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/* 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. * * The MAX_USER_RT_PRIO value allows the actual maximum * RT priority to be separate from the value exported to * user-space. This allows kernel threads to set their * priority to a value higher than any user task. Note: * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. */ #define MAX_USER_RT_PRIO 100 #define MAX_RT_PRIO MAX_USER_RT_PRIO #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) /* * 'User priority' is the nice value converted to something we * can work with better when scaling various scheduler parameters, * it's a [ 0 ... 39 ] range. */ #define USER_PRIO(p) ((p)-MAX_RT_PRIO) #define TASK_USER_PRIO(p) USER_PRIO((p)->static_prio) #define MAX_USER_PRIO (USER_PRIO(MAX_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 */
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