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
  14 static struct sysdev_class node_class = {
  15         set_kset_name("node"),
  16 };
  17
  18
  19 static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
  20 {
  21         struct node *node_dev = to_node(dev);
  22         cpumask_t mask = node_dev->cpumap;
  23         int len;
  24
  25         /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
  26         BUILD_BUG_ON(NR_CPUS/4 > PAGE_SIZE/2);
  27
  28         len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
  29         len += sprintf(buf + len, "\n");
  30         return len;
  31 }
  32
  33 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
  34
  35 #define K(x) ((x) << (PAGE_SHIFT - 10))
  36 static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
  37 {
  38         int n;
  39         int nid = dev->id;
  40         struct sysinfo i;
  41         si_meminfo_node(&i, nid);
  42         n = sprintf(buf, "\n"
  43                        "Node %d MemTotal:     %8lu kB\n"
  44                        "Node %d MemFree:      %8lu kB\n"
  45                        "Node %d MemUsed:      %8lu kB\n"
  46                        "Node %d HighTotal:    %8lu kB\n"
  47                        "Node %d HighFree:     %8lu kB\n"
  48                        "Node %d LowTotal:     %8lu kB\n"
  49                        "Node %d LowFree:      %8lu kB\n",
  50                        nid, K(i.totalram),
  51                        nid, K(i.freeram),
  52                        nid, K(i.totalram - i.freeram),
  53                        nid, K(i.totalhigh),
  54                        nid, K(i.freehigh),
  55                        nid, K(i.totalram - i.totalhigh),
  56                        nid, K(i.freeram - i.freehigh));
  57         n += hugetlb_report_node_meminfo(nid, buf + n);
  58         return n;
  59 }
  60
  61 #undef K
  62 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
  63
  64 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
  65 {
  66         unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
  67         unsigned long local_node, other_node;
  68         int i, cpu;
  69         pg_data_t *pg = NODE_DATA(dev->id);
  70         numa_hit = 0;
  71         numa_miss = 0;
  72         interleave_hit = 0;
  73         numa_foreign = 0;
  74         local_node = 0;
  75         other_node = 0;
  76         for (i = 0; i < MAX_NR_ZONES; i++) {
  77                 struct zone *z = &pg->node_zones[i];
  78                 for (cpu = 0; cpu < NR_CPUS; cpu++) {
  79                         struct per_cpu_pageset *ps = &z->pageset[cpu];
  80                         numa_hit += ps->numa_hit;
  81                         numa_miss += ps->numa_miss;
  82                         numa_foreign += ps->numa_foreign;
  83                         interleave_hit += ps->interleave_hit;
  84                         local_node += ps->local_node;
  85                         other_node += ps->other_node;
  86                 }
  87         }
  88         return sprintf(buf,
  89                        "numa_hit %lu\n"
  90                        "numa_miss %lu\n"
  91                        "numa_foreign %lu\n"
  92                        "interleave_hit %lu\n"
  93                        "local_node %lu\n"
  94                        "other_node %lu\n",
  95                        numa_hit,
  96                        numa_miss,
  97                        numa_foreign,
  98                        interleave_hit,
  99                        local_node,
 100                        other_node);
 101 }
 102 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 103
 104 /*
 105  * register_node - Setup a driverfs device for a node.
 106  * @num - Node number to use when creating the device.
 107  *
 108  * Initialize and register the node device.
 109  */
 110 int __init register_node(struct node *node, int num, struct node *parent)
 111 {
 112         int error;
 113
 114         node->cpumap = node_to_cpumask(num);
 115         node->sysdev.id = num;
 116         node->sysdev.cls = &node_class;
 117         error = sysdev_register(&node->sysdev);
 118
 119         if (!error){
 120                 sysdev_create_file(&node->sysdev, &attr_cpumap);
 121                 sysdev_create_file(&node->sysdev, &attr_meminfo);
 122                 sysdev_create_file(&node->sysdev, &attr_numastat);
 123         }
 124         return error;
 125 }
 126
 127
 128 int __init register_node_type(void)
 129 {
 130         return sysdev_class_register(&node_class);
 131 }
 132 postcore_initcall(register_node_type);