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include/linux/flex_proportions.h 2.81 KB
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b24413180   Greg Kroah-Hartman   License cleanup: ... 
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  /* SPDX-License-Identifier: GPL-2.0 */
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  /*
   * 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>
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  #include <linux/gfp.h>
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  /*
   * 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;
  };
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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);
  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);
  }
  
  /*
   * ---- 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 */
  };
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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);
  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);
  }
  
  #endif