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/* SPDX-License-Identifier: GPL-2.0 */
/*
* 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_
#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_tsk_latency_tracing(struct task_struct *p);
int sysctl_latencytop(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
#else
static inline void
account_scheduler_latency(struct task_struct *task, int usecs, int inter)
{
}
static inline void clear_tsk_latency_tracing(struct task_struct *p)
{
}
#endif
#endif