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sys_macosx: add option to run chronyd as real-time process

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Adds option -P to chronyd on MacOS X which can be used to enable the
thread time constraint scheduling policy. This near real-time scheduling
policy removes a 1usec bias from the 'System time' offset.
This commit is contained in:
Bryan Christianson
2015-08-25 08:32:14 +12:00
committed by Miroslav Lichvar
parent 5039f959e0
commit b9cfdaf666
5 changed files with 78 additions and 13 deletions
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8
chronyd.8.in
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@@ -40,9 +40,11 @@ A summary of the options supported by \fBchronyd\fR is included below.
.TP
\fB\-P\fR \fIpriority\fR
This option will select the SCHED_FIFO real-time scheduler at the specified
priority (which must be between 0 and 100). This mode is supported only on
Linux.
On Linux, this option will select the SCHED_FIFO real-time scheduler at the
specified priority (which must be between 0 and 100). On Mac OS X, this
option must have either a value of 0 (the default) to disable the thread
time constraint policy or 1 for the policy to be enabled. Other systems do not
support this option.
.TP
.B \-m
This option will lock chronyd into RAM so that it will never be paged out.