240 lines
6.3 KiB
C
240 lines
6.3 KiB
C
/*
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* drivers/base/node.c - basic Node class support
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*/
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#include <linux/sysdev.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/node.h>
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#include <linux/hugetlb.h>
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#include <linux/cpumask.h>
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#include <linux/topology.h>
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#include <linux/nodemask.h>
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#include <linux/cpu.h>
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static struct sysdev_class node_class = {
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set_kset_name("node"),
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};
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static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
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{
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struct node *node_dev = to_node(dev);
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cpumask_t mask = node_to_cpumask(node_dev->sysdev.id);
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int len;
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/* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
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BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
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len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
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len += sprintf(buf + len, "\n");
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return len;
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}
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static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
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#define K(x) ((x) << (PAGE_SHIFT - 10))
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static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
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{
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int n;
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int nid = dev->id;
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struct sysinfo i;
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si_meminfo_node(&i, nid);
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n = sprintf(buf, "\n"
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"Node %d MemTotal: %8lu kB\n"
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"Node %d MemFree: %8lu kB\n"
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"Node %d MemUsed: %8lu kB\n"
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"Node %d Active: %8lu kB\n"
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"Node %d Inactive: %8lu kB\n"
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#ifdef CONFIG_HIGHMEM
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"Node %d HighTotal: %8lu kB\n"
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"Node %d HighFree: %8lu kB\n"
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"Node %d LowTotal: %8lu kB\n"
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"Node %d LowFree: %8lu kB\n"
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#endif
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"Node %d Dirty: %8lu kB\n"
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"Node %d Writeback: %8lu kB\n"
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"Node %d FilePages: %8lu kB\n"
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"Node %d Mapped: %8lu kB\n"
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"Node %d AnonPages: %8lu kB\n"
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"Node %d PageTables: %8lu kB\n"
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"Node %d NFS_Unstable: %8lu kB\n"
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"Node %d Bounce: %8lu kB\n"
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"Node %d Slab: %8lu kB\n"
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"Node %d SReclaimable: %8lu kB\n"
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"Node %d SUnreclaim: %8lu kB\n",
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nid, K(i.totalram),
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nid, K(i.freeram),
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nid, K(i.totalram - i.freeram),
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nid, node_page_state(nid, NR_ACTIVE),
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nid, node_page_state(nid, NR_INACTIVE),
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#ifdef CONFIG_HIGHMEM
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nid, K(i.totalhigh),
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nid, K(i.freehigh),
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nid, K(i.totalram - i.totalhigh),
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nid, K(i.freeram - i.freehigh),
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#endif
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nid, K(node_page_state(nid, NR_FILE_DIRTY)),
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nid, K(node_page_state(nid, NR_WRITEBACK)),
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nid, K(node_page_state(nid, NR_FILE_PAGES)),
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nid, K(node_page_state(nid, NR_FILE_MAPPED)),
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nid, K(node_page_state(nid, NR_ANON_PAGES)),
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nid, K(node_page_state(nid, NR_PAGETABLE)),
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nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
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nid, K(node_page_state(nid, NR_BOUNCE)),
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nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
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node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
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nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
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nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
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n += hugetlb_report_node_meminfo(nid, buf + n);
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return n;
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}
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#undef K
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static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
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static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
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{
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return sprintf(buf,
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"numa_hit %lu\n"
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"numa_miss %lu\n"
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"numa_foreign %lu\n"
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"interleave_hit %lu\n"
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"local_node %lu\n"
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"other_node %lu\n",
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node_page_state(dev->id, NUMA_HIT),
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node_page_state(dev->id, NUMA_MISS),
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node_page_state(dev->id, NUMA_FOREIGN),
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node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
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node_page_state(dev->id, NUMA_LOCAL),
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node_page_state(dev->id, NUMA_OTHER));
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}
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static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
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static ssize_t node_read_distance(struct sys_device * dev, char * buf)
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{
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int nid = dev->id;
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int len = 0;
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int i;
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/* buf currently PAGE_SIZE, need ~4 chars per node */
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BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
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for_each_online_node(i)
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len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
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len += sprintf(buf + len, "\n");
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return len;
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}
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static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
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/*
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* register_node - Setup a sysfs device for a node.
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* @num - Node number to use when creating the device.
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*
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* Initialize and register the node device.
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*/
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int register_node(struct node *node, int num, struct node *parent)
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{
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int error;
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node->sysdev.id = num;
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node->sysdev.cls = &node_class;
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error = sysdev_register(&node->sysdev);
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if (!error){
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sysdev_create_file(&node->sysdev, &attr_cpumap);
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sysdev_create_file(&node->sysdev, &attr_meminfo);
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sysdev_create_file(&node->sysdev, &attr_numastat);
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sysdev_create_file(&node->sysdev, &attr_distance);
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}
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return error;
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}
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/**
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* unregister_node - unregister a node device
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* @node: node going away
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*
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* Unregisters a node device @node. All the devices on the node must be
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* unregistered before calling this function.
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*/
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void unregister_node(struct node *node)
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{
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sysdev_remove_file(&node->sysdev, &attr_cpumap);
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sysdev_remove_file(&node->sysdev, &attr_meminfo);
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sysdev_remove_file(&node->sysdev, &attr_numastat);
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sysdev_remove_file(&node->sysdev, &attr_distance);
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sysdev_unregister(&node->sysdev);
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}
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struct node node_devices[MAX_NUMNODES];
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/*
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* register cpu under node
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*/
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int register_cpu_under_node(unsigned int cpu, unsigned int nid)
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{
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if (node_online(nid)) {
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struct sys_device *obj = get_cpu_sysdev(cpu);
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if (!obj)
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return 0;
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return sysfs_create_link(&node_devices[nid].sysdev.kobj,
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&obj->kobj,
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kobject_name(&obj->kobj));
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}
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return 0;
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}
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int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
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{
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if (node_online(nid)) {
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struct sys_device *obj = get_cpu_sysdev(cpu);
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if (obj)
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sysfs_remove_link(&node_devices[nid].sysdev.kobj,
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kobject_name(&obj->kobj));
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}
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return 0;
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}
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int register_one_node(int nid)
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{
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int error = 0;
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int cpu;
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if (node_online(nid)) {
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int p_node = parent_node(nid);
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struct node *parent = NULL;
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if (p_node != nid)
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parent = &node_devices[p_node];
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error = register_node(&node_devices[nid], nid, parent);
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/* link cpu under this node */
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for_each_present_cpu(cpu) {
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if (cpu_to_node(cpu) == nid)
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register_cpu_under_node(cpu, nid);
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}
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}
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return error;
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}
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void unregister_one_node(int nid)
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{
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unregister_node(&node_devices[nid]);
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}
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static int __init register_node_type(void)
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{
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return sysdev_class_register(&node_class);
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}
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postcore_initcall(register_node_type);
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