xref: /linux-6.15/include/linux/vmstat.h (revision 2d6ffcca)
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 
29 #define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx) , xx##_MOVABLE
30 
31 enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
32 		FOR_ALL_ZONES(PGALLOC),
33 		PGFREE, PGACTIVATE, PGDEACTIVATE,
34 		PGFAULT, PGMAJFAULT,
35 		FOR_ALL_ZONES(PGREFILL),
36 		FOR_ALL_ZONES(PGSTEAL),
37 		FOR_ALL_ZONES(PGSCAN_KSWAPD),
38 		FOR_ALL_ZONES(PGSCAN_DIRECT),
39 		PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
40 		PAGEOUTRUN, ALLOCSTALL, PGROTATED,
41 #ifdef CONFIG_HUGETLB_PAGE
42 		HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
43 #endif
44 		NR_VM_EVENT_ITEMS
45 };
46 
47 extern const struct seq_operations fragmentation_op;
48 extern const struct seq_operations pagetypeinfo_op;
49 extern const struct seq_operations zoneinfo_op;
50 extern const struct seq_operations vmstat_op;
51 extern int sysctl_stat_interval;
52 
53 #ifdef CONFIG_VM_EVENT_COUNTERS
54 /*
55  * Light weight per cpu counter implementation.
56  *
57  * Counters should only be incremented and no critical kernel component
58  * should rely on the counter values.
59  *
60  * Counters are handled completely inline. On many platforms the code
61  * generated will simply be the increment of a global address.
62  */
63 
64 struct vm_event_state {
65 	unsigned long event[NR_VM_EVENT_ITEMS];
66 };
67 
68 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
69 
70 static inline void __count_vm_event(enum vm_event_item item)
71 {
72 	__get_cpu_var(vm_event_states).event[item]++;
73 }
74 
75 static inline void count_vm_event(enum vm_event_item item)
76 {
77 	get_cpu_var(vm_event_states).event[item]++;
78 	put_cpu();
79 }
80 
81 static inline void __count_vm_events(enum vm_event_item item, long delta)
82 {
83 	__get_cpu_var(vm_event_states).event[item] += delta;
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 zone *, 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