prio.h File Reference

Defines processes priority value. More...

Go to the source code of this file.

Macros
#define	MAX_NICE   +19
	Max niceness value.
#define	MIN_NICE   -20
	Min niceness value.
#define	NICE_WIDTH   (MAX_NICE - MIN_NICE + 1)
	Niceness range.
#define	MAX_RT_PRIO   100
	Maximum real-time priority.
#define	MAX_PRIO   (MAX_RT_PRIO + NICE_WIDTH)
	Maximum priority.
#define	DEFAULT_PRIO   (MAX_RT_PRIO + NICE_WIDTH / 2)
	Default priority.
#define	NICE_TO_PRIO(nice)   ((nice) + DEFAULT_PRIO)
	Converts user-nice values [ -20 ... 0 ... 19 ] to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ].
#define	PRIO_TO_NICE(prio)   ((prio)-DEFAULT_PRIO)
	Converts static priority [ MAX_RT_PRIO..MAX_PRIO-1 ] to user-nice values [ -20 ... 0 ... 19 ].
#define	USER_PRIO(p)   ((p)-MAX_RT_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	TASK_USER_PRIO(p)   USER_PRIO((p)->static_prio)
	Provide easy access to the priority value of a task_struct.
#define	MAX_USER_PRIO   (USER_PRIO(MAX_PRIO))
	The maximum priority for a user process.
#define	GET_WEIGHT(prio)   prio_to_weight[USER_PRIO((prio))]
	Transforms the priority to weight.
#define	NICE_0_LOAD   GET_WEIGHT(DEFAULT_PRIO)
	Weight of a default priority.

Variables
static const int	prio_to_weight [NICE_WIDTH]
	Table that transforms the priority into a weight, used for computing the virtual runtime. More...

Detailed Description

Defines processes priority value.

Copyright

(c) 2014-2024 This file is distributed under the MIT License. See LICENSE.md for details.

Variable Documentation

prio_to_weight

const int prio_to_weight[NICE_WIDTH]

static

Initial value:

= {
     88761, 71755, 56483, 46273, 36291,
     29154, 23254, 18705, 14949, 11916,
     9548, 7620, 6100, 4904, 3906,
     3121, 2501, 1991, 1586, 1277,
     1024, 820, 655, 526, 423,
     335, 272, 215, 172, 137,
     110, 87, 70, 56, 45,
     36, 29, 23, 18, 15
}

Table that transforms the priority into a weight, used for computing the virtual runtime.