LCOV - code coverage report
Current view: top level - include/linux/sched - prio.h (source / functions) Hit Total Coverage
Test: gcov_data_raspi2_real_modules_combined.info Lines: 1 1 100.0 %
Date: 2020-09-30 20:25:40 Functions: 0 0 -
Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: GPL-2.0 */
       2                 :            : #ifndef _LINUX_SCHED_PRIO_H
       3                 :            : #define _LINUX_SCHED_PRIO_H
       4                 :            : 
       5                 :            : #define MAX_NICE        19
       6                 :            : #define MIN_NICE        -20
       7                 :            : #define NICE_WIDTH      (MAX_NICE - MIN_NICE + 1)
       8                 :            : 
       9                 :            : /*
      10                 :            :  * Priority of a process goes from 0..MAX_PRIO-1, valid RT
      11                 :            :  * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
      12                 :            :  * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
      13                 :            :  * values are inverted: lower p->prio value means higher priority.
      14                 :            :  *
      15                 :            :  * The MAX_USER_RT_PRIO value allows the actual maximum
      16                 :            :  * RT priority to be separate from the value exported to
      17                 :            :  * user-space.  This allows kernel threads to set their
      18                 :            :  * priority to a value higher than any user task. Note:
      19                 :            :  * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
      20                 :            :  */
      21                 :            : 
      22                 :            : #define MAX_USER_RT_PRIO        100
      23                 :            : #define MAX_RT_PRIO             MAX_USER_RT_PRIO
      24                 :            : 
      25                 :            : #define MAX_PRIO                (MAX_RT_PRIO + NICE_WIDTH)
      26                 :            : #define DEFAULT_PRIO            (MAX_RT_PRIO + NICE_WIDTH / 2)
      27                 :            : 
      28                 :            : /*
      29                 :            :  * Convert user-nice values [ -20 ... 0 ... 19 ]
      30                 :            :  * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
      31                 :            :  * and back.
      32                 :            :  */
      33                 :            : #define NICE_TO_PRIO(nice)      ((nice) + DEFAULT_PRIO)
      34                 :            : #define PRIO_TO_NICE(prio)      ((prio) - DEFAULT_PRIO)
      35                 :            : 
      36                 :            : /*
      37                 :            :  * 'User priority' is the nice value converted to something we
      38                 :            :  * can work with better when scaling various scheduler parameters,
      39                 :            :  * it's a [ 0 ... 39 ] range.
      40                 :            :  */
      41                 :            : #define USER_PRIO(p)            ((p)-MAX_RT_PRIO)
      42                 :            : #define TASK_USER_PRIO(p)       USER_PRIO((p)->static_prio)
      43                 :            : #define MAX_USER_PRIO           (USER_PRIO(MAX_PRIO))
      44                 :            : 
      45                 :            : /*
      46                 :            :  * Convert nice value [19,-20] to rlimit style value [1,40].
      47                 :            :  */
      48                 :            : static inline long nice_to_rlimit(long nice)
      49                 :            : {
      50                 :       1662 :         return (MAX_NICE - nice + 1);
      51                 :            : }
      52                 :            : 
      53                 :            : /*
      54                 :            :  * Convert rlimit style value [1,40] to nice value [-20, 19].
      55                 :            :  */
      56                 :            : static inline long rlimit_to_nice(long prio)
      57                 :            : {
      58                 :            :         return (MAX_NICE - prio + 1);
      59                 :            : }
      60                 :            : 
      61                 :            : #endif /* _LINUX_SCHED_PRIO_H */

Generated by: LCOV version 1.14