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
  15 static struct sysdev_class node_class = {
  16         set_kset_name("node"),
  17 };
  18
  19
  20 static 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
  34 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
  35
  36 #define K(x) ((x) << (PAGE_SHIFT - 10))
  37 static 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         unsigned long inactive;
  43         unsigned long active;
  44         unsigned long free;
  45
  46         si_meminfo_node(&i, nid);
  47         __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
  48
  49         n = sprintf(buf, "\n"
  50                        "Node %d MemTotal:     %8lu kB\n"
  51                        "Node %d MemFree:      %8lu kB\n"
  52                        "Node %d MemUsed:      %8lu kB\n"
  53                        "Node %d Active:       %8lu kB\n"
  54                        "Node %d Inactive:     %8lu kB\n"
  55                        "Node %d HighTotal:    %8lu kB\n"
  56                        "Node %d HighFree:     %8lu kB\n"
  57                        "Node %d LowTotal:     %8lu kB\n"
  58                        "Node %d LowFree:      %8lu kB\n",
  59                        nid, K(i.totalram),
  60                        nid, K(i.freeram),
  61                        nid, K(i.totalram - i.freeram),
  62                        nid, K(active),
  63                        nid, K(inactive),
  64                        nid, K(i.totalhigh),
  65                        nid, K(i.freehigh),
  66                        nid, K(i.totalram - i.totalhigh),
  67                        nid, K(i.freeram - i.freehigh));
  68         n += hugetlb_report_node_meminfo(nid, buf + n);
  69         return n;
  70 }
  71
  72 #undef K
  73 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
  74
  75 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
  76 {
  77         unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
  78         unsigned long local_node, other_node;
  79         int i, cpu;
  80         pg_data_t *pg = NODE_DATA(dev->id);
  81         numa_hit = 0;
  82         numa_miss = 0;
  83         interleave_hit = 0;
  84         numa_foreign = 0;
  85         local_node = 0;
  86         other_node = 0;
  87         for (i = 0; i < MAX_NR_ZONES; i++) {
  88                 struct zone *z = &pg->node_zones[i];
  89                 for (cpu = 0; cpu < NR_CPUS; cpu++) {
  90                         struct per_cpu_pageset *ps = &z->pageset[cpu];
  91                         numa_hit += ps->numa_hit;
  92                         numa_miss += ps->numa_miss;
  93                         numa_foreign += ps->numa_foreign;
  94                         interleave_hit += ps->interleave_hit;
  95                         local_node += ps->local_node;
  96                         other_node += ps->other_node;
  97                 }
  98         }
  99         return sprintf(buf,
 100                        "numa_hit %lu\n"
 101                        "numa_miss %lu\n"
 102                        "numa_foreign %lu\n"
 103                        "interleave_hit %lu\n"
 104                        "local_node %lu\n"
 105                        "other_node %lu\n",
 106                        numa_hit,
 107                        numa_miss,
 108                        numa_foreign,
 109                        interleave_hit,
 110                        local_node,
 111                        other_node);
 112 }
 113 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 114
 115 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
 116 {
 117         int nid = dev->id;
 118         int len = 0;
 119         int i;
 120
 121         /* buf currently PAGE_SIZE, need ~4 chars per node */
 122         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
 123
 124         for_each_online_node(i)
 125                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
 126
 127         len += sprintf(buf + len, "\n");
 128         return len;
 129 }
 130 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
 131
 132
 133 /*
 134  * register_node - Setup a driverfs device for a node.
 135  * @num - Node number to use when creating the device.
 136  *
 137  * Initialize and register the node device.
 138  */
 139 int __init register_node(struct node *node, int num, struct node *parent)
 140 {
 141         int error;
 142
 143         node->sysdev.id = num;
 144         node->sysdev.cls = &node_class;
 145         error = sysdev_register(&node->sysdev);
 146
 147         if (!error){
 148                 sysdev_create_file(&node->sysdev, &attr_cpumap);
 149                 sysdev_create_file(&node->sysdev, &attr_meminfo);
 150                 sysdev_create_file(&node->sysdev, &attr_numastat);
 151                 sysdev_create_file(&node->sysdev, &attr_distance);
 152         }
 153         return error;
 154 }
 155
 156
 157 int __init register_node_type(void)
 158 {
 159         return sysdev_class_register(&node_class);
 160 }
 161 postcore_initcall(register_node_type);