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sched.7: Minor rewording of discussion of nice value 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2016-11-28 07:06:59 +01:00
parent 31046c3cbd
commit bcbb240cf4
1 changed files with 7 additions and 6 deletions
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@ -388,24 +388,25 @@ but denied to run by the scheduler.
This ensures fair progress among all \fBSCHED_OTHER\fP threads. This ensures fair progress among all \fBSCHED_OTHER\fP threads.
.\" .\"
.SS The nice value .SS The nice value
The nice value is a per-process attribute The nice value is an attribute
that can be used to influence the CPU scheduler to that can be used to influence the CPU scheduler to
favor or disfavor a process in scheduling decisions. favor or disfavor a process in scheduling decisions.
It affects the scheduling of It affects the scheduling of
.BR SCHED_OTHER .BR SCHED_OTHER
and and
.BR SCHED_BATCH .BR SCHED_BATCH
(see below) (see below) processes.
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 nice value can be modified using The nice value can be modified using
.BR nice (2), .BR nice (2),
.BR setpriority (2), .BR setpriority (2),
or or
.BR sched_setattr (2). .BR sched_setattr (2).
According to POSIX.1, the nice value is a per-process attribute;
that is, 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 The range of the nice value
varies across UNIX systems. varies across UNIX systems.
On modern Linux, the range is \-20 (high priority) to +19 (low priority). On modern Linux, the range is \-20 (high priority) to +19 (low priority).