[PATCH] zoned vm counters: conversion of nr_pagetables to per zone counter
[linux-2.6.git] / drivers / base / node.c
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
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;
43         struct page_state ps;
44         unsigned long inactive;
45         unsigned long active;
46         unsigned long free;
47
48         si_meminfo_node(&i, nid);
49         get_page_state_node(&ps, nid);
50         __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
51
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;
57
58         n = sprintf(buf, "\n"
59                        "Node %d MemTotal:     %8lu kB\n"
60                        "Node %d MemFree:      %8lu kB\n"
61                        "Node %d MemUsed:      %8lu kB\n"
62                        "Node %d Active:       %8lu kB\n"
63                        "Node %d Inactive:     %8lu kB\n"
64                        "Node %d HighTotal:    %8lu kB\n"
65                        "Node %d HighFree:     %8lu kB\n"
66                        "Node %d LowTotal:     %8lu kB\n"
67                        "Node %d LowFree:      %8lu kB\n"
68                        "Node %d Dirty:        %8lu kB\n"
69                        "Node %d Writeback:    %8lu kB\n"
70                        "Node %d FilePages:    %8lu kB\n"
71                        "Node %d Mapped:       %8lu kB\n"
72                        "Node %d AnonPages:    %8lu kB\n"
73                        "Node %d PageTables:   %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(node_page_state(nid, NR_FILE_PAGES)),
87                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
88                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
89                        nid, K(node_page_state(nid, NR_PAGETABLE)),
90                        nid, K(node_page_state(nid, NR_SLAB)));
91         n += hugetlb_report_node_meminfo(nid, buf + n);
92         return n;
93 }
94
95 #undef K
96 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
97
98 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
99 {
100         unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
101         unsigned long local_node, other_node;
102         int i, cpu;
103         pg_data_t *pg = NODE_DATA(dev->id);
104         numa_hit = 0;
105         numa_miss = 0;
106         interleave_hit = 0;
107         numa_foreign = 0;
108         local_node = 0;
109         other_node = 0;
110         for (i = 0; i < MAX_NR_ZONES; i++) {
111                 struct zone *z = &pg->node_zones[i];
112                 for_each_online_cpu(cpu) {
113                         struct per_cpu_pageset *ps = zone_pcp(z,cpu);
114                         numa_hit += ps->numa_hit;
115                         numa_miss += ps->numa_miss;
116                         numa_foreign += ps->numa_foreign;
117                         interleave_hit += ps->interleave_hit;
118                         local_node += ps->local_node;
119                         other_node += ps->other_node;
120                 }
121         }
122         return sprintf(buf,
123                        "numa_hit %lu\n"
124                        "numa_miss %lu\n"
125                        "numa_foreign %lu\n"
126                        "interleave_hit %lu\n"
127                        "local_node %lu\n"
128                        "other_node %lu\n",
129                        numa_hit,
130                        numa_miss,
131                        numa_foreign,
132                        interleave_hit,
133                        local_node,
134                        other_node);
135 }
136 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
137
138 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
139 {
140         int nid = dev->id;
141         int len = 0;
142         int i;
143
144         /* buf currently PAGE_SIZE, need ~4 chars per node */
145         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
146
147         for_each_online_node(i)
148                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
149
150         len += sprintf(buf + len, "\n");
151         return len;
152 }
153 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
154
155
156 /*
157  * register_node - Setup a driverfs device for a node.
158  * @num - Node number to use when creating the device.
159  *
160  * Initialize and register the node device.
161  */
162 int register_node(struct node *node, int num, struct node *parent)
163 {
164         int error;
165
166         node->sysdev.id = num;
167         node->sysdev.cls = &node_class;
168         error = sysdev_register(&node->sysdev);
169
170         if (!error){
171                 sysdev_create_file(&node->sysdev, &attr_cpumap);
172                 sysdev_create_file(&node->sysdev, &attr_meminfo);
173                 sysdev_create_file(&node->sysdev, &attr_numastat);
174                 sysdev_create_file(&node->sysdev, &attr_distance);
175         }
176         return error;
177 }
178
179 /**
180  * unregister_node - unregister a node device
181  * @node: node going away
182  *
183  * Unregisters a node device @node.  All the devices on the node must be
184  * unregistered before calling this function.
185  */
186 void unregister_node(struct node *node)
187 {
188         sysdev_remove_file(&node->sysdev, &attr_cpumap);
189         sysdev_remove_file(&node->sysdev, &attr_meminfo);
190         sysdev_remove_file(&node->sysdev, &attr_numastat);
191         sysdev_remove_file(&node->sysdev, &attr_distance);
192
193         sysdev_unregister(&node->sysdev);
194 }
195
196 struct node node_devices[MAX_NUMNODES];
197
198 /*
199  * register cpu under node
200  */
201 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
202 {
203         if (node_online(nid)) {
204                 struct sys_device *obj = get_cpu_sysdev(cpu);
205                 if (!obj)
206                         return 0;
207                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
208                                          &obj->kobj,
209                                          kobject_name(&obj->kobj));
210          }
211
212         return 0;
213 }
214
215 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
216 {
217         if (node_online(nid)) {
218                 struct sys_device *obj = get_cpu_sysdev(cpu);
219                 if (obj)
220                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
221                                          kobject_name(&obj->kobj));
222         }
223         return 0;
224 }
225
226 int register_one_node(int nid)
227 {
228         int error = 0;
229         int cpu;
230
231         if (node_online(nid)) {
232                 int p_node = parent_node(nid);
233                 struct node *parent = NULL;
234
235                 if (p_node != nid)
236                         parent = &node_devices[p_node];
237
238                 error = register_node(&node_devices[nid], nid, parent);
239
240                 /* link cpu under this node */
241                 for_each_present_cpu(cpu) {
242                         if (cpu_to_node(cpu) == nid)
243                                 register_cpu_under_node(cpu, nid);
244                 }
245         }
246
247         return error;
248
249 }
250
251 void unregister_one_node(int nid)
252 {
253         unregister_node(&node_devices[nid]);
254 }
255
256 static int __init register_node_type(void)
257 {
258         return sysdev_class_register(&node_class);
259 }
260 postcore_initcall(register_node_type);