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[/] [test_project/] [trunk/] [linux_sd_driver/] [include/] [linux/] [proportions.h] - Blame information for rev 62

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/*
 * FLoating proportions
 *
 *  Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
 *
 * This file contains the public data structure and API definitions.
 */
 
#ifndef _LINUX_PROPORTIONS_H
#define _LINUX_PROPORTIONS_H
 
#include <linux/percpu_counter.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
 
struct prop_global {
        /*
         * The period over which we differentiate
         *
         *   period = 2^shift
         */
        int shift;
        /*
         * The total event counter aka 'time'.
         *
         * Treated as an unsigned long; the lower 'shift - 1' bits are the
         * counter bits, the remaining upper bits the period counter.
         */
        struct percpu_counter events;
};
 
/*
 * global proportion descriptor
 *
 * this is needed to consitently flip prop_global structures.
 */
struct prop_descriptor {
        int index;
        struct prop_global pg[2];
        struct mutex mutex;             /* serialize the prop_global switch */
};
 
int prop_descriptor_init(struct prop_descriptor *pd, int shift);
void prop_change_shift(struct prop_descriptor *pd, int new_shift);
 
/*
 * ----- PERCPU ------
 */
 
struct prop_local_percpu {
        /*
         * the local events counter
         */
        struct percpu_counter events;
 
        /*
         * snapshot of the last seen global state
         */
        int shift;
        unsigned long period;
        spinlock_t lock;                /* protect the snapshot state */
};
 
int prop_local_init_percpu(struct prop_local_percpu *pl);
void prop_local_destroy_percpu(struct prop_local_percpu *pl);
void __prop_inc_percpu(struct prop_descriptor *pd, struct prop_local_percpu *pl);
void prop_fraction_percpu(struct prop_descriptor *pd, struct prop_local_percpu *pl,
                long *numerator, long *denominator);
 
static inline
void prop_inc_percpu(struct prop_descriptor *pd, struct prop_local_percpu *pl)
{
        unsigned long flags;
 
        local_irq_save(flags);
        __prop_inc_percpu(pd, pl);
        local_irq_restore(flags);
}
 
/*
 * ----- SINGLE ------
 */
 
struct prop_local_single {
        /*
         * the local events counter
         */
        unsigned long events;
 
        /*
         * snapshot of the last seen global state
         * and a lock protecting this state
         */
        int shift;
        unsigned long period;
        spinlock_t lock;                /* protect the snapshot state */
};
 
#define INIT_PROP_LOCAL_SINGLE(name)                    \
{       .lock = __SPIN_LOCK_UNLOCKED(name.lock),        \
}
 
int prop_local_init_single(struct prop_local_single *pl);
void prop_local_destroy_single(struct prop_local_single *pl);
void __prop_inc_single(struct prop_descriptor *pd, struct prop_local_single *pl);
void prop_fraction_single(struct prop_descriptor *pd, struct prop_local_single *pl,
                long *numerator, long *denominator);
 
static inline
void prop_inc_single(struct prop_descriptor *pd, struct prop_local_single *pl)
{
        unsigned long flags;
 
        local_irq_save(flags);
        __prop_inc_single(pd, pl);
        local_irq_restore(flags);
}
 
#endif /* _LINUX_PROPORTIONS_H */

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
2			`* FLoating proportions`
3			`*`
4			`* Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>`
5			`*`
6			`* This file contains the public data structure and API definitions.`
7			`*/`
8
9			`#ifndef _LINUX_PROPORTIONS_H`
10			`#define _LINUX_PROPORTIONS_H`
11
12			`#include <linux/percpu_counter.h>`
13			`#include <linux/spinlock.h>`
14			`#include <linux/mutex.h>`
15
16			`struct prop_global {`
17			`/*`
18			`* The period over which we differentiate`
19			`*`
20			`* period = 2^shift`
21			`*/`
22			`int shift;`
23			`/*`
24			`* The total event counter aka 'time'.`
25			`*`
26			`* Treated as an unsigned long; the lower 'shift - 1' bits are the`
27			`* counter bits, the remaining upper bits the period counter.`
28			`*/`
29			`struct percpu_counter events;`
30			`};`
31
32			`/*`
33			`* global proportion descriptor`
34			`*`
35			`* this is needed to consitently flip prop_global structures.`
36			`*/`
37			`struct prop_descriptor {`
38			`int index;`
39			`struct prop_global pg[2];`
40			`struct mutex mutex; /* serialize the prop_global switch */`
41			`};`
42
43			`int prop_descriptor_init(struct prop_descriptor *pd, int shift);`
44			`void prop_change_shift(struct prop_descriptor *pd, int new_shift);`
45
46			`/*`
47			`* ----- PERCPU ------`
48			`*/`
49
50			`struct prop_local_percpu {`
51			`/*`
52			`* the local events counter`
53			`*/`
54			`struct percpu_counter events;`
55
56			`/*`
57			`* snapshot of the last seen global state`
58			`*/`
59			`int shift;`
60			`unsigned long period;`
61			`spinlock_t lock; /* protect the snapshot state */`
62			`};`
63
64			`int prop_local_init_percpu(struct prop_local_percpu *pl);`
65			`void prop_local_destroy_percpu(struct prop_local_percpu *pl);`
66			`void __prop_inc_percpu(struct prop_descriptor pd, struct prop_local_percpu pl);`
67			`void prop_fraction_percpu(struct prop_descriptor pd, struct prop_local_percpu pl,`
68			`long numerator, long denominator);`
69
70			`static inline`
71			`void prop_inc_percpu(struct prop_descriptor pd, struct prop_local_percpu pl)`
72			`{`
73			`unsigned long flags;`
74
75			`local_irq_save(flags);`
76			`__prop_inc_percpu(pd, pl);`
77			`local_irq_restore(flags);`
78			`}`
79
80			`/*`
81			`* ----- SINGLE ------`
82			`*/`
83
84			`struct prop_local_single {`
85			`/*`
86			`* the local events counter`
87			`*/`
88			`unsigned long events;`
89
90			`/*`
91			`* snapshot of the last seen global state`
92			`* and a lock protecting this state`
93			`*/`
94			`int shift;`
95			`unsigned long period;`
96			`spinlock_t lock; /* protect the snapshot state */`
97			`};`
98
99			`#define INIT_PROP_LOCAL_SINGLE(name) \`
100			`{ .lock = __SPIN_LOCK_UNLOCKED(name.lock), \`
101			`}`
102
103			`int prop_local_init_single(struct prop_local_single *pl);`
104			`void prop_local_destroy_single(struct prop_local_single *pl);`
105			`void __prop_inc_single(struct prop_descriptor pd, struct prop_local_single pl);`
106			`void prop_fraction_single(struct prop_descriptor pd, struct prop_local_single pl,`
107			`long numerator, long denominator);`
108
109			`static inline`
110			`void prop_inc_single(struct prop_descriptor pd, struct prop_local_single pl)`
111			`{`
112			`unsigned long flags;`
113
114			`local_irq_save(flags);`
115			`__prop_inc_single(pd, pl);`
116			`local_irq_restore(flags);`
117			`}`
118
119			`#endif /* _LINUX_PROPORTIONS_H */`

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[/] [test_project/] [trunk/] [linux_sd_driver/] [include/] [linux/] [proportions.h] - Blame information for rev 62