695 lines
18 KiB
C
695 lines
18 KiB
C
/*
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* Basic Node interface support
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*/
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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/memory.h>
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#include <linux/vmstat.h>
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#include <linux/notifier.h>
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#include <linux/node.h>
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#include <linux/hugetlb.h>
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#include <linux/compaction.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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#include <linux/device.h>
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#include <linux/swap.h>
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#include <linux/slab.h>
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static struct bus_type node_subsys = {
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.name = "node",
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.dev_name = "node",
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};
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static ssize_t node_read_cpumap(struct device *dev, int type, char *buf)
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{
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struct node *node_dev = to_node(dev);
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const struct cpumask *mask = cpumask_of_node(node_dev->dev.id);
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int len;
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/* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
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BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
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len = type?
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cpulist_scnprintf(buf, PAGE_SIZE-2, mask) :
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cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
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buf[len++] = '\n';
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buf[len] = '\0';
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return len;
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}
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static inline ssize_t node_read_cpumask(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return node_read_cpumap(dev, 0, buf);
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}
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static inline ssize_t node_read_cpulist(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return node_read_cpumap(dev, 1, buf);
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}
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static DEVICE_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
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static DEVICE_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
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#define K(x) ((x) << (PAGE_SHIFT - 10))
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static ssize_t node_read_meminfo(struct device *dev,
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struct device_attribute *attr, 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,
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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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"Node %d Active(anon): %8lu kB\n"
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"Node %d Inactive(anon): %8lu kB\n"
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"Node %d Active(file): %8lu kB\n"
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"Node %d Inactive(file): %8lu kB\n"
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"Node %d Unevictable: %8lu kB\n"
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"Node %d Mlocked: %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, K(node_page_state(nid, NR_ACTIVE_ANON) +
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node_page_state(nid, NR_ACTIVE_FILE)),
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nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
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node_page_state(nid, NR_INACTIVE_FILE)),
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nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
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nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
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nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
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nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
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nid, K(node_page_state(nid, NR_UNEVICTABLE)),
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nid, K(node_page_state(nid, NR_MLOCK)));
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#ifdef CONFIG_HIGHMEM
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n += sprintf(buf + n,
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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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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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n += sprintf(buf + n,
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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 Shmem: %8lu kB\n"
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"Node %d KernelStack: %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 WritebackTmp: %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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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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"Node %d AnonHugePages: %8lu kB\n"
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#endif
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,
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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_SHMEM)),
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nid, node_page_state(nid, NR_KERNEL_STACK) *
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THREAD_SIZE / 1024,
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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_WRITEBACK_TEMP)),
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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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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))
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, nid,
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K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) *
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HPAGE_PMD_NR));
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#else
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nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
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#endif
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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 DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
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static ssize_t node_read_numastat(struct device *dev,
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struct device_attribute *attr, 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 DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
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static ssize_t node_read_vmstat(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int nid = dev->id;
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int i;
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int n = 0;
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for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
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n += sprintf(buf+n, "%s %lu\n", vmstat_text[i],
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node_page_state(nid, i));
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return n;
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}
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static DEVICE_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL);
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static ssize_t node_read_distance(struct device *dev,
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struct device_attribute *attr, 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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/*
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* buf is currently PAGE_SIZE in length and each node needs 4 chars
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* at the most (distance + space or newline).
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*/
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BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);
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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 DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL);
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#ifdef CONFIG_HUGETLBFS
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/*
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* hugetlbfs per node attributes registration interface:
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* When/if hugetlb[fs] subsystem initializes [sometime after this module],
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* it will register its per node attributes for all online nodes with
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* memory. It will also call register_hugetlbfs_with_node(), below, to
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* register its attribute registration functions with this node driver.
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* Once these hooks have been initialized, the node driver will call into
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* the hugetlb module to [un]register attributes for hot-plugged nodes.
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*/
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static node_registration_func_t __hugetlb_register_node;
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static node_registration_func_t __hugetlb_unregister_node;
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static inline bool hugetlb_register_node(struct node *node)
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{
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if (__hugetlb_register_node &&
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node_state(node->dev.id, N_MEMORY)) {
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__hugetlb_register_node(node);
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return true;
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}
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return false;
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}
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static inline void hugetlb_unregister_node(struct node *node)
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{
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if (__hugetlb_unregister_node)
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__hugetlb_unregister_node(node);
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}
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void register_hugetlbfs_with_node(node_registration_func_t doregister,
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node_registration_func_t unregister)
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{
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__hugetlb_register_node = doregister;
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__hugetlb_unregister_node = unregister;
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}
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#else
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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
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static void node_device_release(struct device *dev)
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{
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struct node *node = to_node(dev);
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#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
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/*
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* We schedule the work only when a memory section is
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* onlined/offlined on this node. When we come here,
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* all the memory on this node has been offlined,
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* so we won't enqueue new work to this work.
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*
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* The work is using node->node_work, so we should
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* flush work before freeing the memory.
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*/
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flush_work(&node->node_work);
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#endif
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kfree(node);
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}
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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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static 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->dev.id = num;
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node->dev.bus = &node_subsys;
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node->dev.release = node_device_release;
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error = device_register(&node->dev);
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if (!error){
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device_create_file(&node->dev, &dev_attr_cpumap);
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device_create_file(&node->dev, &dev_attr_cpulist);
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device_create_file(&node->dev, &dev_attr_meminfo);
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device_create_file(&node->dev, &dev_attr_numastat);
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device_create_file(&node->dev, &dev_attr_distance);
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device_create_file(&node->dev, &dev_attr_vmstat);
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scan_unevictable_register_node(node);
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hugetlb_register_node(node);
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compaction_register_node(node);
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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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device_remove_file(&node->dev, &dev_attr_cpumap);
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device_remove_file(&node->dev, &dev_attr_cpulist);
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device_remove_file(&node->dev, &dev_attr_meminfo);
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device_remove_file(&node->dev, &dev_attr_numastat);
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device_remove_file(&node->dev, &dev_attr_distance);
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device_remove_file(&node->dev, &dev_attr_vmstat);
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scan_unevictable_unregister_node(node);
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hugetlb_unregister_node(node); /* no-op, if memoryless node */
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device_unregister(&node->dev);
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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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int ret;
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struct device *obj;
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if (!node_online(nid))
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return 0;
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obj = get_cpu_device(cpu);
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if (!obj)
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return 0;
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ret = sysfs_create_link(&node_devices[nid]->dev.kobj,
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&obj->kobj,
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kobject_name(&obj->kobj));
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if (ret)
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return ret;
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return sysfs_create_link(&obj->kobj,
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&node_devices[nid]->dev.kobj,
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kobject_name(&node_devices[nid]->dev.kobj));
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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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struct device *obj;
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if (!node_online(nid))
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return 0;
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obj = get_cpu_device(cpu);
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if (!obj)
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return 0;
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sysfs_remove_link(&node_devices[nid]->dev.kobj,
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kobject_name(&obj->kobj));
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sysfs_remove_link(&obj->kobj,
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kobject_name(&node_devices[nid]->dev.kobj));
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return 0;
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}
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#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
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#define page_initialized(page) (page->lru.next)
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static int get_nid_for_pfn(unsigned long pfn)
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{
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struct page *page;
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if (!pfn_valid_within(pfn))
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return -1;
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page = pfn_to_page(pfn);
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if (!page_initialized(page))
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return -1;
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return pfn_to_nid(pfn);
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}
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/* register memory section under specified node if it spans that node */
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int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
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{
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int ret;
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unsigned long pfn, sect_start_pfn, sect_end_pfn;
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if (!mem_blk)
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return -EFAULT;
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if (!node_online(nid))
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return 0;
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sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
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sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr);
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sect_end_pfn += PAGES_PER_SECTION - 1;
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for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
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int page_nid;
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page_nid = get_nid_for_pfn(pfn);
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if (page_nid < 0)
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continue;
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if (page_nid != nid)
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continue;
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ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
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&mem_blk->dev.kobj,
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kobject_name(&mem_blk->dev.kobj));
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if (ret)
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return ret;
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return sysfs_create_link_nowarn(&mem_blk->dev.kobj,
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&node_devices[nid]->dev.kobj,
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kobject_name(&node_devices[nid]->dev.kobj));
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}
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/* mem section does not span the specified node */
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return 0;
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}
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/* unregister memory section under all nodes that it spans */
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int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
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unsigned long phys_index)
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{
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NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
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unsigned long pfn, sect_start_pfn, sect_end_pfn;
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if (!mem_blk) {
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NODEMASK_FREE(unlinked_nodes);
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return -EFAULT;
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}
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if (!unlinked_nodes)
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return -ENOMEM;
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nodes_clear(*unlinked_nodes);
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sect_start_pfn = section_nr_to_pfn(phys_index);
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sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
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for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
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int nid;
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nid = get_nid_for_pfn(pfn);
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if (nid < 0)
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continue;
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if (!node_online(nid))
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continue;
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if (node_test_and_set(nid, *unlinked_nodes))
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continue;
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sysfs_remove_link(&node_devices[nid]->dev.kobj,
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kobject_name(&mem_blk->dev.kobj));
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sysfs_remove_link(&mem_blk->dev.kobj,
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kobject_name(&node_devices[nid]->dev.kobj));
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}
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NODEMASK_FREE(unlinked_nodes);
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return 0;
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}
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static int link_mem_sections(int nid)
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{
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unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
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unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
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unsigned long pfn;
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struct memory_block *mem_blk = NULL;
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int err = 0;
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for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
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unsigned long section_nr = pfn_to_section_nr(pfn);
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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;
|
|
}
|
|
|
|
#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);
|
|
}
|
|
|
|
static void init_node_hugetlb_work(int nid)
|
|
{
|
|
INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work);
|
|
}
|
|
|
|
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;
|
|
}
|
|
#endif /* CONFIG_HUGETLBFS */
|
|
#else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */
|
|
|
|
static int link_mem_sections(int nid) { return 0; }
|
|
#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;
|
|
}
|
|
|
|
static void init_node_hugetlb_work(int nid) { }
|
|
|
|
#endif
|
|
|
|
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];
|
|
|
|
node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
|
|
if (!node_devices[nid])
|
|
return -ENOMEM;
|
|
|
|
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);
|
|
}
|
|
|
|
/* link memory sections under this node */
|
|
error = link_mem_sections(nid);
|
|
|
|
/* initialize work queue for memory hot plug */
|
|
init_node_hugetlb_work(nid);
|
|
}
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
void unregister_one_node(int nid)
|
|
{
|
|
unregister_node(node_devices[nid]);
|
|
node_devices[nid] = NULL;
|
|
}
|
|
|
|
/*
|
|
* node states attributes
|
|
*/
|
|
|
|
static ssize_t print_nodes_state(enum node_states state, char *buf)
|
|
{
|
|
int n;
|
|
|
|
n = nodelist_scnprintf(buf, PAGE_SIZE-2, node_states[state]);
|
|
buf[n++] = '\n';
|
|
buf[n] = '\0';
|
|
return n;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
#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
|
|
#ifdef CONFIG_MOVABLE_NODE
|
|
[N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
|
|
#endif
|
|
[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
|
|
#ifdef CONFIG_MOVABLE_NODE
|
|
&node_state_attr[N_MEMORY].attr.attr,
|
|
#endif
|
|
&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;
|
|
}
|
|
postcore_initcall(register_node_type);
|