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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/linux/vmstat.h
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_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_slab
; /* In slab */
30 #define GET_PAGE_STATE_LAST nr_slab
33 * The below are zeroed by get_page_state(). Use get_full_page_state()
34 * to add up all these.
36 unsigned long pgpgin
; /* Disk reads */
37 unsigned long pgpgout
; /* Disk writes */
38 unsigned long pswpin
; /* swap reads */
39 unsigned long pswpout
; /* swap writes */
41 unsigned long pgalloc_high
; /* page allocations */
42 unsigned long pgalloc_normal
;
43 unsigned long pgalloc_dma32
;
44 unsigned long pgalloc_dma
;
46 unsigned long pgfree
; /* page freeings */
47 unsigned long pgactivate
; /* pages moved inactive->active */
48 unsigned long pgdeactivate
; /* pages moved active->inactive */
50 unsigned long pgfault
; /* faults (major+minor) */
51 unsigned long pgmajfault
; /* faults (major only) */
53 unsigned long pgrefill_high
; /* inspected in refill_inactive_zone */
54 unsigned long pgrefill_normal
;
55 unsigned long pgrefill_dma32
;
56 unsigned long pgrefill_dma
;
58 unsigned long pgsteal_high
; /* total highmem pages reclaimed */
59 unsigned long pgsteal_normal
;
60 unsigned long pgsteal_dma32
;
61 unsigned long pgsteal_dma
;
63 unsigned long pgscan_kswapd_high
;/* total highmem pages scanned */
64 unsigned long pgscan_kswapd_normal
;
65 unsigned long pgscan_kswapd_dma32
;
66 unsigned long pgscan_kswapd_dma
;
68 unsigned long pgscan_direct_high
;/* total highmem pages scanned */
69 unsigned long pgscan_direct_normal
;
70 unsigned long pgscan_direct_dma32
;
71 unsigned long pgscan_direct_dma
;
73 unsigned long pginodesteal
; /* pages reclaimed via inode freeing */
74 unsigned long slabs_scanned
; /* slab objects scanned */
75 unsigned long kswapd_steal
; /* pages reclaimed by kswapd */
76 unsigned long kswapd_inodesteal
;/* reclaimed via kswapd inode freeing */
77 unsigned long pageoutrun
; /* kswapd's calls to page reclaim */
78 unsigned long allocstall
; /* direct reclaim calls */
80 unsigned long pgrotated
; /* pages rotated to tail of the LRU */
81 unsigned long nr_bounce
; /* pages for bounce buffers */
84 extern void get_page_state(struct page_state
*ret
);
85 extern void get_page_state_node(struct page_state
*ret
, int node
);
86 extern void get_full_page_state(struct page_state
*ret
);
87 extern unsigned long read_page_state_offset(unsigned long offset
);
88 extern void mod_page_state_offset(unsigned long offset
, unsigned long delta
);
89 extern void __mod_page_state_offset(unsigned long offset
, unsigned long delta
);
91 #define read_page_state(member) \
92 read_page_state_offset(offsetof(struct page_state, member))
94 #define mod_page_state(member, delta) \
95 mod_page_state_offset(offsetof(struct page_state, member), (delta))
97 #define __mod_page_state(member, delta) \
98 __mod_page_state_offset(offsetof(struct page_state, member), (delta))
100 #define inc_page_state(member) mod_page_state(member, 1UL)
101 #define dec_page_state(member) mod_page_state(member, 0UL - 1)
102 #define add_page_state(member,delta) mod_page_state(member, (delta))
103 #define sub_page_state(member,delta) mod_page_state(member, 0UL - (delta))
105 #define __inc_page_state(member) __mod_page_state(member, 1UL)
106 #define __dec_page_state(member) __mod_page_state(member, 0UL - 1)
107 #define __add_page_state(member,delta) __mod_page_state(member, (delta))
108 #define __sub_page_state(member,delta) __mod_page_state(member, 0UL - (delta))
110 #define page_state(member) (*__page_state(offsetof(struct page_state, member)))
112 #define state_zone_offset(zone, member) \
115 if (is_highmem(zone)) \
116 offset = offsetof(struct page_state, member##_high); \
117 else if (is_normal(zone)) \
118 offset = offsetof(struct page_state, member##_normal); \
119 else if (is_dma32(zone)) \
120 offset = offsetof(struct page_state, member##_dma32); \
122 offset = offsetof(struct page_state, member##_dma); \
126 #define __mod_page_state_zone(zone, member, delta) \
128 __mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
131 #define mod_page_state_zone(zone, member, delta) \
133 mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
136 DECLARE_PER_CPU(struct page_state
, page_states
);
139 * Zone based page accounting with per cpu differentials.
141 extern atomic_long_t vm_stat
[NR_VM_ZONE_STAT_ITEMS
];
143 static inline void zone_page_state_add(long x
, struct zone
*zone
,
144 enum zone_stat_item item
)
146 atomic_long_add(x
, &zone
->vm_stat
[item
]);
147 atomic_long_add(x
, &vm_stat
[item
]);
150 static inline unsigned long global_page_state(enum zone_stat_item item
)
152 long x
= atomic_long_read(&vm_stat
[item
]);
160 static inline unsigned long zone_page_state(struct zone
*zone
,
161 enum zone_stat_item item
)
163 long x
= atomic_long_read(&zone
->vm_stat
[item
]);
173 * Determine the per node value of a stat item. This function
174 * is called frequently in a NUMA machine, so try to be as
175 * frugal as possible.
177 static inline unsigned long node_page_state(int node
,
178 enum zone_stat_item item
)
180 struct zone
*zones
= NODE_DATA(node
)->node_zones
;
183 #ifndef CONFIG_DMA_IS_NORMAL
184 #if !defined(CONFIG_DMA_IS_DMA32) && BITS_PER_LONG >= 64
185 zone_page_state(&zones
[ZONE_DMA32
], item
) +
187 zone_page_state(&zones
[ZONE_NORMAL
], item
) +
189 #ifdef CONFIG_HIGHMEM
190 zone_page_state(&zones
[ZONE_HIGHMEM
], item
) +
192 zone_page_state(&zones
[ZONE_DMA
], item
);
195 #define node_page_state(node, item) global_page_state(item)
198 #define __add_zone_page_state(__z, __i, __d) \
199 __mod_zone_page_state(__z, __i, __d)
200 #define __sub_zone_page_state(__z, __i, __d) \
201 __mod_zone_page_state(__z, __i,-(__d))
203 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
204 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
206 static inline void zap_zone_vm_stats(struct zone
*zone
)
208 memset(zone
->vm_stat
, 0, sizeof(zone
->vm_stat
));
212 void __mod_zone_page_state(struct zone
*, enum zone_stat_item item
, int);
213 void __inc_zone_page_state(struct page
*, enum zone_stat_item
);
214 void __dec_zone_page_state(struct page
*, enum zone_stat_item
);
216 void mod_zone_page_state(struct zone
*, enum zone_stat_item
, int);
217 void inc_zone_page_state(struct page
*, enum zone_stat_item
);
218 void dec_zone_page_state(struct page
*, enum zone_stat_item
);
220 extern void inc_zone_state(struct zone
*, enum zone_stat_item
);
222 void refresh_cpu_vm_stats(int);
223 void refresh_vm_stats(void);
225 #else /* CONFIG_SMP */
228 * We do not maintain differentials in a single processor configuration.
229 * The functions directly modify the zone and global counters.
231 static inline void __mod_zone_page_state(struct zone
*zone
,
232 enum zone_stat_item item
, int delta
)
234 zone_page_state_add(delta
, zone
, item
);
237 static inline void __inc_zone_page_state(struct page
*page
,
238 enum zone_stat_item item
)
240 atomic_long_inc(&page_zone(page
)->vm_stat
[item
]);
241 atomic_long_inc(&vm_stat
[item
]);
244 static inline void __dec_zone_page_state(struct page
*page
,
245 enum zone_stat_item item
)
247 atomic_long_dec(&page_zone(page
)->vm_stat
[item
]);
248 atomic_long_dec(&vm_stat
[item
]);
252 * We only use atomic operations to update counters. So there is no need to
253 * disable interrupts.
255 #define inc_zone_page_state __inc_zone_page_state
256 #define dec_zone_page_state __dec_zone_page_state
257 #define mod_zone_page_state __mod_zone_page_state
259 static inline void refresh_cpu_vm_stats(int cpu
) { }
260 static inline void refresh_vm_stats(void) { }
263 #endif /* _LINUX_VMSTAT_H */