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