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
   7 /*
   8  * Global page accounting.  One instance per CPU.  Only unsigned longs are
   9  * allowed.
  10  *
  11  * - Fields can be modified with xxx_page_state and xxx_page_state_zone at
  12  * any time safely (which protects the instance from modification by
  13  * interrupt.
  14  * - The __xxx_page_state variants can be used safely when interrupts are
  15  * disabled.
  16  * - The __xxx_page_state variants can be used if the field is only
  17  * modified from process context and protected from preemption, or only
  18  * modified from interrupt context.  In this case, the field should be
  19  * commented here.
  20  */
  21 struct page_state {
  22         unsigned long nr_dirty;         /* Dirty writeable pages */
  23         unsigned long nr_writeback;     /* Pages under writeback */
  24         unsigned long nr_unstable;      /* NFS unstable pages */
  25         unsigned long nr_page_table_pages;/* Pages used for pagetables */
  26         unsigned long nr_mapped;        /* mapped into pagetables.
  27                                          * only modified from process context */
  28         unsigned long nr_slab;          /* In slab */
  29 #define GET_PAGE_STATE_LAST nr_slab
  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 #endif /* _LINUX_VMSTAT_H */
 138