Release 4.12 include/linux/flex_proportions.h

/*
 * Floating proportions with flexible aging period
 *
 *  Copyright (C) 2011, SUSE, Jan Kara <jack@suse.cz>
 */

#ifndef _LINUX_FLEX_PROPORTIONS_H

#define _LINUX_FLEX_PROPORTIONS_H

#include <linux/percpu_counter.h>
#include <linux/spinlock.h>
#include <linux/seqlock.h>
#include <linux/gfp.h>

/*
 * When maximum proportion of some event type is specified, this is the
 * precision with which we allow limitting. Note that this creates an upper
 * bound on the number of events per period like
 *   ULLONG_MAX >> FPROP_FRAC_SHIFT.
 */

#define FPROP_FRAC_SHIFT 10

#define FPROP_FRAC_BASE (1UL << FPROP_FRAC_SHIFT)

/*
 * ---- Global proportion definitions ----
 */

struct fprop_global {
	/* Number of events in the current period */
	
struct percpu_counter events;
	/* Current period */
	
unsigned int period;
	/* Synchronization with period transitions */
	
seqcount_t sequence;
};

int fprop_global_init(struct fprop_global *p, gfp_t gfp);
void fprop_global_destroy(struct fprop_global *p);
bool fprop_new_period(struct fprop_global *p, int periods);

/*
 *  ---- SINGLE ----
 */

struct fprop_local_single {
	/* the local events counter */
	
unsigned long events;
	/* Period in which we last updated events */
	
unsigned int period;
	
raw_spinlock_t lock;	/* Protect period and numerator */
};


#define INIT_FPROP_LOCAL_SINGLE(name)			\
{       .lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock),    \
}

int fprop_local_init_single(struct fprop_local_single *pl);
void fprop_local_destroy_single(struct fprop_local_single *pl);
void __fprop_inc_single(struct fprop_global *p, struct fprop_local_single *pl);
void fprop_fraction_single(struct fprop_global *p,
	struct fprop_local_single *pl, unsigned long *numerator,
	unsigned long *denominator);


static inline

void fprop_inc_single(struct fprop_global *p, struct fprop_local_single *pl)
{
	unsigned long flags;

	local_irq_save(flags);
	__fprop_inc_single(p, pl);
	local_irq_restore(flags);
}

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/*
 * ---- PERCPU ----
 */

struct fprop_local_percpu {
	/* the local events counter */
	
struct percpu_counter events;
	/* Period in which we last updated events */
	
unsigned int period;
	
raw_spinlock_t lock;	/* Protect period and numerator */
};

int fprop_local_init_percpu(struct fprop_local_percpu *pl, gfp_t gfp);
void fprop_local_destroy_percpu(struct fprop_local_percpu *pl);
void __fprop_inc_percpu(struct fprop_global *p, struct fprop_local_percpu *pl);
void __fprop_inc_percpu_max(struct fprop_global *p, struct fprop_local_percpu *pl,
			    int max_frac);
void fprop_fraction_percpu(struct fprop_global *p,
	struct fprop_local_percpu *pl, unsigned long *numerator,
	unsigned long *denominator);


static inline

void fprop_inc_percpu(struct fprop_global *p, struct fprop_local_percpu *pl)
{
	unsigned long flags;

	local_irq_save(flags);
	__fprop_inc_percpu(p, pl);
	local_irq_restore(flags);
}

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#endif
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Tejun Heo
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Directory: include/linux

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