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 <linux/vm_event_item.h>
9 #include <linux/atomic.h>
10
11 extern int sysctl_stat_interval;
12
13 #ifdef CONFIG_VM_EVENT_COUNTERS
14 /*
15 * Light weight per cpu counter implementation.
16 *
17 * Counters should only be incremented and no critical kernel component
18 * should rely on the counter values.
19 *
20 * Counters are handled completely inline. On many platforms the code
21 * generated will simply be the increment of a global address.
22 */
23
24 struct vm_event_state {
25 unsigned long event[NR_VM_EVENT_ITEMS];
26 };
27
28 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
29
30 /*
31 * vm counters are allowed to be racy. Use raw_cpu_ops to avoid the
32 * local_irq_disable overhead.
33 */
__count_vm_event(enum vm_event_item item)34 static inline void __count_vm_event(enum vm_event_item item)
35 {
36 raw_cpu_inc(vm_event_states.event[item]);
37 }
38
count_vm_event(enum vm_event_item item)39 static inline void count_vm_event(enum vm_event_item item)
40 {
41 this_cpu_inc(vm_event_states.event[item]);
42 }
43
__count_vm_events(enum vm_event_item item,long delta)44 static inline void __count_vm_events(enum vm_event_item item, long delta)
45 {
46 raw_cpu_add(vm_event_states.event[item], delta);
47 }
48
count_vm_events(enum vm_event_item item,long delta)49 static inline void count_vm_events(enum vm_event_item item, long delta)
50 {
51 this_cpu_add(vm_event_states.event[item], delta);
52 }
53
54 extern void all_vm_events(unsigned long *);
55
56 extern void vm_events_fold_cpu(int cpu);
57
58 #else
59
60 /* Disable counters */
count_vm_event(enum vm_event_item item)61 static inline void count_vm_event(enum vm_event_item item)
62 {
63 }
count_vm_events(enum vm_event_item item,long delta)64 static inline void count_vm_events(enum vm_event_item item, long delta)
65 {
66 }
__count_vm_event(enum vm_event_item item)67 static inline void __count_vm_event(enum vm_event_item item)
68 {
69 }
__count_vm_events(enum vm_event_item item,long delta)70 static inline void __count_vm_events(enum vm_event_item item, long delta)
71 {
72 }
all_vm_events(unsigned long * ret)73 static inline void all_vm_events(unsigned long *ret)
74 {
75 }
vm_events_fold_cpu(int cpu)76 static inline void vm_events_fold_cpu(int cpu)
77 {
78 }
79
80 #endif /* CONFIG_VM_EVENT_COUNTERS */
81
82 #ifdef CONFIG_NUMA_BALANCING
83 #define count_vm_numa_event(x) count_vm_event(x)
84 #define count_vm_numa_events(x, y) count_vm_events(x, y)
85 #else
86 #define count_vm_numa_event(x) do {} while (0)
87 #define count_vm_numa_events(x, y) do { (void)(y); } while (0)
88 #endif /* CONFIG_NUMA_BALANCING */
89
90 #ifdef CONFIG_DEBUG_TLBFLUSH
91 #define count_vm_tlb_event(x) count_vm_event(x)
92 #define count_vm_tlb_events(x, y) count_vm_events(x, y)
93 #else
94 #define count_vm_tlb_event(x) do {} while (0)
95 #define count_vm_tlb_events(x, y) do { (void)(y); } while (0)
96 #endif
97
98 #ifdef CONFIG_DEBUG_VM_VMACACHE
99 #define count_vm_vmacache_event(x) count_vm_event(x)
100 #else
101 #define count_vm_vmacache_event(x) do {} while (0)
102 #endif
103
104 #define __count_zone_vm_events(item, zone, delta) \
105 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
106 zone_idx(zone), delta)
107
108 /*
109 * Zone based page accounting with per cpu differentials.
110 */
111 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
112
zone_page_state_add(long x,struct zone * zone,enum zone_stat_item item)113 static inline void zone_page_state_add(long x, struct zone *zone,
114 enum zone_stat_item item)
115 {
116 atomic_long_add(x, &zone->vm_stat[item]);
117 atomic_long_add(x, &vm_stat[item]);
118 }
119
global_page_state(enum zone_stat_item item)120 static inline unsigned long global_page_state(enum zone_stat_item item)
121 {
122 long x = atomic_long_read(&vm_stat[item]);
123 #ifdef CONFIG_SMP
124 if (x < 0)
125 x = 0;
126 #endif
127 return x;
128 }
129
zone_page_state(struct zone * zone,enum zone_stat_item item)130 static inline unsigned long zone_page_state(struct zone *zone,
131 enum zone_stat_item item)
132 {
133 long x = atomic_long_read(&zone->vm_stat[item]);
134 #ifdef CONFIG_SMP
135 if (x < 0)
136 x = 0;
137 #endif
138 return x;
139 }
140
141 /*
142 * More accurate version that also considers the currently pending
143 * deltas. For that we need to loop over all cpus to find the current
144 * deltas. There is no synchronization so the result cannot be
145 * exactly accurate either.
146 */
zone_page_state_snapshot(struct zone * zone,enum zone_stat_item item)147 static inline unsigned long zone_page_state_snapshot(struct zone *zone,
148 enum zone_stat_item item)
149 {
150 long x = atomic_long_read(&zone->vm_stat[item]);
151
152 #ifdef CONFIG_SMP
153 int cpu;
154 for_each_online_cpu(cpu)
155 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
156
157 if (x < 0)
158 x = 0;
159 #endif
160 return x;
161 }
162
163 #ifdef CONFIG_NUMA
164
165 extern unsigned long node_page_state(int node, enum zone_stat_item item);
166 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp);
167
168 #else
169
170 #define node_page_state(node, item) global_page_state(item)
171 #define zone_statistics(_zl, _z, gfp) do { } while (0)
172
173 #endif /* CONFIG_NUMA */
174
175 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
176 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
177
178 #ifdef CONFIG_SMP
179 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long);
180 void __inc_zone_page_state(struct page *, enum zone_stat_item);
181 void __dec_zone_page_state(struct page *, enum zone_stat_item);
182
183 void mod_zone_page_state(struct zone *, enum zone_stat_item, long);
184 void inc_zone_page_state(struct page *, enum zone_stat_item);
185 void dec_zone_page_state(struct page *, enum zone_stat_item);
186
187 extern void inc_zone_state(struct zone *, enum zone_stat_item);
188 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
189 extern void dec_zone_state(struct zone *, enum zone_stat_item);
190 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
191
192 void quiet_vmstat(void);
193 void cpu_vm_stats_fold(int cpu);
194 void refresh_zone_stat_thresholds(void);
195
196 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
197
198 int calculate_pressure_threshold(struct zone *zone);
199 int calculate_normal_threshold(struct zone *zone);
200 void set_pgdat_percpu_threshold(pg_data_t *pgdat,
201 int (*calculate_pressure)(struct zone *));
202 #else /* CONFIG_SMP */
203
204 /*
205 * We do not maintain differentials in a single processor configuration.
206 * The functions directly modify the zone and global counters.
207 */
__mod_zone_page_state(struct zone * zone,enum zone_stat_item item,long delta)208 static inline void __mod_zone_page_state(struct zone *zone,
209 enum zone_stat_item item, long delta)
210 {
211 zone_page_state_add(delta, zone, item);
212 }
213
__inc_zone_state(struct zone * zone,enum zone_stat_item item)214 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
215 {
216 atomic_long_inc(&zone->vm_stat[item]);
217 atomic_long_inc(&vm_stat[item]);
218 }
219
__dec_zone_state(struct zone * zone,enum zone_stat_item item)220 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
221 {
222 atomic_long_dec(&zone->vm_stat[item]);
223 atomic_long_dec(&vm_stat[item]);
224 }
225
__inc_zone_page_state(struct page * page,enum zone_stat_item item)226 static inline void __inc_zone_page_state(struct page *page,
227 enum zone_stat_item item)
228 {
229 __inc_zone_state(page_zone(page), item);
230 }
231
__dec_zone_page_state(struct page * page,enum zone_stat_item item)232 static inline void __dec_zone_page_state(struct page *page,
233 enum zone_stat_item item)
234 {
235 __dec_zone_state(page_zone(page), item);
236 }
237
238 /*
239 * We only use atomic operations to update counters. So there is no need to
240 * disable interrupts.
241 */
242 #define inc_zone_page_state __inc_zone_page_state
243 #define dec_zone_page_state __dec_zone_page_state
244 #define mod_zone_page_state __mod_zone_page_state
245
246 #define inc_zone_state __inc_zone_state
247 #define dec_zone_state __dec_zone_state
248
249 #define set_pgdat_percpu_threshold(pgdat, callback) { }
250
refresh_zone_stat_thresholds(void)251 static inline void refresh_zone_stat_thresholds(void) { }
cpu_vm_stats_fold(int cpu)252 static inline void cpu_vm_stats_fold(int cpu) { }
quiet_vmstat(void)253 static inline void quiet_vmstat(void) { }
254
drain_zonestat(struct zone * zone,struct per_cpu_pageset * pset)255 static inline void drain_zonestat(struct zone *zone,
256 struct per_cpu_pageset *pset) { }
257 #endif /* CONFIG_SMP */
258
__mod_zone_freepage_state(struct zone * zone,int nr_pages,int migratetype)259 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
260 int migratetype)
261 {
262 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
263 if (is_migrate_cma(migratetype))
264 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
265 }
266
267 extern const char * const vmstat_text[];
268
269 #endif /* _LINUX_VMSTAT_H */
270