| /* 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 */ |