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#ifdef CONFIG_NUMA
40 PGSCAN_ZONE_RECLAIM_FAILED,
41#endif
42 PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
43 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
44#ifdef CONFIG_HUGETLB_PAGE
45 HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
46#endif
47 UNEVICTABLE_PGCULLED, /* culled to noreclaim list */
48 UNEVICTABLE_PGSCANNED, /* scanned for reclaimability */
49 UNEVICTABLE_PGRESCUED, /* rescued from noreclaim list */
50 UNEVICTABLE_PGMLOCKED,
51 UNEVICTABLE_PGMUNLOCKED,
52 UNEVICTABLE_PGCLEARED, /* on COW, page truncate */
53 UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */
54 UNEVICTABLE_MLOCKFREED,
55 NR_VM_EVENT_ITEMS
56};
57
58extern int sysctl_stat_interval;
59
60#ifdef CONFIG_VM_EVENT_COUNTERS
61/*
62 * Light weight per cpu counter implementation.
63 *
64 * Counters should only be incremented and no critical kernel component
65 * should rely on the counter values.
66 *
67 * Counters are handled completely inline. On many platforms the code
68 * generated will simply be the increment of a global address.
69 */
70
71struct vm_event_state {
72 unsigned long event[NR_VM_EVENT_ITEMS];
73};
74
75DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
76
77static inline void __count_vm_event(enum vm_event_item item)
78{
79 __get_cpu_var(vm_event_states).event[item]++;
80}
81
82static inline void count_vm_event(enum vm_event_item item)
83{
84 get_cpu_var(vm_event_states).event[item]++;
85 put_cpu();
86}
87
88static inline void __count_vm_events(enum vm_event_item item, long delta)
89{
90 __get_cpu_var(vm_event_states).event[item] += delta;
91}
92
93static inline void count_vm_events(enum vm_event_item item, long delta)
94{
95 get_cpu_var(vm_event_states).event[item] += delta;
96 put_cpu();
97}
98
99extern void all_vm_events(unsigned long *);
100#ifdef CONFIG_HOTPLUG
101extern void vm_events_fold_cpu(int cpu);
102#else
103static inline void vm_events_fold_cpu(int cpu)
104{
105}
106#endif
107
108#else
109
110/* Disable counters */
111static inline void count_vm_event(enum vm_event_item item)
112{
113}
114static inline void count_vm_events(enum vm_event_item item, long delta)
115{
116}
117static inline void __count_vm_event(enum vm_event_item item)
118{
119}
120static inline void __count_vm_events(enum vm_event_item item, long delta)
121{
122}
123static inline void all_vm_events(unsigned long *ret)
124{
125}
126static inline void vm_events_fold_cpu(int cpu)
127{
128}
129
130#endif /* CONFIG_VM_EVENT_COUNTERS */
131
132#define __count_zone_vm_events(item, zone, delta) \
133 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
134 zone_idx(zone), delta)
135
136/*
137 * Zone based page accounting with per cpu differentials.
138 */
139extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
140
141static inline void zone_page_state_add(long x, struct zone *zone,
142 enum zone_stat_item item)
143{
144 atomic_long_add(x, &zone->vm_stat[item]);
145 atomic_long_add(x, &vm_stat[item]);
146}
147
148static inline unsigned long global_page_state(enum zone_stat_item item)
149{
150 long x = atomic_long_read(&vm_stat[item]);
151#ifdef CONFIG_SMP
152 if (x < 0)
153 x = 0;
154#endif
155 return x;
156}
157
158static inline unsigned long zone_page_state(struct zone *zone,
159 enum zone_stat_item item)
160{
161 long x = atomic_long_read(&zone->vm_stat[item]);
162#ifdef CONFIG_SMP
163 if (x < 0)
164 x = 0;
165#endif
166 return x;
167}
168
169extern unsigned long global_reclaimable_pages(void);
170extern unsigned long zone_reclaimable_pages(struct zone *zone);
171
172#ifdef CONFIG_NUMA
173/*
174 * Determine the per node value of a stat item. This function
175 * is called frequently in a NUMA machine, so try to be as
176 * frugal as possible.
177 */
178static inline unsigned long node_page_state(int node,
179 enum zone_stat_item item)
180{
181 struct zone *zones = NODE_DATA(node)->node_zones;
182
183 return
184#ifdef CONFIG_ZONE_DMA
185 zone_page_state(&zones[ZONE_DMA], item) +
186#endif
187#ifdef CONFIG_ZONE_DMA32
188 zone_page_state(&zones[ZONE_DMA32], item) +
189#endif
190#ifdef CONFIG_HIGHMEM
191 zone_page_state(&zones[ZONE_HIGHMEM], item) +
192#endif
193 zone_page_state(&zones[ZONE_NORMAL], item) +
194 zone_page_state(&zones[ZONE_MOVABLE], item);
195}
196
197extern void zone_statistics(struct zone *, struct zone *);
198
199#else
200
201#define node_page_state(node, item) global_page_state(item)
202#define zone_statistics(_zl,_z) do { } while (0)
203
204#endif /* CONFIG_NUMA */
205
206#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
207#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
208
209static inline void zap_zone_vm_stats(struct zone *zone)
210{
211 memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
212}
213
214extern void inc_zone_state(struct zone *, enum zone_stat_item);
215
216#ifdef CONFIG_SMP
217void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
218void __inc_zone_page_state(struct page *, enum zone_stat_item);
219void __dec_zone_page_state(struct page *, enum zone_stat_item);
220
221void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
222void inc_zone_page_state(struct page *, enum zone_stat_item);
223void dec_zone_page_state(struct page *, enum zone_stat_item);
224
225extern void inc_zone_state(struct zone *, enum zone_stat_item);
226extern void __inc_zone_state(struct zone *, enum zone_stat_item);
227extern void dec_zone_state(struct zone *, enum zone_stat_item);
228extern void __dec_zone_state(struct zone *, enum zone_stat_item);
229
230void refresh_cpu_vm_stats(int);
231#else /* CONFIG_SMP */
232
233/*
234 * We do not maintain differentials in a single processor configuration.
235 * The functions directly modify the zone and global counters.
236 */
237static inline void __mod_zone_page_state(struct zone *zone,
238 enum zone_stat_item item, int delta)
239{
240 zone_page_state_add(delta, zone, item);
241}
242
243static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
244{
245 atomic_long_inc(&zone->vm_stat[item]);
246 atomic_long_inc(&vm_stat[item]);
247}
248
249static inline void __inc_zone_page_state(struct page *page,
250 enum zone_stat_item item)
251{
252 __inc_zone_state(page_zone(page), item);
253}
254
255static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
256{
257 atomic_long_dec(&zone->vm_stat[item]);
258 atomic_long_dec(&vm_stat[item]);
259}
260
261static inline void __dec_zone_page_state(struct page *page,
262 enum zone_stat_item item)
263{
264 __dec_zone_state(page_zone(page), item);
265}
266
267/*
268 * We only use atomic operations to update counters. So there is no need to
269 * disable interrupts.
270 */
271#define inc_zone_page_state __inc_zone_page_state
272#define dec_zone_page_state __dec_zone_page_state
273#define mod_zone_page_state __mod_zone_page_state
274
275static inline void refresh_cpu_vm_stats(int cpu) { }
276#endif
277
278#endif /* _LINUX_VMSTAT_H */