1 files changed, 220 insertions, 0 deletions

diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
new file mode 100644
index 00000000000..2d9b1b60798
--- /dev/null
+++ b/include/linux/vmstat.h
@@ -0,0 +1,220 @@
+#ifndef _LINUX_VMSTAT_H
+#define _LINUX_VMSTAT_H
+
+#include <linux/types.h>
+#include <linux/percpu.h>
+#include <linux/config.h>
+#include <linux/mmzone.h>
+#include <asm/atomic.h>
+
+#ifdef CONFIG_VM_EVENT_COUNTERS
+/*
+ * Light weight per cpu counter implementation.
+ *
+ * Counters should only be incremented and no critical kernel component
+ * should rely on the counter values.
+ *
+ * Counters are handled completely inline. On many platforms the code
+ * generated will simply be the increment of a global address.
+ */
+
+#define FOR_ALL_ZONES(x) x##_DMA, x##_DMA32, x##_NORMAL, x##_HIGH
+
+enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
+                FOR_ALL_ZONES(PGALLOC),
+                PGFREE, PGACTIVATE, PGDEACTIVATE,
+                PGFAULT, PGMAJFAULT,
+                FOR_ALL_ZONES(PGREFILL),
+                FOR_ALL_ZONES(PGSTEAL),
+                FOR_ALL_ZONES(PGSCAN_KSWAPD),
+                FOR_ALL_ZONES(PGSCAN_DIRECT),
+                PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
+                PAGEOUTRUN, ALLOCSTALL, PGROTATED,
+                NR_VM_EVENT_ITEMS
+};
+
+struct vm_event_state {
+        unsigned long event[NR_VM_EVENT_ITEMS];
+};
+
+DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
+
+static inline void __count_vm_event(enum vm_event_item item)
+{
+        __get_cpu_var(vm_event_states).event[item]++;
+}
+
+static inline void count_vm_event(enum vm_event_item item)
+{
+        get_cpu_var(vm_event_states).event[item]++;
+        put_cpu();
+}
+
+static inline void __count_vm_events(enum vm_event_item item, long delta)
+{
+        __get_cpu_var(vm_event_states).event[item] += delta;
+}
+
+static inline void count_vm_events(enum vm_event_item item, long delta)
+{
+        get_cpu_var(vm_event_states).event[item] += delta;
+        put_cpu();
+}
+
+extern void all_vm_events(unsigned long *);
+extern void vm_events_fold_cpu(int cpu);
+
+#else
+
+/* Disable counters */
+#define get_cpu_vm_events(e)    0L
+#define count_vm_event(e)       do { } while (0)
+#define count_vm_events(e,d)    do { } while (0)
+#define __count_vm_event(e)     do { } while (0)
+#define __count_vm_events(e,d)  do { } while (0)
+#define vm_events_fold_cpu(x)   do { } while (0)
+
+#endif /* CONFIG_VM_EVENT_COUNTERS */
+
+#define __count_zone_vm_events(item, zone, delta) \
+                        __count_vm_events(item##_DMA + zone_idx(zone), delta)
+
+/*
+ * Zone based page accounting with per cpu differentials.
+ */
+extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
+
+static inline void zone_page_state_add(long x, struct zone *zone,
+                                 enum zone_stat_item item)
+{
+        atomic_long_add(x, &zone->vm_stat[item]);
+        atomic_long_add(x, &vm_stat[item]);
+}
+
+static inline unsigned long global_page_state(enum zone_stat_item item)
+{
+        long x = atomic_long_read(&vm_stat[item]);
+#ifdef CONFIG_SMP
+        if (x < 0)
+                x = 0;
+#endif
+        return x;
+}
+
+static inline unsigned long zone_page_state(struct zone *zone,
+                                        enum zone_stat_item item)
+{
+        long x = atomic_long_read(&zone->vm_stat[item]);
+#ifdef CONFIG_SMP
+        if (x < 0)
+                x = 0;
+#endif
+        return x;
+}
+
+#ifdef CONFIG_NUMA
+/*
+ * Determine the per node value of a stat item. This function
+ * is called frequently in a NUMA machine, so try to be as
+ * frugal as possible.
+ */
+static inline unsigned long node_page_state(int node,
+                                 enum zone_stat_item item)
+{
+        struct zone *zones = NODE_DATA(node)->node_zones;
+
+        return
+#ifndef CONFIG_DMA_IS_NORMAL
+#if !defined(CONFIG_DMA_IS_DMA32) && BITS_PER_LONG >= 64
+                zone_page_state(&zones[ZONE_DMA32], item) +
+#endif
+                zone_page_state(&zones[ZONE_NORMAL], item) +
+#endif
+#ifdef CONFIG_HIGHMEM
+                zone_page_state(&zones[ZONE_HIGHMEM], item) +
+#endif
+                zone_page_state(&zones[ZONE_DMA], item);
+}
+
+extern void zone_statistics(struct zonelist *, struct zone *);
+
+#else
+
+#define node_page_state(node, item) global_page_state(item)
+#define zone_statistics(_zl,_z) do { } while (0)
+
+#endif /* CONFIG_NUMA */
+
+#define __add_zone_page_state(__z, __i, __d)    \
+                __mod_zone_page_state(__z, __i, __d)
+#define __sub_zone_page_state(__z, __i, __d)    \
+                __mod_zone_page_state(__z, __i,-(__d))
+
+#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
+#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
+
+static inline void zap_zone_vm_stats(struct zone *zone)
+{
+        memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
+}
+
+extern void inc_zone_state(struct zone *, enum zone_stat_item);
+
+#ifdef CONFIG_SMP
+void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
+void __inc_zone_page_state(struct page *, enum zone_stat_item);
+void __dec_zone_page_state(struct page *, enum zone_stat_item);
+
+void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
+void inc_zone_page_state(struct page *, enum zone_stat_item);
+void dec_zone_page_state(struct page *, enum zone_stat_item);
+
+extern void inc_zone_state(struct zone *, enum zone_stat_item);
+
+void refresh_cpu_vm_stats(int);
+void refresh_vm_stats(void);
+
+#else /* CONFIG_SMP */
+
+/*
+ * We do not maintain differentials in a single processor configuration.
+ * The functions directly modify the zone and global counters.
+ */
+static inline void __mod_zone_page_state(struct zone *zone,
+                        enum zone_stat_item item, int delta)
+{
+        zone_page_state_add(delta, zone, item);
+}
+
+static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
+{
+        atomic_long_inc(&zone->vm_stat[item]);
+        atomic_long_inc(&vm_stat[item]);
+}
+
+static inline void __inc_zone_page_state(struct page *page,
+                        enum zone_stat_item item)
+{
+        __inc_zone_state(page_zone(page), item);
+}
+
+static inline void __dec_zone_page_state(struct page *page,
+                        enum zone_stat_item item)
+{
+        atomic_long_dec(&page_zone(page)->vm_stat[item]);
+        atomic_long_dec(&vm_stat[item]);
+}
+
+/*
+ * We only use atomic operations to update counters. So there is no need to
+ * disable interrupts.
+ */
+#define inc_zone_page_state __inc_zone_page_state
+#define dec_zone_page_state __dec_zone_page_state
+#define mod_zone_page_state __mod_zone_page_state
+
+static inline void refresh_cpu_vm_stats(int cpu) { }
+static inline void refresh_vm_stats(void) { }
+#endif
+
+#endif /* _LINUX_VMSTAT_H */