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/config.h>
7#include <linux/mmzone.h>
8#include <asm/atomic.h>
9
10#ifdef CONFIG_VM_EVENT_COUNTERS
11/*
12 * Light weight per cpu counter implementation.
13 *
14 * Counters should only be incremented and no critical kernel component
15 * should rely on the counter values.
16 *
17 * Counters are handled completely inline. On many platforms the code
18 * generated will simply be the increment of a global address.
19 */
20
21#define FOR_ALL_ZONES(x) x##_DMA, x##_DMA32, x##_NORMAL, x##_HIGH
22
23enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
24 FOR_ALL_ZONES(PGALLOC),
25 PGFREE, PGACTIVATE, PGDEACTIVATE,
26 PGFAULT, PGMAJFAULT,
27 FOR_ALL_ZONES(PGREFILL),
28 FOR_ALL_ZONES(PGSTEAL),
29 FOR_ALL_ZONES(PGSCAN_KSWAPD),
30 FOR_ALL_ZONES(PGSCAN_DIRECT),
31 PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
32 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
33 NR_VM_EVENT_ITEMS
34};
35
36struct vm_event_state {
37 unsigned long event[NR_VM_EVENT_ITEMS];
38};
39
40DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
41
42static inline void __count_vm_event(enum vm_event_item item)
43{
44 __get_cpu_var(vm_event_states).event[item]++;
45}
46
47static inline void count_vm_event(enum vm_event_item item)
48{
49 get_cpu_var(vm_event_states).event[item]++;
50 put_cpu();
51}
52
53static inline void __count_vm_events(enum vm_event_item item, long delta)
54{
55 __get_cpu_var(vm_event_states).event[item] += delta;
56}
57
58static inline void count_vm_events(enum vm_event_item item, long delta)
59{
60 get_cpu_var(vm_event_states).event[item] += delta;
61 put_cpu();
62}
63
64extern void all_vm_events(unsigned long *);
65extern void vm_events_fold_cpu(int cpu);
66
67#else
68
69/* Disable counters */
70#define get_cpu_vm_events(e) 0L
71#define count_vm_event(e) do { } while (0)
72#define count_vm_events(e,d) do { } while (0)
73#define __count_vm_event(e) do { } while (0)
74#define __count_vm_events(e,d) do { } while (0)
75#define vm_events_fold_cpu(x) do { } while (0)
76
77#endif /* CONFIG_VM_EVENT_COUNTERS */
78
79#define __count_zone_vm_events(item, zone, delta) \
80 __count_vm_events(item##_DMA + zone_idx(zone), delta)
81
82/*
83 * Zone based page accounting with per cpu differentials.
84 */
85extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
86
87static inline void zone_page_state_add(long x, struct zone *zone,
88 enum zone_stat_item item)
89{
90 atomic_long_add(x, &zone->vm_stat[item]);
91 atomic_long_add(x, &vm_stat[item]);
92}
93
94static inline unsigned long global_page_state(enum zone_stat_item item)
95{
96 long x = atomic_long_read(&vm_stat[item]);
97#ifdef CONFIG_SMP
98 if (x < 0)
99 x = 0;
100#endif
101 return x;
102}
103
104static inline unsigned long zone_page_state(struct zone *zone,
105 enum zone_stat_item item)
106{
107 long x = atomic_long_read(&zone->vm_stat[item]);
108#ifdef CONFIG_SMP
109 if (x < 0)
110 x = 0;
111#endif
112 return x;
113}
114
115#ifdef CONFIG_NUMA
116/*
117 * Determine the per node value of a stat item. This function
118 * is called frequently in a NUMA machine, so try to be as
119 * frugal as possible.
120 */
121static inline unsigned long node_page_state(int node,
122 enum zone_stat_item item)
123{
124 struct zone *zones = NODE_DATA(node)->node_zones;
125
126 return
127#ifndef CONFIG_DMA_IS_NORMAL
128#if !defined(CONFIG_DMA_IS_DMA32) && BITS_PER_LONG >= 64
129 zone_page_state(&zones[ZONE_DMA32], item) +
130#endif
131 zone_page_state(&zones[ZONE_NORMAL], item) +
132#endif
133#ifdef CONFIG_HIGHMEM
134 zone_page_state(&zones[ZONE_HIGHMEM], item) +
135#endif
136 zone_page_state(&zones[ZONE_DMA], item);
137}
138
139extern void zone_statistics(struct zonelist *, struct zone *);
140
141#else
142
143#define node_page_state(node, item) global_page_state(item)
144#define zone_statistics(_zl,_z) do { } while (0)
145
146#endif /* CONFIG_NUMA */
147
148#define __add_zone_page_state(__z, __i, __d) \
149 __mod_zone_page_state(__z, __i, __d)
150#define __sub_zone_page_state(__z, __i, __d) \
151 __mod_zone_page_state(__z, __i,-(__d))
152
153#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
154#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
155
156static inline void zap_zone_vm_stats(struct zone *zone)
157{
158 memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
159}
160
161extern void inc_zone_state(struct zone *, enum zone_stat_item);
162
163#ifdef CONFIG_SMP
164void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
165void __inc_zone_page_state(struct page *, enum zone_stat_item);
166void __dec_zone_page_state(struct page *, enum zone_stat_item);
167
168void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
169void inc_zone_page_state(struct page *, enum zone_stat_item);
170void dec_zone_page_state(struct page *, enum zone_stat_item);
171
172extern void inc_zone_state(struct zone *, enum zone_stat_item);
173
174void refresh_cpu_vm_stats(int);
175void refresh_vm_stats(void);
176
177#else /* CONFIG_SMP */
178
179/*
180 * We do not maintain differentials in a single processor configuration.
181 * The functions directly modify the zone and global counters.
182 */
183static inline void __mod_zone_page_state(struct zone *zone,
184 enum zone_stat_item item, int delta)
185{
186 zone_page_state_add(delta, zone, item);
187}
188
189static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
190{
191 atomic_long_inc(&zone->vm_stat[item]);
192 atomic_long_inc(&vm_stat[item]);
193}
194
195static inline void __inc_zone_page_state(struct page *page,
196 enum zone_stat_item item)
197{
198 __inc_zone_state(page_zone(page), item);
199}
200
201static inline void __dec_zone_page_state(struct page *page,
202 enum zone_stat_item item)
203{
204 atomic_long_dec(&page_zone(page)->vm_stat[item]);
205 atomic_long_dec(&vm_stat[item]);
206}
207
208/*
209 * We only use atomic operations to update counters. So there is no need to
210 * disable interrupts.
211 */
212#define inc_zone_page_state __inc_zone_page_state
213#define dec_zone_page_state __dec_zone_page_state
214#define mod_zone_page_state __mod_zone_page_state
215
216static inline void refresh_cpu_vm_stats(int cpu) { }
217static inline void refresh_vm_stats(void) { }
218#endif
219
220#endif /* _LINUX_VMSTAT_H */