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include/linux/latencytop.h 1.02 KB
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9745512ce   Arjan van de Ven   sched: latencytop... 
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  /*
   * latencytop.h: Infrastructure for displaying latency
   *
   * (C) Copyright 2008 Intel Corporation
   * Author: Arjan van de Ven <arjan@linux.intel.com>
   *
   */
  
  #ifndef _INCLUDE_GUARD_LATENCYTOP_H_
  #define _INCLUDE_GUARD_LATENCYTOP_H_
ad0b0fd55   Arjan van de Ven   sched, latencytop... 
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  #include <linux/compiler.h>
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  #ifdef CONFIG_LATENCYTOP
  
  #define LT_SAVECOUNT		32
  #define LT_BACKTRACEDEPTH	12
  
  struct latency_record {
  	unsigned long	backtrace[LT_BACKTRACEDEPTH];
  	unsigned int	count;
  	unsigned long	time;
  	unsigned long	max;
  };
  
  
  struct task_struct;
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  extern int latencytop_enabled;
  void __account_scheduler_latency(struct task_struct *task, int usecs, int inter);
  static inline void
  account_scheduler_latency(struct task_struct *task, int usecs, int inter)
  {
  	if (unlikely(latencytop_enabled))
  		__account_scheduler_latency(task, usecs, inter);
  }
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  void clear_all_latency_tracing(struct task_struct *p);
  
  #else
  
  static inline void
  account_scheduler_latency(struct task_struct *task, int usecs, int inter)
  {
  }
  
  static inline void clear_all_latency_tracing(struct task_struct *p)
  {
  }
  
  #endif
  
  #endif