| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _LINUX_SCHED_PRIO_H |
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| 3 | #define _LINUX_SCHED_PRIO_H |
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| 4 | |
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| 5 | #define MAX_NICE 19 |
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| 6 | #define MIN_NICE -20 |
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| 7 | #define NICE_WIDTH (MAX_NICE - MIN_NICE + 1) |
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| 8 | |
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| 9 | /* |
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| 10 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT |
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| 11 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH |
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| 12 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority |
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| 13 | * values are inverted: lower p->prio value means higher priority. |
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| 14 | */ |
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| 15 | |
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| 16 | #define MAX_RT_PRIO 100 |
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| 17 | |
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| 18 | #define MAX_PRIO (MAX_RT_PRIO + NICE_WIDTH) |
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| 19 | #define DEFAULT_PRIO (MAX_RT_PRIO + NICE_WIDTH / 2) |
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| 20 | |
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| 21 | /* |
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| 22 | * Convert user-nice values [ -20 ... 0 ... 19 ] |
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| 23 | * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ], |
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| 24 | * and back. |
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| 25 | */ |
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| 26 | #define NICE_TO_PRIO(nice) ((nice) + DEFAULT_PRIO) |
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| 27 | #define PRIO_TO_NICE(prio) ((prio) - DEFAULT_PRIO) |
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| 28 | |
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| 29 | /* |
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| 30 | * Convert nice value [19,-20] to rlimit style value [1,40]. |
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| 31 | */ |
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| 32 | static inline long nice_to_rlimit(long nice) |
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| 33 | { |
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| 34 | return (MAX_NICE - nice + 1); |
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| 35 | } |
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| 36 | |
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| 37 | /* |
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| 38 | * Convert rlimit style value [1,40] to nice value [-20, 19]. |
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| 39 | */ |
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| 40 | static inline long rlimit_to_nice(long prio) |
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| 41 | { |
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| 42 | return (MAX_NICE - prio + 1); |
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| 43 | } |
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| 44 | |
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| 45 | #endif /* _LINUX_SCHED_PRIO_H */ |
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| 46 | |
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