*
* Manages VM statistics
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
+ *
+ * zoned VM statistics
+ * Copyright (C) 2006 Silicon Graphics, Inc.,
+ * Christoph Lameter <christoph@lameter.com>
*/
-
-#include <linux/config.h>
+#include <linux/fs.h>
#include <linux/mm.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/cpu.h>
+#include <linux/vmstat.h>
+#include <linux/sched.h>
+
+#ifdef CONFIG_VM_EVENT_COUNTERS
+DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}};
+EXPORT_PER_CPU_SYMBOL(vm_event_states);
+
+static void sum_vm_events(unsigned long *ret, const struct cpumask *cpumask)
+{
+ int cpu;
+ int i;
+
+ memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long));
+
+ for_each_cpu_mask_nr(cpu, *cpumask) {
+ struct vm_event_state *this = &per_cpu(vm_event_states, cpu);
+
+ for (i = 0; i < NR_VM_EVENT_ITEMS; i++)
+ ret[i] += this->event[i];
+ }
+}
/*
- * Accumulate the page_state information across all CPUs.
+ * Accumulate the vm event counters across all CPUs.
* The result is unavoidably approximate - it can change
* during and after execution of this function.
+*/
+void all_vm_events(unsigned long *ret)
+{
+ get_online_cpus();
+ sum_vm_events(ret, cpu_online_mask);
+ put_online_cpus();
+}
+EXPORT_SYMBOL_GPL(all_vm_events);
+
+#ifdef CONFIG_HOTPLUG
+/*
+ * Fold the foreign cpu events into our own.
+ *
+ * This is adding to the events on one processor
+ * but keeps the global counts constant.
*/
-DEFINE_PER_CPU(struct page_state, page_states) = {0};
+void vm_events_fold_cpu(int cpu)
+{
+ struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu);
+ int i;
+
+ for (i = 0; i < NR_VM_EVENT_ITEMS; i++) {
+ count_vm_events(i, fold_state->event[i]);
+ fold_state->event[i] = 0;
+ }
+}
+#endif /* CONFIG_HOTPLUG */
+
+#endif /* CONFIG_VM_EVENT_COUNTERS */
+
+/*
+ * Manage combined zone based / global counters
+ *
+ * vm_stat contains the global counters
+ */
+atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
+EXPORT_SYMBOL(vm_stat);
-atomic_t nr_pagecache = ATOMIC_INIT(0);
-EXPORT_SYMBOL(nr_pagecache);
#ifdef CONFIG_SMP
-DEFINE_PER_CPU(long, nr_pagecache_local) = 0;
-#endif
-static void __get_page_state(struct page_state *ret, int nr, cpumask_t *cpumask)
+static int calculate_threshold(struct zone *zone)
{
- unsigned cpu;
+ int threshold;
+ int mem; /* memory in 128 MB units */
+
+ /*
+ * The threshold scales with the number of processors and the amount
+ * of memory per zone. More memory means that we can defer updates for
+ * longer, more processors could lead to more contention.
+ * fls() is used to have a cheap way of logarithmic scaling.
+ *
+ * Some sample thresholds:
+ *
+ * Threshold Processors (fls) Zonesize fls(mem+1)
+ * ------------------------------------------------------------------
+ * 8 1 1 0.9-1 GB 4
+ * 16 2 2 0.9-1 GB 4
+ * 20 2 2 1-2 GB 5
+ * 24 2 2 2-4 GB 6
+ * 28 2 2 4-8 GB 7
+ * 32 2 2 8-16 GB 8
+ * 4 2 2 <128M 1
+ * 30 4 3 2-4 GB 5
+ * 48 4 3 8-16 GB 8
+ * 32 8 4 1-2 GB 4
+ * 32 8 4 0.9-1GB 4
+ * 10 16 5 <128M 1
+ * 40 16 5 900M 4
+ * 70 64 7 2-4 GB 5
+ * 84 64 7 4-8 GB 6
+ * 108 512 9 4-8 GB 6
+ * 125 1024 10 8-16 GB 8
+ * 125 1024 10 16-32 GB 9
+ */
+
+ mem = zone->present_pages >> (27 - PAGE_SHIFT);
+
+ threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem));
+
+ /*
+ * Maximum threshold is 125
+ */
+ threshold = min(125, threshold);
+
+ return threshold;
+}
- memset(ret, 0, nr * sizeof(unsigned long));
- cpus_and(*cpumask, *cpumask, cpu_online_map);
+/*
+ * Refresh the thresholds for each zone.
+ */
+static void refresh_zone_stat_thresholds(void)
+{
+ struct zone *zone;
+ int cpu;
+ int threshold;
- for_each_cpu_mask(cpu, *cpumask) {
- unsigned long *in;
- unsigned long *out;
- unsigned off;
- unsigned next_cpu;
+ for_each_zone(zone) {
- in = (unsigned long *)&per_cpu(page_states, cpu);
+ if (!zone->present_pages)
+ continue;
- next_cpu = next_cpu(cpu, *cpumask);
- if (likely(next_cpu < NR_CPUS))
- prefetch(&per_cpu(page_states, next_cpu));
+ threshold = calculate_threshold(zone);
- out = (unsigned long *)ret;
- for (off = 0; off < nr; off++)
- *out++ += *in++;
+ for_each_online_cpu(cpu)
+ zone_pcp(zone, cpu)->stat_threshold = threshold;
}
}
-void get_page_state_node(struct page_state *ret, int node)
+/*
+ * For use when we know that interrupts are disabled.
+ */
+void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
+ int delta)
{
- int nr;
- cpumask_t mask = node_to_cpumask(node);
+ struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id());
+ s8 *p = pcp->vm_stat_diff + item;
+ long x;
- nr = offsetof(struct page_state, GET_PAGE_STATE_LAST);
- nr /= sizeof(unsigned long);
+ x = delta + *p;
- __get_page_state(ret, nr+1, &mask);
+ if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) {
+ zone_page_state_add(x, zone, item);
+ x = 0;
+ }
+ *p = x;
}
+EXPORT_SYMBOL(__mod_zone_page_state);
-void get_page_state(struct page_state *ret)
+/*
+ * For an unknown interrupt state
+ */
+void mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
+ int delta)
{
- int nr;
- cpumask_t mask = CPU_MASK_ALL;
-
- nr = offsetof(struct page_state, GET_PAGE_STATE_LAST);
- nr /= sizeof(unsigned long);
+ unsigned long flags;
- __get_page_state(ret, nr + 1, &mask);
+ local_irq_save(flags);
+ __mod_zone_page_state(zone, item, delta);
+ local_irq_restore(flags);
}
+EXPORT_SYMBOL(mod_zone_page_state);
-void get_full_page_state(struct page_state *ret)
+/*
+ * Optimized increment and decrement functions.
+ *
+ * These are only for a single page and therefore can take a struct page *
+ * argument instead of struct zone *. This allows the inclusion of the code
+ * generated for page_zone(page) into the optimized functions.
+ *
+ * No overflow check is necessary and therefore the differential can be
+ * incremented or decremented in place which may allow the compilers to
+ * generate better code.
+ * The increment or decrement is known and therefore one boundary check can
+ * be omitted.
+ *
+ * NOTE: These functions are very performance sensitive. Change only
+ * with care.
+ *
+ * Some processors have inc/dec instructions that are atomic vs an interrupt.
+ * However, the code must first determine the differential location in a zone
+ * based on the processor number and then inc/dec the counter. There is no
+ * guarantee without disabling preemption that the processor will not change
+ * in between and therefore the atomicity vs. interrupt cannot be exploited
+ * in a useful way here.
+ */
+void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
{
- cpumask_t mask = CPU_MASK_ALL;
+ struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id());
+ s8 *p = pcp->vm_stat_diff + item;
+
+ (*p)++;
- __get_page_state(ret, sizeof(*ret) / sizeof(unsigned long), &mask);
+ if (unlikely(*p > pcp->stat_threshold)) {
+ int overstep = pcp->stat_threshold / 2;
+
+ zone_page_state_add(*p + overstep, zone, item);
+ *p = -overstep;
+ }
}
-unsigned long read_page_state_offset(unsigned long offset)
+void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
{
- unsigned long ret = 0;
- int cpu;
+ __inc_zone_state(page_zone(page), item);
+}
+EXPORT_SYMBOL(__inc_zone_page_state);
+
+void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
+{
+ struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id());
+ s8 *p = pcp->vm_stat_diff + item;
+
+ (*p)--;
- for_each_online_cpu(cpu) {
- unsigned long in;
+ if (unlikely(*p < - pcp->stat_threshold)) {
+ int overstep = pcp->stat_threshold / 2;
- in = (unsigned long)&per_cpu(page_states, cpu) + offset;
- ret += *((unsigned long *)in);
+ zone_page_state_add(*p - overstep, zone, item);
+ *p = overstep;
}
- return ret;
}
-void __mod_page_state_offset(unsigned long offset, unsigned long delta)
+void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
{
- void *ptr;
+ __dec_zone_state(page_zone(page), item);
+}
+EXPORT_SYMBOL(__dec_zone_page_state);
+
+void inc_zone_state(struct zone *zone, enum zone_stat_item item)
+{
+ unsigned long flags;
- ptr = &__get_cpu_var(page_states);
- *(unsigned long *)(ptr + offset) += delta;
+ local_irq_save(flags);
+ __inc_zone_state(zone, item);
+ local_irq_restore(flags);
}
-EXPORT_SYMBOL(__mod_page_state_offset);
-void mod_page_state_offset(unsigned long offset, unsigned long delta)
+void inc_zone_page_state(struct page *page, enum zone_stat_item item)
{
unsigned long flags;
- void *ptr;
+ struct zone *zone;
+ zone = page_zone(page);
local_irq_save(flags);
- ptr = &__get_cpu_var(page_states);
- *(unsigned long *)(ptr + offset) += delta;
+ __inc_zone_state(zone, item);
local_irq_restore(flags);
}
-EXPORT_SYMBOL(mod_page_state_offset);
+EXPORT_SYMBOL(inc_zone_page_state);
-void __get_zone_counts(unsigned long *active, unsigned long *inactive,
- unsigned long *free, struct pglist_data *pgdat)
+void dec_zone_page_state(struct page *page, enum zone_stat_item item)
{
- struct zone *zones = pgdat->node_zones;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ __dec_zone_page_state(page, item);
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(dec_zone_page_state);
+
+/*
+ * Update the zone counters for one cpu.
+ *
+ * The cpu specified must be either the current cpu or a processor that
+ * is not online. If it is the current cpu then the execution thread must
+ * be pinned to the current cpu.
+ *
+ * Note that refresh_cpu_vm_stats strives to only access
+ * node local memory. The per cpu pagesets on remote zones are placed
+ * in the memory local to the processor using that pageset. So the
+ * loop over all zones will access a series of cachelines local to
+ * the processor.
+ *
+ * The call to zone_page_state_add updates the cachelines with the
+ * statistics in the remote zone struct as well as the global cachelines
+ * with the global counters. These could cause remote node cache line
+ * bouncing and will have to be only done when necessary.
+ */
+void refresh_cpu_vm_stats(int cpu)
+{
+ struct zone *zone;
int i;
+ int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, };
+
+ for_each_zone(zone) {
+ struct per_cpu_pageset *p;
- *active = 0;
- *inactive = 0;
- *free = 0;
- for (i = 0; i < MAX_NR_ZONES; i++) {
- *active += zones[i].nr_active;
- *inactive += zones[i].nr_inactive;
- *free += zones[i].free_pages;
+ if (!populated_zone(zone))
+ continue;
+
+ p = zone_pcp(zone, cpu);
+
+ for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
+ if (p->vm_stat_diff[i]) {
+ unsigned long flags;
+ int v;
+
+ local_irq_save(flags);
+ v = p->vm_stat_diff[i];
+ p->vm_stat_diff[i] = 0;
+ local_irq_restore(flags);
+ atomic_long_add(v, &zone->vm_stat[i]);
+ global_diff[i] += v;
+#ifdef CONFIG_NUMA
+ /* 3 seconds idle till flush */
+ p->expire = 3;
+#endif
+ }
+ cond_resched();
+#ifdef CONFIG_NUMA
+ /*
+ * Deal with draining the remote pageset of this
+ * processor
+ *
+ * Check if there are pages remaining in this pageset
+ * if not then there is nothing to expire.
+ */
+ if (!p->expire || !p->pcp.count)
+ continue;
+
+ /*
+ * We never drain zones local to this processor.
+ */
+ if (zone_to_nid(zone) == numa_node_id()) {
+ p->expire = 0;
+ continue;
+ }
+
+ p->expire--;
+ if (p->expire)
+ continue;
+
+ if (p->pcp.count)
+ drain_zone_pages(zone, &p->pcp);
+#endif
}
+
+ for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
+ if (global_diff[i])
+ atomic_long_add(global_diff[i], &vm_stat[i]);
}
-void get_zone_counts(unsigned long *active,
- unsigned long *inactive, unsigned long *free)
-{
- struct pglist_data *pgdat;
+#endif
- *active = 0;
- *inactive = 0;
- *free = 0;
- for_each_online_pgdat(pgdat) {
- unsigned long l, m, n;
- __get_zone_counts(&l, &m, &n, pgdat);
- *active += l;
- *inactive += m;
- *free += n;
+#ifdef CONFIG_NUMA
+/*
+ * zonelist = the list of zones passed to the allocator
+ * z = the zone from which the allocation occurred.
+ *
+ * Must be called with interrupts disabled.
+ */
+void zone_statistics(struct zone *preferred_zone, struct zone *z)
+{
+ if (z->zone_pgdat == preferred_zone->zone_pgdat) {
+ __inc_zone_state(z, NUMA_HIT);
+ } else {
+ __inc_zone_state(z, NUMA_MISS);
+ __inc_zone_state(preferred_zone, NUMA_FOREIGN);
}
+ if (z->node == numa_node_id())
+ __inc_zone_state(z, NUMA_LOCAL);
+ else
+ __inc_zone_state(z, NUMA_OTHER);
}
+#endif
#ifdef CONFIG_PROC_FS
-
+#include <linux/proc_fs.h>
#include <linux/seq_file.h>
+static char * const migratetype_names[MIGRATE_TYPES] = {
+ "Unmovable",
+ "Reclaimable",
+ "Movable",
+ "Reserve",
+ "Isolate",
+};
+
static void *frag_start(struct seq_file *m, loff_t *pos)
{
pg_data_t *pgdat;
{
}
-/*
- * This walks the free areas for each zone.
- */
-static int frag_show(struct seq_file *m, void *arg)
+/* Walk all the zones in a node and print using a callback */
+static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat,
+ void (*print)(struct seq_file *m, pg_data_t *, struct zone *))
{
- pg_data_t *pgdat = (pg_data_t *)arg;
struct zone *zone;
struct zone *node_zones = pgdat->node_zones;
unsigned long flags;
- int order;
for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
if (!populated_zone(zone))
continue;
spin_lock_irqsave(&zone->lock, flags);
- seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
- for (order = 0; order < MAX_ORDER; ++order)
- seq_printf(m, "%6lu ", zone->free_area[order].nr_free);
+ print(m, pgdat, zone);
spin_unlock_irqrestore(&zone->lock, flags);
+ }
+}
+
+static void frag_show_print(struct seq_file *m, pg_data_t *pgdat,
+ struct zone *zone)
+{
+ int order;
+
+ seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
+ for (order = 0; order < MAX_ORDER; ++order)
+ seq_printf(m, "%6lu ", zone->free_area[order].nr_free);
+ seq_putc(m, '\n');
+}
+
+/*
+ * This walks the free areas for each zone.
+ */
+static int frag_show(struct seq_file *m, void *arg)
+{
+ pg_data_t *pgdat = (pg_data_t *)arg;
+ walk_zones_in_node(m, pgdat, frag_show_print);
+ return 0;
+}
+
+static void pagetypeinfo_showfree_print(struct seq_file *m,
+ pg_data_t *pgdat, struct zone *zone)
+{
+ int order, mtype;
+
+ for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) {
+ seq_printf(m, "Node %4d, zone %8s, type %12s ",
+ pgdat->node_id,
+ zone->name,
+ migratetype_names[mtype]);
+ for (order = 0; order < MAX_ORDER; ++order) {
+ unsigned long freecount = 0;
+ struct free_area *area;
+ struct list_head *curr;
+
+ area = &(zone->free_area[order]);
+
+ list_for_each(curr, &area->free_list[mtype])
+ freecount++;
+ seq_printf(m, "%6lu ", freecount);
+ }
seq_putc(m, '\n');
}
+}
+
+/* Print out the free pages at each order for each migatetype */
+static int pagetypeinfo_showfree(struct seq_file *m, void *arg)
+{
+ int order;
+ pg_data_t *pgdat = (pg_data_t *)arg;
+
+ /* Print header */
+ seq_printf(m, "%-43s ", "Free pages count per migrate type at order");
+ for (order = 0; order < MAX_ORDER; ++order)
+ seq_printf(m, "%6d ", order);
+ seq_putc(m, '\n');
+
+ walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print);
+
return 0;
}
-struct seq_operations fragmentation_op = {
+static void pagetypeinfo_showblockcount_print(struct seq_file *m,
+ pg_data_t *pgdat, struct zone *zone)
+{
+ int mtype;
+ unsigned long pfn;
+ unsigned long start_pfn = zone->zone_start_pfn;
+ unsigned long end_pfn = start_pfn + zone->spanned_pages;
+ unsigned long count[MIGRATE_TYPES] = { 0, };
+
+ for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) {
+ struct page *page;
+
+ if (!pfn_valid(pfn))
+ continue;
+
+ page = pfn_to_page(pfn);
+#ifdef CONFIG_ARCH_FLATMEM_HAS_HOLES
+ /*
+ * Ordinarily, memory holes in flatmem still have a valid
+ * memmap for the PFN range. However, an architecture for
+ * embedded systems (e.g. ARM) can free up the memmap backing
+ * holes to save memory on the assumption the memmap is
+ * never used. The page_zone linkages are then broken even
+ * though pfn_valid() returns true. Skip the page if the
+ * linkages are broken. Even if this test passed, the impact
+ * is that the counters for the movable type are off but
+ * fragmentation monitoring is likely meaningless on small
+ * systems.
+ */
+ if (page_zone(page) != zone)
+ continue;
+#endif
+ mtype = get_pageblock_migratetype(page);
+
+ if (mtype < MIGRATE_TYPES)
+ count[mtype]++;
+ }
+
+ /* Print counts */
+ seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
+ for (mtype = 0; mtype < MIGRATE_TYPES; mtype++)
+ seq_printf(m, "%12lu ", count[mtype]);
+ seq_putc(m, '\n');
+}
+
+/* Print out the free pages at each order for each migratetype */
+static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg)
+{
+ int mtype;
+ pg_data_t *pgdat = (pg_data_t *)arg;
+
+ seq_printf(m, "\n%-23s", "Number of blocks type ");
+ for (mtype = 0; mtype < MIGRATE_TYPES; mtype++)
+ seq_printf(m, "%12s ", migratetype_names[mtype]);
+ seq_putc(m, '\n');
+ walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print);
+
+ return 0;
+}
+
+/*
+ * This prints out statistics in relation to grouping pages by mobility.
+ * It is expensive to collect so do not constantly read the file.
+ */
+static int pagetypeinfo_show(struct seq_file *m, void *arg)
+{
+ pg_data_t *pgdat = (pg_data_t *)arg;
+
+ /* check memoryless node */
+ if (!node_state(pgdat->node_id, N_HIGH_MEMORY))
+ return 0;
+
+ seq_printf(m, "Page block order: %d\n", pageblock_order);
+ seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages);
+ seq_putc(m, '\n');
+ pagetypeinfo_showfree(m, pgdat);
+ pagetypeinfo_showblockcount(m, pgdat);
+
+ return 0;
+}
+
+static const struct seq_operations fragmentation_op = {
.start = frag_start,
.next = frag_next,
.stop = frag_stop,
.show = frag_show,
};
-static char *vmstat_text[] = {
+static int fragmentation_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &fragmentation_op);
+}
+
+static const struct file_operations fragmentation_file_operations = {
+ .open = fragmentation_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static const struct seq_operations pagetypeinfo_op = {
+ .start = frag_start,
+ .next = frag_next,
+ .stop = frag_stop,
+ .show = pagetypeinfo_show,
+};
+
+static int pagetypeinfo_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &pagetypeinfo_op);
+}
+
+static const struct file_operations pagetypeinfo_file_ops = {
+ .open = pagetypeinfo_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+#ifdef CONFIG_ZONE_DMA
+#define TEXT_FOR_DMA(xx) xx "_dma",
+#else
+#define TEXT_FOR_DMA(xx)
+#endif
+
+#ifdef CONFIG_ZONE_DMA32
+#define TEXT_FOR_DMA32(xx) xx "_dma32",
+#else
+#define TEXT_FOR_DMA32(xx)
+#endif
+
+#ifdef CONFIG_HIGHMEM
+#define TEXT_FOR_HIGHMEM(xx) xx "_high",
+#else
+#define TEXT_FOR_HIGHMEM(xx)
+#endif
+
+#define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \
+ TEXT_FOR_HIGHMEM(xx) xx "_movable",
+
+static const char * const vmstat_text[] = {
+ /* Zoned VM counters */
+ "nr_free_pages",
+ "nr_inactive_anon",
+ "nr_active_anon",
+ "nr_inactive_file",
+ "nr_active_file",
+#ifdef CONFIG_UNEVICTABLE_LRU
+ "nr_unevictable",
+ "nr_mlock",
+#endif
+ "nr_anon_pages",
+ "nr_mapped",
+ "nr_file_pages",
"nr_dirty",
"nr_writeback",
- "nr_unstable",
+ "nr_slab_reclaimable",
+ "nr_slab_unreclaimable",
"nr_page_table_pages",
- "nr_mapped",
- "nr_slab",
+ "nr_unstable",
+ "nr_bounce",
+ "nr_vmscan_write",
+ "nr_writeback_temp",
+
+#ifdef CONFIG_NUMA
+ "numa_hit",
+ "numa_miss",
+ "numa_foreign",
+ "numa_interleave",
+ "numa_local",
+ "numa_other",
+#endif
+#ifdef CONFIG_VM_EVENT_COUNTERS
"pgpgin",
"pgpgout",
"pswpin",
"pswpout",
- "pgalloc_high",
- "pgalloc_normal",
- "pgalloc_dma32",
- "pgalloc_dma",
+ TEXTS_FOR_ZONES("pgalloc")
"pgfree",
"pgactivate",
"pgfault",
"pgmajfault",
- "pgrefill_high",
- "pgrefill_normal",
- "pgrefill_dma32",
- "pgrefill_dma",
-
- "pgsteal_high",
- "pgsteal_normal",
- "pgsteal_dma32",
- "pgsteal_dma",
-
- "pgscan_kswapd_high",
- "pgscan_kswapd_normal",
- "pgscan_kswapd_dma32",
- "pgscan_kswapd_dma",
-
- "pgscan_direct_high",
- "pgscan_direct_normal",
- "pgscan_direct_dma32",
- "pgscan_direct_dma",
+ TEXTS_FOR_ZONES("pgrefill")
+ TEXTS_FOR_ZONES("pgsteal")
+ TEXTS_FOR_ZONES("pgscan_kswapd")
+ TEXTS_FOR_ZONES("pgscan_direct")
"pginodesteal",
"slabs_scanned",
"allocstall",
"pgrotated",
- "nr_bounce",
+#ifdef CONFIG_HUGETLB_PAGE
+ "htlb_buddy_alloc_success",
+ "htlb_buddy_alloc_fail",
+#endif
+#ifdef CONFIG_UNEVICTABLE_LRU
+ "unevictable_pgs_culled",
+ "unevictable_pgs_scanned",
+ "unevictable_pgs_rescued",
+ "unevictable_pgs_mlocked",
+ "unevictable_pgs_munlocked",
+ "unevictable_pgs_cleared",
+ "unevictable_pgs_stranded",
+ "unevictable_pgs_mlockfreed",
+#endif
+#endif
};
+static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
+ struct zone *zone)
+{
+ int i;
+ seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name);
+ seq_printf(m,
+ "\n pages free %lu"
+ "\n min %lu"
+ "\n low %lu"
+ "\n high %lu"
+ "\n scanned %lu (aa: %lu ia: %lu af: %lu if: %lu)"
+ "\n spanned %lu"
+ "\n present %lu",
+ zone_page_state(zone, NR_FREE_PAGES),
+ zone->pages_min,
+ zone->pages_low,
+ zone->pages_high,
+ zone->pages_scanned,
+ zone->lru[LRU_ACTIVE_ANON].nr_scan,
+ zone->lru[LRU_INACTIVE_ANON].nr_scan,
+ zone->lru[LRU_ACTIVE_FILE].nr_scan,
+ zone->lru[LRU_INACTIVE_FILE].nr_scan,
+ zone->spanned_pages,
+ zone->present_pages);
+
+ for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
+ seq_printf(m, "\n %-12s %lu", vmstat_text[i],
+ zone_page_state(zone, i));
+
+ seq_printf(m,
+ "\n protection: (%lu",
+ zone->lowmem_reserve[0]);
+ for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++)
+ seq_printf(m, ", %lu", zone->lowmem_reserve[i]);
+ seq_printf(m,
+ ")"
+ "\n pagesets");
+ for_each_online_cpu(i) {
+ struct per_cpu_pageset *pageset;
+
+ pageset = zone_pcp(zone, i);
+ seq_printf(m,
+ "\n cpu: %i"
+ "\n count: %i"
+ "\n high: %i"
+ "\n batch: %i",
+ i,
+ pageset->pcp.count,
+ pageset->pcp.high,
+ pageset->pcp.batch);
+#ifdef CONFIG_SMP
+ seq_printf(m, "\n vm stats threshold: %d",
+ pageset->stat_threshold);
+#endif
+ }
+ seq_printf(m,
+ "\n all_unreclaimable: %u"
+ "\n prev_priority: %i"
+ "\n start_pfn: %lu"
+ "\n inactive_ratio: %u",
+ zone_is_all_unreclaimable(zone),
+ zone->prev_priority,
+ zone->zone_start_pfn,
+ zone->inactive_ratio);
+ seq_putc(m, '\n');
+}
+
/*
* Output information about zones in @pgdat.
*/
static int zoneinfo_show(struct seq_file *m, void *arg)
{
- pg_data_t *pgdat = arg;
- struct zone *zone;
- struct zone *node_zones = pgdat->node_zones;
- unsigned long flags;
-
- for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; zone++) {
- int i;
-
- if (!populated_zone(zone))
- continue;
-
- spin_lock_irqsave(&zone->lock, flags);
- seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name);
- seq_printf(m,
- "\n pages free %lu"
- "\n min %lu"
- "\n low %lu"
- "\n high %lu"
- "\n active %lu"
- "\n inactive %lu"
- "\n scanned %lu (a: %lu i: %lu)"
- "\n spanned %lu"
- "\n present %lu",
- zone->free_pages,
- zone->pages_min,
- zone->pages_low,
- zone->pages_high,
- zone->nr_active,
- zone->nr_inactive,
- zone->pages_scanned,
- zone->nr_scan_active, zone->nr_scan_inactive,
- zone->spanned_pages,
- zone->present_pages);
- seq_printf(m,
- "\n protection: (%lu",
- zone->lowmem_reserve[0]);
- for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++)
- seq_printf(m, ", %lu", zone->lowmem_reserve[i]);
- seq_printf(m,
- ")"
- "\n pagesets");
- for_each_online_cpu(i) {
- struct per_cpu_pageset *pageset;
- int j;
-
- pageset = zone_pcp(zone, i);
- for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) {
- if (pageset->pcp[j].count)
- break;
- }
- if (j == ARRAY_SIZE(pageset->pcp))
- continue;
- for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) {
- seq_printf(m,
- "\n cpu: %i pcp: %i"
- "\n count: %i"
- "\n high: %i"
- "\n batch: %i",
- i, j,
- pageset->pcp[j].count,
- pageset->pcp[j].high,
- pageset->pcp[j].batch);
- }
-#ifdef CONFIG_NUMA
- seq_printf(m,
- "\n numa_hit: %lu"
- "\n numa_miss: %lu"
- "\n numa_foreign: %lu"
- "\n interleave_hit: %lu"
- "\n local_node: %lu"
- "\n other_node: %lu",
- pageset->numa_hit,
- pageset->numa_miss,
- pageset->numa_foreign,
- pageset->interleave_hit,
- pageset->local_node,
- pageset->other_node);
-#endif
- }
- seq_printf(m,
- "\n all_unreclaimable: %u"
- "\n prev_priority: %i"
- "\n temp_priority: %i"
- "\n start_pfn: %lu",
- zone->all_unreclaimable,
- zone->prev_priority,
- zone->temp_priority,
- zone->zone_start_pfn);
- spin_unlock_irqrestore(&zone->lock, flags);
- seq_putc(m, '\n');
- }
+ pg_data_t *pgdat = (pg_data_t *)arg;
+ walk_zones_in_node(m, pgdat, zoneinfo_show_print);
return 0;
}
-struct seq_operations zoneinfo_op = {
+static const struct seq_operations zoneinfo_op = {
.start = frag_start, /* iterate over all zones. The same as in
* fragmentation. */
.next = frag_next,
.show = zoneinfo_show,
};
+static int zoneinfo_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &zoneinfo_op);
+}
+
+static const struct file_operations proc_zoneinfo_file_operations = {
+ .open = zoneinfo_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
static void *vmstat_start(struct seq_file *m, loff_t *pos)
{
- struct page_state *ps;
+ unsigned long *v;
+#ifdef CONFIG_VM_EVENT_COUNTERS
+ unsigned long *e;
+#endif
+ int i;
if (*pos >= ARRAY_SIZE(vmstat_text))
return NULL;
- ps = kmalloc(sizeof(*ps), GFP_KERNEL);
- m->private = ps;
- if (!ps)
+#ifdef CONFIG_VM_EVENT_COUNTERS
+ v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long)
+ + sizeof(struct vm_event_state), GFP_KERNEL);
+#else
+ v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long),
+ GFP_KERNEL);
+#endif
+ m->private = v;
+ if (!v)
return ERR_PTR(-ENOMEM);
- get_full_page_state(ps);
- ps->pgpgin /= 2; /* sectors -> kbytes */
- ps->pgpgout /= 2;
- return (unsigned long *)ps + *pos;
+ for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
+ v[i] = global_page_state(i);
+#ifdef CONFIG_VM_EVENT_COUNTERS
+ e = v + NR_VM_ZONE_STAT_ITEMS;
+ all_vm_events(e);
+ e[PGPGIN] /= 2; /* sectors -> kbytes */
+ e[PGPGOUT] /= 2;
+#endif
+ return v + *pos;
}
static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos)
m->private = NULL;
}
-struct seq_operations vmstat_op = {
+static const struct seq_operations vmstat_op = {
.start = vmstat_start,
.next = vmstat_next,
.stop = vmstat_stop,
.show = vmstat_show,
};
+static int vmstat_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &vmstat_op);
+}
+
+static const struct file_operations proc_vmstat_file_operations = {
+ .open = vmstat_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
#endif /* CONFIG_PROC_FS */
+#ifdef CONFIG_SMP
+static DEFINE_PER_CPU(struct delayed_work, vmstat_work);
+int sysctl_stat_interval __read_mostly = HZ;
+
+static void vmstat_update(struct work_struct *w)
+{
+ refresh_cpu_vm_stats(smp_processor_id());
+ schedule_delayed_work(&__get_cpu_var(vmstat_work),
+ sysctl_stat_interval);
+}
+
+static void __cpuinit start_cpu_timer(int cpu)
+{
+ struct delayed_work *vmstat_work = &per_cpu(vmstat_work, cpu);
+
+ INIT_DELAYED_WORK_DEFERRABLE(vmstat_work, vmstat_update);
+ schedule_delayed_work_on(cpu, vmstat_work, HZ + cpu);
+}
+
+/*
+ * Use the cpu notifier to insure that the thresholds are recalculated
+ * when necessary.
+ */
+static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb,
+ unsigned long action,
+ void *hcpu)
+{
+ long cpu = (long)hcpu;
+
+ switch (action) {
+ case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
+ start_cpu_timer(cpu);
+ break;
+ case CPU_DOWN_PREPARE:
+ case CPU_DOWN_PREPARE_FROZEN:
+ cancel_rearming_delayed_work(&per_cpu(vmstat_work, cpu));
+ per_cpu(vmstat_work, cpu).work.func = NULL;
+ break;
+ case CPU_DOWN_FAILED:
+ case CPU_DOWN_FAILED_FROZEN:
+ start_cpu_timer(cpu);
+ break;
+ case CPU_DEAD:
+ case CPU_DEAD_FROZEN:
+ refresh_zone_stat_thresholds();
+ break;
+ default:
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata vmstat_notifier =
+ { &vmstat_cpuup_callback, NULL, 0 };
+#endif
+
+static int __init setup_vmstat(void)
+{
+#ifdef CONFIG_SMP
+ int cpu;
+
+ refresh_zone_stat_thresholds();
+ register_cpu_notifier(&vmstat_notifier);
+
+ for_each_online_cpu(cpu)
+ start_cpu_timer(cpu);
+#endif
+#ifdef CONFIG_PROC_FS
+ proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
+ proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
+ proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
+ proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
+#endif
+ return 0;
+}
+module_init(setup_vmstat)
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff