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The only remaining use of MAX_USER_PRIO (and USER_PRIO) is the SCALE_PRIO() definition in the PowerPC Cell architecture's Synergistic Processor Unit (SPU) scheduler. TASK_USER_PRIO isn't used anymore. Commitfe443ef2ac("[POWERPC] spusched: Dynamic timeslicing for SCHED_OTHER") copied SCALE_PRIO() from the task scheduler in v2.6.23. Commita4ec24b48d("sched: tidy up SCHED_RR") removed it from the task scheduler in v2.6.24. Commit3ee237dddc("sched/prio: Add 3 macros of MAX_NICE, MIN_NICE and NICE_WIDTH in prio.h") introduced NICE_WIDTH much later. With: MAX_USER_PRIO = USER_PRIO(MAX_PRIO) = MAX_PRIO - MAX_RT_PRIO MAX_PRIO = MAX_RT_PRIO + NICE_WIDTH MAX_USER_PRIO = MAX_RT_PRIO + NICE_WIDTH - MAX_RT_PRIO MAX_USER_PRIO = NICE_WIDTH MAX_USER_PRIO can be replaced by NICE_WIDTH to be able to remove all the {*_}USER_PRIO defines. Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lkml.kernel.org/r/20210128131040.296856-3-dietmar.eggemann@arm.com
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/* 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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/*
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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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