This source file includes following definitions.
- percpu_counter_compare
- percpu_counter_add
- percpu_counter_sum_positive
- percpu_counter_sum
- percpu_counter_read
- percpu_counter_read_positive
- percpu_counter_initialized
- percpu_counter_init
- percpu_counter_destroy
- percpu_counter_set
- percpu_counter_compare
- __percpu_counter_compare
- percpu_counter_add
- percpu_counter_add_batch
- percpu_counter_read
- percpu_counter_read_positive
- percpu_counter_sum_positive
- percpu_counter_sum
- percpu_counter_initialized
- percpu_counter_inc
- percpu_counter_dec
- percpu_counter_sub
1
2 #ifndef _LINUX_PERCPU_COUNTER_H
3 #define _LINUX_PERCPU_COUNTER_H
4
5
6
7
8
9
10 #include <linux/spinlock.h>
11 #include <linux/smp.h>
12 #include <linux/list.h>
13 #include <linux/threads.h>
14 #include <linux/percpu.h>
15 #include <linux/types.h>
16 #include <linux/gfp.h>
17
18 #ifdef CONFIG_SMP
19
20 struct percpu_counter {
21 raw_spinlock_t lock;
22 s64 count;
23 #ifdef CONFIG_HOTPLUG_CPU
24 struct list_head list;
25 #endif
26 s32 __percpu *counters;
27 };
28
29 extern int percpu_counter_batch;
30
31 int __percpu_counter_init(struct percpu_counter *fbc, s64 amount, gfp_t gfp,
32 struct lock_class_key *key);
33
34 #define percpu_counter_init(fbc, value, gfp) \
35 ({ \
36 static struct lock_class_key __key; \
37 \
38 __percpu_counter_init(fbc, value, gfp, &__key); \
39 })
40
41 void percpu_counter_destroy(struct percpu_counter *fbc);
42 void percpu_counter_set(struct percpu_counter *fbc, s64 amount);
43 void percpu_counter_add_batch(struct percpu_counter *fbc, s64 amount,
44 s32 batch);
45 s64 __percpu_counter_sum(struct percpu_counter *fbc);
46 int __percpu_counter_compare(struct percpu_counter *fbc, s64 rhs, s32 batch);
47
48 static inline int percpu_counter_compare(struct percpu_counter *fbc, s64 rhs)
49 {
50 return __percpu_counter_compare(fbc, rhs, percpu_counter_batch);
51 }
52
53 static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount)
54 {
55 percpu_counter_add_batch(fbc, amount, percpu_counter_batch);
56 }
57
58 static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
59 {
60 s64 ret = __percpu_counter_sum(fbc);
61 return ret < 0 ? 0 : ret;
62 }
63
64 static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
65 {
66 return __percpu_counter_sum(fbc);
67 }
68
69 static inline s64 percpu_counter_read(struct percpu_counter *fbc)
70 {
71 return fbc->count;
72 }
73
74
75
76
77
78
79 static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)
80 {
81
82 s64 ret = READ_ONCE(fbc->count);
83
84 if (ret >= 0)
85 return ret;
86 return 0;
87 }
88
89 static inline bool percpu_counter_initialized(struct percpu_counter *fbc)
90 {
91 return (fbc->counters != NULL);
92 }
93
94 #else
95
96 struct percpu_counter {
97 s64 count;
98 };
99
100 static inline int percpu_counter_init(struct percpu_counter *fbc, s64 amount,
101 gfp_t gfp)
102 {
103 fbc->count = amount;
104 return 0;
105 }
106
107 static inline void percpu_counter_destroy(struct percpu_counter *fbc)
108 {
109 }
110
111 static inline void percpu_counter_set(struct percpu_counter *fbc, s64 amount)
112 {
113 fbc->count = amount;
114 }
115
116 static inline int percpu_counter_compare(struct percpu_counter *fbc, s64 rhs)
117 {
118 if (fbc->count > rhs)
119 return 1;
120 else if (fbc->count < rhs)
121 return -1;
122 else
123 return 0;
124 }
125
126 static inline int
127 __percpu_counter_compare(struct percpu_counter *fbc, s64 rhs, s32 batch)
128 {
129 return percpu_counter_compare(fbc, rhs);
130 }
131
132 static inline void
133 percpu_counter_add(struct percpu_counter *fbc, s64 amount)
134 {
135 preempt_disable();
136 fbc->count += amount;
137 preempt_enable();
138 }
139
140 static inline void
141 percpu_counter_add_batch(struct percpu_counter *fbc, s64 amount, s32 batch)
142 {
143 percpu_counter_add(fbc, amount);
144 }
145
146 static inline s64 percpu_counter_read(struct percpu_counter *fbc)
147 {
148 return fbc->count;
149 }
150
151
152
153
154
155 static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)
156 {
157 return fbc->count;
158 }
159
160 static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
161 {
162 return percpu_counter_read_positive(fbc);
163 }
164
165 static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
166 {
167 return percpu_counter_read(fbc);
168 }
169
170 static inline bool percpu_counter_initialized(struct percpu_counter *fbc)
171 {
172 return true;
173 }
174
175 #endif
176
177 static inline void percpu_counter_inc(struct percpu_counter *fbc)
178 {
179 percpu_counter_add(fbc, 1);
180 }
181
182 static inline void percpu_counter_dec(struct percpu_counter *fbc)
183 {
184 percpu_counter_add(fbc, -1);
185 }
186
187 static inline void percpu_counter_sub(struct percpu_counter *fbc, s64 amount)
188 {
189 percpu_counter_add(fbc, -amount);
190 }
191
192 #endif