Eric Lee / smarc-fsl-linux-kernel

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include/linux/average.h 653 Bytes
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c5485a7e7   Bruno Randolf   lib: Add generic ... 
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  #ifndef _LINUX_AVERAGE_H
  #define _LINUX_AVERAGE_H
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  /* Exponentially weighted moving average (EWMA) */
  
  /* For more documentation see lib/average.c */
  
  struct ewma {
  	unsigned long internal;
  	unsigned long factor;
  	unsigned long weight;
  };
  
  extern void ewma_init(struct ewma *avg, unsigned long factor,
  		      unsigned long weight);
  
  extern struct ewma *ewma_add(struct ewma *avg, unsigned long val);
  
  /**
   * ewma_read() - Get average value
   * @avg: Average structure
   *
   * Returns the average value held in @avg.
   */
  static inline unsigned long ewma_read(const struct ewma *avg)
  {
af5568843   Bruno Randolf   lib: Improve EWMA... 
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  	return avg->internal >> avg->factor;
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  }
  
  #endif /* _LINUX_AVERAGE_H */