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103 lines
2.8 KiB
103 lines
2.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Floating proportions with flexible aging period |
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* |
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* Copyright (C) 2011, SUSE, Jan Kara <[email protected]> |
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*/ |
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#ifndef _LINUX_FLEX_PROPORTIONS_H |
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#define _LINUX_FLEX_PROPORTIONS_H |
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#include <linux/percpu_counter.h> |
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#include <linux/spinlock.h> |
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#include <linux/seqlock.h> |
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#include <linux/gfp.h> |
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/* |
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* When maximum proportion of some event type is specified, this is the |
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* precision with which we allow limitting. Note that this creates an upper |
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* bound on the number of events per period like |
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* ULLONG_MAX >> FPROP_FRAC_SHIFT. |
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*/ |
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#define FPROP_FRAC_SHIFT 10 |
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#define FPROP_FRAC_BASE (1UL << FPROP_FRAC_SHIFT) |
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/* |
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* ---- Global proportion definitions ---- |
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*/ |
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struct fprop_global { |
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/* Number of events in the current period */ |
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struct percpu_counter events; |
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/* Current period */ |
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unsigned int period; |
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/* Synchronization with period transitions */ |
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seqcount_t sequence; |
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}; |
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int fprop_global_init(struct fprop_global *p, gfp_t gfp); |
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void fprop_global_destroy(struct fprop_global *p); |
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bool fprop_new_period(struct fprop_global *p, int periods); |
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/* |
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* ---- SINGLE ---- |
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*/ |
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struct fprop_local_single { |
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/* the local events counter */ |
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unsigned long events; |
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/* Period in which we last updated events */ |
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unsigned int period; |
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raw_spinlock_t lock; /* Protect period and numerator */ |
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}; |
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#define INIT_FPROP_LOCAL_SINGLE(name) \ |
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{ .lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \ |
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} |
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int fprop_local_init_single(struct fprop_local_single *pl); |
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void fprop_local_destroy_single(struct fprop_local_single *pl); |
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void __fprop_inc_single(struct fprop_global *p, struct fprop_local_single *pl); |
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void fprop_fraction_single(struct fprop_global *p, |
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struct fprop_local_single *pl, unsigned long *numerator, |
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unsigned long *denominator); |
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static inline |
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void fprop_inc_single(struct fprop_global *p, struct fprop_local_single *pl) |
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{ |
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unsigned long flags; |
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local_irq_save(flags); |
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__fprop_inc_single(p, pl); |
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local_irq_restore(flags); |
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} |
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/* |
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* ---- PERCPU ---- |
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*/ |
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struct fprop_local_percpu { |
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/* the local events counter */ |
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struct percpu_counter events; |
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/* Period in which we last updated events */ |
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unsigned int period; |
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raw_spinlock_t lock; /* Protect period and numerator */ |
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}; |
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int fprop_local_init_percpu(struct fprop_local_percpu *pl, gfp_t gfp); |
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void fprop_local_destroy_percpu(struct fprop_local_percpu *pl); |
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void __fprop_inc_percpu(struct fprop_global *p, struct fprop_local_percpu *pl); |
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void __fprop_inc_percpu_max(struct fprop_global *p, struct fprop_local_percpu *pl, |
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int max_frac); |
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void fprop_fraction_percpu(struct fprop_global *p, |
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struct fprop_local_percpu *pl, unsigned long *numerator, |
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unsigned long *denominator); |
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static inline |
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void fprop_inc_percpu(struct fprop_global *p, struct fprop_local_percpu *pl) |
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{ |
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unsigned long flags; |
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local_irq_save(flags); |
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__fprop_inc_percpu(p, pl); |
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local_irq_restore(flags); |
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} |
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#endif
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