Cregit: Linux 6.13: prio.h

Contributors: 8
Author	Tokens	Token Proportion	Commits	Commit Proportion
Dongsheng Yang	62	65.96%	4	33.33%
Ingo Molnar	15	15.96%	2	16.67%
Linus Torvalds	6	6.38%	1	8.33%
Dario Faggioli	4	4.26%	1	8.33%
Clark Williams	3	3.19%	1	8.33%
Dietmar Eggemann	2	2.13%	1	8.33%
Greg Kroah-Hartman	1	1.06%	1	8.33%
Robert Love	1	1.06%	1	8.33%
Total	94		12

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SCHED_PRIO_H
#define _LINUX_SCHED_PRIO_H

#define MAX_NICE	19
#define MIN_NICE	-20
#define NICE_WIDTH	(MAX_NICE - MIN_NICE + 1)

/*
 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
 * values are inverted: lower p->prio value means higher priority.
 */

#define MAX_RT_PRIO		100
#define MAX_DL_PRIO		0

#define MAX_PRIO		(MAX_RT_PRIO + NICE_WIDTH)
#define DEFAULT_PRIO		(MAX_RT_PRIO + NICE_WIDTH / 2)

/*
 * Convert user-nice values [ -20 ... 0 ... 19 ]
 * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
 * and back.
 */
#define NICE_TO_PRIO(nice)	((nice) + DEFAULT_PRIO)
#define PRIO_TO_NICE(prio)	((prio) - DEFAULT_PRIO)

/*
 * Convert nice value [19,-20] to rlimit style value [1,40].
 */
static inline long nice_to_rlimit(long nice)
{
	return (MAX_NICE - nice + 1);
}

/*
 * Convert rlimit style value [1,40] to nice value [-20, 19].
 */
static inline long rlimit_to_nice(long prio)
{
	return (MAX_NICE - prio + 1);
}

#endif /* _LINUX_SCHED_PRIO_H */