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sched.7: Add a new introductory paragraph describing the nice value 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2016-11-27 19:22:05 +01:00
parent 40f0931ccb
commit d145138ee0
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@ -380,6 +380,19 @@ but denied to run by the scheduler.
This ensures fair progress among all \fBSCHED_OTHER\fP threads.
.\"
.SS The nice value
The nice value is a per-process attribute
that can be used to influence the CPU scheduler to
favor or disfavor a process in scheduling decisions.
It affects the scheduling of
.BR SCHED_OTHER
and
.BR SCHED_BATCH
(see below)
processes.
According to POSIX.1, the threads in a process should share a nice value.
However, on Linux, the nice value is a per-thread attribute:
different threads in the same process may have different nice values.
The range of the nice value
varies across UNIX systems.
On modern Linux, the range is \-20 (high priority) to +19 (low priority).