1 #ifndef _LINUX_VMSTAT_H
2 #define _LINUX_VMSTAT_H
3
4 #include <linux/types.h>
5 #include <linux/percpu.h>
6 #include <linux/mm.h>
7 #include <linux/mmzone.h>
8 #include <asm/atomic.h>
9
10 #ifdef CONFIG_ZONE_DMA
11 #define DMA_ZONE(xx) xx##_DMA,
12 #else
13 #define DMA_ZONE(xx)
14 #endif
15
16 #ifdef CONFIG_ZONE_DMA32
17 #define DMA32_ZONE(xx) xx##_DMA32,
18 #else
19 #define DMA32_ZONE(xx)
20 #endif
21
22 #ifdef CONFIG_HIGHMEM
23 #define HIGHMEM_ZONE(xx) , xx##_HIGH
24 #else
25 #define HIGHMEM_ZONE(xx)
26 #endif
27
28 #define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx) , xx##_MOVABLE
29
30 enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
31 FOR_ALL_ZONES(PGALLOC),
32 PGFREE, PGACTIVATE, PGDEACTIVATE,
33 PGFAULT, PGMAJFAULT,
34 FOR_ALL_ZONES(PGREFILL),
35 FOR_ALL_ZONES(PGSTEAL),
36 FOR_ALL_ZONES(PGSCAN_KSWAPD),
37 FOR_ALL_ZONES(PGSCAN_DIRECT),
38 PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
39 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
40 NR_VM_EVENT_ITEMS
41 };
42
43 #ifdef CONFIG_VM_EVENT_COUNTERS
44 /*
45 * Light weight per cpu counter implementation.
46 *
47 * Counters should only be incremented and no critical kernel component
48 * should rely on the counter values.
49 *
50 * Counters are handled completely inline. On many platforms the code
51 * generated will simply be the increment of a global address.
52 */
53
54 struct vm_event_state {
55 unsigned long event[NR_VM_EVENT_ITEMS];
56 };
57
58 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
59
60 static inline void __count_vm_event(enum vm_event_item item)
61 {
62 #ifdef CONFIG_PREEMPT_RT
63 get_cpu_var(vm_event_states).event[item]++;
64 put_cpu();
65 #else
66 __get_cpu_var(vm_event_states).event[item]++;
67 #endif
68 }
69
70 static inline void count_vm_event(enum vm_event_item item)
71 {
72 get_cpu_var(vm_event_states).event[item]++;
73 put_cpu();
74 }
75
76 static inline void __count_vm_events(enum vm_event_item item, long delta)
77 {
78 #ifdef CONFIG_PREEMPT_RT
79 get_cpu_var(vm_event_states).event[item] += delta;
80 put_cpu();
81 #else
82 __get_cpu_var(vm_event_states).event[item] += delta;
83 #endif
84 }
85
86 static inline void count_vm_events(enum vm_event_item item, long delta)
87 {
88 get_cpu_var(vm_event_states).event[item] += delta;
89 put_cpu();
90 }
91
92 extern void all_vm_events(unsigned long *);
93 #ifdef CONFIG_HOTPLUG
94 extern void vm_events_fold_cpu(int cpu);
95 #else
96 static inline void vm_events_fold_cpu(int cpu)
97 {
98 }
99 #endif
100
101 #else
102
103 /* Disable counters */
104 static inline void count_vm_event(enum vm_event_item item)
105 {
106 }
107 static inline void count_vm_events(enum vm_event_item item, long delta)
108 {
109 }
110 static inline void __count_vm_event(enum vm_event_item item)
111 {
112 }
113 static inline void __count_vm_events(enum vm_event_item item, long delta)
114 {
115 }
116 static inline void all_vm_events(unsigned long *ret)
117 {
118 }
119 static inline void vm_events_fold_cpu(int cpu)
120 {
121 }
122
123 #endif /* CONFIG_VM_EVENT_COUNTERS */
124
125 #define __count_zone_vm_events(item, zone, delta) \
126 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
127 zone_idx(zone), delta)
128
129 /*
130 * Zone based page accounting with per cpu differentials.
131 */
132 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
133
134 static inline void zone_page_state_add(long x, struct zone *zone,
135 enum zone_stat_item item)
136 {
137 atomic_long_add(x, &zone->vm_stat[item]);
138 atomic_long_add(x, &vm_stat[item]);
139 }
140
141 static inline unsigned long global_page_state(enum zone_stat_item item)
142 {
143 long x = atomic_long_read(&vm_stat[item]);
144 #ifdef CONFIG_SMP
145 if (x < 0)
146 x = 0;
147 #endif
148 return x;
149 }
150
151 static inline unsigned long zone_page_state(struct zone *zone,
152 enum zone_stat_item item)
153 {
154 long x = atomic_long_read(&zone->vm_stat[item]);
155 #ifdef CONFIG_SMP
156 if (x < 0)
157 x = 0;
158 #endif
159 return x;
160 }
161
162 #ifdef CONFIG_NUMA
163 /*
164 * Determine the per node value of a stat item. This function
165 * is called frequently in a NUMA machine, so try to be as
166 * frugal as possible.
167 */
168 static inline unsigned long node_page_state(int node,
169 enum zone_stat_item item)
170 {
171 struct zone *zones = NODE_DATA(node)->node_zones;
172
173 return
174 #ifdef CONFIG_ZONE_DMA
175 zone_page_state(&zones[ZONE_DMA], item) +
176 #endif
177 #ifdef CONFIG_ZONE_DMA32
178 zone_page_state(&zones[ZONE_DMA32], item) +
179 #endif
180 #ifdef CONFIG_HIGHMEM
181 zone_page_state(&zones[ZONE_HIGHMEM], item) +
182 #endif
183 zone_page_state(&zones[ZONE_NORMAL], item) +
184 zone_page_state(&zones[ZONE_MOVABLE], item);
185 }
186
187 extern void zone_statistics(struct zonelist *, struct zone *);
188
189 #else
190
191 #define node_page_state(node, item) global_page_state(item)
192 #define zone_statistics(_zl,_z) do { } while (0)
193
194 #endif /* CONFIG_NUMA */
195
196 #define __add_zone_page_state(__z, __i, __d) \
197 __mod_zone_page_state(__z, __i, __d)
198 #define __sub_zone_page_state(__z, __i, __d) \
199 __mod_zone_page_state(__z, __i,-(__d))
200
201 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
202 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
203
204 static inline void zap_zone_vm_stats(struct zone *zone)
205 {
206 memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
207 }
208
209 extern void inc_zone_state(struct zone *, enum zone_stat_item);
210
211 #ifdef CONFIG_SMP
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);
215
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);
219
220 extern void inc_zone_state(struct zone *, enum zone_stat_item);
221 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
222 extern void dec_zone_state(struct zone *, enum zone_stat_item);
223 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
224
225 void refresh_cpu_vm_stats(int);
226 #else /* CONFIG_SMP */
227
228 /*
229 * We do not maintain differentials in a single processor configuration.
230 * The functions directly modify the zone and global counters.
231 */
232 static inline void __mod_zone_page_state(struct zone *zone,
233 enum zone_stat_item item, int delta)
234 {
235 zone_page_state_add(delta, zone, item);
236 }
237
238 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
239 {
240 atomic_long_inc(&zone->vm_stat[item]);
241 atomic_long_inc(&vm_stat[item]);
242 }
243
244 static inline void __inc_zone_page_state(struct page *page,
245 enum zone_stat_item item)
246 {
247 __inc_zone_state(page_zone(page), item);
248 }
249
250 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
251 {
252 atomic_long_dec(&zone->vm_stat[item]);
253 atomic_long_dec(&vm_stat[item]);
254 }
255
256 static inline void __dec_zone_page_state(struct page *page,
257 enum zone_stat_item item)
258 {
259 __dec_zone_state(page_zone(page), item);
260 }
261
262 /*
263 * We only use atomic operations to update counters. So there is no need to
264 * disable interrupts.
265 */
266 #define inc_zone_page_state __inc_zone_page_state
267 #define dec_zone_page_state __dec_zone_page_state
268 #define mod_zone_page_state __mod_zone_page_state
269
270 static inline void refresh_cpu_vm_stats(int cpu) { }
271 #endif
272
273 #endif /* _LINUX_VMSTAT_H */
274
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