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>
19 static struct sysdev_class node_class
= {
24 static ssize_t
node_read_cpumap(struct sys_device
*dev
, int type
, char *buf
)
26 struct node
*node_dev
= to_node(dev
);
27 const struct cpumask
*mask
= cpumask_of_node(node_dev
->sysdev
.id
);
30 /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
31 BUILD_BUG_ON((NR_CPUS
/32 * 9) > (PAGE_SIZE
-1));
34 cpulist_scnprintf(buf
, PAGE_SIZE
-2, mask
) :
35 cpumask_scnprintf(buf
, PAGE_SIZE
-2, mask
);
41 static inline ssize_t
node_read_cpumask(struct sys_device
*dev
,
42 struct sysdev_attribute
*attr
, char *buf
)
44 return node_read_cpumap(dev
, 0, buf
);
46 static inline ssize_t
node_read_cpulist(struct sys_device
*dev
,
47 struct sysdev_attribute
*attr
, char *buf
)
49 return node_read_cpumap(dev
, 1, buf
);
52 static SYSDEV_ATTR(cpumap
, S_IRUGO
, node_read_cpumask
, NULL
);
53 static SYSDEV_ATTR(cpulist
, S_IRUGO
, node_read_cpulist
, NULL
);
55 #define K(x) ((x) << (PAGE_SHIFT - 10))
56 static ssize_t
node_read_meminfo(struct sys_device
* dev
,
57 struct sysdev_attribute
*attr
, char * buf
)
63 si_meminfo_node(&i
, nid
);
66 "Node %d MemTotal: %8lu kB\n"
67 "Node %d MemFree: %8lu kB\n"
68 "Node %d MemUsed: %8lu kB\n"
69 "Node %d Active: %8lu kB\n"
70 "Node %d Inactive: %8lu kB\n"
71 "Node %d Active(anon): %8lu kB\n"
72 "Node %d Inactive(anon): %8lu kB\n"
73 "Node %d Active(file): %8lu kB\n"
74 "Node %d Inactive(file): %8lu kB\n"
75 "Node %d Unevictable: %8lu kB\n"
76 "Node %d Mlocked: %8lu kB\n"
78 "Node %d HighTotal: %8lu kB\n"
79 "Node %d HighFree: %8lu kB\n"
80 "Node %d LowTotal: %8lu kB\n"
81 "Node %d LowFree: %8lu kB\n"
83 "Node %d Dirty: %8lu kB\n"
84 "Node %d Writeback: %8lu kB\n"
85 "Node %d FilePages: %8lu kB\n"
86 "Node %d Mapped: %8lu kB\n"
87 "Node %d AnonPages: %8lu kB\n"
88 "Node %d Shmem: %8lu kB\n"
89 "Node %d KernelStack: %8lu kB\n"
90 "Node %d PageTables: %8lu kB\n"
91 "Node %d NFS_Unstable: %8lu kB\n"
92 "Node %d Bounce: %8lu kB\n"
93 "Node %d WritebackTmp: %8lu kB\n"
94 "Node %d Slab: %8lu kB\n"
95 "Node %d SReclaimable: %8lu kB\n"
96 "Node %d SUnreclaim: %8lu kB\n",
99 nid
, K(i
.totalram
- i
.freeram
),
100 nid
, K(node_page_state(nid
, NR_ACTIVE_ANON
) +
101 node_page_state(nid
, NR_ACTIVE_FILE
)),
102 nid
, K(node_page_state(nid
, NR_INACTIVE_ANON
) +
103 node_page_state(nid
, NR_INACTIVE_FILE
)),
104 nid
, K(node_page_state(nid
, NR_ACTIVE_ANON
)),
105 nid
, K(node_page_state(nid
, NR_INACTIVE_ANON
)),
106 nid
, K(node_page_state(nid
, NR_ACTIVE_FILE
)),
107 nid
, K(node_page_state(nid
, NR_INACTIVE_FILE
)),
108 nid
, K(node_page_state(nid
, NR_UNEVICTABLE
)),
109 nid
, K(node_page_state(nid
, NR_MLOCK
)),
110 #ifdef CONFIG_HIGHMEM
113 nid
, K(i
.totalram
- i
.totalhigh
),
114 nid
, K(i
.freeram
- i
.freehigh
),
116 nid
, K(node_page_state(nid
, NR_FILE_DIRTY
)),
117 nid
, K(node_page_state(nid
, NR_WRITEBACK
)),
118 nid
, K(node_page_state(nid
, NR_FILE_PAGES
)),
119 nid
, K(node_page_state(nid
, NR_FILE_MAPPED
)),
120 nid
, K(node_page_state(nid
, NR_ANON_PAGES
)),
121 nid
, K(node_page_state(nid
, NR_SHMEM
)),
122 nid
, node_page_state(nid
, NR_KERNEL_STACK
) *
124 nid
, K(node_page_state(nid
, NR_PAGETABLE
)),
125 nid
, K(node_page_state(nid
, NR_UNSTABLE_NFS
)),
126 nid
, K(node_page_state(nid
, NR_BOUNCE
)),
127 nid
, K(node_page_state(nid
, NR_WRITEBACK_TEMP
)),
128 nid
, K(node_page_state(nid
, NR_SLAB_RECLAIMABLE
) +
129 node_page_state(nid
, NR_SLAB_UNRECLAIMABLE
)),
130 nid
, K(node_page_state(nid
, NR_SLAB_RECLAIMABLE
)),
131 nid
, K(node_page_state(nid
, NR_SLAB_UNRECLAIMABLE
)));
132 n
+= hugetlb_report_node_meminfo(nid
, buf
+ n
);
137 static SYSDEV_ATTR(meminfo
, S_IRUGO
, node_read_meminfo
, NULL
);
139 static ssize_t
node_read_numastat(struct sys_device
* dev
,
140 struct sysdev_attribute
*attr
, char * buf
)
146 "interleave_hit %lu\n"
149 node_page_state(dev
->id
, NUMA_HIT
),
150 node_page_state(dev
->id
, NUMA_MISS
),
151 node_page_state(dev
->id
, NUMA_FOREIGN
),
152 node_page_state(dev
->id
, NUMA_INTERLEAVE_HIT
),
153 node_page_state(dev
->id
, NUMA_LOCAL
),
154 node_page_state(dev
->id
, NUMA_OTHER
));
156 static SYSDEV_ATTR(numastat
, S_IRUGO
, node_read_numastat
, NULL
);
158 static ssize_t
node_read_distance(struct sys_device
* dev
,
159 struct sysdev_attribute
*attr
, char * buf
)
165 /* buf currently PAGE_SIZE, need ~4 chars per node */
166 BUILD_BUG_ON(MAX_NUMNODES
*4 > PAGE_SIZE
/2);
168 for_each_online_node(i
)
169 len
+= sprintf(buf
+ len
, "%s%d", i
? " " : "", node_distance(nid
, i
));
171 len
+= sprintf(buf
+ len
, "\n");
174 static SYSDEV_ATTR(distance
, S_IRUGO
, node_read_distance
, NULL
);
176 #ifdef CONFIG_HUGETLBFS
178 * hugetlbfs per node attributes registration interface:
179 * When/if hugetlb[fs] subsystem initializes [sometime after this module],
180 * it will register its per node attributes for all online nodes with
181 * memory. It will also call register_hugetlbfs_with_node(), below, to
182 * register its attribute registration functions with this node driver.
183 * Once these hooks have been initialized, the node driver will call into
184 * the hugetlb module to [un]register attributes for hot-plugged nodes.
186 static node_registration_func_t __hugetlb_register_node
;
187 static node_registration_func_t __hugetlb_unregister_node
;
189 static inline bool hugetlb_register_node(struct node
*node
)
191 if (__hugetlb_register_node
&&
192 node_state(node
->sysdev
.id
, N_HIGH_MEMORY
)) {
193 __hugetlb_register_node(node
);
199 static inline void hugetlb_unregister_node(struct node
*node
)
201 if (__hugetlb_unregister_node
)
202 __hugetlb_unregister_node(node
);
205 void register_hugetlbfs_with_node(node_registration_func_t doregister
,
206 node_registration_func_t unregister
)
208 __hugetlb_register_node
= doregister
;
209 __hugetlb_unregister_node
= unregister
;
212 static inline void hugetlb_register_node(struct node
*node
) {}
214 static inline void hugetlb_unregister_node(struct node
*node
) {}
219 * register_node - Setup a sysfs device for a node.
220 * @num - Node number to use when creating the device.
222 * Initialize and register the node device.
224 int register_node(struct node
*node
, int num
, struct node
*parent
)
228 node
->sysdev
.id
= num
;
229 node
->sysdev
.cls
= &node_class
;
230 error
= sysdev_register(&node
->sysdev
);
233 sysdev_create_file(&node
->sysdev
, &attr_cpumap
);
234 sysdev_create_file(&node
->sysdev
, &attr_cpulist
);
235 sysdev_create_file(&node
->sysdev
, &attr_meminfo
);
236 sysdev_create_file(&node
->sysdev
, &attr_numastat
);
237 sysdev_create_file(&node
->sysdev
, &attr_distance
);
239 scan_unevictable_register_node(node
);
241 hugetlb_register_node(node
);
247 * unregister_node - unregister a node device
248 * @node: node going away
250 * Unregisters a node device @node. All the devices on the node must be
251 * unregistered before calling this function.
253 void unregister_node(struct node
*node
)
255 sysdev_remove_file(&node
->sysdev
, &attr_cpumap
);
256 sysdev_remove_file(&node
->sysdev
, &attr_cpulist
);
257 sysdev_remove_file(&node
->sysdev
, &attr_meminfo
);
258 sysdev_remove_file(&node
->sysdev
, &attr_numastat
);
259 sysdev_remove_file(&node
->sysdev
, &attr_distance
);
261 scan_unevictable_unregister_node(node
);
262 hugetlb_unregister_node(node
); /* no-op, if memoryless node */
264 sysdev_unregister(&node
->sysdev
);
267 struct node node_devices
[MAX_NUMNODES
];
270 * register cpu under node
272 int register_cpu_under_node(unsigned int cpu
, unsigned int nid
)
274 struct sys_device
*obj
;
276 if (!node_online(nid
))
279 obj
= get_cpu_sysdev(cpu
);
283 return sysfs_create_link(&node_devices
[nid
].sysdev
.kobj
,
285 kobject_name(&obj
->kobj
));
288 int unregister_cpu_under_node(unsigned int cpu
, unsigned int nid
)
290 struct sys_device
*obj
;
292 if (!node_online(nid
))
295 obj
= get_cpu_sysdev(cpu
);
299 sysfs_remove_link(&node_devices
[nid
].sysdev
.kobj
,
300 kobject_name(&obj
->kobj
));
305 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
306 #define page_initialized(page) (page->lru.next)
308 static int get_nid_for_pfn(unsigned long pfn
)
312 if (!pfn_valid_within(pfn
))
314 page
= pfn_to_page(pfn
);
315 if (!page_initialized(page
))
317 return pfn_to_nid(pfn
);
320 /* register memory section under specified node if it spans that node */
321 int register_mem_sect_under_node(struct memory_block
*mem_blk
, int nid
)
324 unsigned long pfn
, sect_start_pfn
, sect_end_pfn
;
328 if (!node_online(nid
))
330 sect_start_pfn
= section_nr_to_pfn(mem_blk
->phys_index
);
331 sect_end_pfn
= sect_start_pfn
+ PAGES_PER_SECTION
- 1;
332 for (pfn
= sect_start_pfn
; pfn
<= sect_end_pfn
; pfn
++) {
335 page_nid
= get_nid_for_pfn(pfn
);
340 ret
= sysfs_create_link_nowarn(&node_devices
[nid
].sysdev
.kobj
,
341 &mem_blk
->sysdev
.kobj
,
342 kobject_name(&mem_blk
->sysdev
.kobj
));
346 return sysfs_create_link_nowarn(&mem_blk
->sysdev
.kobj
,
347 &node_devices
[nid
].sysdev
.kobj
,
348 kobject_name(&node_devices
[nid
].sysdev
.kobj
));
350 /* mem section does not span the specified node */
354 /* unregister memory section under all nodes that it spans */
355 int unregister_mem_sect_under_nodes(struct memory_block
*mem_blk
)
357 nodemask_t unlinked_nodes
;
358 unsigned long pfn
, sect_start_pfn
, sect_end_pfn
;
362 nodes_clear(unlinked_nodes
);
363 sect_start_pfn
= section_nr_to_pfn(mem_blk
->phys_index
);
364 sect_end_pfn
= sect_start_pfn
+ PAGES_PER_SECTION
- 1;
365 for (pfn
= sect_start_pfn
; pfn
<= sect_end_pfn
; pfn
++) {
368 nid
= get_nid_for_pfn(pfn
);
371 if (!node_online(nid
))
373 if (node_test_and_set(nid
, unlinked_nodes
))
375 sysfs_remove_link(&node_devices
[nid
].sysdev
.kobj
,
376 kobject_name(&mem_blk
->sysdev
.kobj
));
377 sysfs_remove_link(&mem_blk
->sysdev
.kobj
,
378 kobject_name(&node_devices
[nid
].sysdev
.kobj
));
383 static int link_mem_sections(int nid
)
385 unsigned long start_pfn
= NODE_DATA(nid
)->node_start_pfn
;
386 unsigned long end_pfn
= start_pfn
+ NODE_DATA(nid
)->node_spanned_pages
;
390 for (pfn
= start_pfn
; pfn
< end_pfn
; pfn
+= PAGES_PER_SECTION
) {
391 unsigned long section_nr
= pfn_to_section_nr(pfn
);
392 struct mem_section
*mem_sect
;
393 struct memory_block
*mem_blk
;
396 if (!present_section_nr(section_nr
))
398 mem_sect
= __nr_to_section(section_nr
);
399 mem_blk
= find_memory_block(mem_sect
);
400 ret
= register_mem_sect_under_node(mem_blk
, nid
);
404 /* discard ref obtained in find_memory_block() */
405 kobject_put(&mem_blk
->sysdev
.kobj
);
410 #ifdef CONFIG_HUGETLBFS
412 * Handle per node hstate attribute [un]registration on transistions
413 * to/from memoryless state.
415 static void node_hugetlb_work(struct work_struct
*work
)
417 struct node
*node
= container_of(work
, struct node
, node_work
);
420 * We only get here when a node transitions to/from memoryless state.
421 * We can detect which transition occurred by examining whether the
422 * node has memory now. hugetlb_register_node() already check this
423 * so we try to register the attributes. If that fails, then the
424 * node has transitioned to memoryless, try to unregister the
427 if (!hugetlb_register_node(node
))
428 hugetlb_unregister_node(node
);
431 static void init_node_hugetlb_work(int nid
)
433 INIT_WORK(&node_devices
[nid
].node_work
, node_hugetlb_work
);
436 static int node_memory_callback(struct notifier_block
*self
,
437 unsigned long action
, void *arg
)
439 struct memory_notify
*mnb
= arg
;
440 int nid
= mnb
->status_change_nid
;
446 * offload per node hstate [un]registration to a work thread
447 * when transitioning to/from memoryless state.
449 if (nid
!= NUMA_NO_NODE
)
450 schedule_work(&node_devices
[nid
].node_work
);
453 case MEM_GOING_ONLINE
:
454 case MEM_GOING_OFFLINE
:
455 case MEM_CANCEL_ONLINE
:
456 case MEM_CANCEL_OFFLINE
:
463 #endif /* CONFIG_HUGETLBFS */
464 #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */
466 static int link_mem_sections(int nid
) { return 0; }
467 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
469 #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
470 !defined(CONFIG_HUGETLBFS)
471 static inline int node_memory_callback(struct notifier_block
*self
,
472 unsigned long action
, void *arg
)
477 static void init_node_hugetlb_work(int nid
) { }
481 int register_one_node(int nid
)
486 if (node_online(nid
)) {
487 int p_node
= parent_node(nid
);
488 struct node
*parent
= NULL
;
491 parent
= &node_devices
[p_node
];
493 error
= register_node(&node_devices
[nid
], nid
, parent
);
495 /* link cpu under this node */
496 for_each_present_cpu(cpu
) {
497 if (cpu_to_node(cpu
) == nid
)
498 register_cpu_under_node(cpu
, nid
);
501 /* link memory sections under this node */
502 error
= link_mem_sections(nid
);
504 /* initialize work queue for memory hot plug */
505 init_node_hugetlb_work(nid
);
512 void unregister_one_node(int nid
)
514 unregister_node(&node_devices
[nid
]);
518 * node states attributes
521 static ssize_t
print_nodes_state(enum node_states state
, char *buf
)
525 n
= nodelist_scnprintf(buf
, PAGE_SIZE
, node_states
[state
]);
526 if (n
> 0 && PAGE_SIZE
> n
+ 1) {
533 static ssize_t
print_nodes_possible(struct sysdev_class
*class, char *buf
)
535 return print_nodes_state(N_POSSIBLE
, buf
);
538 static ssize_t
print_nodes_online(struct sysdev_class
*class, char *buf
)
540 return print_nodes_state(N_ONLINE
, buf
);
543 static ssize_t
print_nodes_has_normal_memory(struct sysdev_class
*class,
546 return print_nodes_state(N_NORMAL_MEMORY
, buf
);
549 static ssize_t
print_nodes_has_cpu(struct sysdev_class
*class, char *buf
)
551 return print_nodes_state(N_CPU
, buf
);
554 static SYSDEV_CLASS_ATTR(possible
, 0444, print_nodes_possible
, NULL
);
555 static SYSDEV_CLASS_ATTR(online
, 0444, print_nodes_online
, NULL
);
556 static SYSDEV_CLASS_ATTR(has_normal_memory
, 0444, print_nodes_has_normal_memory
,
558 static SYSDEV_CLASS_ATTR(has_cpu
, 0444, print_nodes_has_cpu
, NULL
);
560 #ifdef CONFIG_HIGHMEM
561 static ssize_t
print_nodes_has_high_memory(struct sysdev_class
*class,
564 return print_nodes_state(N_HIGH_MEMORY
, buf
);
567 static SYSDEV_CLASS_ATTR(has_high_memory
, 0444, print_nodes_has_high_memory
,
571 struct sysdev_class_attribute
*node_state_attr
[] = {
574 &attr_has_normal_memory
,
575 #ifdef CONFIG_HIGHMEM
576 &attr_has_high_memory
,
581 static int node_states_init(void)
586 for (i
= 0; i
< NR_NODE_STATES
; i
++) {
588 ret
= sysdev_class_create_file(&node_class
, node_state_attr
[i
]);
595 #define NODE_CALLBACK_PRI 2 /* lower than SLAB */
596 static int __init
register_node_type(void)
600 ret
= sysdev_class_register(&node_class
);
602 ret
= node_states_init();
603 hotplug_memory_notifier(node_memory_callback
,
608 * Note: we're not going to unregister the node class if we fail
609 * to register the node state class attribute files.
613 postcore_initcall(register_node_type
);