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drivers/base/node.c
17.5 KB
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/* * drivers/base/node.c - basic Node class support */ #include <linux/sysdev.h> #include <linux/module.h> #include <linux/init.h> #include <linux/mm.h> |
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#include <linux/memory.h> |
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#include <linux/vmstat.h> |
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#include <linux/node.h> #include <linux/hugetlb.h> |
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#include <linux/compaction.h> |
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#include <linux/cpumask.h> #include <linux/topology.h> #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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|
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static struct sysdev_class_attribute *node_state_attrs[]; |
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static struct sysdev_class node_class = { |
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.name = "node", |
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.attrs = node_state_attrs, |
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}; |
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static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf) |
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{ struct node *node_dev = to_node(dev); |
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const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id); |
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int len; |
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/* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */ BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1)); |
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|
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len = type? |
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cpulist_scnprintf(buf, PAGE_SIZE-2, mask) : cpumask_scnprintf(buf, PAGE_SIZE-2, mask); |
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buf[len++] = ' '; buf[len] = '\0'; |
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return len; } |
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static inline ssize_t node_read_cpumask(struct sys_device *dev, struct sysdev_attribute *attr, char *buf) |
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{ return node_read_cpumap(dev, 0, buf); } |
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static inline ssize_t node_read_cpulist(struct sys_device *dev, struct sysdev_attribute *attr, char *buf) |
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{ return node_read_cpumap(dev, 1, buf); } static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); static SYSDEV_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 sys_device * dev, struct sysdev_attribute *attr, char * buf) |
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{ int n; int nid = dev->id; 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 " "Node %d MemFree: %8lu kB " "Node %d MemUsed: %8lu kB " "Node %d Active: %8lu kB " "Node %d Inactive: %8lu kB " "Node %d Active(anon): %8lu kB " "Node %d Inactive(anon): %8lu kB " "Node %d Active(file): %8lu kB " "Node %d Inactive(file): %8lu kB " |
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"Node %d Unevictable: %8lu kB " |
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"Node %d Mlocked: %8lu kB ", nid, K(i.totalram), nid, K(i.freeram), nid, K(i.totalram - i.freeram), nid, K(node_page_state(nid, NR_ACTIVE_ANON) + node_page_state(nid, NR_ACTIVE_FILE)), nid, K(node_page_state(nid, NR_INACTIVE_ANON) + node_page_state(nid, NR_INACTIVE_FILE)), nid, K(node_page_state(nid, NR_ACTIVE_ANON)), nid, K(node_page_state(nid, NR_INACTIVE_ANON)), nid, K(node_page_state(nid, NR_ACTIVE_FILE)), nid, K(node_page_state(nid, NR_INACTIVE_FILE)), nid, K(node_page_state(nid, NR_UNEVICTABLE)), 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 " "Node %d HighFree: %8lu kB " "Node %d LowTotal: %8lu kB " |
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"Node %d LowFree: %8lu kB ", nid, K(i.totalhigh), nid, K(i.freehigh), nid, K(i.totalram - i.totalhigh), 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 " "Node %d Writeback: %8lu kB " "Node %d FilePages: %8lu kB " "Node %d Mapped: %8lu kB " "Node %d AnonPages: %8lu kB " |
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"Node %d Shmem: %8lu kB " |
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"Node %d KernelStack: %8lu kB " |
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"Node %d PageTables: %8lu kB " "Node %d NFS_Unstable: %8lu kB " "Node %d Bounce: %8lu kB " "Node %d WritebackTmp: %8lu kB " "Node %d Slab: %8lu kB " "Node %d SReclaimable: %8lu kB " |
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"Node %d SUnreclaim: %8lu kB " #ifdef CONFIG_TRANSPARENT_HUGEPAGE "Node %d AnonHugePages: %8lu kB " #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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#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
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nid, K(node_page_state(nid, NR_ANON_PAGES) |
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+ node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) * |
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HPAGE_PMD_NR), #else nid, K(node_page_state(nid, NR_ANON_PAGES)), |
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#endif |
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nid, K(node_page_state(nid, NR_SHMEM)), |
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nid, node_page_state(nid, NR_KERNEL_STACK) * 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) + node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), 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, K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) * |
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HPAGE_PMD_NR)); #else 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); return n; } #undef K static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); |
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static ssize_t node_read_numastat(struct sys_device * dev, struct sysdev_attribute *attr, char * buf) |
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{ |
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return sprintf(buf, "numa_hit %lu " "numa_miss %lu " "numa_foreign %lu " "interleave_hit %lu " "local_node %lu " "other_node %lu ", |
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node_page_state(dev->id, NUMA_HIT), node_page_state(dev->id, NUMA_MISS), node_page_state(dev->id, NUMA_FOREIGN), node_page_state(dev->id, NUMA_INTERLEAVE_HIT), node_page_state(dev->id, NUMA_LOCAL), node_page_state(dev->id, NUMA_OTHER)); |
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} static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); |
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static ssize_t node_read_vmstat(struct sys_device *dev, struct sysdev_attribute *attr, char *buf) { int nid = dev->id; |
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int i; int n = 0; for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) n += sprintf(buf+n, "%s %lu ", vmstat_text[i], node_page_state(nid, i)); return n; |
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} static SYSDEV_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL); |
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static ssize_t node_read_distance(struct sys_device * dev, struct sysdev_attribute *attr, char * buf) |
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{ int nid = dev->id; int len = 0; int i; |
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/* * 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); |
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for_each_online_node(i) len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); len += sprintf(buf + len, " "); return len; } static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL); |
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#ifdef CONFIG_HUGETLBFS /* * hugetlbfs per node attributes registration interface: * 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 * memory. It will also call register_hugetlbfs_with_node(), below, to |
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* 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; |
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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->sysdev.id, N_HIGH_MEMORY)) { |
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__hugetlb_register_node(node); |
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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); } void register_hugetlbfs_with_node(node_registration_func_t doregister, node_registration_func_t unregister) { __hugetlb_register_node = doregister; __hugetlb_unregister_node = unregister; } #else static inline void hugetlb_register_node(struct node *node) {} static inline void hugetlb_unregister_node(struct node *node) {} #endif |
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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. * * Initialize and register the node device. */ |
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int register_node(struct node *node, int num, struct node *parent) |
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{ 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); |
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sysdev_create_file(&node->sysdev, &attr_cpulist); |
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sysdev_create_file(&node->sysdev, &attr_meminfo); sysdev_create_file(&node->sysdev, &attr_numastat); sysdev_create_file(&node->sysdev, &attr_distance); |
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sysdev_create_file(&node->sysdev, &attr_vmstat); |
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scan_unevictable_register_node(node); |
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|
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hugetlb_register_node(node); |
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compaction_register_node(node); |
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} 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) { sysdev_remove_file(&node->sysdev, &attr_cpumap); |
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sysdev_remove_file(&node->sysdev, &attr_cpulist); |
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sysdev_remove_file(&node->sysdev, &attr_meminfo); sysdev_remove_file(&node->sysdev, &attr_numastat); sysdev_remove_file(&node->sysdev, &attr_distance); |
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sysdev_remove_file(&node->sysdev, &attr_vmstat); |
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|
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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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|
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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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/* * register cpu under node */ int register_cpu_under_node(unsigned int cpu, unsigned int nid) { |
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int ret; |
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struct sys_device *obj; |
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|
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if (!node_online(nid)) return 0; obj = get_cpu_sysdev(cpu); if (!obj) return 0; |
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ret = sysfs_create_link(&node_devices[nid].sysdev.kobj, |
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&obj->kobj, kobject_name(&obj->kobj)); |
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if (ret) return ret; return sysfs_create_link(&obj->kobj, &node_devices[nid].sysdev.kobj, kobject_name(&node_devices[nid].sysdev.kobj)); |
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} int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) { |
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struct sys_device *obj; if (!node_online(nid)) return 0; obj = get_cpu_sysdev(cpu); if (!obj) return 0; sysfs_remove_link(&node_devices[nid].sysdev.kobj, kobject_name(&obj->kobj)); |
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sysfs_remove_link(&obj->kobj, kobject_name(&node_devices[nid].sysdev.kobj)); |
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|
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return 0; } |
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#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE #define page_initialized(page) (page->lru.next) static int get_nid_for_pfn(unsigned long pfn) { struct page *page; if (!pfn_valid_within(pfn)) return -1; page = pfn_to_page(pfn); if (!page_initialized(page)) return -1; return pfn_to_nid(pfn); } /* register memory section under specified node if it spans that node */ int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) { |
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int ret; |
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unsigned long pfn, sect_start_pfn, sect_end_pfn; if (!mem_blk) return -EFAULT; if (!node_online(nid)) return 0; |
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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; |
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for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { int page_nid; page_nid = get_nid_for_pfn(pfn); if (page_nid < 0) continue; if (page_nid != nid) continue; |
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ret = sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj, |
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&mem_blk->sysdev.kobj, kobject_name(&mem_blk->sysdev.kobj)); |
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if (ret) return ret; return sysfs_create_link_nowarn(&mem_blk->sysdev.kobj, &node_devices[nid].sysdev.kobj, kobject_name(&node_devices[nid].sysdev.kobj)); |
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} /* mem section does not span the specified node */ return 0; } /* unregister memory section under all nodes that it spans */ |
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int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, 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) { NODEMASK_FREE(unlinked_nodes); |
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return -EFAULT; |
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} if (!unlinked_nodes) return -ENOMEM; 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; 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); if (nid < 0) continue; if (!node_online(nid)) continue; |
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if (node_test_and_set(nid, *unlinked_nodes)) |
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continue; sysfs_remove_link(&node_devices[nid].sysdev.kobj, kobject_name(&mem_blk->sysdev.kobj)); |
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sysfs_remove_link(&mem_blk->sysdev.kobj, kobject_name(&node_devices[nid].sysdev.kobj)); |
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} |
9ae49fab2 mm: slab-allocate... |
463 |
NODEMASK_FREE(unlinked_nodes); |
c04fc586c mm: show node to ... |
464 465 466 467 468 469 470 471 |
return 0; } static int link_mem_sections(int nid) { unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; unsigned long pfn; |
63d027a63 driver core: Conv... |
472 |
struct memory_block *mem_blk = NULL; |
c04fc586c mm: show node to ... |
473 474 475 476 477 |
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; |
c04fc586c mm: show node to ... |
478 479 480 481 482 |
int ret; if (!present_section_nr(section_nr)) continue; mem_sect = __nr_to_section(section_nr); |
63d027a63 driver core: Conv... |
483 |
mem_blk = find_memory_block_hinted(mem_sect, mem_blk); |
c04fc586c mm: show node to ... |
484 485 486 487 488 |
ret = register_mem_sect_under_node(mem_blk, nid); if (!err) err = ret; /* discard ref obtained in find_memory_block() */ |
c04fc586c mm: show node to ... |
489 |
} |
63d027a63 driver core: Conv... |
490 491 492 |
if (mem_blk) kobject_put(&mem_blk->sysdev.kobj); |
c04fc586c mm: show node to ... |
493 494 |
return err; } |
4faf8d950 hugetlb: handle m... |
495 |
|
39da08cb0 hugetlb: offload ... |
496 |
#ifdef CONFIG_HUGETLBFS |
4faf8d950 hugetlb: handle m... |
497 498 499 500 |
/* * Handle per node hstate attribute [un]registration on transistions * to/from memoryless state. */ |
39da08cb0 hugetlb: offload ... |
501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 |
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); } |
4faf8d950 hugetlb: handle m... |
521 522 523 524 525 526 527 528 |
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) { |
39da08cb0 hugetlb: offload ... |
529 530 531 532 533 534 |
case MEM_ONLINE: case MEM_OFFLINE: /* * offload per node hstate [un]registration to a work thread * when transitioning to/from memoryless state. */ |
4faf8d950 hugetlb: handle m... |
535 |
if (nid != NUMA_NO_NODE) |
39da08cb0 hugetlb: offload ... |
536 |
schedule_work(&node_devices[nid].node_work); |
4faf8d950 hugetlb: handle m... |
537 |
break; |
39da08cb0 hugetlb: offload ... |
538 |
|
4faf8d950 hugetlb: handle m... |
539 540 541 542 543 544 545 546 547 548 |
case MEM_GOING_ONLINE: case MEM_GOING_OFFLINE: case MEM_CANCEL_ONLINE: case MEM_CANCEL_OFFLINE: default: break; } return NOTIFY_OK; } |
39da08cb0 hugetlb: offload ... |
549 550 |
#endif /* CONFIG_HUGETLBFS */ #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */ |
c04fc586c mm: show node to ... |
551 |
static int link_mem_sections(int nid) { return 0; } |
39da08cb0 hugetlb: offload ... |
552 |
#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
4faf8d950 hugetlb: handle m... |
553 |
|
39da08cb0 hugetlb: offload ... |
554 555 |
#if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \ !defined(CONFIG_HUGETLBFS) |
4faf8d950 hugetlb: handle m... |
556 557 558 559 560 |
static inline int node_memory_callback(struct notifier_block *self, unsigned long action, void *arg) { return NOTIFY_OK; } |
39da08cb0 hugetlb: offload ... |
561 562 563 564 |
static void init_node_hugetlb_work(int nid) { } #endif |
c04fc586c mm: show node to ... |
565 |
|
0fc44159b [PATCH] Register ... |
566 567 568 |
int register_one_node(int nid) { int error = 0; |
76b67ed9d [PATCH] node hotp... |
569 |
int cpu; |
0fc44159b [PATCH] Register ... |
570 571 572 573 574 575 576 577 578 |
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); |
76b67ed9d [PATCH] node hotp... |
579 580 581 582 583 584 |
/* link cpu under this node */ for_each_present_cpu(cpu) { if (cpu_to_node(cpu) == nid) register_cpu_under_node(cpu, nid); } |
c04fc586c mm: show node to ... |
585 586 587 |
/* link memory sections under this node */ error = link_mem_sections(nid); |
39da08cb0 hugetlb: offload ... |
588 589 590 |
/* initialize work queue for memory hot plug */ init_node_hugetlb_work(nid); |
0fc44159b [PATCH] Register ... |
591 592 593 594 595 596 597 598 599 600 |
} return error; } void unregister_one_node(int nid) { unregister_node(&node_devices[nid]); } |
bde631a51 mm: add node stat... |
601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 |
/* * node states attributes */ static ssize_t print_nodes_state(enum node_states state, char *buf) { int n; n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]); if (n > 0 && PAGE_SIZE > n + 1) { *(buf + n++) = ' '; *(buf + n++) = '\0'; } return n; } |
b15f562fc sysdev: Convert n... |
617 618 619 620 |
struct node_attr { struct sysdev_class_attribute attr; enum node_states state; }; |
bde631a51 mm: add node stat... |
621 |
|
b15f562fc sysdev: Convert n... |
622 623 |
static ssize_t show_node_state(struct sysdev_class *class, struct sysdev_class_attribute *attr, char *buf) |
bde631a51 mm: add node stat... |
624 |
{ |
b15f562fc sysdev: Convert n... |
625 626 |
struct node_attr *na = container_of(attr, struct node_attr, attr); return print_nodes_state(na->state, buf); |
bde631a51 mm: add node stat... |
627 |
} |
b15f562fc sysdev: Convert n... |
628 629 |
#define _NODE_ATTR(name, state) \ { _SYSDEV_CLASS_ATTR(name, 0444, show_node_state, NULL), state } |
bde631a51 mm: add node stat... |
630 |
|
b15f562fc sysdev: Convert n... |
631 632 633 634 635 |
static struct node_attr node_state_attr[] = { _NODE_ATTR(possible, N_POSSIBLE), _NODE_ATTR(online, N_ONLINE), _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), _NODE_ATTR(has_cpu, N_CPU), |
bde631a51 mm: add node stat... |
636 |
#ifdef CONFIG_HIGHMEM |
b15f562fc sysdev: Convert n... |
637 |
_NODE_ATTR(has_high_memory, N_HIGH_MEMORY), |
bde631a51 mm: add node stat... |
638 |
#endif |
bde631a51 mm: add node stat... |
639 |
}; |
3701cde6e sysdev: Use sysde... |
640 641 642 643 644 645 646 647 648 649 |
static struct sysdev_class_attribute *node_state_attrs[] = { &node_state_attr[0].attr, &node_state_attr[1].attr, &node_state_attr[2].attr, &node_state_attr[3].attr, #ifdef CONFIG_HIGHMEM &node_state_attr[4].attr, #endif NULL }; |
bde631a51 mm: add node stat... |
650 |
|
4faf8d950 hugetlb: handle m... |
651 |
#define NODE_CALLBACK_PRI 2 /* lower than SLAB */ |
4b45099b7 [PATCH] Driver co... |
652 |
static int __init register_node_type(void) |
1da177e4c Linux-2.6.12-rc2 |
653 |
{ |
bde631a51 mm: add node stat... |
654 |
int ret; |
3701cde6e sysdev: Use sysde... |
655 656 |
BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); |
bde631a51 mm: add node stat... |
657 |
ret = sysdev_class_register(&node_class); |
4faf8d950 hugetlb: handle m... |
658 |
if (!ret) { |
4faf8d950 hugetlb: handle m... |
659 660 661 |
hotplug_memory_notifier(node_memory_callback, NODE_CALLBACK_PRI); } |
bde631a51 mm: add node stat... |
662 663 664 665 666 667 |
/* * Note: we're not going to unregister the node class if we fail * to register the node state class attribute files. */ return ret; |
1da177e4c Linux-2.6.12-rc2 |
668 669 |
} postcore_initcall(register_node_type); |