Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
31enum 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
47extern const struct seq_operations fragmentation_op;
48extern const struct seq_operations pagetypeinfo_op;
49extern const struct seq_operations zoneinfo_op;
50extern const struct seq_operations vmstat_op;
51extern 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
64struct vm_event_state {
65 unsigned long event[NR_VM_EVENT_ITEMS];
66};
67
68DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
69
70static inline void __count_vm_event(enum vm_event_item item)
71{
72 __get_cpu_var(vm_event_states).event[item]++;
73}
74
75static 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
81static 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
86static 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
92extern void all_vm_events(unsigned long *);
93#ifdef CONFIG_HOTPLUG
94extern void vm_events_fold_cpu(int cpu);
95#else
96static inline void vm_events_fold_cpu(int cpu)
97{
98}
99#endif
100
101#else
102
103/* Disable counters */
104static inline void count_vm_event(enum vm_event_item item)
105{
106}
107static inline void count_vm_events(enum vm_event_item item, long delta)
108{
109}
110static inline void __count_vm_event(enum vm_event_item item)
111{
112}
113static inline void __count_vm_events(enum vm_event_item item, long delta)
114{
115}
116static inline void all_vm_events(unsigned long *ret)
117{
118}
119static 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 */
132extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
133
134static 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
141static 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
151static 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 */
168static 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
187extern 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
204static inline void zap_zone_vm_stats(struct zone *zone)
205{
206 memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
207}
208
209extern void inc_zone_state(struct zone *, enum zone_stat_item);
210
211#ifdef CONFIG_SMP
212void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
213void __inc_zone_page_state(struct page *, enum zone_stat_item);
214void __dec_zone_page_state(struct page *, enum zone_stat_item);
215
216void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
217void inc_zone_page_state(struct page *, enum zone_stat_item);
218void dec_zone_page_state(struct page *, enum zone_stat_item);
219
220extern void inc_zone_state(struct zone *, enum zone_stat_item);
221extern void __inc_zone_state(struct zone *, enum zone_stat_item);
222extern void dec_zone_state(struct zone *, enum zone_stat_item);
223extern void __dec_zone_state(struct zone *, enum zone_stat_item);
224
225void 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 */
232static 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
238static 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
244static 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
250static 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
256static 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
270static inline void refresh_cpu_vm_stats(int cpu) { }
271#endif
272
273#endif /* _LINUX_VMSTAT_H */