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| author | Lennart Poettering <lennart@poettering.net> | 2016-06-23 01:45:45 +0200 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2016-06-23 01:45:45 +0200 |
| commit | f4170c671b863a211056972a469abd416086f22c (patch) | |
| tree | 3027ad12cc818fd542443b14ffa1cb051e89f264 /man/systemd.exec.xml | |
| parent | abd84d4d8304590a3944eee385edbebc8dc3bda1 (diff) | |
execute: add a new easy-to-use RestrictRealtime= option to units
It takes a boolean value. If true, access to SCHED_RR, SCHED_FIFO and
SCHED_DEADLINE is blocked, which my be used to lock up the system.
Diffstat (limited to 'man/systemd.exec.xml')
| -rw-r--r-- | man/systemd.exec.xml | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml index dbfc7692f7..ed02666daf 100644 --- a/man/systemd.exec.xml +++ b/man/systemd.exec.xml @@ -1413,6 +1413,19 @@ </para></listitem> </varlistentry> + <varlistentry> + <term><varname>RestrictRealtime=</varname></term> + + <listitem><para>Takes a boolean argument. If set, any attempts to enable realtime scheduling in a process of + the unit are refused. This restricts access to realtime task scheduling policies such as + <constant>SCHED_FIFO</constant>, <constant>SCHED_RR</constant> or <constant>SCHED_DEADLINE</constant>. See + <citerefentry><refentrytitle>sched</refentrytitle><manvolnum>7</manvolnum></citerefentry> for details about + these scheduling policies. Realtime scheduling policies may be used to monopolize CPU time for longer periods + of time, and may hence be used to lock up or otherwise trigger Denial-of-Service situations on the system. It + is hence recommended to restrict access to realtime scheduling to the few programs that actually require + them. Defaults to off.</para></listitem> + </varlistentry> + </variablelist> </refsect1> |