| /* 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_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 */ |
