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sched/core: Update task_prio() function header

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The description of the RT offset and the values for 'normal' tasks needs
update. Moreover there are DL tasks now.
task_prio() has to stay like it is to guarantee compatibility with the
/proc/<pid>/stat priority field:

  # cat /proc/<pid>/stat | awk '{ print $18; }'

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/20210128131040.296856-4-dietmar.eggemann@arm.com
This commit is contained in:
Dietmar Eggemann 2021-01-28 14:10:40 +01:00 committed by Ingo Molnar
parent 9d061ba6bc
commit c541bb7835
1 changed files with 6 additions and 2 deletions
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8
kernel/sched/core.c
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@ -5616,8 +5616,12 @@ SYSCALL_DEFINE1(nice, int, increment)
* @p: the task in question.
*
* Return: The priority value as seen by users in /proc.
* RT tasks are offset by -200. Normal tasks are centered
* around 0, value goes from -16 to +15.
*
* sched policy return value kernel prio user prio/nice
*
* normal, batch, idle [0 ... 39] [100 ... 139] 0/[-20 ... 19]
* fifo, rr [-2 ... -100] [98 ... 0] [1 ... 99]
* deadline -101 -1 0
*/
int task_prio(const struct task_struct *p)
{