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[/] [test_project/] [trunk/] [linux_sd_driver/] [include/] [linux/] [percpu_counter.h] - Blame information for rev 81

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#ifndef _LINUX_PERCPU_COUNTER_H
#define _LINUX_PERCPU_COUNTER_H
/*
 * A simple "approximate counter" for use in ext2 and ext3 superblocks.
 *
 * WARNING: these things are HUGE.  4 kbytes per counter on 32-way P4.
 */
 
#include <linux/spinlock.h>
#include <linux/smp.h>
#include <linux/list.h>
#include <linux/threads.h>
#include <linux/percpu.h>
#include <linux/types.h>
 
#ifdef CONFIG_SMP
 
struct percpu_counter {
        spinlock_t lock;
        s64 count;
#ifdef CONFIG_HOTPLUG_CPU
        struct list_head list;  /* All percpu_counters are on a list */
#endif
        s32 *counters;
};
 
#if NR_CPUS >= 16
#define FBC_BATCH       (NR_CPUS*2)
#else
#define FBC_BATCH       (NR_CPUS*4)
#endif
 
int percpu_counter_init(struct percpu_counter *fbc, s64 amount);
int percpu_counter_init_irq(struct percpu_counter *fbc, s64 amount);
void percpu_counter_destroy(struct percpu_counter *fbc);
void percpu_counter_set(struct percpu_counter *fbc, s64 amount);
void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch);
s64 __percpu_counter_sum(struct percpu_counter *fbc);
 
static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount)
{
        __percpu_counter_add(fbc, amount, FBC_BATCH);
}
 
static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
{
        s64 ret = __percpu_counter_sum(fbc);
        return ret < 0 ? 0 : ret;
}
 
static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
{
        return __percpu_counter_sum(fbc);
}
 
static inline s64 percpu_counter_read(struct percpu_counter *fbc)
{
        return fbc->count;
}
 
/*
 * It is possible for the percpu_counter_read() to return a small negative
 * number for some counter which should never be negative.
 *
 */
static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)
{
        s64 ret = fbc->count;
 
        barrier();              /* Prevent reloads of fbc->count */
        if (ret >= 0)
                return ret;
        return 1;
}
 
#else
 
struct percpu_counter {
        s64 count;
};
 
static inline int percpu_counter_init(struct percpu_counter *fbc, s64 amount)
{
        fbc->count = amount;
        return 0;
}
 
#define percpu_counter_init_irq percpu_counter_init
 
static inline void percpu_counter_destroy(struct percpu_counter *fbc)
{
}
 
static inline void percpu_counter_set(struct percpu_counter *fbc, s64 amount)
{
        fbc->count = amount;
}
 
#define __percpu_counter_add(fbc, amount, batch) \
        percpu_counter_add(fbc, amount)
 
static inline void
percpu_counter_add(struct percpu_counter *fbc, s64 amount)
{
        preempt_disable();
        fbc->count += amount;
        preempt_enable();
}
 
static inline s64 percpu_counter_read(struct percpu_counter *fbc)
{
        return fbc->count;
}
 
static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)
{
        return fbc->count;
}
 
static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
{
        return percpu_counter_read_positive(fbc);
}
 
static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
{
        return percpu_counter_read(fbc);
}
 
#endif  /* CONFIG_SMP */
 
static inline void percpu_counter_inc(struct percpu_counter *fbc)
{
        percpu_counter_add(fbc, 1);
}
 
static inline void percpu_counter_dec(struct percpu_counter *fbc)
{
        percpu_counter_add(fbc, -1);
}
 
static inline void percpu_counter_sub(struct percpu_counter *fbc, s64 amount)
{
        percpu_counter_add(fbc, -amount);
}
 
#endif /* _LINUX_PERCPU_COUNTER_H */

Line No.	Rev	Author	Line
1	62	marcus.erl	`#ifndef _LINUX_PERCPU_COUNTER_H`
2			`#define _LINUX_PERCPU_COUNTER_H`
3			`/*`
4			`* A simple "approximate counter" for use in ext2 and ext3 superblocks.`
5			`*`
6			`* WARNING: these things are HUGE. 4 kbytes per counter on 32-way P4.`
7			`*/`
8
9			`#include <linux/spinlock.h>`
10			`#include <linux/smp.h>`
11			`#include <linux/list.h>`
12			`#include <linux/threads.h>`
13			`#include <linux/percpu.h>`
14			`#include <linux/types.h>`
15
16			`#ifdef CONFIG_SMP`
17
18			`struct percpu_counter {`
19			`spinlock_t lock;`
20			`s64 count;`
21			`#ifdef CONFIG_HOTPLUG_CPU`
22			`struct list_head list; /* All percpu_counters are on a list */`
23			`#endif`
24			`s32 *counters;`
25			`};`
26
27			`#if NR_CPUS >= 16`
28			`#define FBC_BATCH (NR_CPUS*2)`
29			`#else`
30			`#define FBC_BATCH (NR_CPUS*4)`
31			`#endif`
32
33			`int percpu_counter_init(struct percpu_counter *fbc, s64 amount);`
34			`int percpu_counter_init_irq(struct percpu_counter *fbc, s64 amount);`
35			`void percpu_counter_destroy(struct percpu_counter *fbc);`
36			`void percpu_counter_set(struct percpu_counter *fbc, s64 amount);`
37			`void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch);`
38			`s64 __percpu_counter_sum(struct percpu_counter *fbc);`
39
40			`static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount)`
41			`{`
42			`__percpu_counter_add(fbc, amount, FBC_BATCH);`
43			`}`
44
45			`static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)`
46			`{`
47			`s64 ret = __percpu_counter_sum(fbc);`
48			`return ret < 0 ? 0 : ret;`
49			`}`
50
51			`static inline s64 percpu_counter_sum(struct percpu_counter *fbc)`
52			`{`
53			`return __percpu_counter_sum(fbc);`
54			`}`
55
56			`static inline s64 percpu_counter_read(struct percpu_counter *fbc)`
57			`{`
58			`return fbc->count;`
59			`}`
60
61			`/*`
62			`* It is possible for the percpu_counter_read() to return a small negative`
63			`* number for some counter which should never be negative.`
64			`*`
65			`*/`
66			`static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)`
67			`{`
68			`s64 ret = fbc->count;`
69
70			`barrier(); /* Prevent reloads of fbc->count */`
71			`if (ret >= 0)`
72			`return ret;`
73			`return 1;`
74			`}`
75
76			`#else`
77
78			`struct percpu_counter {`
79			`s64 count;`
80			`};`
81
82			`static inline int percpu_counter_init(struct percpu_counter *fbc, s64 amount)`
83			`{`
84			`fbc->count = amount;`
85			`return 0;`
86			`}`
87
88			`#define percpu_counter_init_irq percpu_counter_init`
89
90			`static inline void percpu_counter_destroy(struct percpu_counter *fbc)`
91			`{`
92			`}`
93
94			`static inline void percpu_counter_set(struct percpu_counter *fbc, s64 amount)`
95			`{`
96			`fbc->count = amount;`
97			`}`
98
99			`#define __percpu_counter_add(fbc, amount, batch) \`
100			`percpu_counter_add(fbc, amount)`
101
102			`static inline void`
103			`percpu_counter_add(struct percpu_counter *fbc, s64 amount)`
104			`{`
105			`preempt_disable();`
106			`fbc->count += amount;`
107			`preempt_enable();`
108			`}`
109
110			`static inline s64 percpu_counter_read(struct percpu_counter *fbc)`
111			`{`
112			`return fbc->count;`
113			`}`
114
115			`static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)`
116			`{`
117			`return fbc->count;`
118			`}`
119
120			`static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)`
121			`{`
122			`return percpu_counter_read_positive(fbc);`
123			`}`
124
125			`static inline s64 percpu_counter_sum(struct percpu_counter *fbc)`
126			`{`
127			`return percpu_counter_read(fbc);`
128			`}`
129
130			`#endif /* CONFIG_SMP */`
131
132			`static inline void percpu_counter_inc(struct percpu_counter *fbc)`
133			`{`
134			`percpu_counter_add(fbc, 1);`
135			`}`
136
137			`static inline void percpu_counter_dec(struct percpu_counter *fbc)`
138			`{`
139			`percpu_counter_add(fbc, -1);`
140			`}`
141
142			`static inline void percpu_counter_sub(struct percpu_counter *fbc, s64 amount)`
143			`{`
144			`percpu_counter_add(fbc, -amount);`
145			`}`
146
147			`#endif /* _LINUX_PERCPU_COUNTER_H */`

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[/] [test_project/] [trunk/] [linux_sd_driver/] [include/] [linux/] [percpu_counter.h] - Blame information for rev 81