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/cpumask.h>
  11 #include <linux/topology.h>
  12
  13 static struct sysdev_class node_class = {
  14         set_kset_name("node"),
  15 };
  16
  17
  18 static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
  19 {
  20         struct node *node_dev = to_node(dev);
  21         cpumask_t mask = node_dev->cpumap;
  22         int len;
  23
  24         /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
  25         BUILD_BUG_ON(NR_CPUS/4 > PAGE_SIZE/2);
  26
  27         len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
  28         len += sprintf(buf + len, "\n");
  29         return len;
  30 }
  31
  32 static SYSDEV_ATTR(cpumap,S_IRUGO,node_read_cpumap,NULL);
  33
  34 /* Can be overwritten by architecture specific code. */
  35 int __attribute__((weak)) hugetlb_report_node_meminfo(int node, char *buf)
  36 {
  37         return 0;
  38 }
  39
  40 #define K(x) ((x) << (PAGE_SHIFT - 10))
  41 static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
  42 {
  43         int n;
  44         int nid = dev->id;
  45         struct sysinfo i;
  46         si_meminfo_node(&i, nid);
  47         n = sprintf(buf, "\n"
  48                        "Node %d MemTotal:     %8lu kB\n"
  49                        "Node %d MemFree:      %8lu kB\n"
  50                        "Node %d MemUsed:      %8lu kB\n"
  51                        "Node %d HighTotal:    %8lu kB\n"
  52                        "Node %d HighFree:     %8lu kB\n"
  53                        "Node %d LowTotal:     %8lu kB\n"
  54                        "Node %d LowFree:      %8lu kB\n",
  55                        nid, K(i.totalram),
  56                        nid, K(i.freeram),
  57                        nid, K(i.totalram-i.freeram),
  58                        nid, K(i.totalhigh),
  59                        nid, K(i.freehigh),
  60                        nid, K(i.totalram-i.totalhigh),
  61                        nid, K(i.freeram-i.freehigh));
  62         n += hugetlb_report_node_meminfo(nid, buf + n);
  63         return n;
  64 }
  65
  66 #undef K
  67 static SYSDEV_ATTR(meminfo,S_IRUGO,node_read_meminfo,NULL);
  68
  69 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
  70 {
  71         unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
  72         unsigned long local_node, other_node;
  73         int i, cpu;
  74         pg_data_t *pg = NODE_DATA(dev->id);
  75         numa_hit = 0;
  76         numa_miss = 0;
  77         interleave_hit = 0;
  78         numa_foreign = 0;
  79         local_node = 0;
  80         other_node = 0;
  81         for (i = 0; i < MAX_NR_ZONES; i++) {
  82                 struct zone *z = &pg->node_zones[i];
  83                 for (cpu = 0; cpu < NR_CPUS; cpu++) {
  84                         struct per_cpu_pageset *ps = &z->pageset[cpu];
  85                         numa_hit += ps->numa_hit;
  86                         numa_miss += ps->numa_miss;
  87                         numa_foreign += ps->numa_foreign;
  88                         interleave_hit += ps->interleave_hit;
  89                         local_node += ps->local_node;
  90                         other_node += ps->other_node;
  91                 }
  92         }
  93         return sprintf(buf,
  94                        "numa_hit %lu\n"
  95                        "numa_miss %lu\n"
  96                        "numa_foreign %lu\n"
  97                        "interleave_hit %lu\n"
  98                        "local_node %lu\n"
  99                        "other_node %lu\n",
 100                        numa_hit,
 101                        numa_miss,
 102                        numa_foreign,
 103                        interleave_hit,
 104                        local_node,
 105                        other_node);
 106 }
 107 static SYSDEV_ATTR(numastat,S_IRUGO,node_read_numastat,NULL);
 108
 109 /*
 110  * register_node - Setup a driverfs device for a node.
 111  * @num - Node number to use when creating the device.
 112  *
 113  * Initialize and register the node device.
 114  */
 115 int __init register_node(struct node *node, int num, struct node *parent)
 116 {
 117         int error;
 118
 119         node->cpumap = node_to_cpumask(num);
 120         node->sysdev.id = num;
 121         node->sysdev.cls = &node_class;
 122         error = sysdev_register(&node->sysdev);
 123
 124         if (!error){
 125                 sysdev_create_file(&node->sysdev, &attr_cpumap);
 126                 sysdev_create_file(&node->sysdev, &attr_meminfo);
 127                 sysdev_create_file(&node->sysdev, &attr_numastat);
 128         }
 129         return error;
 130 }
 131
 132
 133 int __init register_node_type(void)
 134 {
 135         return sysdev_class_register(&node_class);
 136 }
 137 postcore_initcall(register_node_type);