 if (!page_initialized(page
))
333 return pfn_to_nid(pfn
);
336 /* register memory section under specified node if it spans that node */
337 int register_mem_sect_under_node(struct memory_block
*mem_blk
, int nid
)
340 unsigned long pfn
, sect_start_pfn
, sect_end_pfn
;
344 if (!node_online(nid
))
346 sect_start_pfn
= section_nr_to_pfn(mem_blk
->phys_index
);
347 sect_end_pfn
= sect_start_pfn
+ PAGES_PER_SECTION
- 1;
348 for (pfn
= sect_start_pfn
; pfn
<= sect_end_pfn
; pfn
++) {
351 page_nid
= get_nid_for_pfn(pfn
);
356 ret
= sysfs_create_link_nowarn(&node_devices
[nid
].sysdev
.kobj
,
357 &mem_blk
->sysdev
.kobj
,
358 kobject_name(&mem_blk
->sysdev
.kobj
));
362 return sysfs_create_link_nowarn(&mem_blk
->sysdev
.kobj
,
363 &node_devices
[nid
].sysdev
.kobj
,
364 kobject_name(&node_devices
[nid
].sysdev
.kobj
));
366 /* mem section does not span the specified node */
370 /* unregister memory section under all nodes that it spans */
371 int unregister_mem_sect_under_nodes(struct memory_block
*mem_blk
)
373 NODEMASK_ALLOC(nodemask_t
, unlinked_nodes
, GFP_KERNEL
);
374 unsigned long pfn
, sect_start_pfn
, sect_end_pfn
;
377 NODEMASK_FREE(unlinked_nodes
);
382 nodes_clear(*unlinked_nodes
);
383 sect_start_pfn
= section_nr_to_pfn(mem_blk
->phys_index
);
384 sect_end_pfn
= sect_start_pfn
+ PAGES_PER_SECTION
- 1;
385 for (pfn
= sect_start_pfn
; pfn
<= sect_end_pfn
; pfn
++) {
388 nid
= get_nid_for_pfn(pfn
);
391 if (!node_online(nid
))
393 if (node_test_and_set(nid
, *unlinked_nodes
))
395 sysfs_remove_link(&node_devices
[nid
].sysdev
.kobj
,
396 kobject_name(&mem_blk
->sysdev
.kobj
));
397 sysfs_remove_link(&mem_blk
->sysdev
.kobj
,
398 kobject_name(&node_devices
[nid
].sysdev
.kobj
));
400 NODEMASK_FREE(unlinked_nodes
);
404 static int link_mem_sections(int nid
)
406 unsigned long start_pfn
= NODE_DATA(nid
)->node_start_pfn
;
407 unsigned long end_pfn
= start_pfn
+ NODE_DATA(nid
)->node_spanned_pages
;
411 for (pfn
= start_pfn
; pfn
< end_pfn
; pfn
+= PAGES_PER_SECTION
) {
412 unsigned long section_nr
= pfn_to_section_nr(pfn
);
413 struct mem_section
*mem_sect
;
414 struct memory_block
*mem_blk
;
417 if (!present_section_nr(section_nr
))
419 mem_sect
= __nr_to_section(section_nr
);
420 mem_blk
= find_memory_block(mem_sect
);
421 ret
= register_mem_sect_under_node(mem_blk
, nid
);
425 /* discard ref obtained in find_memory_block() */
426 kobject_put(&mem_blk
->sysdev
.kobj
);
431 #ifdef CONFIG_HUGETLBFS
433 * Handle per node hstate attribute [un]registration on transistions
434 * to/from memoryless state.
436 static void node_hugetlb_work(struct work_struct
*work
)
438 struct node
*node
= container_of(work
, struct node
, node_work
);
441 * We only get here when a node transitions to/from memoryless state.
442 * We can detect which transition occurred by examining whether the
443 * node has memory now. hugetlb_register_node() already check this
444 * so we try to register the attributes. If that fails, then the
445 * node has transitioned to memoryless, try to unregister the
448 if (!hugetlb_register_node(node
))
449 hugetlb_unregister_node(node
);
452 static void init_node_hugetlb_work(int nid
)
454 INIT_WORK(&node_devices
[nid
].node_work
, node_hugetlb_work
);
457 static int node_memory_callback(struct notifier_block
*self
,
458 unsigned long action
, void *arg
)
460 struct memory_notify
*mnb
= arg
;
461 int nid
= mnb
->status_change_nid
;
467 * offload per node hstate [un]registration to a work thread
468 * when transitioning to/from memoryless state.
470 if (nid
!= NUMA_NO_NODE
)
471 schedule_work(&node_devices
[nid
].node_work
);
474 case MEM_GOING_ONLINE
:
475 case MEM_GOING_OFFLINE
:
476 case MEM_CANCEL_ONLINE
:
477 case MEM_CANCEL_OFFLINE
:
484 #endif /* CONFIG_HUGETLBFS */
485 #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */
487 static int link_mem_sections(int nid
) { return 0; }
488 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
490 #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
491 !defined(CONFIG_HUGETLBFS)
492 static inline int node_memory_callback(struct notifier_block
*self
,
493 unsigned long action
, void *arg
)
498 static void init_node_hugetlb_work(int nid
) { }
502 int register_one_node(int nid
)
507 if (node_online(nid
)) {
508 int p_node
= parent_node(nid
);
509 struct node
*parent
= NULL
;
512 parent
= &node_devices
[p_node
];
514 error
= register_node(&node_devices
[nid
], nid
, parent
);
516 /* link cpu under this node */
517 for_each_present_cpu(cpu
) {
518 if (cpu_to_node(cpu
) == nid
)
519 register_cpu_under_node(cpu
, nid
);
522 /* link memory sections under this node */
523 error
= link_mem_sections(nid
);
525 /* initialize work queue for memory hot plug */
526 init_node_hugetlb_work(nid
);
533 void unregister_one_node(int nid
)
535 unregister_node(&node_devices
[nid
]);
539 * node states attributes
542 static ssize_t
print_nodes_state(enum node_states state
, char *buf
)
546 n
= nodelist_scnprintf(buf
, PAGE_SIZE
, node_states
[state
]);
547 if (n
> 0 && PAGE_SIZE
> n
+ 1) {
555 struct sysdev_class_attribute attr
;
556 enum node_states state
;
559 static ssize_t
show_node_state(struct sysdev_class
*class,
560 struct sysdev_class_attribute
*attr
, char *buf
)
562 struct node_attr
*na
= container_of(attr
, struct node_attr
, attr
);
563 return print_nodes_state(na
->state
, buf
);
566 #define _NODE_ATTR(name, state) \
567 { _SYSDEV_CLASS_ATTR(name, 0444, show_node_state, NULL), state }
569 static struct node_attr node_state_attr
[] = {
570 _NODE_ATTR(possible
, N_POSSIBLE
),
571 _NODE_ATTR(online
, N_ONLINE
),
572 _NODE_ATTR(has_normal_memory
, N_NORMAL_MEMORY
),
573 _NODE_ATTR(has_cpu
, N_CPU
),
574 #ifdef CONFIG_HIGHMEM
575 _NODE_ATTR(has_high_memory
, N_HIGH_MEMORY
),
579 static struct sysdev_class_attribute
*node_state_attrs
[] = {
580 &node_state_attr
[0].attr
,
581 &node_state_attr
[1].attr
,
582 &node_state_attr
[2].attr
,
583 &node_state_attr
[3].attr
,
584 #ifdef CONFIG_HIGHMEM
585 &node_state_attr
[4].attr
,
590 #define NODE_CALLBACK_PRI 2 /* lower than SLAB */
591 static int __init
register_node_type(void)
595 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr
) != NR_NODE_STATES
);
596 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs
)-1 != NR_NODE_STATES
);
598 ret
= sysdev_class_register(&node_class
);
600 hotplug_memory_notifier(node_memory_callback
,
605 * Note: we're not going to unregister the node class if we fail
606 * to register the node state class attribute files.
610 postcore_initcall(register_node_type
);