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_to_cpumask(node_dev->sysdev.id);
  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         unsigned long inactive;
  42         unsigned long active;
  43         unsigned long free;
  44
  45         si_meminfo_node(&i, nid);
  46         __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
  47
  48         n = sprintf(buf, "\n"
  49                        "Node %d MemTotal:     %8lu kB\n"
  50                        "Node %d MemFree:      %8lu kB\n"
  51                        "Node %d MemUsed:      %8lu kB\n"
  52                        "Node %d Active:       %8lu kB\n"
  53                        "Node %d Inactive:     %8lu kB\n"
  54                        "Node %d HighTotal:    %8lu kB\n"
  55                        "Node %d HighFree:     %8lu kB\n"
  56                        "Node %d LowTotal:     %8lu kB\n"
  57                        "Node %d LowFree:      %8lu kB\n",
  58                        nid, K(i.totalram),
  59                        nid, K(i.freeram),
  60                        nid, K(i.totalram - i.freeram),
  61                        nid, K(active),
  62                        nid, K(inactive),
  63                        nid, K(i.totalhigh),
  64                        nid, K(i.freehigh),
  65                        nid, K(i.totalram - i.totalhigh),
  66                        nid, K(i.freeram - i.freehigh));
  67         n += hugetlb_report_node_meminfo(nid, buf + n);
  68         return n;
  69 }
  70
  71 #undef K
  72 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
  73
  74 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
  75 {
  76         unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
  77         unsigned long local_node, other_node;
  78         int i, cpu;
  79         pg_data_t *pg = NODE_DATA(dev->id);
  80         numa_hit = 0;
  81         numa_miss = 0;
  82         interleave_hit = 0;
  83         numa_foreign = 0;
  84         local_node = 0;
  85         other_node = 0;
  86         for (i = 0; i < MAX_NR_ZONES; i++) {
  87                 struct zone *z = &pg->node_zones[i];
  88                 for (cpu = 0; cpu < NR_CPUS; cpu++) {
  89                         struct per_cpu_pageset *ps = &z->pageset[cpu];
  90                         numa_hit += ps->numa_hit;
  91                         numa_miss += ps->numa_miss;
  92                         numa_foreign += ps->numa_foreign;
  93                         interleave_hit += ps->interleave_hit;
  94                         local_node += ps->local_node;
  95                         other_node += ps->other_node;
  96                 }
  97         }
  98         return sprintf(buf,
  99                        "numa_hit %lu\n"
 100                        "numa_miss %lu\n"
 101                        "numa_foreign %lu\n"
 102                        "interleave_hit %lu\n"
 103                        "local_node %lu\n"
 104                        "other_node %lu\n",
 105                        numa_hit,
 106                        numa_miss,
 107                        numa_foreign,
 108                        interleave_hit,
 109                        local_node,
 110                        other_node);
 111 }
 112 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 113
 114 /*
 115  * register_node - Setup a driverfs device for a node.
 116  * @num - Node number to use when creating the device.
 117  *
 118  * Initialize and register the node device.
 119  */
 120 int __init register_node(struct node *node, int num, struct node *parent)
 121 {
 122         int error;
 123
 124         node->sysdev.id = num;
 125         node->sysdev.cls = &node_class;
 126         error = sysdev_register(&node->sysdev);
 127
 128         if (!error){
 129                 sysdev_create_file(&node->sysdev, &attr_cpumap);
 130                 sysdev_create_file(&node->sysdev, &attr_meminfo);
 131                 sysdev_create_file(&node->sysdev, &attr_numastat);
 132         }
 133         return error;
 134 }
 135
 136
 137 int __init register_node_type(void)
 138 {
 139         return sysdev_class_register(&node_class);
 140 }
 141 postcore_initcall(register_node_type);