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         struct page_state ps;
  43         unsigned long inactive;
  44         unsigned long active;
  45         unsigned long free;
  46
  47         si_meminfo_node(&i, nid);
  48         get_page_state_node(&ps, nid);
  49         __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
  50
  51         /* Check for negative values in these approximate counters */
  52         if ((long)ps.nr_dirty < 0)
  53                 ps.nr_dirty = 0;
  54         if ((long)ps.nr_writeback < 0)
  55                 ps.nr_writeback = 0;
  56         if ((long)ps.nr_mapped < 0)
  57                 ps.nr_mapped = 0;
  58         if ((long)ps.nr_slab < 0)
  59                 ps.nr_slab = 0;
  60
  61         n = sprintf(buf, "\n"
  62                        "Node %d MemTotal:     %8lu kB\n"
  63                        "Node %d MemFree:      %8lu kB\n"
  64                        "Node %d MemUsed:      %8lu kB\n"
  65                        "Node %d Active:       %8lu kB\n"
  66                        "Node %d Inactive:     %8lu kB\n"
  67                        "Node %d HighTotal:    %8lu kB\n"
  68                        "Node %d HighFree:     %8lu kB\n"
  69                        "Node %d LowTotal:     %8lu kB\n"
  70                        "Node %d LowFree:      %8lu kB\n"
  71                        "Node %d Dirty:        %8lu kB\n"
  72                        "Node %d Writeback:    %8lu kB\n"
  73                        "Node %d Mapped:       %8lu kB\n"
  74                        "Node %d Slab:         %8lu kB\n",
  75                        nid, K(i.totalram),
  76                        nid, K(i.freeram),
  77                        nid, K(i.totalram - i.freeram),
  78                        nid, K(active),
  79                        nid, K(inactive),
  80                        nid, K(i.totalhigh),
  81                        nid, K(i.freehigh),
  82                        nid, K(i.totalram - i.totalhigh),
  83                        nid, K(i.freeram - i.freehigh),
  84                        nid, K(ps.nr_dirty),
  85                        nid, K(ps.nr_writeback),
  86                        nid, K(ps.nr_mapped),
  87                        nid, K(ps.nr_slab));
  88         n += hugetlb_report_node_meminfo(nid, buf + n);
  89         return n;
  90 }
  91
  92 #undef K
  93 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
  94
  95 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
  96 {
  97         unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
  98         unsigned long local_node, other_node;
  99         int i, cpu;
 100         pg_data_t *pg = NODE_DATA(dev->id);
 101         numa_hit = 0;
 102         numa_miss = 0;
 103         interleave_hit = 0;
 104         numa_foreign = 0;
 105         local_node = 0;
 106         other_node = 0;
 107         for (i = 0; i < MAX_NR_ZONES; i++) {
 108                 struct zone *z = &pg->node_zones[i];
 109                 for_each_online_cpu(cpu) {
 110                         struct per_cpu_pageset *ps = zone_pcp(z,cpu);
 111                         numa_hit += ps->numa_hit;
 112                         numa_miss += ps->numa_miss;
 113                         numa_foreign += ps->numa_foreign;
 114                         interleave_hit += ps->interleave_hit;
 115                         local_node += ps->local_node;
 116                         other_node += ps->other_node;
 117                 }
 118         }
 119         return sprintf(buf,
 120                        "numa_hit %lu\n"
 121                        "numa_miss %lu\n"
 122                        "numa_foreign %lu\n"
 123                        "interleave_hit %lu\n"
 124                        "local_node %lu\n"
 125                        "other_node %lu\n",
 126                        numa_hit,
 127                        numa_miss,
 128                        numa_foreign,
 129                        interleave_hit,
 130                        local_node,
 131                        other_node);
 132 }
 133 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 134
 135 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
 136 {
 137         int nid = dev->id;
 138         int len = 0;
 139         int i;
 140
 141         /* buf currently PAGE_SIZE, need ~4 chars per node */
 142         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
 143
 144         for_each_online_node(i)
 145                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
 146
 147         len += sprintf(buf + len, "\n");
 148         return len;
 149 }
 150 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
 151
 152
 153 /*
 154  * register_node - Setup a driverfs device for a node.
 155  * @num - Node number to use when creating the device.
 156  *
 157  * Initialize and register the node device.
 158  */
 159 int register_node(struct node *node, int num, struct node *parent)
 160 {
 161         int error;
 162
 163         node->sysdev.id = num;
 164         node->sysdev.cls = &node_class;
 165         error = sysdev_register(&node->sysdev);
 166
 167         if (!error){
 168                 sysdev_create_file(&node->sysdev, &attr_cpumap);
 169                 sysdev_create_file(&node->sysdev, &attr_meminfo);
 170                 sysdev_create_file(&node->sysdev, &attr_numastat);
 171                 sysdev_create_file(&node->sysdev, &attr_distance);
 172         }
 173         return error;
 174 }
 175
 176 /**
 177  * unregister_node - unregister a node device
 178  * @node: node going away
 179  *
 180  * Unregisters a node device @node.  All the devices on the node must be
 181  * unregistered before calling this function.
 182  */
 183 void unregister_node(struct node *node)
 184 {
 185         sysdev_remove_file(&node->sysdev, &attr_cpumap);
 186         sysdev_remove_file(&node->sysdev, &attr_meminfo);
 187         sysdev_remove_file(&node->sysdev, &attr_numastat);
 188         sysdev_remove_file(&node->sysdev, &attr_distance);
 189
 190         sysdev_unregister(&node->sysdev);
 191 }
 192
 193 static int __init register_node_type(void)
 194 {
 195         return sysdev_class_register(&node_class);
 196 }
 197 postcore_initcall(register_node_type);