2 * Basic Node interface support
5 #include <linux/module.h>
6 #include <linux/init.h>
8 #include <linux/memory.h>
9 #include <linux/vmstat.h>
10 #include <linux/notifier.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>
22 static struct bus_type node_subsys
= {
28 static ssize_t
node_read_cpumap(struct device
*dev
, bool list
, char *buf
)
30 struct node
*node_dev
= to_node(dev
);
31 const struct cpumask
*mask
= cpumask_of_node(node_dev
->dev
.id
);
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));
36 return cpumap_print_to_pagebuf(list
, buf
, mask
);
39 static inline ssize_t
node_read_cpumask(struct device
*dev
,
40 struct device_attribute
*attr
, char *buf
)
42 return node_read_cpumap(dev
, false, buf
);
44 static inline ssize_t
node_read_cpulist(struct device
*dev
,
45 struct device_attribute
*attr
, char *buf
)
47 return node_read_cpumap(dev
, true, buf
);
50 static DEVICE_ATTR(cpumap
, S_IRUGO
, node_read_cpumask
, NULL
);
51 static DEVICE_ATTR(cpulist
, S_IRUGO
, node_read_cpulist
, NULL
);
53 #define K(x) ((x) << (PAGE_SHIFT - 10))
54 static ssize_t
node_read_meminfo(struct device
*dev
,
55 struct device_attribute
*attr
, char *buf
)
59 struct pglist_data
*pgdat
= NODE_DATA(nid
);
62 si_meminfo_node(&i
, nid
);
64 "Node %d MemTotal: %8lu kB\n"
65 "Node %d MemFree: %8lu kB\n"
66 "Node %d MemUsed: %8lu kB\n"
67 "Node %d Active: %8lu kB\n"
68 "Node %d Inactive: %8lu kB\n"
69 "Node %d Active(anon): %8lu kB\n"
70 "Node %d Inactive(anon): %8lu kB\n"
71 "Node %d Active(file): %8lu kB\n"
72 "Node %d Inactive(file): %8lu kB\n"
73 "Node %d Unevictable: %8lu kB\n"
74 "Node %d Mlocked: %8lu kB\n",
77 nid
, K(i
.totalram
- i
.freeram
),
78 nid
, K(node_page_state(pgdat
, NR_ACTIVE_ANON
) +
79 node_page_state(pgdat
, NR_ACTIVE_FILE
)),
80 nid
, K(node_page_state(pgdat
, NR_INACTIVE_ANON
) +
81 node_page_state(pgdat
, NR_INACTIVE_FILE
)),
82 nid
, K(node_page_state(pgdat
, NR_ACTIVE_ANON
)),
83 nid
, K(node_page_state(pgdat
, NR_INACTIVE_ANON
)),
84 nid
, K(node_page_state(pgdat
, NR_ACTIVE_FILE
)),
85 nid
, K(node_page_state(pgdat
, NR_INACTIVE_FILE
)),
86 nid
, K(node_page_state(pgdat
, NR_UNEVICTABLE
)),
87 nid
, K(sum_zone_node_page_state(nid
, NR_MLOCK
)));
91 "Node %d HighTotal: %8lu kB\n"
92 "Node %d HighFree: %8lu kB\n"
93 "Node %d LowTotal: %8lu kB\n"
94 "Node %d LowFree: %8lu kB\n",
97 nid
, K(i
.totalram
- i
.totalhigh
),
98 nid
, K(i
.freeram
- i
.freehigh
));
100 n
+= sprintf(buf
+ n
,
101 "Node %d Dirty: %8lu kB\n"
102 "Node %d Writeback: %8lu kB\n"
103 "Node %d FilePages: %8lu kB\n"
104 "Node %d Mapped: %8lu kB\n"
105 "Node %d AnonPages: %8lu kB\n"
106 "Node %d Shmem: %8lu kB\n"
107 "Node %d KernelStack: %8lu kB\n"
108 "Node %d PageTables: %8lu kB\n"
109 "Node %d NFS_Unstable: %8lu kB\n"
110 "Node %d Bounce: %8lu kB\n"
111 "Node %d WritebackTmp: %8lu kB\n"
112 "Node %d Slab: %8lu kB\n"
113 "Node %d SReclaimable: %8lu kB\n"
114 "Node %d SUnreclaim: %8lu kB\n"
115 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
116 "Node %d AnonHugePages: %8lu kB\n"
117 "Node %d ShmemHugePages: %8lu kB\n"
118 "Node %d ShmemPmdMapped: %8lu kB\n"
121 nid
, K(sum_zone_node_page_state(nid
, NR_FILE_DIRTY
)),
122 nid
, K(sum_zone_node_page_state(nid
, NR_WRITEBACK
)),
123 nid
, K(sum_zone_node_page_state(nid
, NR_FILE_PAGES
)),
124 nid
, K(sum_zone_node_page_state(nid
, NR_FILE_MAPPED
)),
125 nid
, K(sum_zone_node_page_state(nid
, NR_ANON_PAGES
)),
127 nid
, sum_zone_node_page_state(nid
, NR_KERNEL_STACK
) *
129 nid
, K(sum_zone_node_page_state(nid
, NR_PAGETABLE
)),
130 nid
, K(sum_zone_node_page_state(nid
, NR_UNSTABLE_NFS
)),
131 nid
, K(sum_zone_node_page_state(nid
, NR_BOUNCE
)),
132 nid
, K(sum_zone_node_page_state(nid
, NR_WRITEBACK_TEMP
)),
133 nid
, K(sum_zone_node_page_state(nid
, NR_SLAB_RECLAIMABLE
) +
134 sum_zone_node_page_state(nid
, NR_SLAB_UNRECLAIMABLE
)),
135 nid
, K(sum_zone_node_page_state(nid
, NR_SLAB_RECLAIMABLE
)),
136 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
137 nid
, K(sum_zone_node_page_state(nid
, NR_SLAB_UNRECLAIMABLE
)),
138 nid
, K(sum_zone_node_page_state(nid
, NR_ANON_THPS
) *
140 nid
, K(sum_zone_node_page_state(nid
, NR_SHMEM_THPS
) *
142 nid
, K(sum_zone_node_page_state(nid
, NR_SHMEM_PMDMAPPED
) *
145 nid
, K(sum_zone_node_page_state(nid
, NR_SLAB_UNRECLAIMABLE
)));
147 n
+= hugetlb_report_node_meminfo(nid
, buf
+ n
);
152 static DEVICE_ATTR(meminfo
, S_IRUGO
, node_read_meminfo
, NULL
);
154 static ssize_t
node_read_numastat(struct device
*dev
,
155 struct device_attribute
*attr
, char *buf
)
161 "interleave_hit %lu\n"
164 sum_zone_node_page_state(dev
->id
, NUMA_HIT
),
165 sum_zone_node_page_state(dev
->id
, NUMA_MISS
),
166 sum_zone_node_page_state(dev
->id
, NUMA_FOREIGN
),
167 sum_zone_node_page_state(dev
->id
, NUMA_INTERLEAVE_HIT
),
168 sum_zone_node_page_state(dev
->id
, NUMA_LOCAL
),
169 sum_zone_node_page_state(dev
->id
, NUMA_OTHER
));
171 static DEVICE_ATTR(numastat
, S_IRUGO
, node_read_numastat
, NULL
);
173 static ssize_t
node_read_vmstat(struct device
*dev
,
174 struct device_attribute
*attr
, char *buf
)
177 struct pglist_data
*pgdat
= NODE_DATA(nid
);
181 for (i
= 0; i
< NR_VM_ZONE_STAT_ITEMS
; i
++)
182 n
+= sprintf(buf
+n
, "%s %lu\n", vmstat_text
[i
],
183 sum_zone_node_page_state(nid
, i
));
185 for (i
= 0; i
< NR_VM_NODE_STAT_ITEMS
; i
++)
186 n
+= sprintf(buf
+n
, "%s %lu\n",
187 vmstat_text
[i
+ NR_VM_ZONE_STAT_ITEMS
],
188 node_page_state(pgdat
, i
));
192 static DEVICE_ATTR(vmstat
, S_IRUGO
, node_read_vmstat
, NULL
);
194 static ssize_t
node_read_distance(struct device
*dev
,
195 struct device_attribute
*attr
, char *buf
)
202 * buf is currently PAGE_SIZE in length and each node needs 4 chars
203 * at the most (distance + space or newline).
205 BUILD_BUG_ON(MAX_NUMNODES
* 4 > PAGE_SIZE
);
207 for_each_online_node(i
)
208 len
+= sprintf(buf
+ len
, "%s%d", i
? " " : "", node_distance(nid
, i
));
210 len
+= sprintf(buf
+ len
, "\n");
213 static DEVICE_ATTR(distance
, S_IRUGO
, node_read_distance
, NULL
);
215 static struct attribute
*node_dev_attrs
[] = {
216 &dev_attr_cpumap
.attr
,
217 &dev_attr_cpulist
.attr
,
218 &dev_attr_meminfo
.attr
,
219 &dev_attr_numastat
.attr
,
220 &dev_attr_distance
.attr
,
221 &dev_attr_vmstat
.attr
,
224 ATTRIBUTE_GROUPS(node_dev
);
226 #ifdef CONFIG_HUGETLBFS
228 * hugetlbfs per node attributes registration interface:
229 * When/if hugetlb[fs] subsystem initializes [sometime after this module],
230 * it will register its per node attributes for all online nodes with
231 * memory. It will also call register_hugetlbfs_with_node(), below, to
232 * register its attribute registration functions with this node driver.
233 * Once these hooks have been initialized, the node driver will call into
234 * the hugetlb module to [un]register attributes for hot-plugged nodes.
236 static node_registration_func_t __hugetlb_register_node
;
237 static node_registration_func_t __hugetlb_unregister_node
;
239 static inline bool hugetlb_register_node(struct node
*node
)
241 if (__hugetlb_register_node
&&
242 node_state(node
->dev
.id
, N_MEMORY
)) {
243 __hugetlb_register_node(node
);
249 static inline void hugetlb_unregister_node(struct node
*node
)
251 if (__hugetlb_unregister_node
)
252 __hugetlb_unregister_node(node
);
255 void register_hugetlbfs_with_node(node_registration_func_t doregister
,
256 node_registration_func_t unregister
)
258 __hugetlb_register_node
= doregister
;
259 __hugetlb_unregister_node
= unregister
;
262 static inline void hugetlb_register_node(struct node
*node
) {}
264 static inline void hugetlb_unregister_node(struct node
*node
) {}
267 static void node_device_release(struct device
*dev
)
269 struct node
*node
= to_node(dev
);
271 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
273 * We schedule the work only when a memory section is
274 * onlined/offlined on this node. When we come here,
275 * all the memory on this node has been offlined,
276 * so we won't enqueue new work to this work.
278 * The work is using node->node_work, so we should
279 * flush work before freeing the memory.
281 flush_work(&node
->node_work
);
287 * register_node - Setup a sysfs device for a node.
288 * @num - Node number to use when creating the device.
290 * Initialize and register the node device.
292 static int register_node(struct node
*node
, int num
, struct node
*parent
)
297 node
->dev
.bus
= &node_subsys
;
298 node
->dev
.release
= node_device_release
;
299 node
->dev
.groups
= node_dev_groups
;
300 error
= device_register(&node
->dev
);
303 hugetlb_register_node(node
);
305 compaction_register_node(node
);
311 * unregister_node - unregister a node device
312 * @node: node going away
314 * Unregisters a node device @node. All the devices on the node must be
315 * unregistered before calling this function.
317 void unregister_node(struct node
*node
)
319 hugetlb_unregister_node(node
); /* no-op, if memoryless node */
321 device_unregister(&node
->dev
);
324 struct node
*node_devices
[MAX_NUMNODES
];
327 * register cpu under node
329 int register_cpu_under_node(unsigned int cpu
, unsigned int nid
)
334 if (!node_online(nid
))
337 obj
= get_cpu_device(cpu
);
341 ret
= sysfs_create_link(&node_devices
[nid
]->dev
.kobj
,
343 kobject_name(&obj
->kobj
));
347 return sysfs_create_link(&obj
->kobj
,
348 &node_devices
[nid
]->dev
.kobj
,
349 kobject_name(&node_devices
[nid
]->dev
.kobj
));
352 int unregister_cpu_under_node(unsigned int cpu
, unsigned int nid
)
356 if (!node_online(nid
))
359 obj
= get_cpu_device(cpu
);
363 sysfs_remove_link(&node_devices
[nid
]->dev
.kobj
,
364 kobject_name(&obj
->kobj
));
365 sysfs_remove_link(&obj
->kobj
,
366 kobject_name(&node_devices
[nid
]->dev
.kobj
));
371 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
372 #define page_initialized(page) (page->lru.next)
374 static int __init_refok
get_nid_for_pfn(unsigned long pfn
)
378 if (!pfn_valid_within(pfn
))
380 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
381 if (system_state
== SYSTEM_BOOTING
)
382 return early_pfn_to_nid(pfn
);
384 page
= pfn_to_page(pfn
);
385 if (!page_initialized(page
))
387 return pfn_to_nid(pfn
);
390 /* register memory section under specified node if it spans that node */
391 int register_mem_sect_under_node(struct memory_block
*mem_blk
, int nid
)
394 unsigned long pfn
, sect_start_pfn
, sect_end_pfn
;
398 if (!node_online(nid
))
401 sect_start_pfn
= section_nr_to_pfn(mem_blk
->start_section_nr
);
402 sect_end_pfn
= section_nr_to_pfn(mem_blk
->end_section_nr
);
403 sect_end_pfn
+= PAGES_PER_SECTION
- 1;
404 for (pfn
= sect_start_pfn
; pfn
<= sect_end_pfn
; pfn
++) {
408 * memory block could have several absent sections from start.
409 * skip pfn range from absent section
411 if (!pfn_present(pfn
)) {
412 pfn
= round_down(pfn
+ PAGES_PER_SECTION
,
413 PAGES_PER_SECTION
) - 1;
417 page_nid
= get_nid_for_pfn(pfn
);
422 ret
= sysfs_create_link_nowarn(&node_devices
[nid
]->dev
.kobj
,
424 kobject_name(&mem_blk
->dev
.kobj
));
428 return sysfs_create_link_nowarn(&mem_blk
->dev
.kobj
,
429 &node_devices
[nid
]->dev
.kobj
,
430 kobject_name(&node_devices
[nid
]->dev
.kobj
));
432 /* mem section does not span the specified node */
436 /* unregister memory section under all nodes that it spans */
437 int unregister_mem_sect_under_nodes(struct memory_block
*mem_blk
,
438 unsigned long phys_index
)
440 NODEMASK_ALLOC(nodemask_t
, unlinked_nodes
, GFP_KERNEL
);
441 unsigned long pfn
, sect_start_pfn
, sect_end_pfn
;
444 NODEMASK_FREE(unlinked_nodes
);
449 nodes_clear(*unlinked_nodes
);
451 sect_start_pfn
= section_nr_to_pfn(phys_index
);
452 sect_end_pfn
= sect_start_pfn
+ PAGES_PER_SECTION
- 1;
453 for (pfn
= sect_start_pfn
; pfn
<= sect_end_pfn
; pfn
++) {
456 nid
= get_nid_for_pfn(pfn
);
459 if (!node_online(nid
))
461 if (node_test_and_set(nid
, *unlinked_nodes
))
463 sysfs_remove_link(&node_devices
[nid
]->dev
.kobj
,
464 kobject_name(&mem_blk
->dev
.kobj
));
465 sysfs_remove_link(&mem_blk
->dev
.kobj
,
466 kobject_name(&node_devices
[nid
]->dev
.kobj
));
468 NODEMASK_FREE(unlinked_nodes
);
472 static int link_mem_sections(int nid
)
474 unsigned long start_pfn
= NODE_DATA(nid
)->node_start_pfn
;
475 unsigned long end_pfn
= start_pfn
+ NODE_DATA(nid
)->node_spanned_pages
;
477 struct memory_block
*mem_blk
= NULL
;
480 for (pfn
= start_pfn
; pfn
< end_pfn
; pfn
+= PAGES_PER_SECTION
) {
481 unsigned long section_nr
= pfn_to_section_nr(pfn
);
482 struct mem_section
*mem_sect
;
485 if (!present_section_nr(section_nr
))
487 mem_sect
= __nr_to_section(section_nr
);
489 /* same memblock ? */
491 if ((section_nr
>= mem_blk
->start_section_nr
) &&
492 (section_nr
<= mem_blk
->end_section_nr
))
495 mem_blk
= find_memory_block_hinted(mem_sect
, mem_blk
);
497 ret
= register_mem_sect_under_node(mem_blk
, nid
);
501 /* discard ref obtained in find_memory_block() */
505 kobject_put(&mem_blk
->dev
.kobj
);
509 #ifdef CONFIG_HUGETLBFS
511 * Handle per node hstate attribute [un]registration on transistions
512 * to/from memoryless state.
514 static void node_hugetlb_work(struct work_struct
*work
)
516 struct node
*node
= container_of(work
, struct node
, node_work
);
519 * We only get here when a node transitions to/from memoryless state.
520 * We can detect which transition occurred by examining whether the
521 * node has memory now. hugetlb_register_node() already check this
522 * so we try to register the attributes. If that fails, then the
523 * node has transitioned to memoryless, try to unregister the
526 if (!hugetlb_register_node(node
))
527 hugetlb_unregister_node(node
);
530 static void init_node_hugetlb_work(int nid
)
532 INIT_WORK(&node_devices
[nid
]->node_work
, node_hugetlb_work
);
535 static int node_memory_callback(struct notifier_block
*self
,
536 unsigned long action
, void *arg
)
538 struct memory_notify
*mnb
= arg
;
539 int nid
= mnb
->status_change_nid
;
545 * offload per node hstate [un]registration to a work thread
546 * when transitioning to/from memoryless state.
548 if (nid
!= NUMA_NO_NODE
)
549 schedule_work(&node_devices
[nid
]->node_work
);
552 case MEM_GOING_ONLINE
:
553 case MEM_GOING_OFFLINE
:
554 case MEM_CANCEL_ONLINE
:
555 case MEM_CANCEL_OFFLINE
:
562 #endif /* CONFIG_HUGETLBFS */
563 #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */
565 static int link_mem_sections(int nid
) { return 0; }
566 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
568 #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
569 !defined(CONFIG_HUGETLBFS)
570 static inline int node_memory_callback(struct notifier_block
*self
,
571 unsigned long action
, void *arg
)
576 static void init_node_hugetlb_work(int nid
) { }
580 int register_one_node(int nid
)
585 if (node_online(nid
)) {
586 int p_node
= parent_node(nid
);
587 struct node
*parent
= NULL
;
590 parent
= node_devices
[p_node
];
592 node_devices
[nid
] = kzalloc(sizeof(struct node
), GFP_KERNEL
);
593 if (!node_devices
[nid
])
596 error
= register_node(node_devices
[nid
], nid
, parent
);
598 /* link cpu under this node */
599 for_each_present_cpu(cpu
) {
600 if (cpu_to_node(cpu
) == nid
)
601 register_cpu_under_node(cpu
, nid
);
604 /* link memory sections under this node */
605 error
= link_mem_sections(nid
);
607 /* initialize work queue for memory hot plug */
608 init_node_hugetlb_work(nid
);
615 void unregister_one_node(int nid
)
617 if (!node_devices
[nid
])
620 unregister_node(node_devices
[nid
]);
621 node_devices
[nid
] = NULL
;
625 * node states attributes
628 static ssize_t
print_nodes_state(enum node_states state
, char *buf
)
632 n
= scnprintf(buf
, PAGE_SIZE
- 1, "%*pbl",
633 nodemask_pr_args(&node_states
[state
]));
640 struct device_attribute attr
;
641 enum node_states state
;
644 static ssize_t
show_node_state(struct device
*dev
,
645 struct device_attribute
*attr
, char *buf
)
647 struct node_attr
*na
= container_of(attr
, struct node_attr
, attr
);
648 return print_nodes_state(na
->state
, buf
);
651 #define _NODE_ATTR(name, state) \
652 { __ATTR(name, 0444, show_node_state, NULL), state }
654 static struct node_attr node_state_attr
[] = {
655 [N_POSSIBLE
] = _NODE_ATTR(possible
, N_POSSIBLE
),
656 [N_ONLINE
] = _NODE_ATTR(online
, N_ONLINE
),
657 [N_NORMAL_MEMORY
] = _NODE_ATTR(has_normal_memory
, N_NORMAL_MEMORY
),
658 #ifdef CONFIG_HIGHMEM
659 [N_HIGH_MEMORY
] = _NODE_ATTR(has_high_memory
, N_HIGH_MEMORY
),
661 #ifdef CONFIG_MOVABLE_NODE
662 [N_MEMORY
] = _NODE_ATTR(has_memory
, N_MEMORY
),
664 [N_CPU
] = _NODE_ATTR(has_cpu
, N_CPU
),
667 static struct attribute
*node_state_attrs
[] = {
668 &node_state_attr
[N_POSSIBLE
].attr
.attr
,
669 &node_state_attr
[N_ONLINE
].attr
.attr
,
670 &node_state_attr
[N_NORMAL_MEMORY
].attr
.attr
,
671 #ifdef CONFIG_HIGHMEM
672 &node_state_attr
[N_HIGH_MEMORY
].attr
.attr
,
674 #ifdef CONFIG_MOVABLE_NODE
675 &node_state_attr
[N_MEMORY
].attr
.attr
,
677 &node_state_attr
[N_CPU
].attr
.attr
,
681 static struct attribute_group memory_root_attr_group
= {
682 .attrs
= node_state_attrs
,
685 static const struct attribute_group
*cpu_root_attr_groups
[] = {
686 &memory_root_attr_group
,
690 #define NODE_CALLBACK_PRI 2 /* lower than SLAB */
691 static int __init
register_node_type(void)
695 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr
) != NR_NODE_STATES
);
696 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs
)-1 != NR_NODE_STATES
);
698 ret
= subsys_system_register(&node_subsys
, cpu_root_attr_groups
);
700 static struct notifier_block node_memory_callback_nb
= {
701 .notifier_call
= node_memory_callback
,
702 .priority
= NODE_CALLBACK_PRI
,
704 register_hotmemory_notifier(&node_memory_callback_nb
);
708 * Note: we're not going to unregister the node class if we fail
709 * to register the node state class attribute files.
713 postcore_initcall(register_node_type
);