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Subject[patch 07/10] Move vmstat to instrumentation/.
Move mm/vmstat.c to instrumentation/.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: Christoph Lameter <christoph@lameter.com>
---
instrumentation/Makefile | 2
instrumentation/vmstat.c | 863 +++++++++++++++++++++++++++++++++++++++++++++++
mm/Makefile | 2
mm/vmstat.c | 863 -----------------------------------------------
4 files changed, 865 insertions(+), 865 deletions(-)

Index: linux-2.6-lttng.stable/instrumentation/Makefile
===================================================================
--- linux-2.6-lttng.stable.orig/instrumentation/Makefile 2007-10-29 09:52:58.000000000 -0400
+++ linux-2.6-lttng.stable/instrumentation/Makefile 2007-10-29 09:53:14.000000000 -0400
@@ -2,7 +2,7 @@
# Makefile for the linux kernel instrumentation
#

-obj-y += profile.o
+obj-y += profile.o vmstat.o

obj-$(CONFIG_KPROBES) += kprobes.o
obj-$(CONFIG_MARKERS) += marker.o
Index: linux-2.6-lttng.stable/mm/Makefile
===================================================================
--- linux-2.6-lttng.stable.orig/mm/Makefile 2007-10-29 09:51:06.000000000 -0400
+++ linux-2.6-lttng.stable/mm/Makefile 2007-10-29 09:53:02.000000000 -0400
@@ -10,7 +10,7 @@ mmu-$(CONFIG_MMU) := fremap.o highmem.o
obj-y := bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
page_alloc.o page-writeback.o pdflush.o \
readahead.o swap.o truncate.o vmscan.o \
- prio_tree.o util.o mmzone.o vmstat.o backing-dev.o \
+ prio_tree.o util.o mmzone.o backing-dev.o \
page_isolation.o $(mmu-y)

obj-$(CONFIG_BOUNCE) += bounce.o
Index: linux-2.6-lttng.stable/instrumentation/vmstat.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6-lttng.stable/instrumentation/vmstat.c 2007-10-29 09:53:02.000000000 -0400
@@ -0,0 +1,863 @@
+/*
+ * linux/mm/vmstat.c
+ *
+ * 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/mm.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/cpu.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, cpumask_t *cpumask)
+{
+ int cpu = 0;
+ int i;
+
+ memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long));
+
+ cpu = first_cpu(*cpumask);
+ while (cpu < NR_CPUS) {
+ struct vm_event_state *this = &per_cpu(vm_event_states, cpu);
+
+ cpu = next_cpu(cpu, *cpumask);
+
+ if (cpu < NR_CPUS)
+ prefetch(&per_cpu(vm_event_states, cpu));
+
+
+ for (i = 0; i < NR_VM_EVENT_ITEMS; i++)
+ ret[i] += this->event[i];
+ }
+}
+
+/*
+ * 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)
+{
+ sum_vm_events(ret, &cpu_online_map);
+}
+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.
+ */
+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);
+
+#ifdef CONFIG_SMP
+
+static int calculate_threshold(struct zone *zone)
+{
+ 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;
+}
+
+/*
+ * Refresh the thresholds for each zone.
+ */
+static void refresh_zone_stat_thresholds(void)
+{
+ struct zone *zone;
+ int cpu;
+ int threshold;
+
+ for_each_zone(zone) {
+
+ if (!zone->present_pages)
+ continue;
+
+ threshold = calculate_threshold(zone);
+
+ for_each_online_cpu(cpu)
+ zone_pcp(zone, cpu)->stat_threshold = threshold;
+ }
+}
+
+/*
+ * For use when we know that interrupts are disabled.
+ */
+void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
+ int delta)
+{
+ struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id());
+ s8 *p = pcp->vm_stat_diff + item;
+ long x;
+
+ x = delta + *p;
+
+ 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);
+
+/*
+ * For an unknown interrupt state
+ */
+void mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
+ int delta)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ __mod_zone_page_state(zone, item, delta);
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(mod_zone_page_state);
+
+/*
+ * 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)
+{
+ struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id());
+ s8 *p = pcp->vm_stat_diff + item;
+
+ (*p)++;
+
+ if (unlikely(*p > pcp->stat_threshold)) {
+ int overstep = pcp->stat_threshold / 2;
+
+ zone_page_state_add(*p + overstep, zone, item);
+ *p = -overstep;
+ }
+}
+
+void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
+{
+ __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)--;
+
+ if (unlikely(*p < - pcp->stat_threshold)) {
+ int overstep = pcp->stat_threshold / 2;
+
+ zone_page_state_add(*p - overstep, zone, item);
+ *p = overstep;
+ }
+}
+
+void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
+{
+ __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;
+
+ local_irq_save(flags);
+ __inc_zone_state(zone, item);
+ local_irq_restore(flags);
+}
+
+void inc_zone_page_state(struct page *page, enum zone_stat_item item)
+{
+ unsigned long flags;
+ struct zone *zone;
+
+ zone = page_zone(page);
+ local_irq_save(flags);
+ __inc_zone_state(zone, item);
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(inc_zone_page_state);
+
+void dec_zone_page_state(struct page *page, enum zone_stat_item item)
+{
+ 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.
+ *
+ * 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;
+ unsigned long flags;
+
+ for_each_zone(zone) {
+ struct per_cpu_pageset *p;
+
+ 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]) {
+ local_irq_save(flags);
+ zone_page_state_add(p->vm_stat_diff[i],
+ zone, i);
+ p->vm_stat_diff[i] = 0;
+#ifdef CONFIG_NUMA
+ /* 3 seconds idle till flush */
+ p->expire = 3;
+#endif
+ local_irq_restore(flags);
+ }
+#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[0].count && !p->pcp[1].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[0].count)
+ drain_zone_pages(zone, p->pcp + 0);
+
+ if (p->pcp[1].count)
+ drain_zone_pages(zone, p->pcp + 1);
+#endif
+ }
+}
+
+#endif
+
+#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 zonelist *zonelist, struct zone *z)
+{
+ if (z->zone_pgdat == zonelist->zones[0]->zone_pgdat) {
+ __inc_zone_state(z, NUMA_HIT);
+ } else {
+ __inc_zone_state(z, NUMA_MISS);
+ __inc_zone_state(zonelist->zones[0], 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/seq_file.h>
+
+static char * const migratetype_names[MIGRATE_TYPES] = {
+ "Unmovable",
+ "Reclaimable",
+ "Movable",
+ "Reserve",
+};
+
+static void *frag_start(struct seq_file *m, loff_t *pos)
+{
+ pg_data_t *pgdat;
+ loff_t node = *pos;
+ for (pgdat = first_online_pgdat();
+ pgdat && node;
+ pgdat = next_online_pgdat(pgdat))
+ --node;
+
+ return pgdat;
+}
+
+static void *frag_next(struct seq_file *m, void *arg, loff_t *pos)
+{
+ pg_data_t *pgdat = (pg_data_t *)arg;
+
+ (*pos)++;
+ return next_online_pgdat(pgdat);
+}
+
+static void frag_stop(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 *))
+{
+ struct zone *zone;
+ struct zone *node_zones = pgdat->node_zones;
+ unsigned long flags;
+
+ for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
+ if (!populated_zone(zone))
+ continue;
+
+ spin_lock_irqsave(&zone->lock, flags);
+ 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;
+}
+
+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);
+ mtype = get_pageblock_migratetype(page);
+
+ 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;
+
+ 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;
+}
+
+const struct seq_operations fragmentation_op = {
+ .start = frag_start,
+ .next = frag_next,
+ .stop = frag_stop,
+ .show = frag_show,
+};
+
+const struct seq_operations pagetypeinfo_op = {
+ .start = frag_start,
+ .next = frag_next,
+ .stop = frag_stop,
+ .show = pagetypeinfo_show,
+};
+
+#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",
+ "nr_active",
+ "nr_anon_pages",
+ "nr_mapped",
+ "nr_file_pages",
+ "nr_dirty",
+ "nr_writeback",
+ "nr_slab_reclaimable",
+ "nr_slab_unreclaimable",
+ "nr_page_table_pages",
+ "nr_unstable",
+ "nr_bounce",
+ "nr_vmscan_write",
+
+#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",
+
+ TEXTS_FOR_ZONES("pgalloc")
+
+ "pgfree",
+ "pgactivate",
+ "pgdeactivate",
+
+ "pgfault",
+ "pgmajfault",
+
+ TEXTS_FOR_ZONES("pgrefill")
+ TEXTS_FOR_ZONES("pgsteal")
+ TEXTS_FOR_ZONES("pgscan_kswapd")
+ TEXTS_FOR_ZONES("pgscan_direct")
+
+ "pginodesteal",
+ "slabs_scanned",
+ "kswapd_steal",
+ "kswapd_inodesteal",
+ "pageoutrun",
+ "allocstall",
+
+ "pgrotated",
+#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 (a: %lu i: %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->nr_scan_active, zone->nr_scan_inactive,
+ 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;
+ int j;
+
+ pageset = zone_pcp(zone, i);
+ 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_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",
+ zone_is_all_unreclaimable(zone),
+ zone->prev_priority,
+ zone->zone_start_pfn);
+ seq_putc(m, '\n');
+}
+
+/*
+ * Output information about zones in @pgdat.
+ */
+static int zoneinfo_show(struct seq_file *m, void *arg)
+{
+ pg_data_t *pgdat = (pg_data_t *)arg;
+ walk_zones_in_node(m, pgdat, zoneinfo_show_print);
+ return 0;
+}
+
+const struct seq_operations zoneinfo_op = {
+ .start = frag_start, /* iterate over all zones. The same as in
+ * fragmentation. */
+ .next = frag_next,
+ .stop = frag_stop,
+ .show = zoneinfo_show,
+};
+
+static void *vmstat_start(struct seq_file *m, loff_t *pos)
+{
+ unsigned long *v;
+#ifdef CONFIG_VM_EVENT_COUNTERS
+ unsigned long *e;
+#endif
+ int i;
+
+ if (*pos >= ARRAY_SIZE(vmstat_text))
+ return NULL;
+
+#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);
+ 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)
+{
+ (*pos)++;
+ if (*pos >= ARRAY_SIZE(vmstat_text))
+ return NULL;
+ return (unsigned long *)m->private + *pos;
+}
+
+static int vmstat_show(struct seq_file *m, void *arg)
+{
+ unsigned long *l = arg;
+ unsigned long off = l - (unsigned long *)m->private;
+
+ seq_printf(m, "%s %lu\n", vmstat_text[off], *l);
+ return 0;
+}
+
+static void vmstat_stop(struct seq_file *m, void *arg)
+{
+ kfree(m->private);
+ m->private = NULL;
+}
+
+const struct seq_operations vmstat_op = {
+ .start = vmstat_start,
+ .next = vmstat_next,
+ .stop = vmstat_stop,
+ .show = vmstat_show,
+};
+
+#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 __devinit 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 };
+
+static int __init setup_vmstat(void)
+{
+ int cpu;
+
+ refresh_zone_stat_thresholds();
+ register_cpu_notifier(&vmstat_notifier);
+
+ for_each_online_cpu(cpu)
+ start_cpu_timer(cpu);
+ return 0;
+}
+module_init(setup_vmstat)
+#endif
Index: linux-2.6-lttng.stable/mm/vmstat.c
===================================================================
--- linux-2.6-lttng.stable.orig/mm/vmstat.c 2007-10-29 09:51:06.000000000 -0400
+++ /dev/null 1970-01-01 00:00:00.000000000 +0000
@@ -1,863 +0,0 @@
-/*
- * linux/mm/vmstat.c
- *
- * 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/mm.h>
-#include <linux/err.h>
-#include <linux/module.h>
-#include <linux/cpu.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, cpumask_t *cpumask)
-{
- int cpu = 0;
- int i;
-
- memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long));
-
- cpu = first_cpu(*cpumask);
- while (cpu < NR_CPUS) {
- struct vm_event_state *this = &per_cpu(vm_event_states, cpu);
-
- cpu = next_cpu(cpu, *cpumask);
-
- if (cpu < NR_CPUS)
- prefetch(&per_cpu(vm_event_states, cpu));
-
-
- for (i = 0; i < NR_VM_EVENT_ITEMS; i++)
- ret[i] += this->event[i];
- }
-}
-
-/*
- * 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)
-{
- sum_vm_events(ret, &cpu_online_map);
-}
-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.
- */
-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);
-
-#ifdef CONFIG_SMP
-
-static int calculate_threshold(struct zone *zone)
-{
- 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;
-}
-
-/*
- * Refresh the thresholds for each zone.
- */
-static void refresh_zone_stat_thresholds(void)
-{
- struct zone *zone;
- int cpu;
- int threshold;
-
- for_each_zone(zone) {
-
- if (!zone->present_pages)
- continue;
-
- threshold = calculate_threshold(zone);
-
- for_each_online_cpu(cpu)
- zone_pcp(zone, cpu)->stat_threshold = threshold;
- }
-}
-
-/*
- * For use when we know that interrupts are disabled.
- */
-void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
- int delta)
-{
- struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id());
- s8 *p = pcp->vm_stat_diff + item;
- long x;
-
- x = delta + *p;
-
- 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);
-
-/*
- * For an unknown interrupt state
- */
-void mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
- int delta)
-{
- unsigned long flags;
-
- local_irq_save(flags);
- __mod_zone_page_state(zone, item, delta);
- local_irq_restore(flags);
-}
-EXPORT_SYMBOL(mod_zone_page_state);
-
-/*
- * 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)
-{
- struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id());
- s8 *p = pcp->vm_stat_diff + item;
-
- (*p)++;
-
- if (unlikely(*p > pcp->stat_threshold)) {
- int overstep = pcp->stat_threshold / 2;
-
- zone_page_state_add(*p + overstep, zone, item);
- *p = -overstep;
- }
-}
-
-void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
-{
- __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)--;
-
- if (unlikely(*p < - pcp->stat_threshold)) {
- int overstep = pcp->stat_threshold / 2;
-
- zone_page_state_add(*p - overstep, zone, item);
- *p = overstep;
- }
-}
-
-void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
-{
- __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;
-
- local_irq_save(flags);
- __inc_zone_state(zone, item);
- local_irq_restore(flags);
-}
-
-void inc_zone_page_state(struct page *page, enum zone_stat_item item)
-{
- unsigned long flags;
- struct zone *zone;
-
- zone = page_zone(page);
- local_irq_save(flags);
- __inc_zone_state(zone, item);
- local_irq_restore(flags);
-}
-EXPORT_SYMBOL(inc_zone_page_state);
-
-void dec_zone_page_state(struct page *page, enum zone_stat_item item)
-{
- 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.
- *
- * 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;
- unsigned long flags;
-
- for_each_zone(zone) {
- struct per_cpu_pageset *p;
-
- 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]) {
- local_irq_save(flags);
- zone_page_state_add(p->vm_stat_diff[i],
- zone, i);
- p->vm_stat_diff[i] = 0;
-#ifdef CONFIG_NUMA
- /* 3 seconds idle till flush */
- p->expire = 3;
-#endif
- local_irq_restore(flags);
- }
-#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[0].count && !p->pcp[1].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[0].count)
- drain_zone_pages(zone, p->pcp + 0);
-
- if (p->pcp[1].count)
- drain_zone_pages(zone, p->pcp + 1);
-#endif
- }
-}
-
-#endif
-
-#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 zonelist *zonelist, struct zone *z)
-{
- if (z->zone_pgdat == zonelist->zones[0]->zone_pgdat) {
- __inc_zone_state(z, NUMA_HIT);
- } else {
- __inc_zone_state(z, NUMA_MISS);
- __inc_zone_state(zonelist->zones[0], 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/seq_file.h>
-
-static char * const migratetype_names[MIGRATE_TYPES] = {
- "Unmovable",
- "Reclaimable",
- "Movable",
- "Reserve",
-};
-
-static void *frag_start(struct seq_file *m, loff_t *pos)
-{
- pg_data_t *pgdat;
- loff_t node = *pos;
- for (pgdat = first_online_pgdat();
- pgdat && node;
- pgdat = next_online_pgdat(pgdat))
- --node;
-
- return pgdat;
-}
-
-static void *frag_next(struct seq_file *m, void *arg, loff_t *pos)
-{
- pg_data_t *pgdat = (pg_data_t *)arg;
-
- (*pos)++;
- return next_online_pgdat(pgdat);
-}
-
-static void frag_stop(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 *))
-{
- struct zone *zone;
- struct zone *node_zones = pgdat->node_zones;
- unsigned long flags;
-
- for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
- if (!populated_zone(zone))
- continue;
-
- spin_lock_irqsave(&zone->lock, flags);
- 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;
-}
-
-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);
- mtype = get_pageblock_migratetype(page);
-
- 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;
-
- 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;
-}
-
-const struct seq_operations fragmentation_op = {
- .start = frag_start,
- .next = frag_next,
- .stop = frag_stop,
- .show = frag_show,
-};
-
-const struct seq_operations pagetypeinfo_op = {
- .start = frag_start,
- .next = frag_next,
- .stop = frag_stop,
- .show = pagetypeinfo_show,
-};
-
-#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",
- "nr_active",
- "nr_anon_pages",
- "nr_mapped",
- "nr_file_pages",
- "nr_dirty",
- "nr_writeback",
- "nr_slab_reclaimable",
- "nr_slab_unreclaimable",
- "nr_page_table_pages",
- "nr_unstable",
- "nr_bounce",
- "nr_vmscan_write",
-
-#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",
-
- TEXTS_FOR_ZONES("pgalloc")
-
- "pgfree",
- "pgactivate",
- "pgdeactivate",
-
- "pgfault",
- "pgmajfault",
-
- TEXTS_FOR_ZONES("pgrefill")
- TEXTS_FOR_ZONES("pgsteal")
- TEXTS_FOR_ZONES("pgscan_kswapd")
- TEXTS_FOR_ZONES("pgscan_direct")
-
- "pginodesteal",
- "slabs_scanned",
- "kswapd_steal",
- "kswapd_inodesteal",
- "pageoutrun",
- "allocstall",
-
- "pgrotated",
-#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 (a: %lu i: %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->nr_scan_active, zone->nr_scan_inactive,
- 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;
- int j;
-
- pageset = zone_pcp(zone, i);
- 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_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",
- zone_is_all_unreclaimable(zone),
- zone->prev_priority,
- zone->zone_start_pfn);
- seq_putc(m, '\n');
-}
-
-/*
- * Output information about zones in @pgdat.
- */
-static int zoneinfo_show(struct seq_file *m, void *arg)
-{
- pg_data_t *pgdat = (pg_data_t *)arg;
- walk_zones_in_node(m, pgdat, zoneinfo_show_print);
- return 0;
-}
-
-const struct seq_operations zoneinfo_op = {
- .start = frag_start, /* iterate over all zones. The same as in
- * fragmentation. */
- .next = frag_next,
- .stop = frag_stop,
- .show = zoneinfo_show,
-};
-
-static void *vmstat_start(struct seq_file *m, loff_t *pos)
-{
- unsigned long *v;
-#ifdef CONFIG_VM_EVENT_COUNTERS
- unsigned long *e;
-#endif
- int i;
-
- if (*pos >= ARRAY_SIZE(vmstat_text))
- return NULL;
-
-#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);
- 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)
-{
- (*pos)++;
- if (*pos >= ARRAY_SIZE(vmstat_text))
- return NULL;
- return (unsigned long *)m->private + *pos;
-}
-
-static int vmstat_show(struct seq_file *m, void *arg)
-{
- unsigned long *l = arg;
- unsigned long off = l - (unsigned long *)m->private;
-
- seq_printf(m, "%s %lu\n", vmstat_text[off], *l);
- return 0;
-}
-
-static void vmstat_stop(struct seq_file *m, void *arg)
-{
- kfree(m->private);
- m->private = NULL;
-}
-
-const struct seq_operations vmstat_op = {
- .start = vmstat_start,
- .next = vmstat_next,
- .stop = vmstat_stop,
- .show = vmstat_show,
-};
-
-#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 __devinit 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 };
-
-static int __init setup_vmstat(void)
-{
- int cpu;
-
- refresh_zone_stat_thresholds();
- register_cpu_notifier(&vmstat_notifier);
-
- for_each_online_cpu(cpu)
- start_cpu_timer(cpu);
- return 0;
-}
-module_init(setup_vmstat)
-#endif
--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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