latencytop.h

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/*
 * latencytop.h: Infrastructure for displaying latency
 *
 * (C) Copyright 2008 Intel Corporation
 * Author: Arjan van de Ven <[email protected]>
 *
 */

#ifndef _INCLUDE_GUARD_LATENCYTOP_H_
#define _INCLUDE_GUARD_LATENCYTOP_H_

#include <linux/compiler.h>
struct task_struct;

#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;
};



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);
}

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