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Commit | Line | Data |
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1da177e4 LT |
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/node.h> | |
10 | #include <linux/hugetlb.h> | |
11 | #include <linux/cpumask.h> | |
12 | #include <linux/topology.h> | |
13 | #include <linux/nodemask.h> | |
76b67ed9 | 14 | #include <linux/cpu.h> |
1da177e4 LT |
15 | |
16 | static struct sysdev_class node_class = { | |
17 | set_kset_name("node"), | |
18 | }; | |
19 | ||
20 | ||
21 | static ssize_t node_read_cpumap(struct sys_device * dev, char * buf) | |
22 | { | |
23 | struct node *node_dev = to_node(dev); | |
24 | cpumask_t mask = node_to_cpumask(node_dev->sysdev.id); | |
25 | int len; | |
26 | ||
27 | /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */ | |
28 | BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2); | |
29 | ||
30 | len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask); | |
31 | len += sprintf(buf + len, "\n"); | |
32 | return len; | |
33 | } | |
34 | ||
35 | static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL); | |
36 | ||
37 | #define K(x) ((x) << (PAGE_SHIFT - 10)) | |
38 | static ssize_t node_read_meminfo(struct sys_device * dev, char * buf) | |
39 | { | |
40 | int n; | |
41 | int nid = dev->id; | |
42 | struct sysinfo i; | |
c07e02db | 43 | struct page_state ps; |
1da177e4 LT |
44 | unsigned long inactive; |
45 | unsigned long active; | |
46 | unsigned long free; | |
47 | ||
48 | si_meminfo_node(&i, nid); | |
c07e02db | 49 | get_page_state_node(&ps, nid); |
1da177e4 LT |
50 | __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid)); |
51 | ||
c07e02db MH |
52 | /* Check for negative values in these approximate counters */ |
53 | if ((long)ps.nr_dirty < 0) | |
54 | ps.nr_dirty = 0; | |
55 | if ((long)ps.nr_writeback < 0) | |
56 | ps.nr_writeback = 0; | |
c07e02db MH |
57 | if ((long)ps.nr_slab < 0) |
58 | ps.nr_slab = 0; | |
59 | ||
1da177e4 LT |
60 | n = sprintf(buf, "\n" |
61 | "Node %d MemTotal: %8lu kB\n" | |
62 | "Node %d MemFree: %8lu kB\n" | |
63 | "Node %d MemUsed: %8lu kB\n" | |
64 | "Node %d Active: %8lu kB\n" | |
65 | "Node %d Inactive: %8lu kB\n" | |
66 | "Node %d HighTotal: %8lu kB\n" | |
67 | "Node %d HighFree: %8lu kB\n" | |
68 | "Node %d LowTotal: %8lu kB\n" | |
c07e02db MH |
69 | "Node %d LowFree: %8lu kB\n" |
70 | "Node %d Dirty: %8lu kB\n" | |
71 | "Node %d Writeback: %8lu kB\n" | |
72 | "Node %d Mapped: %8lu kB\n" | |
73 | "Node %d Slab: %8lu kB\n", | |
1da177e4 LT |
74 | nid, K(i.totalram), |
75 | nid, K(i.freeram), | |
76 | nid, K(i.totalram - i.freeram), | |
77 | nid, K(active), | |
78 | nid, K(inactive), | |
79 | nid, K(i.totalhigh), | |
80 | nid, K(i.freehigh), | |
81 | nid, K(i.totalram - i.totalhigh), | |
c07e02db MH |
82 | nid, K(i.freeram - i.freehigh), |
83 | nid, K(ps.nr_dirty), | |
84 | nid, K(ps.nr_writeback), | |
65ba55f5 | 85 | nid, K(node_page_state(nid, NR_FILE_MAPPED)), |
c07e02db | 86 | nid, K(ps.nr_slab)); |
1da177e4 LT |
87 | n += hugetlb_report_node_meminfo(nid, buf + n); |
88 | return n; | |
89 | } | |
90 | ||
91 | #undef K | |
92 | static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); | |
93 | ||
94 | static ssize_t node_read_numastat(struct sys_device * dev, char * buf) | |
95 | { | |
96 | unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign; | |
97 | unsigned long local_node, other_node; | |
98 | int i, cpu; | |
99 | pg_data_t *pg = NODE_DATA(dev->id); | |
100 | numa_hit = 0; | |
101 | numa_miss = 0; | |
102 | interleave_hit = 0; | |
103 | numa_foreign = 0; | |
104 | local_node = 0; | |
105 | other_node = 0; | |
106 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
107 | struct zone *z = &pg->node_zones[i]; | |
54404e72 | 108 | for_each_online_cpu(cpu) { |
e7c8d5c9 | 109 | struct per_cpu_pageset *ps = zone_pcp(z,cpu); |
1da177e4 LT |
110 | numa_hit += ps->numa_hit; |
111 | numa_miss += ps->numa_miss; | |
112 | numa_foreign += ps->numa_foreign; | |
113 | interleave_hit += ps->interleave_hit; | |
114 | local_node += ps->local_node; | |
115 | other_node += ps->other_node; | |
116 | } | |
117 | } | |
118 | return sprintf(buf, | |
119 | "numa_hit %lu\n" | |
120 | "numa_miss %lu\n" | |
121 | "numa_foreign %lu\n" | |
122 | "interleave_hit %lu\n" | |
123 | "local_node %lu\n" | |
124 | "other_node %lu\n", | |
125 | numa_hit, | |
126 | numa_miss, | |
127 | numa_foreign, | |
128 | interleave_hit, | |
129 | local_node, | |
130 | other_node); | |
131 | } | |
132 | static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); | |
133 | ||
134 | static ssize_t node_read_distance(struct sys_device * dev, char * buf) | |
135 | { | |
136 | int nid = dev->id; | |
137 | int len = 0; | |
138 | int i; | |
139 | ||
140 | /* buf currently PAGE_SIZE, need ~4 chars per node */ | |
141 | BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2); | |
142 | ||
143 | for_each_online_node(i) | |
144 | len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); | |
145 | ||
146 | len += sprintf(buf + len, "\n"); | |
147 | return len; | |
148 | } | |
149 | static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL); | |
150 | ||
151 | ||
152 | /* | |
153 | * register_node - Setup a driverfs device for a node. | |
154 | * @num - Node number to use when creating the device. | |
155 | * | |
156 | * Initialize and register the node device. | |
157 | */ | |
4b45099b | 158 | int register_node(struct node *node, int num, struct node *parent) |
1da177e4 LT |
159 | { |
160 | int error; | |
161 | ||
162 | node->sysdev.id = num; | |
163 | node->sysdev.cls = &node_class; | |
164 | error = sysdev_register(&node->sysdev); | |
165 | ||
166 | if (!error){ | |
167 | sysdev_create_file(&node->sysdev, &attr_cpumap); | |
168 | sysdev_create_file(&node->sysdev, &attr_meminfo); | |
169 | sysdev_create_file(&node->sysdev, &attr_numastat); | |
170 | sysdev_create_file(&node->sysdev, &attr_distance); | |
171 | } | |
172 | return error; | |
173 | } | |
174 | ||
4b45099b KT |
175 | /** |
176 | * unregister_node - unregister a node device | |
177 | * @node: node going away | |
178 | * | |
179 | * Unregisters a node device @node. All the devices on the node must be | |
180 | * unregistered before calling this function. | |
181 | */ | |
182 | void unregister_node(struct node *node) | |
183 | { | |
184 | sysdev_remove_file(&node->sysdev, &attr_cpumap); | |
185 | sysdev_remove_file(&node->sysdev, &attr_meminfo); | |
186 | sysdev_remove_file(&node->sysdev, &attr_numastat); | |
187 | sysdev_remove_file(&node->sysdev, &attr_distance); | |
188 | ||
189 | sysdev_unregister(&node->sysdev); | |
190 | } | |
1da177e4 | 191 | |
0fc44159 YG |
192 | struct node node_devices[MAX_NUMNODES]; |
193 | ||
76b67ed9 KH |
194 | /* |
195 | * register cpu under node | |
196 | */ | |
197 | int register_cpu_under_node(unsigned int cpu, unsigned int nid) | |
198 | { | |
199 | if (node_online(nid)) { | |
200 | struct sys_device *obj = get_cpu_sysdev(cpu); | |
201 | if (!obj) | |
202 | return 0; | |
203 | return sysfs_create_link(&node_devices[nid].sysdev.kobj, | |
204 | &obj->kobj, | |
205 | kobject_name(&obj->kobj)); | |
206 | } | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) | |
212 | { | |
213 | if (node_online(nid)) { | |
214 | struct sys_device *obj = get_cpu_sysdev(cpu); | |
215 | if (obj) | |
216 | sysfs_remove_link(&node_devices[nid].sysdev.kobj, | |
217 | kobject_name(&obj->kobj)); | |
218 | } | |
219 | return 0; | |
220 | } | |
221 | ||
0fc44159 YG |
222 | int register_one_node(int nid) |
223 | { | |
224 | int error = 0; | |
76b67ed9 | 225 | int cpu; |
0fc44159 YG |
226 | |
227 | if (node_online(nid)) { | |
228 | int p_node = parent_node(nid); | |
229 | struct node *parent = NULL; | |
230 | ||
231 | if (p_node != nid) | |
232 | parent = &node_devices[p_node]; | |
233 | ||
234 | error = register_node(&node_devices[nid], nid, parent); | |
76b67ed9 KH |
235 | |
236 | /* link cpu under this node */ | |
237 | for_each_present_cpu(cpu) { | |
238 | if (cpu_to_node(cpu) == nid) | |
239 | register_cpu_under_node(cpu, nid); | |
240 | } | |
0fc44159 YG |
241 | } |
242 | ||
243 | return error; | |
244 | ||
245 | } | |
246 | ||
247 | void unregister_one_node(int nid) | |
248 | { | |
249 | unregister_node(&node_devices[nid]); | |
250 | } | |
251 | ||
4b45099b | 252 | static int __init register_node_type(void) |
1da177e4 LT |
253 | { |
254 | return sysdev_class_register(&node_class); | |
255 | } | |
256 | postcore_initcall(register_node_type); |