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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 {
int shift;
struct percpu_counter events;
};
struct prop_descriptor {
int index;
struct prop_global pg[2];
struct mutex mutex;
};
int prop_descriptor_init(struct prop_descriptor *pd, int shift);
void prop_change_shift(struct prop_descriptor *pd, int new_shift);
struct prop_local_percpu {
struct percpu_counter events;
int shift;
unsigned long period;
raw_spinlock_t lock;
};
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);
}
#if BITS_PER_LONG == 32
#define PROP_MAX_SHIFT (3*BITS_PER_LONG/4)
#else
#define PROP_MAX_SHIFT (BITS_PER_LONG/2)
#endif
#define PROP_FRAC_SHIFT (BITS_PER_LONG - PROP_MAX_SHIFT - 1)
#define PROP_FRAC_BASE (1UL << PROP_FRAC_SHIFT)
void __prop_inc_percpu_max(struct prop_descriptor *pd,
struct prop_local_percpu *pl, long frac);
struct prop_local_single {
unsigned long events;
unsigned long period;
int shift;
raw_spinlock_t lock;
};
#define INIT_PROP_LOCAL_SINGLE(name) \
{ .lock = __RAW_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
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