projects/linux·blob v2.6.14 · refs

197 lines · 5.2 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
15static struct sysdev_class node_class = {
16 set_kset_name("node"),
17};
18
19
20static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
21{
22 struct node *node_dev = to_node(dev);
23 cpumask_t mask = node_to_cpumask(node_dev->sysdev.id);
24 int len;
25
26 /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
27 BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
28
29 len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
30 len += sprintf(buf + len, "\n");
31 return len;
32}
33
34static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
35
36#define K(x) ((x) << (PAGE_SHIFT - 10))
37static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
38{
39 int n;
40 int nid = dev->id;
41 struct sysinfo i;
42 struct page_state ps;
43 unsigned long inactive;
44 unsigned long active;
45 unsigned long free;
46
47 si_meminfo_node(&i, nid);
48 get_page_state_node(&ps, nid);
49 __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
50
51 /* Check for negative values in these approximate counters */
52 if ((long)ps.nr_dirty < 0)
53 ps.nr_dirty = 0;
54 if ((long)ps.nr_writeback < 0)
55 ps.nr_writeback = 0;
56 if ((long)ps.nr_mapped < 0)
57 ps.nr_mapped = 0;
58 if ((long)ps.nr_slab < 0)
59 ps.nr_slab = 0;
60
61 n = sprintf(buf, "\n"
62 "Node %d MemTotal: %8lu kB\n"
63 "Node %d MemFree: %8lu kB\n"
64 "Node %d MemUsed: %8lu kB\n"
65 "Node %d Active: %8lu kB\n"
66 "Node %d Inactive: %8lu kB\n"
67 "Node %d HighTotal: %8lu kB\n"
68 "Node %d HighFree: %8lu kB\n"
69 "Node %d LowTotal: %8lu kB\n"
70 "Node %d LowFree: %8lu kB\n"
71 "Node %d Dirty: %8lu kB\n"
72 "Node %d Writeback: %8lu kB\n"
73 "Node %d Mapped: %8lu kB\n"
74 "Node %d Slab: %8lu kB\n",
75 nid, K(i.totalram),
76 nid, K(i.freeram),
77 nid, K(i.totalram - i.freeram),
78 nid, K(active),
79 nid, K(inactive),
80 nid, K(i.totalhigh),
81 nid, K(i.freehigh),
82 nid, K(i.totalram - i.totalhigh),
83 nid, K(i.freeram - i.freehigh),
84 nid, K(ps.nr_dirty),
85 nid, K(ps.nr_writeback),
86 nid, K(ps.nr_mapped),
87 nid, K(ps.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 unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
98 unsigned long local_node, other_node;
99 int i, cpu;
100 pg_data_t *pg = NODE_DATA(dev->id);
101 numa_hit = 0;
102 numa_miss = 0;
103 interleave_hit = 0;
104 numa_foreign = 0;
105 local_node = 0;
106 other_node = 0;
107 for (i = 0; i < MAX_NR_ZONES; i++) {
108 struct zone *z = &pg->node_zones[i];
109 for (cpu = 0; cpu < NR_CPUS; cpu++) {
110 struct per_cpu_pageset *ps = zone_pcp(z,cpu);
111 numa_hit += ps->numa_hit;
112 numa_miss += ps->numa_miss;
113 numa_foreign += ps->numa_foreign;
114 interleave_hit += ps->interleave_hit;
115 local_node += ps->local_node;
116 other_node += ps->other_node;
117 }
118 }
119 return sprintf(buf,
120 "numa_hit %lu\n"
121 "numa_miss %lu\n"
122 "numa_foreign %lu\n"
123 "interleave_hit %lu\n"
124 "local_node %lu\n"
125 "other_node %lu\n",
126 numa_hit,
127 numa_miss,
128 numa_foreign,
129 interleave_hit,
130 local_node,
131 other_node);
132}
133static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
134
135static ssize_t node_read_distance(struct sys_device * dev, char * buf)
136{
137 int nid = dev->id;
138 int len = 0;
139 int i;
140
141 /* buf currently PAGE_SIZE, need ~4 chars per node */
142 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
143
144 for_each_online_node(i)
145 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
146
147 len += sprintf(buf + len, "\n");
148 return len;
149}
150static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
151
152
153/*
154 * register_node - Setup a driverfs device for a node.
155 * @num - Node number to use when creating the device.
156 *
157 * Initialize and register the node device.
158 */
159int register_node(struct node *node, int num, struct node *parent)
160{
161 int error;
162
163 node->sysdev.id = num;
164 node->sysdev.cls = &node_class;
165 error = sysdev_register(&node->sysdev);
166
167 if (!error){
168 sysdev_create_file(&node->sysdev, &attr_cpumap);
169 sysdev_create_file(&node->sysdev, &attr_meminfo);
170 sysdev_create_file(&node->sysdev, &attr_numastat);
171 sysdev_create_file(&node->sysdev, &attr_distance);
172 }
173 return error;
174}
175
176/**
177 * unregister_node - unregister a node device
178 * @node: node going away
179 *
180 * Unregisters a node device @node. All the devices on the node must be
181 * unregistered before calling this function.
182 */
183void unregister_node(struct node *node)
184{
185 sysdev_remove_file(&node->sysdev, &attr_cpumap);
186 sysdev_remove_file(&node->sysdev, &attr_meminfo);
187 sysdev_remove_file(&node->sysdev, &attr_numastat);
188 sysdev_remove_file(&node->sysdev, &attr_distance);
189
190 sysdev_unregister(&node->sysdev);
191}
192
193static int __init register_node_type(void)
194{
195 return sysdev_class_register(&node_class);
196}
197postcore_initcall(register_node_type);