drivers/base/node.c - maze/linux - Git at Google

 /*
  * 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>
 #include <linux/cpu.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;

 	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 FilePages:    %8lu kB\n"
 		       "Node %d Mapped:       %8lu kB\n"
 		       "Node %d AnonPages:    %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(node_page_state(nid, NR_FILE_PAGES)),
 		       nid, K(node_page_state(nid, NR_FILE_MAPPED)),
 		       nid, K(node_page_state(nid, NR_ANON_PAGES)),
 		       nid, K(node_page_state(nid, 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_each_online_cpu(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);
 }

 struct node node_devices[MAX_NUMNODES];

 /*
  * register cpu under node
  */
 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 {
 	if (node_online(nid)) {
 		struct sys_device *obj = get_cpu_sysdev(cpu);
 		if (!obj)
 			return 0;
 		return sysfs_create_link(&node_devices[nid].sysdev.kobj,
 					 &obj->kobj,
 					 kobject_name(&obj->kobj));
 	 }

 	return 0;
 }

 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 {
 	if (node_online(nid)) {
 		struct sys_device *obj = get_cpu_sysdev(cpu);
 		if (obj)
 			sysfs_remove_link(&node_devices[nid].sysdev.kobj,
 					 kobject_name(&obj->kobj));
 	}
 	return 0;
 }

 int register_one_node(int nid)
 {
 	int error = 0;
 	int cpu;

 	if (node_online(nid)) {
 		int p_node = parent_node(nid);
 		struct node *parent = NULL;

 		if (p_node != nid)
 			parent = &node_devices[p_node];

 		error = register_node(&node_devices[nid], nid, parent);

 		/* link cpu under this node */
 		for_each_present_cpu(cpu) {
 			if (cpu_to_node(cpu) == nid)
 				register_cpu_under_node(cpu, nid);
 		}
 	}

 	return error;

 }

 void unregister_one_node(int nid)
 {
 	unregister_node(&node_devices[nid]);
 }

 static int __init register_node_type(void)
 {
 	return sysdev_class_register(&node_class);
 }
 postcore_initcall(register_node_type);
	/*
	* 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>
	#include <linux/cpu.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;

	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 FilePages: %8lu kB\n"
	"Node %d Mapped: %8lu kB\n"
	"Node %d AnonPages: %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(node_page_state(nid, NR_FILE_PAGES)),
	nid, K(node_page_state(nid, NR_FILE_MAPPED)),
	nid, K(node_page_state(nid, NR_ANON_PAGES)),
	nid, K(node_page_state(nid, 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_each_online_cpu(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);
	}

	struct node node_devices[MAX_NUMNODES];

	/*
	* register cpu under node
	*/
	int register_cpu_under_node(unsigned int cpu, unsigned int nid)
	{
	if (node_online(nid)) {
	struct sys_device *obj = get_cpu_sysdev(cpu);
	if (!obj)
	return 0;
	return sysfs_create_link(&node_devices[nid].sysdev.kobj,
	&obj->kobj,
	kobject_name(&obj->kobj));
	}

	return 0;
	}

	int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
	{
	if (node_online(nid)) {
	struct sys_device *obj = get_cpu_sysdev(cpu);
	if (obj)
	sysfs_remove_link(&node_devices[nid].sysdev.kobj,
	kobject_name(&obj->kobj));
	}
	return 0;
	}

	int register_one_node(int nid)
	{
	int error = 0;
	int cpu;

	if (node_online(nid)) {
	int p_node = parent_node(nid);
	struct node *parent = NULL;

	if (p_node != nid)
	parent = &node_devices[p_node];

	error = register_node(&node_devices[nid], nid, parent);

	/* link cpu under this node */
	for_each_present_cpu(cpu) {
	if (cpu_to_node(cpu) == nid)
	register_cpu_under_node(cpu, nid);
	}
	}

	return error;

	}

	void unregister_one_node(int nid)
	{
	unregister_node(&node_devices[nid]);
	}

	static int __init register_node_type(void)
	{
	return sysdev_class_register(&node_class);
	}
	postcore_initcall(register_node_type);