[linux-block.git] / include / linux / latencytop.h

/* 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);

#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
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	/*
	3	* latencytop.h: Infrastructure for displaying latency
	4	*
	5	* (C) Copyright 2008 Intel Corporation
	6	* Author: Arjan van de Ven <arjan@linux.intel.com>
	7	*
	8	*/
	9
	10	#ifndef _INCLUDE_GUARD_LATENCYTOP_H_
	11	#define _INCLUDE_GUARD_LATENCYTOP_H_
	12
	13	#include <linux/compiler.h>
	14	struct task_struct;
	15
	16	#ifdef CONFIG_LATENCYTOP
	17
	18	#define LT_SAVECOUNT 32
	19	#define LT_BACKTRACEDEPTH 12
	20
	21	struct latency_record {
	22	unsigned long backtrace[LT_BACKTRACEDEPTH];
	23	unsigned int count;
	24	unsigned long time;
	25	unsigned long max;
	26	};
	27
	28
	29
	30	extern int latencytop_enabled;
	31	void __account_scheduler_latency(struct task_struct *task, int usecs, int inter);
	32	static inline void
	33	account_scheduler_latency(struct task_struct *task, int usecs, int inter)
	34	{
	35	if (unlikely(latencytop_enabled))
	36	__account_scheduler_latency(task, usecs, inter);
	37	}
	38
	39	void clear_tsk_latency_tracing(struct task_struct *p);
	40
	41	#else
	42
	43	static inline void
	44	account_scheduler_latency(struct task_struct *task, int usecs, int inter)
	45	{
	46	}
	47
	48	static inline void clear_tsk_latency_tracing(struct task_struct *p)
	49	{
	50	}
	51
	52	#endif
	53
	54	#endif