linux/include/linux/latencytop.h
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   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#include <linux/compiler.h>
  13struct task_struct;
  14
  15#ifdef CONFIG_LATENCYTOP
  16
  17#define LT_SAVECOUNT            32
  18#define LT_BACKTRACEDEPTH       12
  19
  20struct latency_record {
  21        unsigned long   backtrace[LT_BACKTRACEDEPTH];
  22        unsigned int    count;
  23        unsigned long   time;
  24        unsigned long   max;
  25};
  26
  27
  28
  29extern int latencytop_enabled;
  30void __account_scheduler_latency(struct task_struct *task, int usecs, int inter);
  31static inline void
  32account_scheduler_latency(struct task_struct *task, int usecs, int inter)
  33{
  34        if (unlikely(latencytop_enabled))
  35                __account_scheduler_latency(task, usecs, inter);
  36}
  37
  38void clear_all_latency_tracing(struct task_struct *p);
  39
  40#else
  41
  42static inline void
  43account_scheduler_latency(struct task_struct *task, int usecs, int inter)
  44{
  45}
  46
  47static inline void clear_all_latency_tracing(struct task_struct *p)
  48{
  49}
  50
  51#endif
  52
  53#endif
  54
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