err.no Git - linux-2.6/blob - 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 #define GET_PAGE_STATE_LAST nr_page_table_pages
  30
  31         /*
  32          * The below are zeroed by get_page_state().  Use get_full_page_state()
  33          * to add up all these.
  34          */
  35         unsigned long pgpgin;           /* Disk reads */
  36         unsigned long pgpgout;          /* Disk writes */
  37         unsigned long pswpin;           /* swap reads */
  38         unsigned long pswpout;          /* swap writes */
  39
  40         unsigned long pgalloc_high;     /* page allocations */
  41         unsigned long pgalloc_normal;
  42         unsigned long pgalloc_dma32;
  43         unsigned long pgalloc_dma;
  44
  45         unsigned long pgfree;           /* page freeings */
  46         unsigned long pgactivate;       /* pages moved inactive->active */
  47         unsigned long pgdeactivate;     /* pages moved active->inactive */
  48
  49         unsigned long pgfault;          /* faults (major+minor) */
  50         unsigned long pgmajfault;       /* faults (major only) */
  51
  52         unsigned long pgrefill_high;    /* inspected in refill_inactive_zone */
  53         unsigned long pgrefill_normal;
  54         unsigned long pgrefill_dma32;
  55         unsigned long pgrefill_dma;
  56
  57         unsigned long pgsteal_high;     /* total highmem pages reclaimed */
  58         unsigned long pgsteal_normal;
  59         unsigned long pgsteal_dma32;
  60         unsigned long pgsteal_dma;
  61
  62         unsigned long pgscan_kswapd_high;/* total highmem pages scanned */
  63         unsigned long pgscan_kswapd_normal;
  64         unsigned long pgscan_kswapd_dma32;
  65         unsigned long pgscan_kswapd_dma;
  66
  67         unsigned long pgscan_direct_high;/* total highmem pages scanned */
  68         unsigned long pgscan_direct_normal;
  69         unsigned long pgscan_direct_dma32;
  70         unsigned long pgscan_direct_dma;
  71
  72         unsigned long pginodesteal;     /* pages reclaimed via inode freeing */
  73         unsigned long slabs_scanned;    /* slab objects scanned */
  74         unsigned long kswapd_steal;     /* pages reclaimed by kswapd */
  75         unsigned long kswapd_inodesteal;/* reclaimed via kswapd inode freeing */
  76         unsigned long pageoutrun;       /* kswapd's calls to page reclaim */
  77         unsigned long allocstall;       /* direct reclaim calls */
  78
  79         unsigned long pgrotated;        /* pages rotated to tail of the LRU */
  80         unsigned long nr_bounce;        /* pages for bounce buffers */
  81 };
  82
  83 extern void get_page_state(struct page_state *ret);
  84 extern void get_page_state_node(struct page_state *ret, int node);
  85 extern void get_full_page_state(struct page_state *ret);
  86 extern unsigned long read_page_state_offset(unsigned long offset);
  87 extern void mod_page_state_offset(unsigned long offset, unsigned long delta);
  88 extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
  89
  90 #define read_page_state(member) \
  91         read_page_state_offset(offsetof(struct page_state, member))
  92
  93 #define mod_page_state(member, delta)   \
  94         mod_page_state_offset(offsetof(struct page_state, member), (delta))
  95
  96 #define __mod_page_state(member, delta) \
  97         __mod_page_state_offset(offsetof(struct page_state, member), (delta))
  98
  99 #define inc_page_state(member)          mod_page_state(member, 1UL)
 100 #define dec_page_state(member)          mod_page_state(member, 0UL - 1)
 101 #define add_page_state(member,delta)    mod_page_state(member, (delta))
 102 #define sub_page_state(member,delta)    mod_page_state(member, 0UL - (delta))
 103
 104 #define __inc_page_state(member)        __mod_page_state(member, 1UL)
 105 #define __dec_page_state(member)        __mod_page_state(member, 0UL - 1)
 106 #define __add_page_state(member,delta)  __mod_page_state(member, (delta))
 107 #define __sub_page_state(member,delta)  __mod_page_state(member, 0UL - (delta))
 108
 109 #define page_state(member) (*__page_state(offsetof(struct page_state, member)))
 110
 111 #define state_zone_offset(zone, member)                                 \
 112 ({                                                                      \
 113         unsigned offset;                                                \
 114         if (is_highmem(zone))                                           \
 115                 offset = offsetof(struct page_state, member##_high);    \
 116         else if (is_normal(zone))                                       \
 117                 offset = offsetof(struct page_state, member##_normal);  \
 118         else if (is_dma32(zone))                                        \
 119                 offset = offsetof(struct page_state, member##_dma32);   \
 120         else                                                            \
 121                 offset = offsetof(struct page_state, member##_dma);     \
 122         offset;                                                         \
 123 })
 124
 125 #define __mod_page_state_zone(zone, member, delta)                      \
 126  do {                                                                   \
 127         __mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
 128  } while (0)
 129
 130 #define mod_page_state_zone(zone, member, delta)                        \
 131  do {                                                                   \
 132         mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
 133  } while (0)
 134
 135 DECLARE_PER_CPU(struct page_state, page_states);
 136
 137 /*
 138  * Zone based page accounting with per cpu differentials.
 139  */
 140 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
 141
 142 static inline void zone_page_state_add(long x, struct zone *zone,
 143                                  enum zone_stat_item item)
 144 {
 145         atomic_long_add(x, &zone->vm_stat[item]);
 146         atomic_long_add(x, &vm_stat[item]);
 147 }
 148
 149 static inline unsigned long global_page_state(enum zone_stat_item item)
 150 {
 151         long x = atomic_long_read(&vm_stat[item]);
 152 #ifdef CONFIG_SMP
 153         if (x < 0)
 154                 x = 0;
 155 #endif
 156         return x;
 157 }
 158
 159 static inline unsigned long zone_page_state(struct zone *zone,
 160                                         enum zone_stat_item item)
 161 {
 162         long x = atomic_long_read(&zone->vm_stat[item]);
 163 #ifdef CONFIG_SMP
 164         if (x < 0)
 165                 x = 0;
 166 #endif
 167         return x;
 168 }
 169
 170 #ifdef CONFIG_NUMA
 171 /*
 172  * Determine the per node value of a stat item. This function
 173  * is called frequently in a NUMA machine, so try to be as
 174  * frugal as possible.
 175  */
 176 static inline unsigned long node_page_state(int node,
 177                                  enum zone_stat_item item)
 178 {
 179         struct zone *zones = NODE_DATA(node)->node_zones;
 180
 181         return
 182 #ifndef CONFIG_DMA_IS_NORMAL
 183 #if !defined(CONFIG_DMA_IS_DMA32) && BITS_PER_LONG >= 64
 184                 zone_page_state(&zones[ZONE_DMA32], item) +
 185 #endif
 186                 zone_page_state(&zones[ZONE_NORMAL], item) +
 187 #endif
 188 #ifdef CONFIG_HIGHMEM
 189                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 190 #endif
 191                 zone_page_state(&zones[ZONE_DMA], item);
 192 }
 193 #else
 194 #define node_page_state(node, item) global_page_state(item)
 195 #endif
 196
 197 #define __add_zone_page_state(__z, __i, __d)    \
 198                 __mod_zone_page_state(__z, __i, __d)
 199 #define __sub_zone_page_state(__z, __i, __d)    \
 200                 __mod_zone_page_state(__z, __i,-(__d))
 201
 202 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 203 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 204
 205 static inline void zap_zone_vm_stats(struct zone *zone)
 206 {
 207         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 208 }
 209
 210 #ifdef CONFIG_SMP
 211 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
 212 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 213 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 214
 215 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
 216 void inc_zone_page_state(struct page *, enum zone_stat_item);
 217 void dec_zone_page_state(struct page *, enum zone_stat_item);
 218
 219 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 220
 221 void refresh_cpu_vm_stats(int);
 222 void refresh_vm_stats(void);
 223
 224 #else /* CONFIG_SMP */
 225
 226 /*
 227  * We do not maintain differentials in a single processor configuration.
 228  * The functions directly modify the zone and global counters.
 229  */
 230 static inline void __mod_zone_page_state(struct zone *zone,
 231                         enum zone_stat_item item, int delta)
 232 {
 233         zone_page_state_add(delta, zone, item);
 234 }
 235
 236 static inline void __inc_zone_page_state(struct page *page,
 237                         enum zone_stat_item item)
 238 {
 239         atomic_long_inc(&page_zone(page)->vm_stat[item]);
 240         atomic_long_inc(&vm_stat[item]);
 241 }
 242
 243 static inline void __dec_zone_page_state(struct page *page,
 244                         enum zone_stat_item item)
 245 {
 246         atomic_long_dec(&page_zone(page)->vm_stat[item]);
 247         atomic_long_dec(&vm_stat[item]);
 248 }
 249
 250 /*
 251  * We only use atomic operations to update counters. So there is no need to
 252  * disable interrupts.
 253  */
 254 #define inc_zone_page_state __inc_zone_page_state
 255 #define dec_zone_page_state __dec_zone_page_state
 256 #define mod_zone_page_state __mod_zone_page_state
 257
 258 static inline void refresh_cpu_vm_stats(int cpu) { }
 259 static inline void refresh_vm_stats(void) { }
 260 #endif
 261
 262 #endif /* _LINUX_VMSTAT_H */