include/linux/latencytop.h

   1 /*
   2  * latencytop.h: Infrastructure for displaying latency
   3  *
   4  * (C) Copyright 2008 Intel Corporation
   5  * Author: Arjan van de Ven <arjan@linux.intel.com>
   6  *
   7  */
   8
   9 #ifndef _INCLUDE_GUARD_LATENCYTOP_H_
  10 #define _INCLUDE_GUARD_LATENCYTOP_H_
  11
  12 #ifdef CONFIG_LATENCYTOP
  13
  14 #define LT_SAVECOUNT            32
  15 #define LT_BACKTRACEDEPTH       12
  16
  17 struct latency_record {
  18         unsigned long   backtrace[LT_BACKTRACEDEPTH];
  19         unsigned int    count;
  20         unsigned long   time;
  21         unsigned long   max;
  22 };
  23
  24
  25 struct task_struct;
  26
  27 void account_scheduler_latency(struct task_struct *task, int usecs, int inter);
  28
  29 void clear_all_latency_tracing(struct task_struct *p);
  30
  31 #else
  32
  33 static inline void
  34 account_scheduler_latency(struct task_struct *task, int usecs, int inter)
  35 {
  36 }
  37
  38 static inline void clear_all_latency_tracing(struct task_struct *p)
  39 {
  40 }
  41
  42 #endif
  43
  44 #endif