original development tree for Linux kernel GTP module; now long in mainline.
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/*
* drivers/base/node.c - basic Node class support
*/
#include <linux/sysdev.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/node.h>
#include <linux/hugetlb.h>
#include <linux/cpumask.h>
#include <linux/topology.h>
#include <linux/nodemask.h>
static struct sysdev_class node_class = {
set_kset_name("node"),
};
static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
{
struct node *node_dev = to_node(dev);
cpumask_t mask = node_to_cpumask(node_dev->sysdev.id);
int len;
/* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
len += sprintf(buf + len, "\n");
return len;
}
static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
#define K(x) ((x) << (PAGE_SHIFT - 10))
static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
{
int n;
int nid = dev->id;
struct sysinfo i;
struct page_state ps;
unsigned long inactive;
unsigned long active;
unsigned long free;
si_meminfo_node(&i, nid);
get_page_state_node(&ps, nid);
__get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
/* Check for negative values in these approximate counters */
if ((long)ps.nr_dirty < 0)
ps.nr_dirty = 0;
if ((long)ps.nr_writeback < 0)
ps.nr_writeback = 0;
if ((long)ps.nr_mapped < 0)
ps.nr_mapped = 0;
if ((long)ps.nr_slab < 0)
ps.nr_slab = 0;
n = sprintf(buf, "\n"
"Node %d MemTotal: %8lu kB\n"
"Node %d MemFree: %8lu kB\n"
"Node %d MemUsed: %8lu kB\n"
"Node %d Active: %8lu kB\n"
"Node %d Inactive: %8lu kB\n"
"Node %d HighTotal: %8lu kB\n"
"Node %d HighFree: %8lu kB\n"
"Node %d LowTotal: %8lu kB\n"
"Node %d LowFree: %8lu kB\n"
"Node %d Dirty: %8lu kB\n"
"Node %d Writeback: %8lu kB\n"
"Node %d Mapped: %8lu kB\n"
"Node %d Slab: %8lu kB\n",
nid, K(i.totalram),
nid, K(i.freeram),
nid, K(i.totalram - i.freeram),
nid, K(active),
nid, K(inactive),
nid, K(i.totalhigh),
nid, K(i.freehigh),
nid, K(i.totalram - i.totalhigh),
nid, K(i.freeram - i.freehigh),
nid, K(ps.nr_dirty),
nid, K(ps.nr_writeback),
nid, K(ps.nr_mapped),
nid, K(ps.nr_slab));
n += hugetlb_report_node_meminfo(nid, buf + n);
return n;
}
#undef K
static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
{
unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
unsigned long local_node, other_node;
int i, cpu;
pg_data_t *pg = NODE_DATA(dev->id);
numa_hit = 0;
numa_miss = 0;
interleave_hit = 0;
numa_foreign = 0;
local_node = 0;
other_node = 0;
for (i = 0; i < MAX_NR_ZONES; i++) {
struct zone *z = &pg->node_zones[i];
for (cpu = 0; cpu < NR_CPUS; cpu++) {
struct per_cpu_pageset *ps = zone_pcp(z,cpu);
numa_hit += ps->numa_hit;
numa_miss += ps->numa_miss;
numa_foreign += ps->numa_foreign;
interleave_hit += ps->interleave_hit;
local_node += ps->local_node;
other_node += ps->other_node;
}
}
return sprintf(buf,
"numa_hit %lu\n"
"numa_miss %lu\n"
"numa_foreign %lu\n"
"interleave_hit %lu\n"
"local_node %lu\n"
"other_node %lu\n",
numa_hit,
numa_miss,
numa_foreign,
interleave_hit,
local_node,
other_node);
}
static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
static ssize_t node_read_distance(struct sys_device * dev, char * buf)
{
int nid = dev->id;
int len = 0;
int i;
/* buf currently PAGE_SIZE, need ~4 chars per node */
BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
for_each_online_node(i)
len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
len += sprintf(buf + len, "\n");
return len;
}
static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
/*
* register_node - Setup a driverfs device for a node.
* @num - Node number to use when creating the device.
*
* Initialize and register the node device.
*/
int register_node(struct node *node, int num, struct node *parent)
{
int error;
node->sysdev.id = num;
node->sysdev.cls = &node_class;
error = sysdev_register(&node->sysdev);
if (!error){
sysdev_create_file(&node->sysdev, &attr_cpumap);
sysdev_create_file(&node->sysdev, &attr_meminfo);
sysdev_create_file(&node->sysdev, &attr_numastat);
sysdev_create_file(&node->sysdev, &attr_distance);
}
return error;
}
/**
* unregister_node - unregister a node device
* @node: node going away
*
* Unregisters a node device @node. All the devices on the node must be
* unregistered before calling this function.
*/
void unregister_node(struct node *node)
{
sysdev_remove_file(&node->sysdev, &attr_cpumap);
sysdev_remove_file(&node->sysdev, &attr_meminfo);
sysdev_remove_file(&node->sysdev, &attr_numastat);
sysdev_remove_file(&node->sysdev, &attr_distance);
sysdev_unregister(&node->sysdev);
}
static int __init register_node_type(void)
{
return sysdev_class_register(&node_class);
}
postcore_initcall(register_node_type);