![Miklos Szeredi](/assets/img/avatar_default.png)
Fuse will use temporary buffers to write back dirty data from memory mappings (normal writes are done synchronously). This is needed, because there cannot be any guarantee about the time in which a write will complete. By using temporary buffers, from the MM's point if view the page is written back immediately. If the writeout was due to memory pressure, this effectively migrates data from a full zone to a less full zone. This patch adds a new counter (NR_WRITEBACK_TEMP) for the number of pages used as temporary buffers. [Lee.Schermerhorn@hp.com: add vmstat_text for NR_WRITEBACK_TEMP] Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Christoph Lameter <clameter@sgi.com> Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
346 lines
8.8 KiB
C
346 lines
8.8 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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#include <linux/device.h>
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static struct sysdev_class node_class = {
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.name = "node",
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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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{
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struct node *node_dev = to_node(dev);
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node_to_cpumask_ptr(mask, 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. */
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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 sys_device *dev, 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 sys_device *dev, 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 SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
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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, 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 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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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_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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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_cpulist);
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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_cpulist);
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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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/*
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* node states attributes
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*/
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static ssize_t print_nodes_state(enum node_states state, char *buf)
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{
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int n;
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n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
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if (n > 0 && PAGE_SIZE > n + 1) {
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*(buf + n++) = '\n';
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*(buf + n++) = '\0';
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}
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return n;
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}
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static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
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{
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return print_nodes_state(N_POSSIBLE, buf);
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}
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static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
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{
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return print_nodes_state(N_ONLINE, buf);
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}
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static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
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char *buf)
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{
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return print_nodes_state(N_NORMAL_MEMORY, buf);
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}
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static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
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{
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return print_nodes_state(N_CPU, buf);
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}
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static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
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static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
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static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
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NULL);
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static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
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#ifdef CONFIG_HIGHMEM
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static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
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char *buf)
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{
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return print_nodes_state(N_HIGH_MEMORY, buf);
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}
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static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
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NULL);
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#endif
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struct sysdev_class_attribute *node_state_attr[] = {
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&attr_possible,
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&attr_online,
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&attr_has_normal_memory,
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#ifdef CONFIG_HIGHMEM
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&attr_has_high_memory,
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#endif
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&attr_has_cpu,
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};
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static int node_states_init(void)
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{
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int i;
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int err = 0;
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for (i = 0; i < NR_NODE_STATES; i++) {
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int ret;
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ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
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if (!err)
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err = ret;
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}
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return err;
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}
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static int __init register_node_type(void)
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{
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int ret;
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ret = sysdev_class_register(&node_class);
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if (!ret)
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ret = node_states_init();
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/*
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* Note: we're not going to unregister the node class if we fail
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* to register the node state class attribute files.
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*/
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return ret;
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}
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postcore_initcall(register_node_type);
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