72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SCHED_PRIO_H
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#define _LINUX_SCHED_PRIO_H
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#define MAX_NICE 19
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#define MIN_NICE -20
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#define NICE_WIDTH (MAX_NICE - MIN_NICE + 1)
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/*
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* Priority of a process goes from 0..MAX_PRIO-1, valid RT
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* priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
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* tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
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* values are inverted: lower p->prio value means higher priority.
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*/
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#define MAX_RT_PRIO 100
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#define MAX_PRIO (MAX_RT_PRIO + NICE_WIDTH)
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#define DEFAULT_PRIO (MAX_RT_PRIO + NICE_WIDTH / 2)
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#ifdef CONFIG_SCHED_ALT
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/* Undefine MAX_PRIO and DEFAULT_PRIO */
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#undef MAX_PRIO
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#undef DEFAULT_PRIO
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/* +/- priority levels from the base priority */
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#ifdef CONFIG_SCHED_BMQ
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#define MAX_PRIORITY_ADJ (7)
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#define MIN_NORMAL_PRIO (MAX_RT_PRIO)
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#define MAX_PRIO (MIN_NORMAL_PRIO + NICE_WIDTH)
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#define DEFAULT_PRIO (MIN_NORMAL_PRIO + NICE_WIDTH / 2)
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#endif
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#ifdef CONFIG_SCHED_PDS
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#define MAX_PRIORITY_ADJ (0)
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#define MIN_NORMAL_PRIO (128)
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#define NORMAL_PRIO_NUM (64)
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#define MAX_PRIO (MIN_NORMAL_PRIO + NORMAL_PRIO_NUM)
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#define DEFAULT_PRIO (MAX_PRIO - NICE_WIDTH / 2)
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#endif
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#endif /* CONFIG_SCHED_ALT */
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/*
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* Convert user-nice values [ -20 ... 0 ... 19 ]
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* to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
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* and back.
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*/
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#define NICE_TO_PRIO(nice) ((nice) + DEFAULT_PRIO)
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#define PRIO_TO_NICE(prio) ((prio) - DEFAULT_PRIO)
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/*
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* Convert nice value [19,-20] to rlimit style value [1,40].
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*/
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static inline long nice_to_rlimit(long nice)
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{
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return (MAX_NICE - nice + 1);
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}
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/*
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* Convert rlimit style value [1,40] to nice value [-20, 19].
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*/
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static inline long rlimit_to_nice(long prio)
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{
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return (MAX_NICE - prio + 1);
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}
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#endif /* _LINUX_SCHED_PRIO_H */
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