projects/linux·blob v2.6.18 · refs

235 lines · 6.1 KiB

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>
14#include <linux/cpu.h>
15
16static struct sysdev_class node_class = {
17 set_kset_name("node"),
18};
19
20
21static 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
35static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
36
37#define K(x) ((x) << (PAGE_SHIFT - 10))
38static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
39{
40 int n;
41 int nid = dev->id;
42 struct sysinfo i;
43 unsigned long inactive;
44 unsigned long active;
45 unsigned long free;
46
47 si_meminfo_node(&i, nid);
48 __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
49
50
51 n = sprintf(buf, "\n"
52 "Node %d MemTotal: %8lu kB\n"
53 "Node %d MemFree: %8lu kB\n"
54 "Node %d MemUsed: %8lu kB\n"
55 "Node %d Active: %8lu kB\n"
56 "Node %d Inactive: %8lu kB\n"
57 "Node %d HighTotal: %8lu kB\n"
58 "Node %d HighFree: %8lu kB\n"
59 "Node %d LowTotal: %8lu kB\n"
60 "Node %d LowFree: %8lu kB\n"
61 "Node %d Dirty: %8lu kB\n"
62 "Node %d Writeback: %8lu kB\n"
63 "Node %d FilePages: %8lu kB\n"
64 "Node %d Mapped: %8lu kB\n"
65 "Node %d AnonPages: %8lu kB\n"
66 "Node %d PageTables: %8lu kB\n"
67 "Node %d NFS_Unstable: %8lu kB\n"
68 "Node %d Bounce: %8lu kB\n"
69 "Node %d Slab: %8lu kB\n",
70 nid, K(i.totalram),
71 nid, K(i.freeram),
72 nid, K(i.totalram - i.freeram),
73 nid, K(active),
74 nid, K(inactive),
75 nid, K(i.totalhigh),
76 nid, K(i.freehigh),
77 nid, K(i.totalram - i.totalhigh),
78 nid, K(i.freeram - i.freehigh),
79 nid, K(node_page_state(nid, NR_FILE_DIRTY)),
80 nid, K(node_page_state(nid, NR_WRITEBACK)),
81 nid, K(node_page_state(nid, NR_FILE_PAGES)),
82 nid, K(node_page_state(nid, NR_FILE_MAPPED)),
83 nid, K(node_page_state(nid, NR_ANON_PAGES)),
84 nid, K(node_page_state(nid, NR_PAGETABLE)),
85 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
86 nid, K(node_page_state(nid, NR_BOUNCE)),
87 nid, K(node_page_state(nid, NR_SLAB)));
88 n += hugetlb_report_node_meminfo(nid, buf + n);
89 return n;
90}
91
92#undef K
93static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
94
95static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
96{
97 return sprintf(buf,
98 "numa_hit %lu\n"
99 "numa_miss %lu\n"
100 "numa_foreign %lu\n"
101 "interleave_hit %lu\n"
102 "local_node %lu\n"
103 "other_node %lu\n",
104 node_page_state(dev->id, NUMA_HIT),
105 node_page_state(dev->id, NUMA_MISS),
106 node_page_state(dev->id, NUMA_FOREIGN),
107 node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
108 node_page_state(dev->id, NUMA_LOCAL),
109 node_page_state(dev->id, NUMA_OTHER));
110}
111static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
112
113static ssize_t node_read_distance(struct sys_device * dev, char * buf)
114{
115 int nid = dev->id;
116 int len = 0;
117 int i;
118
119 /* buf currently PAGE_SIZE, need ~4 chars per node */
120 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
121
122 for_each_online_node(i)
123 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
124
125 len += sprintf(buf + len, "\n");
126 return len;
127}
128static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
129
130
131/*
132 * register_node - Setup a driverfs device for a node.
133 * @num - Node number to use when creating the device.
134 *
135 * Initialize and register the node device.
136 */
137int register_node(struct node *node, int num, struct node *parent)
138{
139 int error;
140
141 node->sysdev.id = num;
142 node->sysdev.cls = &node_class;
143 error = sysdev_register(&node->sysdev);
144
145 if (!error){
146 sysdev_create_file(&node->sysdev, &attr_cpumap);
147 sysdev_create_file(&node->sysdev, &attr_meminfo);
148 sysdev_create_file(&node->sysdev, &attr_numastat);
149 sysdev_create_file(&node->sysdev, &attr_distance);
150 }
151 return error;
152}
153
154/**
155 * unregister_node - unregister a node device
156 * @node: node going away
157 *
158 * Unregisters a node device @node. All the devices on the node must be
159 * unregistered before calling this function.
160 */
161void unregister_node(struct node *node)
162{
163 sysdev_remove_file(&node->sysdev, &attr_cpumap);
164 sysdev_remove_file(&node->sysdev, &attr_meminfo);
165 sysdev_remove_file(&node->sysdev, &attr_numastat);
166 sysdev_remove_file(&node->sysdev, &attr_distance);
167
168 sysdev_unregister(&node->sysdev);
169}
170
171struct node node_devices[MAX_NUMNODES];
172
173/*
174 * register cpu under node
175 */
176int register_cpu_under_node(unsigned int cpu, unsigned int nid)
177{
178 if (node_online(nid)) {
179 struct sys_device *obj = get_cpu_sysdev(cpu);
180 if (!obj)
181 return 0;
182 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
183 &obj->kobj,
184 kobject_name(&obj->kobj));
185 }
186
187 return 0;
188}
189
190int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
191{
192 if (node_online(nid)) {
193 struct sys_device *obj = get_cpu_sysdev(cpu);
194 if (obj)
195 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
196 kobject_name(&obj->kobj));
197 }
198 return 0;
199}
200
201int register_one_node(int nid)
202{
203 int error = 0;
204 int cpu;
205
206 if (node_online(nid)) {
207 int p_node = parent_node(nid);
208 struct node *parent = NULL;
209
210 if (p_node != nid)
211 parent = &node_devices[p_node];
212
213 error = register_node(&node_devices[nid], nid, parent);
214
215 /* link cpu under this node */
216 for_each_present_cpu(cpu) {
217 if (cpu_to_node(cpu) == nid)
218 register_cpu_under_node(cpu, nid);
219 }
220 }
221
222 return error;
223
224}
225
226void unregister_one_node(int nid)
227{
228 unregister_node(&node_devices[nid]);
229}
230
231static int __init register_node_type(void)
232{
233 return sysdev_class_register(&node_class);
234}
235postcore_initcall(register_node_type);