Release 4.14 drivers/base/node.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Basic Node interface support
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/memory.h>
#include <linux/vmstat.h>
#include <linux/notifier.h>
#include <linux/node.h>
#include <linux/hugetlb.h>
#include <linux/compaction.h>
#include <linux/cpumask.h>
#include <linux/topology.h>
#include <linux/nodemask.h>
#include <linux/cpu.h>
#include <linux/device.h>
#include <linux/swap.h>
#include <linux/slab.h>


static struct bus_type node_subsys = {
	.name = "node",
	.dev_name = "node",
};




static ssize_t node_read_cpumap(struct device *dev, bool list, char *buf)
{
	ssize_t n;
	cpumask_var_t mask;
	struct node *node_dev = to_node(dev);

	/* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
	BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));

	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
		return 0;

	cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask);
	n = cpumap_print_to_pagebuf(list, buf, mask);
	free_cpumask_var(mask);

	return n;
}

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static inline ssize_t node_read_cpumask(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	return node_read_cpumap(dev, false, buf);
}
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static inline ssize_t node_read_cpulist(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	return node_read_cpumap(dev, true, buf);
}

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static DEVICE_ATTR(cpumap,  S_IRUGO, node_read_cpumask, NULL);
static DEVICE_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);


#define K(x) ((x) << (PAGE_SHIFT - 10))


static ssize_t node_read_meminfo(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	int n;
	int nid = dev->id;
	struct pglist_data *pgdat = NODE_DATA(nid);
	struct sysinfo i;

	si_meminfo_node(&i, nid);
	n = sprintf(buf,
		       "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 Active(anon):   %8lu kB\n"
		       "Node %d Inactive(anon): %8lu kB\n"
		       "Node %d Active(file):   %8lu kB\n"
		       "Node %d Inactive(file): %8lu kB\n"
		       "Node %d Unevictable:    %8lu kB\n"
		       "Node %d Mlocked:        %8lu kB\n",
		       nid, K(i.totalram),
		       nid, K(i.freeram),
		       nid, K(i.totalram - i.freeram),
		       nid, K(node_page_state(pgdat, NR_ACTIVE_ANON) +
				node_page_state(pgdat, NR_ACTIVE_FILE)),
		       nid, K(node_page_state(pgdat, NR_INACTIVE_ANON) +
				node_page_state(pgdat, NR_INACTIVE_FILE)),
		       nid, K(node_page_state(pgdat, NR_ACTIVE_ANON)),
		       nid, K(node_page_state(pgdat, NR_INACTIVE_ANON)),
		       nid, K(node_page_state(pgdat, NR_ACTIVE_FILE)),
		       nid, K(node_page_state(pgdat, NR_INACTIVE_FILE)),
		       nid, K(node_page_state(pgdat, NR_UNEVICTABLE)),
		       nid, K(sum_zone_node_page_state(nid, NR_MLOCK)));

#ifdef CONFIG_HIGHMEM
	n += sprintf(buf + 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",
		       nid, K(i.totalhigh),
		       nid, K(i.freehigh),
		       nid, K(i.totalram - i.totalhigh),
		       nid, K(i.freeram - i.freehigh));
#endif
	n += sprintf(buf + 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 Shmem:          %8lu kB\n"
		       "Node %d KernelStack:    %8lu kB\n"
		       "Node %d PageTables:     %8lu kB\n"
		       "Node %d NFS_Unstable:   %8lu kB\n"
		       "Node %d Bounce:         %8lu kB\n"
		       "Node %d WritebackTmp:   %8lu kB\n"
		       "Node %d Slab:           %8lu kB\n"
		       "Node %d SReclaimable:   %8lu kB\n"
		       "Node %d SUnreclaim:     %8lu kB\n"
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
		       "Node %d AnonHugePages:  %8lu kB\n"
		       "Node %d ShmemHugePages: %8lu kB\n"
		       "Node %d ShmemPmdMapped: %8lu kB\n"
#endif
			,
		       nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
		       nid, K(node_page_state(pgdat, NR_WRITEBACK)),
		       nid, K(node_page_state(pgdat, NR_FILE_PAGES)),
		       nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
		       nid, K(node_page_state(pgdat, NR_ANON_MAPPED)),
		       nid, K(i.sharedram),
		       nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK_KB),
		       nid, K(sum_zone_node_page_state(nid, NR_PAGETABLE)),
		       nid, K(node_page_state(pgdat, NR_UNSTABLE_NFS)),
		       nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)),
		       nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
		       nid, K(node_page_state(pgdat, NR_SLAB_RECLAIMABLE) +
			      node_page_state(pgdat, NR_SLAB_UNRECLAIMABLE)),
		       nid, K(node_page_state(pgdat, NR_SLAB_RECLAIMABLE)),
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
		       nid, K(node_page_state(pgdat, NR_SLAB_UNRECLAIMABLE)),
		       nid, K(node_page_state(pgdat, NR_ANON_THPS) *
				       HPAGE_PMD_NR),
		       nid, K(node_page_state(pgdat, NR_SHMEM_THPS) *
				       HPAGE_PMD_NR),
		       nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) *
				       HPAGE_PMD_NR));
#else
		       nid, K(node_page_state(pgdat, NR_SLAB_UNRECLAIMABLE)));
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#endif
	n += hugetlb_report_node_meminfo(nid, buf + n);
	return n;
}


#undef K
static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);



static ssize_t node_read_numastat(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	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",
		       sum_zone_numa_state(dev->id, NUMA_HIT),
		       sum_zone_numa_state(dev->id, NUMA_MISS),
		       sum_zone_numa_state(dev->id, NUMA_FOREIGN),
		       sum_zone_numa_state(dev->id, NUMA_INTERLEAVE_HIT),
		       sum_zone_numa_state(dev->id, NUMA_LOCAL),
		       sum_zone_numa_state(dev->id, NUMA_OTHER));
}
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static DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);



static ssize_t node_read_vmstat(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	int nid = dev->id;
	struct pglist_data *pgdat = NODE_DATA(nid);
	int i;
	int n = 0;

	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
		n += sprintf(buf+n, "%s %lu\n", vmstat_text[i],
			     sum_zone_node_page_state(nid, i));

#ifdef CONFIG_NUMA
	for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++)
		n += sprintf(buf+n, "%s %lu\n",
			     vmstat_text[i + NR_VM_ZONE_STAT_ITEMS],
			     sum_zone_numa_state(nid, i));
#endif

	for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
		n += sprintf(buf+n, "%s %lu\n",
			     vmstat_text[i + NR_VM_ZONE_STAT_ITEMS +
			     NR_VM_NUMA_STAT_ITEMS],
			     node_page_state(pgdat, i));

	return n;
}
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static DEVICE_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL);



static ssize_t node_read_distance(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	int nid = dev->id;
	int len = 0;
	int i;

	/*
         * buf is currently PAGE_SIZE in length and each node needs 4 chars
         * at the most (distance + space or newline).
         */
	BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);

	for_each_online_node(i)
		len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));

	len += sprintf(buf + len, "\n");
	return len;
}
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static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL);


static struct attribute *node_dev_attrs[] = {
	&dev_attr_cpumap.attr,
	&dev_attr_cpulist.attr,
	&dev_attr_meminfo.attr,
	&dev_attr_numastat.attr,
	&dev_attr_distance.attr,
	&dev_attr_vmstat.attr,
	NULL
};

ATTRIBUTE_GROUPS(node_dev);

#ifdef CONFIG_HUGETLBFS
/*
 * hugetlbfs per node attributes registration interface:
 * When/if hugetlb[fs] subsystem initializes [sometime after this module],
 * it will register its per node attributes for all online nodes with
 * memory.  It will also call register_hugetlbfs_with_node(), below, to
 * register its attribute registration functions with this node driver.
 * Once these hooks have been initialized, the node driver will call into
 * the hugetlb module to [un]register attributes for hot-plugged nodes.
 */

static node_registration_func_t __hugetlb_register_node;

static node_registration_func_t __hugetlb_unregister_node;



static inline bool hugetlb_register_node(struct node *node)
{
	if (__hugetlb_register_node &&
			node_state(node->dev.id, N_MEMORY)) {
		__hugetlb_register_node(node);
		return true;
	}
	return false;
}

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static inline void hugetlb_unregister_node(struct node *node)
{
	if (__hugetlb_unregister_node)
		__hugetlb_unregister_node(node);
}

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void register_hugetlbfs_with_node(node_registration_func_t doregister,
				  node_registration_func_t unregister)
{
	__hugetlb_register_node   = doregister;
	__hugetlb_unregister_node = unregister;
}
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#else


static inline void hugetlb_register_node(struct node *node) {}

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static inline void hugetlb_unregister_node(struct node *node) {}
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#endif



static void node_device_release(struct device *dev)
{
	struct node *node = to_node(dev);

#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
	/*
         * We schedule the work only when a memory section is
         * onlined/offlined on this node. When we come here,
         * all the memory on this node has been offlined,
         * so we won't enqueue new work to this work.
         *
         * The work is using node->node_work, so we should
         * flush work before freeing the memory.
         */
	flush_work(&node->node_work);
#endif
	kfree(node);
}

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/*
 * register_node - Setup a sysfs device for a node.
 * @num - Node number to use when creating the device.
 *
 * Initialize and register the node device.
 */


static int register_node(struct node *node, int num)
{
	int error;

	node->dev.id = num;
	node->dev.bus = &node_subsys;
	node->dev.release = node_device_release;
	node->dev.groups = node_dev_groups;
	error = device_register(&node->dev);

	if (!error){
		hugetlb_register_node(node);

		compaction_register_node(node);
	}
	return error;
}

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/**
 * 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)
{
	hugetlb_unregister_node(node);		/* no-op, if memoryless node */

	device_unregister(&node->dev);
}

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struct node *node_devices[MAX_NUMNODES];

/*
 * register cpu under node
 */


int register_cpu_under_node(unsigned int cpu, unsigned int nid)
{
	int ret;
	struct device *obj;

	if (!node_online(nid))
		return 0;

	obj = get_cpu_device(cpu);
	if (!obj)
		return 0;

	ret = sysfs_create_link(&node_devices[nid]->dev.kobj,
				&obj->kobj,
				kobject_name(&obj->kobj));
	if (ret)
		return ret;

	return sysfs_create_link(&obj->kobj,
				 &node_devices[nid]->dev.kobj,
				 kobject_name(&node_devices[nid]->dev.kobj));
}

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int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
{
	struct device *obj;

	if (!node_online(nid))
		return 0;

	obj = get_cpu_device(cpu);
	if (!obj)
		return 0;

	sysfs_remove_link(&node_devices[nid]->dev.kobj,
			  kobject_name(&obj->kobj));
	sysfs_remove_link(&obj->kobj,
			  kobject_name(&node_devices[nid]->dev.kobj));

	return 0;
}

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#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE


static int __ref get_nid_for_pfn(unsigned long pfn)
{
	if (!pfn_valid_within(pfn))
		return -1;
#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
	if (system_state < SYSTEM_RUNNING)
		return early_pfn_to_nid(pfn);
#endif
	return pfn_to_nid(pfn);
}

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/* register memory section under specified node if it spans that node */


int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
{
	int ret;
	unsigned long pfn, sect_start_pfn, sect_end_pfn;

	if (!mem_blk)
		return -EFAULT;
	if (!node_online(nid))
		return 0;

	sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
	sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr);
	sect_end_pfn += PAGES_PER_SECTION - 1;
	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
		int page_nid;

		/*
                 * memory block could have several absent sections from start.
                 * skip pfn range from absent section
                 */
		if (!pfn_present(pfn)) {
			pfn = round_down(pfn + PAGES_PER_SECTION,
					 PAGES_PER_SECTION) - 1;
			continue;
		}

		page_nid = get_nid_for_pfn(pfn);
		if (page_nid < 0)
			continue;
		if (page_nid != nid)
			continue;
		ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
					&mem_blk->dev.kobj,
					kobject_name(&mem_blk->dev.kobj));
		if (ret)
			return ret;

		return sysfs_create_link_nowarn(&mem_blk->dev.kobj,
				&node_devices[nid]->dev.kobj,
				kobject_name(&node_devices[nid]->dev.kobj));
	}
	/* mem section does not span the specified node */
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Gary Hade
124
59.33%
1
16.67%
Alexander Chiang
41
19.62%
1
16.67%
Yinghai Lu
25
11.96%
1
16.67%
Nathan Fontenot
10
4.78%
1
16.67%
Kay Sievers
6
2.87%
1
16.67%
Wen Congyang
3
1.44%
1
16.67%
Total
209
100.00%
6
100.00%

/* unregister memory section under all nodes that it spans */


int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
				    unsigned long phys_index)
{
	NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
	unsigned long pfn, sect_start_pfn, sect_end_pfn;

	if (!mem_blk) {
		NODEMASK_FREE(unlinked_nodes);
		return -EFAULT;
	}
	if (!unlinked_nodes)
		return -ENOMEM;
	nodes_clear(*unlinked_nodes);

	sect_start_pfn = section_nr_to_pfn(phys_index);
	sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
		int nid;

		nid = get_nid_for_pfn(pfn);
		if (nid < 0)
			continue;
		if (!node_online(nid))
			continue;
		if (node_test_and_set(nid, *unlinked_nodes))
			continue;
		sysfs_remove_link(&node_devices[nid]->dev.kobj,
			 kobject_name(&mem_blk->dev.kobj));
		sysfs_remove_link(&mem_blk->dev.kobj,
			 kobject_name(&node_devices[nid]->dev.kobj));
	}
	NODEMASK_FREE(unlinked_nodes);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Gary Hade
123
67.21%
1
16.67%
David Rientjes
30
16.39%
1
16.67%
Alexander Chiang
20
10.93%
1
16.67%
Nathan Fontenot
4
2.19%
1
16.67%
Kay Sievers
4
2.19%
1
16.67%
Wen Congyang
2
1.09%
1
16.67%
Total
183
100.00%
6
100.00%



int link_mem_sections(int nid, unsigned long start_pfn, unsigned long nr_pages)
{
	unsigned long end_pfn = start_pfn + nr_pages;
	unsigned long pfn;
	struct memory_block *mem_blk = NULL;
	int err = 0;

	for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
		unsigned long section_nr = pfn_to_section_nr(pfn);
		struct mem_section *mem_sect;
		int ret;

		if (!present_section_nr(section_nr))
			continue;
		mem_sect = __nr_to_section(section_nr);

		/* same memblock ? */
		if (mem_blk)
			if ((section_nr >= mem_blk->start_section_nr) &&
			    (section_nr <= mem_blk->end_section_nr))
				continue;

		mem_blk = find_memory_block_hinted(mem_sect, mem_blk);

		ret = register_mem_sect_under_node(mem_blk, nid);
		if (!err)
			err = ret;

		/* discard ref obtained in find_memory_block() */
	}

	if (mem_blk)
		kobject_put(&mem_blk->dev.kobj);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Gary Hade
110
69.62%
1
20.00%
Yinghai Lu
24
15.19%
1
20.00%
Robin Holt
15
9.49%
1
20.00%
Michal Hocko
8
5.06%
1
20.00%
Kay Sievers
1
0.63%
1
20.00%
Total
158
100.00%
5
100.00%

#ifdef CONFIG_HUGETLBFS
/*
 * Handle per node hstate attribute [un]registration on transistions
 * to/from memoryless state.
 */


static void node_hugetlb_work(struct work_struct *work)
{
	struct node *node = container_of(work, struct node, node_work);

	/*
         * We only get here when a node transitions to/from memoryless state.
         * We can detect which transition occurred by examining whether the
         * node has memory now.  hugetlb_register_node() already check this
         * so we try to register the attributes.  If that fails, then the
         * node has transitioned to memoryless, try to unregister the
         * attributes.
         */
	if (!hugetlb_register_node(node))
		hugetlb_unregister_node(node);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lee Schermerhorn
40
100.00%
1
100.00%
Total
40
100.00%
1
100.00%



static void init_node_hugetlb_work(int nid)
{
	INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lee Schermerhorn
21
95.45%
1
50.00%
Wen Congyang
1
4.55%
1
50.00%
Total
22
100.00%
2
100.00%



static int node_memory_callback(struct notifier_block *self,
				unsigned long action, void *arg)
{
	struct memory_notify *mnb = arg;
	int nid = mnb->status_change_nid;

	switch (action) {
	case MEM_ONLINE:
	case MEM_OFFLINE:
		/*
                 * offload per node hstate [un]registration to a work thread
                 * when transitioning to/from memoryless state.
                 */
		if (nid != NUMA_NO_NODE)
			schedule_work(&node_devices[nid]->node_work);
		break;

	case MEM_GOING_ONLINE:
	case MEM_GOING_OFFLINE:
	case MEM_CANCEL_ONLINE:
	case MEM_CANCEL_OFFLINE:
	default:
		break;
	}

	return NOTIFY_OK;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Lee Schermerhorn
80
98.77%
2
66.67%
Wen Congyang
1
1.23%
1
33.33%
Total
81
100.00%
3
100.00%

#endif	/* CONFIG_HUGETLBFS */
#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */

#if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
    !defined(CONFIG_HUGETLBFS)


static inline int node_memory_callback(struct notifier_block *self,
				unsigned long action, void *arg)
{
	return NOTIFY_OK;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lee Schermerhorn
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%



static void init_node_hugetlb_work(int nid) { }

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lee Schermerhorn
8
100.00%
1
100.00%
Total
8
100.00%
1
100.00%

#endif



int __register_one_node(int nid)
{
	int error;
	int cpu;

	node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
	if (!node_devices[nid])
		return -ENOMEM;

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

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

	/* initialize work queue for memory hot plug */
	init_node_hugetlb_work(nid);

	return error;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Wen Congyang
28
32.56%
1
20.00%
Yasunori Goto
23
26.74%
1
20.00%
Kamezawa Hiroyuki
23
26.74%
1
20.00%
Michal Hocko
6
6.98%
1
20.00%
Lee Schermerhorn
6
6.98%
1
20.00%
Total
86
100.00%
5
100.00%



void unregister_one_node(int nid)
{
	if (!node_devices[nid])
		return;

	unregister_node(node_devices[nid]);
	node_devices[nid] = NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yasunori Goto
16
50.00%
1
33.33%
Xishi Qiu
9
28.12%
1
33.33%
Wen Congyang
7
21.88%
1
33.33%
Total
32
100.00%
3
100.00%

/*
 * node states attributes
 */



static ssize_t print_nodes_state(enum node_states state, char *buf)
{
	int n;

	n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl",
		      nodemask_pr_args(&node_states[state]));
	buf[n++] = '\n';
	buf[n] = '\0';
	return n;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lee Schermerhorn
44
77.19%
1
33.33%
Tejun Heo
8
14.04%
1
33.33%
Ryota Ozaki
5
8.77%
1
33.33%
Total
57
100.00%
3
100.00%


struct node_attr {
	
struct device_attribute attr;
	
enum node_states state;
};



static ssize_t show_node_state(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	struct node_attr *na = container_of(attr, struct node_attr, attr);
	return print_nodes_state(na->state, buf);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
23
51.11%
2
50.00%
Lee Schermerhorn
19
42.22%
1
25.00%
Kay Sievers
3
6.67%
1
25.00%
Total
45
100.00%
4
100.00%


#define _NODE_ATTR(name, state) \
	{ __ATTR(name, 0444, show_node_state, NULL), state }


static struct node_attr node_state_attr[] = {
	[N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE),
	[N_ONLINE] = _NODE_ATTR(online, N_ONLINE),
	[N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
#ifdef CONFIG_HIGHMEM
	[N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
#endif
	[N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
	[N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
};


static struct attribute *node_state_attrs[] = {
	&node_state_attr[N_POSSIBLE].attr.attr,
	&node_state_attr[N_ONLINE].attr.attr,
	&node_state_attr[N_NORMAL_MEMORY].attr.attr,
#ifdef CONFIG_HIGHMEM
	&node_state_attr[N_HIGH_MEMORY].attr.attr,
#endif
	&node_state_attr[N_MEMORY].attr.attr,
	&node_state_attr[N_CPU].attr.attr,
	NULL
};


static struct attribute_group memory_root_attr_group = {
	.attrs = node_state_attrs,
};


static const struct attribute_group *cpu_root_attr_groups[] = {
	&memory_root_attr_group,
	NULL,
};


#define NODE_CALLBACK_PRI	2	
/* lower than SLAB */


static int __init register_node_type(void)
{
	int ret;

 	BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
 	BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);

	ret = subsys_system_register(&node_subsys, cpu_root_attr_groups);
	if (!ret) {
		static struct notifier_block node_memory_callback_nb = {
			.notifier_call = node_memory_callback,
			.priority = NODE_CALLBACK_PRI,
                };
		register_hotmemory_notifier(&node_memory_callback_nb);
	}

	/*
         * Note:  we're not going to unregister the node class if we fail
         * to register the node state class attribute files.
         */
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
28
35.90%
2
25.00%
Andi Kleen
22
28.21%
1
12.50%
Lee Schermerhorn
20
25.64%
2
25.00%
Kay Sievers
4
5.13%
1
12.50%
Patrick Mochel
3
3.85%
1
12.50%
Keiichiro Tokunaga
1
1.28%
1
12.50%
Total
78
100.00%
8
100.00%


postcore_initcall(register_node_type);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Lee Schermerhorn
470
15.41%
6
5.94%
Gary Hade
395
12.95%
1
0.99%
Andrew Morton
339
11.11%
8
7.92%
Andi Kleen
230
7.54%
6
5.94%
Alexander Chiang
144
4.72%
4
3.96%
Kamezawa Hiroyuki
133
4.36%
1
0.99%
Christoph Lameter
131
4.30%
13
12.87%
Mel Gorman
125
4.10%
7
6.93%
Kay Sievers
103
3.38%
3
2.97%
Motohiro Kosaki
90
2.95%
4
3.96%
Mike Travis
74
2.43%
1
0.99%
Rik Van Riel
61
2.00%
1
0.99%
Lai Jiangshan
59
1.93%
3
2.97%
Yasuaki Ishimatsu
57
1.87%
2
1.98%
Kemi Wang
51
1.67%
1
0.99%
Yinghai Lu
49
1.61%
2
1.98%
Takashi Iwai
48
1.57%
1
0.99%
Michael Rubin
48
1.57%
1
0.99%
Wen Congyang
48
1.57%
1
0.99%
David Rientjes
48
1.57%
3
2.97%
Yasunori Goto
46
1.51%
1
0.99%
Zhen Lei
45
1.48%
1
0.99%
Claudio Scordino
29
0.95%
1
0.99%
Kirill A. Shutemov
27
0.89%
1
0.99%
Martin Hicks
22
0.72%
1
0.99%
Keiichiro Tokunaga
18
0.59%
1
0.99%
Robin Holt
15
0.49%
1
0.99%
Nathan Fontenot
14
0.46%
1
0.99%
Michal Hocko
14
0.46%
1
0.99%
Nicholas Piggin
12
0.39%
1
0.99%
Akinobu Mita
11
0.36%
1
0.99%
Tejun Heo
11
0.36%
3
2.97%
Johannes Weiner
10
0.33%
1
0.99%
Miklos Szeredi
10
0.33%
1
0.99%
Xishi Qiu
9
0.30%
1
0.99%
Matthew Dobson
7
0.23%
1
0.99%
Rusty Russell
7
0.23%
1
0.99%
Greg Kroah-Hartman
7
0.23%
2
1.98%
Sudeep Holla
7
0.23%
1
0.99%
John Blackwood
6
0.20%
1
0.99%
Ryota Ozaki
5
0.16%
1
0.99%
Patrick Mochel
4
0.13%
2
1.98%
Kenneth W. Chen
3
0.10%
1
0.99%
Rafael Aquini
3
0.10%
1
0.99%
Thomas Gleixner
2
0.07%
1
0.99%
Fabian Frederick
1
0.03%
1
0.99%
Robert P. J. Day
1
0.03%
1
0.99%
Andrew Lutomirski
1
0.03%
1
0.99%
Total
3050
100.00%
101
100.00%
Directory: drivers/base

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