include/linux/vmstat.h

   1 #ifndef _LINUX_VMSTAT_H
   2 #define _LINUX_VMSTAT_H
   3
   4 #include <linux/types.h>
   5 #include <linux/percpu.h>
   6 #include <linux/config.h>
   7 #include <linux/mmzone.h>
   8 #include <asm/atomic.h>
   9
  10 /*
  11  * Global page accounting.  One instance per CPU.  Only unsigned longs are
  12  * allowed.
  13  *
  14  * - Fields can be modified with xxx_page_state and xxx_page_state_zone at
  15  * any time safely (which protects the instance from modification by
  16  * interrupt.
  17  * - The __xxx_page_state variants can be used safely when interrupts are
  18  * disabled.
  19  * - The __xxx_page_state variants can be used if the field is only
  20  * modified from process context and protected from preemption, or only
  21  * modified from interrupt context.  In this case, the field should be
  22  * commented here.
  23  */
  24 struct page_state {
  25         unsigned long nr_dirty;         /* Dirty writeable pages */
  26         unsigned long nr_writeback;     /* Pages under writeback */
  27         unsigned long nr_unstable;      /* NFS unstable pages */
  28         unsigned long nr_page_table_pages;/* Pages used for pagetables */
  29         unsigned long nr_mapped;        /* mapped into pagetables.
  30                                          * only modified from process context */
  31         unsigned long nr_slab;          /* In slab */
  32 #define GET_PAGE_STATE_LAST nr_slab
  33
  34         /*
  35          * The below are zeroed by get_page_state().  Use get_full_page_state()
  36          * to add up all these.
  37          */
  38         unsigned long pgpgin;           /* Disk reads */
  39         unsigned long pgpgout;          /* Disk writes */
  40         unsigned long pswpin;           /* swap reads */
  41         unsigned long pswpout;          /* swap writes */
  42
  43         unsigned long pgalloc_high;     /* page allocations */
  44         unsigned long pgalloc_normal;
  45         unsigned long pgalloc_dma32;
  46         unsigned long pgalloc_dma;
  47
  48         unsigned long pgfree;           /* page freeings */
  49         unsigned long pgactivate;       /* pages moved inactive->active */
  50         unsigned long pgdeactivate;     /* pages moved active->inactive */
  51
  52         unsigned long pgfault;          /* faults (major+minor) */
  53         unsigned long pgmajfault;       /* faults (major only) */
  54
  55         unsigned long pgrefill_high;    /* inspected in refill_inactive_zone */
  56         unsigned long pgrefill_normal;
  57         unsigned long pgrefill_dma32;
  58         unsigned long pgrefill_dma;
  59
  60         unsigned long pgsteal_high;     /* total highmem pages reclaimed */
  61         unsigned long pgsteal_normal;
  62         unsigned long pgsteal_dma32;
  63         unsigned long pgsteal_dma;
  64
  65         unsigned long pgscan_kswapd_high;/* total highmem pages scanned */
  66         unsigned long pgscan_kswapd_normal;
  67         unsigned long pgscan_kswapd_dma32;
  68         unsigned long pgscan_kswapd_dma;
  69
  70         unsigned long pgscan_direct_high;/* total highmem pages scanned */
  71         unsigned long pgscan_direct_normal;
  72         unsigned long pgscan_direct_dma32;
  73         unsigned long pgscan_direct_dma;
  74
  75         unsigned long pginodesteal;     /* pages reclaimed via inode freeing */
  76         unsigned long slabs_scanned;    /* slab objects scanned */
  77         unsigned long kswapd_steal;     /* pages reclaimed by kswapd */
  78         unsigned long kswapd_inodesteal;/* reclaimed via kswapd inode freeing */
  79         unsigned long pageoutrun;       /* kswapd's calls to page reclaim */
  80         unsigned long allocstall;       /* direct reclaim calls */
  81
  82         unsigned long pgrotated;        /* pages rotated to tail of the LRU */
  83         unsigned long nr_bounce;        /* pages for bounce buffers */
  84 };
  85
  86 extern void get_page_state(struct page_state *ret);
  87 extern void get_page_state_node(struct page_state *ret, int node);
  88 extern void get_full_page_state(struct page_state *ret);
  89 extern unsigned long read_page_state_offset(unsigned long offset);
  90 extern void mod_page_state_offset(unsigned long offset, unsigned long delta);
  91 extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
  92
  93 #define read_page_state(member) \
  94         read_page_state_offset(offsetof(struct page_state, member))
  95
  96 #define mod_page_state(member, delta)   \
  97         mod_page_state_offset(offsetof(struct page_state, member), (delta))
  98
  99 #define __mod_page_state(member, delta) \
 100         __mod_page_state_offset(offsetof(struct page_state, member), (delta))
 101
 102 #define inc_page_state(member)          mod_page_state(member, 1UL)
 103 #define dec_page_state(member)          mod_page_state(member, 0UL - 1)
 104 #define add_page_state(member,delta)    mod_page_state(member, (delta))
 105 #define sub_page_state(member,delta)    mod_page_state(member, 0UL - (delta))
 106
 107 #define __inc_page_state(member)        __mod_page_state(member, 1UL)
 108 #define __dec_page_state(member)        __mod_page_state(member, 0UL - 1)
 109 #define __add_page_state(member,delta)  __mod_page_state(member, (delta))
 110 #define __sub_page_state(member,delta)  __mod_page_state(member, 0UL - (delta))
 111
 112 #define page_state(member) (*__page_state(offsetof(struct page_state, member)))
 113
 114 #define state_zone_offset(zone, member)                                 \
 115 ({                                                                      \
 116         unsigned offset;                                                \
 117         if (is_highmem(zone))                                           \
 118                 offset = offsetof(struct page_state, member##_high);    \
 119         else if (is_normal(zone))                                       \
 120                 offset = offsetof(struct page_state, member##_normal);  \
 121         else if (is_dma32(zone))                                        \
 122                 offset = offsetof(struct page_state, member##_dma32);   \
 123         else                                                            \
 124                 offset = offsetof(struct page_state, member##_dma);     \
 125         offset;                                                         \
 126 })
 127
 128 #define __mod_page_state_zone(zone, member, delta)                      \
 129  do {                                                                   \
 130         __mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
 131  } while (0)
 132
 133 #define mod_page_state_zone(zone, member, delta)                        \
 134  do {                                                                   \
 135         mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
 136  } while (0)
 137
 138 DECLARE_PER_CPU(struct page_state, page_states);
 139
 140 /*
 141  * Zone based page accounting with per cpu differentials.
 142  */
 143 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
 144
 145 static inline void zone_page_state_add(long x, struct zone *zone,
 146                                  enum zone_stat_item item)
 147 {
 148         atomic_long_add(x, &zone->vm_stat[item]);
 149         atomic_long_add(x, &vm_stat[item]);
 150 }
 151
 152 static inline unsigned long global_page_state(enum zone_stat_item item)
 153 {
 154         long x = atomic_long_read(&vm_stat[item]);
 155 #ifdef CONFIG_SMP
 156         if (x < 0)
 157                 x = 0;
 158 #endif
 159         return x;
 160 }
 161
 162 static inline unsigned long zone_page_state(struct zone *zone,
 163                                         enum zone_stat_item item)
 164 {
 165         long x = atomic_long_read(&zone->vm_stat[item]);
 166 #ifdef CONFIG_SMP
 167         if (x < 0)
 168                 x = 0;
 169 #endif
 170         return x;
 171 }
 172
 173 #ifdef CONFIG_NUMA
 174 /*
 175  * Determine the per node value of a stat item. This function
 176  * is called frequently in a NUMA machine, so try to be as
 177  * frugal as possible.
 178  */
 179 static inline unsigned long node_page_state(int node,
 180                                  enum zone_stat_item item)
 181 {
 182         struct zone *zones = NODE_DATA(node)->node_zones;
 183
 184         return
 185 #ifndef CONFIG_DMA_IS_NORMAL
 186 #if !defined(CONFIG_DMA_IS_DMA32) && BITS_PER_LONG >= 64
 187                 zone_page_state(&zones[ZONE_DMA32], item) +
 188 #endif
 189                 zone_page_state(&zones[ZONE_NORMAL], item) +
 190 #endif
 191 #ifdef CONFIG_HIGHMEM
 192                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 193 #endif
 194                 zone_page_state(&zones[ZONE_DMA], item);
 195 }
 196 #else
 197 #define node_page_state(node, item) global_page_state(item)
 198 #endif
 199
 200 #define __add_zone_page_state(__z, __i, __d)    \
 201                 __mod_zone_page_state(__z, __i, __d)
 202 #define __sub_zone_page_state(__z, __i, __d)    \
 203                 __mod_zone_page_state(__z, __i,-(__d))
 204
 205 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 206 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 207
 208 static inline void zap_zone_vm_stats(struct zone *zone)
 209 {
 210         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 211 }
 212
 213 #ifdef CONFIG_SMP
 214 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
 215 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 216 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 217
 218 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
 219 void inc_zone_page_state(struct page *, enum zone_stat_item);
 220 void dec_zone_page_state(struct page *, enum zone_stat_item);
 221
 222 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 223
 224 void refresh_cpu_vm_stats(int);
 225 void refresh_vm_stats(void);
 226
 227 #else /* CONFIG_SMP */
 228
 229 /*
 230  * We do not maintain differentials in a single processor configuration.
 231  * The functions directly modify the zone and global counters.
 232  */
 233 static inline void __mod_zone_page_state(struct zone *zone,
 234                         enum zone_stat_item item, int delta)
 235 {
 236         zone_page_state_add(delta, zone, item);
 237 }
 238
 239 static inline void __inc_zone_page_state(struct page *page,
 240                         enum zone_stat_item item)
 241 {
 242         atomic_long_inc(&page_zone(page)->vm_stat[item]);
 243         atomic_long_inc(&vm_stat[item]);
 244 }
 245
 246 static inline void __dec_zone_page_state(struct page *page,
 247                         enum zone_stat_item item)
 248 {
 249         atomic_long_dec(&page_zone(page)->vm_stat[item]);
 250         atomic_long_dec(&vm_stat[item]);
 251 }
 252
 253 /*
 254  * We only use atomic operations to update counters. So there is no need to
 255  * disable interrupts.
 256  */
 257 #define inc_zone_page_state __inc_zone_page_state
 258 #define dec_zone_page_state __dec_zone_page_state
 259 #define mod_zone_page_state __mod_zone_page_state
 260
 261 static inline void refresh_cpu_vm_stats(int cpu) { }
 262 static inline void refresh_vm_stats(void) { }
 263 #endif
 264
 265 #endif /* _LINUX_VMSTAT_H */