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/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>
21 static struct bus_type node_subsys
= {
27 static ssize_t
node_read_cpumap(struct device
*dev
, int type
, char *buf
)
29 struct node
*node_dev
= to_node(dev
);
30 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));
37 cpulist_scnprintf(buf
, PAGE_SIZE
-2, mask
) :
38 cpumask_scnprintf(buf
, PAGE_SIZE
-2, mask
);
44 static inline ssize_t
node_read_cpumask(struct device
*dev
,
45 struct device_attribute
*attr
, char *buf
)
47 return node_read_cpumap(dev
, 0, buf
);
49 static inline ssize_t
node_read_cpulist(struct device
*dev
,
50 struct device_attribute
*attr
, char *buf
)
52 return node_read_cpumap(dev
, 1, buf
);
55 static DEVICE_ATTR(cpumap
, S_IRUGO
, node_read_cpumask
, NULL
);
56 static DEVICE_ATTR(cpulist
, S_IRUGO
, node_read_cpulist
, NULL
);
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
)
66 si_meminfo_node(&i
, nid
);
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",
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
)));
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",
101 nid
, K(i
.totalram
- i
.totalhigh
),
102 nid
, K(i
.freeram
- i
.freehigh
));
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"
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
) *
132 nid
, K(node_page_state(nid
, NR_ANON_PAGES
)),
134 nid
, K(node_page_state(nid
, NR_SHMEM
)),
135 nid
, node_page_state(nid
, NR_KERNEL_STACK
) *
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
))
147 K(node_page_state(nid
, NR_ANON_TRANSPARENT_HUGEPAGES
) *
150 nid
, K(node_page_state(nid
, NR_SLAB_UNRECLAIMABLE
)));
152 n
+= hugetlb_report_node_meminfo(nid
, buf
+ n
);
157 static DEVICE_ATTR(meminfo
, S_IRUGO
, node_read_meminfo
, NULL
);
159 static ssize_t
node_read_numastat(struct device
*dev
,
160 struct device_attribute
*attr
, char *buf
)
166 "interleave_hit %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
));
176 static DEVICE_ATTR(numastat
, S_IRUGO
, node_read_numastat
, NULL
);
178 static ssize_t
node_read_vmstat(struct device
*dev
,
179 struct device_attribute
*attr
, char *buf
)
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
));
191 static DEVICE_ATTR(vmstat
, S_IRUGO
, node_read_vmstat
, NULL
);
193 static ssize_t
node_read_distance(struct device
*dev
,
194 struct device_attribute
*attr
, char * buf
)
201 * buf is currently PAGE_SIZE in length and each node needs 4 chars
202 * at the most (distance + space or newline).
204 BUILD_BUG_ON(MAX_NUMNODES
* 4 > PAGE_SIZE
);
206 for_each_online_node(i
)
207 len
+= sprintf(buf
+ len
, "%s%d", i
? " " : "", node_distance(nid
, i
));
209 len
+= sprintf(buf
+ len
, "\n");
212 static DEVICE_ATTR(distance
, S_IRUGO
, node_read_distance
, NULL
);
214 #ifdef CONFIG_HUGETLBFS
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.
224 static node_registration_func_t __hugetlb_register_node
;
225 static node_registration_func_t __hugetlb_unregister_node
;
227 static inline bool hugetlb_register_node(struct node
*node
)
229 if (__hugetlb_register_node
&&
230 node_state(node
->dev
.id
, N_MEMORY
)) {
231 __hugetlb_register_node(node
);
237 static inline void hugetlb_unregister_node(struct node
*node
)
239 if (__hugetlb_unregister_node
)
240 __hugetlb_unregister_node(node
);
243 void register_hugetlbfs_with_node(node_registration_func_t doregister
,
244 node_registration_func_t unregister
)
246 __hugetlb_register_node
= doregister
;
247 __hugetlb_unregister_node
= unregister
;
250 static inline void hugetlb_register_node(struct node
*node
) {}
252 static inline void hugetlb_unregister_node(struct node
*node
) {}
255 static void node_device_release(struct device
*dev
)
257 struct node
*node
= to_node(dev
);
259 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
261 * We schedule the work only when a memory section is
262 * onlined/offlined on this node. When we come here,
263 * all the memory on this node has been offlined,
264 * so we won't enqueue new work to this work.
266 * The work is using node->node_work, so we should
267 * flush work before freeing the memory.
269 flush_work(&node
->node_work
);
275 * register_node - Setup a sysfs device for a node.
276 * @num - Node number to use when creating the device.
278 * Initialize and register the node device.
280 static int register_node(struct node
*node
, int num
, struct node
*parent
)
285 node
->dev
.bus
= &node_subsys
;
286 node
->dev
.release
= node_device_release
;
287 error
= device_register(&node
->dev
);
290 device_create_file(&node
->dev
, &dev_attr_cpumap
);
291 device_create_file(&node
->dev
, &dev_attr_cpulist
);
292 device_create_file(&node
->dev
, &dev_attr_meminfo
);
293 device_create_file(&node
->dev
, &dev_attr_numastat
);
294 device_create_file(&node
->dev
, &dev_attr_distance
);
295 device_create_file(&node
->dev
, &dev_attr_vmstat
);
297 scan_unevictable_register_node(node
);
299 hugetlb_register_node(node
);
301 compaction_register_node(node
);
307 * unregister_node - unregister a node device
308 * @node: node going away
310 * Unregisters a node device @node. All the devices on the node must be
311 * unregistered before calling this function.
313 void unregister_node(struct node
*node
)
315 device_remove_file(&node
->dev
, &dev_attr_cpumap
);
316 device_remove_file(&node
->dev
, &dev_attr_cpulist
);
317 device_remove_file(&node
->dev
, &dev_attr_meminfo
);
318 device_remove_file(&node
->dev
, &dev_attr_numastat
);
319 device_remove_file(&node
->dev
, &dev_attr_distance
);
320 device_remove_file(&node
->dev
, &dev_attr_vmstat
);
322 scan_unevictable_unregister_node(node
);
323 hugetlb_unregister_node(node
); /* no-op, if memoryless node */
325 device_unregister(&node
->dev
);
328 struct node
*node_devices
[MAX_NUMNODES
];
331 * register cpu under node
333 int register_cpu_under_node(unsigned int cpu
, unsigned int nid
)
338 if (!node_online(nid
))
341 obj
= get_cpu_device(cpu
);
345 ret
= sysfs_create_link(&node_devices
[nid
]->dev
.kobj
,
347 kobject_name(&obj
->kobj
));
351 return sysfs_create_link(&obj
->kobj
,
352 &node_devices
[nid
]->dev
.kobj
,
353 kobject_name(&node_devices
[nid
]->dev
.kobj
));
356 int unregister_cpu_under_node(unsigned int cpu
, unsigned int nid
)
360 if (!node_online(nid
))
363 obj
= get_cpu_device(cpu
);
367 sysfs_remove_link(&node_devices
[nid
]->dev
.kobj
,
368 kobject_name(&obj
->kobj
));
369 sysfs_remove_link(&obj
->kobj
,
370 kobject_name(&node_devices
[nid
]->dev
.kobj
));
375 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
376 #define page_initialized(page) (page->lru.next)
378 static int get_nid_for_pfn(unsigned long pfn
)
382 if (!pfn_valid_within(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
++) {
407 page_nid
= get_nid_for_pfn(pfn
);
412 ret
= sysfs_create_link_nowarn(&node_devices
[nid
]->dev
.kobj
,
414 kobject_name(&mem_blk
->dev
.kobj
));
418 return sysfs_create_link_nowarn(&mem_blk
->dev
.kobj
,
419 &node_devices
[nid
]->dev
.kobj
,
420 kobject_name(&node_devices
[nid
]->dev
.kobj
));
422 /* mem section does not span the specified node */
426 /* unregister memory section under all nodes that it spans */
427 int unregister_mem_sect_under_nodes(struct memory_block
*mem_blk
,
428 unsigned long phys_index
)
430 NODEMASK_ALLOC(nodemask_t
, unlinked_nodes
, GFP_KERNEL
);
431 unsigned long pfn
, sect_start_pfn
, sect_end_pfn
;
434 NODEMASK_FREE(unlinked_nodes
);
439 nodes_clear(*unlinked_nodes
);
441 sect_start_pfn
= section_nr_to_pfn(phys_index
);
442 sect_end_pfn
= sect_start_pfn
+ PAGES_PER_SECTION
- 1;
443 for (pfn
= sect_start_pfn
; pfn
<= sect_end_pfn
; pfn
++) {
446 nid
= get_nid_for_pfn(pfn
);
449 if (!node_online(nid
))
451 if (node_test_and_set(nid
, *unlinked_nodes
))
453 sysfs_remove_link(&node_devices
[nid
]->dev
.kobj
,
454 kobject_name(&mem_blk
->dev
.kobj
));
455 sysfs_remove_link(&mem_blk
->dev
.kobj
,
456 kobject_name(&node_devices
[nid
]->dev
.kobj
));
458 NODEMASK_FREE(unlinked_nodes
);
462 static int link_mem_sections(int nid
)
464 unsigned long start_pfn
= NODE_DATA(nid
)->node_start_pfn
;
465 unsigned long end_pfn
= start_pfn
+ NODE_DATA(nid
)->node_spanned_pages
;
467 struct memory_block
*mem_blk
= NULL
;
470 for (pfn
= start_pfn
; pfn
< end_pfn
; pfn
+= PAGES_PER_SECTION
) {
471 unsigned long section_nr
= pfn_to_section_nr(pfn
);
472 struct mem_section
*mem_sect
;
475 if (!present_section_nr(section_nr
))
477 mem_sect
= __nr_to_section(section_nr
);
479 /* same memblock ? */
481 if ((section_nr
>= mem_blk
->start_section_nr
) &&
482 (section_nr
<= mem_blk
->end_section_nr
))
485 mem_blk
= find_memory_block_hinted(mem_sect
, mem_blk
);
487 ret
= register_mem_sect_under_node(mem_blk
, nid
);
491 /* discard ref obtained in find_memory_block() */
495 kobject_put(&mem_blk
->dev
.kobj
);
499 #ifdef CONFIG_HUGETLBFS
501 * Handle per node hstate attribute [un]registration on transistions
502 * to/from memoryless state.
504 static void node_hugetlb_work(struct work_struct
*work
)
506 struct node
*node
= container_of(work
, struct node
, node_work
);
509 * We only get here when a node transitions to/from memoryless state.
510 * We can detect which transition occurred by examining whether the
511 * node has memory now. hugetlb_register_node() already check this
512 * so we try to register the attributes. If that fails, then the
513 * node has transitioned to memoryless, try to unregister the
516 if (!hugetlb_register_node(node
))
517 hugetlb_unregister_node(node
);
520 static void init_node_hugetlb_work(int nid
)
522 INIT_WORK(&node_devices
[nid
]->node_work
, node_hugetlb_work
);
525 static int node_memory_callback(struct notifier_block
*self
,
526 unsigned long action
, void *arg
)
528 struct memory_notify
*mnb
= arg
;
529 int nid
= mnb
->status_change_nid
;
535 * offload per node hstate [un]registration to a work thread
536 * when transitioning to/from memoryless state.
538 if (nid
!= NUMA_NO_NODE
)
539 schedule_work(&node_devices
[nid
]->node_work
);
542 case MEM_GOING_ONLINE
:
543 case MEM_GOING_OFFLINE
:
544 case MEM_CANCEL_ONLINE
:
545 case MEM_CANCEL_OFFLINE
:
552 #endif /* CONFIG_HUGETLBFS */
553 #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */
555 static int link_mem_sections(int nid
) { return 0; }
556 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
558 #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
559 !defined(CONFIG_HUGETLBFS)
560 static inline int node_memory_callback(struct notifier_block
*self
,
561 unsigned long action
, void *arg
)
566 static void init_node_hugetlb_work(int nid
) { }
570 int register_one_node(int nid
)
575 if (node_online(nid
)) {
576 int p_node
= parent_node(nid
);
577 struct node
*parent
= NULL
;
580 parent
= node_devices
[p_node
];
582 node_devices
[nid
] = kzalloc(sizeof(struct node
), GFP_KERNEL
);
583 if (!node_devices
[nid
])
586 error
= register_node(node_devices
[nid
], nid
, parent
);
588 /* link cpu under this node */
589 for_each_present_cpu(cpu
) {
590 if (cpu_to_node(cpu
) == nid
)
591 register_cpu_under_node(cpu
, nid
);
594 /* link memory sections under this node */
595 error
= link_mem_sections(nid
);
597 /* initialize work queue for memory hot plug */
598 init_node_hugetlb_work(nid
);
605 void unregister_one_node(int nid
)
607 unregister_node(node_devices
[nid
]);
608 node_devices
[nid
] = NULL
;
612 * node states attributes
615 static ssize_t
print_nodes_state(enum node_states state
, char *buf
)
619 n
= nodelist_scnprintf(buf
, PAGE_SIZE
-2, node_states
[state
]);
626 struct device_attribute attr
;
627 enum node_states state
;
630 static ssize_t
show_node_state(struct device
*dev
,
631 struct device_attribute
*attr
, char *buf
)
633 struct node_attr
*na
= container_of(attr
, struct node_attr
, attr
);
634 return print_nodes_state(na
->state
, buf
);
637 #define _NODE_ATTR(name, state) \
638 { __ATTR(name, 0444, show_node_state, NULL), state }
640 static struct node_attr node_state_attr
[] = {
641 [N_POSSIBLE
] = _NODE_ATTR(possible
, N_POSSIBLE
),
642 [N_ONLINE
] = _NODE_ATTR(online
, N_ONLINE
),
643 [N_NORMAL_MEMORY
] = _NODE_ATTR(has_normal_memory
, N_NORMAL_MEMORY
),
644 #ifdef CONFIG_HIGHMEM
645 [N_HIGH_MEMORY
] = _NODE_ATTR(has_high_memory
, N_HIGH_MEMORY
),
647 #ifdef CONFIG_MOVABLE_NODE
648 [N_MEMORY
] = _NODE_ATTR(has_memory
, N_MEMORY
),
650 [N_CPU
] = _NODE_ATTR(has_cpu
, N_CPU
),
653 static struct attribute
*node_state_attrs
[] = {
654 &node_state_attr
[N_POSSIBLE
].attr
.attr
,
655 &node_state_attr
[N_ONLINE
].attr
.attr
,
656 &node_state_attr
[N_NORMAL_MEMORY
].attr
.attr
,
657 #ifdef CONFIG_HIGHMEM
658 &node_state_attr
[N_HIGH_MEMORY
].attr
.attr
,
660 #ifdef CONFIG_MOVABLE_NODE
661 &node_state_attr
[N_MEMORY
].attr
.attr
,
663 &node_state_attr
[N_CPU
].attr
.attr
,
667 static struct attribute_group memory_root_attr_group
= {
668 .attrs
= node_state_attrs
,
671 static const struct attribute_group
*cpu_root_attr_groups
[] = {
672 &memory_root_attr_group
,
676 #define NODE_CALLBACK_PRI 2 /* lower than SLAB */
677 static int __init
register_node_type(void)
681 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr
) != NR_NODE_STATES
);
682 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs
)-1 != NR_NODE_STATES
);
684 ret
= subsys_system_register(&node_subsys
, cpu_root_attr_groups
);
686 hotplug_memory_notifier(node_memory_callback
,
691 * Note: we're not going to unregister the node class if we fail
692 * to register the node state class attribute files.
696 postcore_initcall(register_node_type
);