1 #ifndef _LINUX_VMSTAT_H
2 #define _LINUX_VMSTAT_H
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>
11 * Global page accounting. One instance per CPU. Only unsigned longs are
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
17 * - The __xxx_page_state variants can be used safely when interrupts are
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
25 unsigned long nr_writeback
; /* Pages under writeback */
26 unsigned long nr_unstable
; /* NFS unstable pages */
27 #define GET_PAGE_STATE_LAST nr_unstable
30 * The below are zeroed by get_page_state(). Use get_full_page_state()
31 * to add up all these.
33 unsigned long pgpgin
; /* Disk reads */
34 unsigned long pgpgout
; /* Disk writes */
35 unsigned long pswpin
; /* swap reads */
36 unsigned long pswpout
; /* swap writes */
38 unsigned long pgalloc_high
; /* page allocations */
39 unsigned long pgalloc_normal
;
40 unsigned long pgalloc_dma32
;
41 unsigned long pgalloc_dma
;
43 unsigned long pgfree
; /* page freeings */
44 unsigned long pgactivate
; /* pages moved inactive->active */
45 unsigned long pgdeactivate
; /* pages moved active->inactive */
47 unsigned long pgfault
; /* faults (major+minor) */
48 unsigned long pgmajfault
; /* faults (major only) */
50 unsigned long pgrefill_high
; /* inspected in refill_inactive_zone */
51 unsigned long pgrefill_normal
;
52 unsigned long pgrefill_dma32
;
53 unsigned long pgrefill_dma
;
55 unsigned long pgsteal_high
; /* total highmem pages reclaimed */
56 unsigned long pgsteal_normal
;
57 unsigned long pgsteal_dma32
;
58 unsigned long pgsteal_dma
;
60 unsigned long pgscan_kswapd_high
;/* total highmem pages scanned */
61 unsigned long pgscan_kswapd_normal
;
62 unsigned long pgscan_kswapd_dma32
;
63 unsigned long pgscan_kswapd_dma
;
65 unsigned long pgscan_direct_high
;/* total highmem pages scanned */
66 unsigned long pgscan_direct_normal
;
67 unsigned long pgscan_direct_dma32
;
68 unsigned long pgscan_direct_dma
;
70 unsigned long pginodesteal
; /* pages reclaimed via inode freeing */
71 unsigned long slabs_scanned
; /* slab objects scanned */
72 unsigned long kswapd_steal
; /* pages reclaimed by kswapd */
73 unsigned long kswapd_inodesteal
;/* reclaimed via kswapd inode freeing */
74 unsigned long pageoutrun
; /* kswapd's calls to page reclaim */
75 unsigned long allocstall
; /* direct reclaim calls */
77 unsigned long pgrotated
; /* pages rotated to tail of the LRU */
78 unsigned long nr_bounce
; /* pages for bounce buffers */
81 extern void get_page_state(struct page_state
*ret
);
82 extern void get_page_state_node(struct page_state
*ret
, int node
);
83 extern void get_full_page_state(struct page_state
*ret
);
84 extern unsigned long read_page_state_offset(unsigned long offset
);
85 extern void mod_page_state_offset(unsigned long offset
, unsigned long delta
);
86 extern void __mod_page_state_offset(unsigned long offset
, unsigned long delta
);
88 #define read_page_state(member) \
89 read_page_state_offset(offsetof(struct page_state, member))
91 #define mod_page_state(member, delta) \
92 mod_page_state_offset(offsetof(struct page_state, member), (delta))
94 #define __mod_page_state(member, delta) \
95 __mod_page_state_offset(offsetof(struct page_state, member), (delta))
97 #define inc_page_state(member) mod_page_state(member, 1UL)
98 #define dec_page_state(member) mod_page_state(member, 0UL - 1)
99 #define add_page_state(member,delta) mod_page_state(member, (delta))
100 #define sub_page_state(member,delta) mod_page_state(member, 0UL - (delta))
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))
107 #define page_state(member) (*__page_state(offsetof(struct page_state, member)))
109 #define state_zone_offset(zone, member) \
112 if (is_highmem(zone)) \
113 offset = offsetof(struct page_state, member##_high); \
114 else if (is_normal(zone)) \
115 offset = offsetof(struct page_state, member##_normal); \
116 else if (is_dma32(zone)) \
117 offset = offsetof(struct page_state, member##_dma32); \
119 offset = offsetof(struct page_state, member##_dma); \
123 #define __mod_page_state_zone(zone, member, delta) \
125 __mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
128 #define mod_page_state_zone(zone, member, delta) \
130 mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
133 DECLARE_PER_CPU(struct page_state
, page_states
);
136 * Zone based page accounting with per cpu differentials.
138 extern atomic_long_t vm_stat
[NR_VM_ZONE_STAT_ITEMS
];
140 static inline void zone_page_state_add(long x
, struct zone
*zone
,
141 enum zone_stat_item item
)
143 atomic_long_add(x
, &zone
->vm_stat
[item
]);
144 atomic_long_add(x
, &vm_stat
[item
]);
147 static inline unsigned long global_page_state(enum zone_stat_item item
)
149 long x
= atomic_long_read(&vm_stat
[item
]);
157 static inline unsigned long zone_page_state(struct zone
*zone
,
158 enum zone_stat_item item
)
160 long x
= atomic_long_read(&zone
->vm_stat
[item
]);
170 * Determine the per node value of a stat item. This function
171 * is called frequently in a NUMA machine, so try to be as
172 * frugal as possible.
174 static inline unsigned long node_page_state(int node
,
175 enum zone_stat_item item
)
177 struct zone
*zones
= NODE_DATA(node
)->node_zones
;
180 #ifndef CONFIG_DMA_IS_NORMAL
181 #if !defined(CONFIG_DMA_IS_DMA32) && BITS_PER_LONG >= 64
182 zone_page_state(&zones
[ZONE_DMA32
], item
) +
184 zone_page_state(&zones
[ZONE_NORMAL
], item
) +
186 #ifdef CONFIG_HIGHMEM
187 zone_page_state(&zones
[ZONE_HIGHMEM
], item
) +
189 zone_page_state(&zones
[ZONE_DMA
], item
);
192 #define node_page_state(node, item) global_page_state(item)
195 #define __add_zone_page_state(__z, __i, __d) \
196 __mod_zone_page_state(__z, __i, __d)
197 #define __sub_zone_page_state(__z, __i, __d) \
198 __mod_zone_page_state(__z, __i,-(__d))
200 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
201 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
203 static inline void zap_zone_vm_stats(struct zone
*zone
)
205 memset(zone
->vm_stat
, 0, sizeof(zone
->vm_stat
));
209 void __mod_zone_page_state(struct zone
*, enum zone_stat_item item
, int);
210 void __inc_zone_page_state(struct page
*, enum zone_stat_item
);
211 void __dec_zone_page_state(struct page
*, enum zone_stat_item
);
213 void mod_zone_page_state(struct zone
*, enum zone_stat_item
, int);
214 void inc_zone_page_state(struct page
*, enum zone_stat_item
);
215 void dec_zone_page_state(struct page
*, enum zone_stat_item
);
217 extern void inc_zone_state(struct zone
*, enum zone_stat_item
);
219 void refresh_cpu_vm_stats(int);
220 void refresh_vm_stats(void);
222 #else /* CONFIG_SMP */
225 * We do not maintain differentials in a single processor configuration.
226 * The functions directly modify the zone and global counters.
228 static inline void __mod_zone_page_state(struct zone
*zone
,
229 enum zone_stat_item item
, int delta
)
231 zone_page_state_add(delta
, zone
, item
);
234 static inline void __inc_zone_page_state(struct page
*page
,
235 enum zone_stat_item item
)
237 atomic_long_inc(&page_zone(page
)->vm_stat
[item
]);
238 atomic_long_inc(&vm_stat
[item
]);
241 static inline void __dec_zone_page_state(struct page
*page
,
242 enum zone_stat_item item
)
244 atomic_long_dec(&page_zone(page
)->vm_stat
[item
]);
245 atomic_long_dec(&vm_stat
[item
]);
249 * We only use atomic operations to update counters. So there is no need to
250 * disable interrupts.
252 #define inc_zone_page_state __inc_zone_page_state
253 #define dec_zone_page_state __dec_zone_page_state
254 #define mod_zone_page_state __mod_zone_page_state
256 static inline void refresh_cpu_vm_stats(int cpu
) { }
257 static inline void refresh_vm_stats(void) { }
260 #endif /* _LINUX_VMSTAT_H */
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