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