Linux kernel mirror (for testing)
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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
47#ifdef CONFIG_VM_EVENT_COUNTERS
48/*
49 * Light weight per cpu counter implementation.
50 *
51 * Counters should only be incremented and no critical kernel component
52 * should rely on the counter values.
53 *
54 * Counters are handled completely inline. On many platforms the code
55 * generated will simply be the increment of a global address.
56 */
57
58struct vm_event_state {
59 unsigned long event[NR_VM_EVENT_ITEMS];
60};
61
62DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
63
64static inline void __count_vm_event(enum vm_event_item item)
65{
66 __get_cpu_var(vm_event_states).event[item]++;
67}
68
69static inline void count_vm_event(enum vm_event_item item)
70{
71 get_cpu_var(vm_event_states).event[item]++;
72 put_cpu();
73}
74
75static inline void __count_vm_events(enum vm_event_item item, long delta)
76{
77 __get_cpu_var(vm_event_states).event[item] += delta;
78}
79
80static inline void count_vm_events(enum vm_event_item item, long delta)
81{
82 get_cpu_var(vm_event_states).event[item] += delta;
83 put_cpu();
84}
85
86extern void all_vm_events(unsigned long *);
87#ifdef CONFIG_HOTPLUG
88extern void vm_events_fold_cpu(int cpu);
89#else
90static inline void vm_events_fold_cpu(int cpu)
91{
92}
93#endif
94
95#else
96
97/* Disable counters */
98static inline void count_vm_event(enum vm_event_item item)
99{
100}
101static inline void count_vm_events(enum vm_event_item item, long delta)
102{
103}
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 all_vm_events(unsigned long *ret)
111{
112}
113static inline void vm_events_fold_cpu(int cpu)
114{
115}
116
117#endif /* CONFIG_VM_EVENT_COUNTERS */
118
119#define __count_zone_vm_events(item, zone, delta) \
120 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
121 zone_idx(zone), delta)
122
123/*
124 * Zone based page accounting with per cpu differentials.
125 */
126extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
127
128static inline void zone_page_state_add(long x, struct zone *zone,
129 enum zone_stat_item item)
130{
131 atomic_long_add(x, &zone->vm_stat[item]);
132 atomic_long_add(x, &vm_stat[item]);
133}
134
135static inline unsigned long global_page_state(enum zone_stat_item item)
136{
137 long x = atomic_long_read(&vm_stat[item]);
138#ifdef CONFIG_SMP
139 if (x < 0)
140 x = 0;
141#endif
142 return x;
143}
144
145static inline unsigned long zone_page_state(struct zone *zone,
146 enum zone_stat_item item)
147{
148 long x = atomic_long_read(&zone->vm_stat[item]);
149#ifdef CONFIG_SMP
150 if (x < 0)
151 x = 0;
152#endif
153 return x;
154}
155
156#ifdef CONFIG_NUMA
157/*
158 * Determine the per node value of a stat item. This function
159 * is called frequently in a NUMA machine, so try to be as
160 * frugal as possible.
161 */
162static inline unsigned long node_page_state(int node,
163 enum zone_stat_item item)
164{
165 struct zone *zones = NODE_DATA(node)->node_zones;
166
167 return
168#ifdef CONFIG_ZONE_DMA
169 zone_page_state(&zones[ZONE_DMA], item) +
170#endif
171#ifdef CONFIG_ZONE_DMA32
172 zone_page_state(&zones[ZONE_DMA32], item) +
173#endif
174#ifdef CONFIG_HIGHMEM
175 zone_page_state(&zones[ZONE_HIGHMEM], item) +
176#endif
177 zone_page_state(&zones[ZONE_NORMAL], item) +
178 zone_page_state(&zones[ZONE_MOVABLE], item);
179}
180
181extern void zone_statistics(struct zone *, struct zone *);
182
183#else
184
185#define node_page_state(node, item) global_page_state(item)
186#define zone_statistics(_zl,_z) do { } while (0)
187
188#endif /* CONFIG_NUMA */
189
190#define __add_zone_page_state(__z, __i, __d) \
191 __mod_zone_page_state(__z, __i, __d)
192#define __sub_zone_page_state(__z, __i, __d) \
193 __mod_zone_page_state(__z, __i,-(__d))
194
195#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
196#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
197
198static inline void zap_zone_vm_stats(struct zone *zone)
199{
200 memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
201}
202
203extern void inc_zone_state(struct zone *, enum zone_stat_item);
204
205#ifdef CONFIG_SMP
206void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
207void __inc_zone_page_state(struct page *, enum zone_stat_item);
208void __dec_zone_page_state(struct page *, enum zone_stat_item);
209
210void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
211void inc_zone_page_state(struct page *, enum zone_stat_item);
212void dec_zone_page_state(struct page *, enum zone_stat_item);
213
214extern void inc_zone_state(struct zone *, enum zone_stat_item);
215extern void __inc_zone_state(struct zone *, enum zone_stat_item);
216extern void dec_zone_state(struct zone *, enum zone_stat_item);
217extern void __dec_zone_state(struct zone *, enum zone_stat_item);
218
219void refresh_cpu_vm_stats(int);
220#else /* CONFIG_SMP */
221
222/*
223 * We do not maintain differentials in a single processor configuration.
224 * The functions directly modify the zone and global counters.
225 */
226static inline void __mod_zone_page_state(struct zone *zone,
227 enum zone_stat_item item, int delta)
228{
229 zone_page_state_add(delta, zone, item);
230}
231
232static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
233{
234 atomic_long_inc(&zone->vm_stat[item]);
235 atomic_long_inc(&vm_stat[item]);
236}
237
238static inline void __inc_zone_page_state(struct page *page,
239 enum zone_stat_item item)
240{
241 __inc_zone_state(page_zone(page), item);
242}
243
244static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
245{
246 atomic_long_dec(&zone->vm_stat[item]);
247 atomic_long_dec(&vm_stat[item]);
248}
249
250static inline void __dec_zone_page_state(struct page *page,
251 enum zone_stat_item item)
252{
253 __dec_zone_state(page_zone(page), item);
254}
255
256/*
257 * We only use atomic operations to update counters. So there is no need to
258 * disable interrupts.
259 */
260#define inc_zone_page_state __inc_zone_page_state
261#define dec_zone_page_state __dec_zone_page_state
262#define mod_zone_page_state __mod_zone_page_state
263
264static inline void refresh_cpu_vm_stats(int cpu) { }
265#endif
266
267#endif /* _LINUX_VMSTAT_H */