OOMD.CONF(5) oomd.conf OOMD.CONF(5)
NAME
oomd.conf, oomd.conf.d - Global systemd-oomd configuration files
SYNOPSIS
/etc/systemd/oomd.conf
/etc/systemd/oomd.conf.d/*.conf
/usr/lib/systemd/oomd.conf.d/*.conf
DESCRIPTION
These files configure the various parameters of the systemd(1)
userspace out-of-memory (OOM) killer, systemd-oomd.service(8). See
systemd.syntax(7) for a general description of the syntax.
CONFIGURATION DIRECTORIES AND PRECEDENCE
The default configuration is set during compilation, so configuration
is only needed when it is necessary to deviate from those defaults.
Initially, the main configuration file in /etc/systemd/ contains
commented out entries showing the defaults as a guide to the
administrator. Local overrides can be created by editing this file or
by creating drop-ins, as described below. Using drop-ins for local
configuration is recommended over modifications to the main
configuration file.
In addition to the "main" configuration file, drop-in configuration
snippets are read from /usr/lib/systemd/*.conf.d/,
/usr/local/lib/systemd/*.conf.d/, and /etc/systemd/*.conf.d/. Those
drop-ins have higher precedence and override the main configuration
file. Files in the *.conf.d/ configuration subdirectories are sorted by
their filename in lexicographic order, regardless of in which of the
subdirectories they reside. When multiple files specify the same
option, for options which accept just a single value, the entry in the
file sorted last takes precedence, and for options which accept a list
of values, entries are collected as they occur in the sorted files.
When packages need to customize the configuration, they can install
drop-ins under /usr/. Files in /etc/ are reserved for the local
administrator, who may use this logic to override the configuration
files installed by vendor packages. Drop-ins have to be used to
override package drop-ins, since the main configuration file has lower
precedence. It is recommended to prefix all filenames in those
subdirectories with a two-digit number and a dash, to simplify the
ordering of the files.
To disable a configuration file supplied by the vendor, the recommended
way is to place a symlink to /dev/null in the configuration directory
in /etc/, with the same filename as the vendor configuration file.
[OOM] SECTION OPTIONS
The following options are available in the [OOM] section:
SwapUsedLimit=
Sets the limit for memory and swap usage on the system before
systemd-oomd will take action. If the fraction of memory used and
the fraction of swap used on the system are both more than what is
defined here, systemd-oomd will act on eligible descendant control
groups with swap usage greater than 5% of total swap, starting from
the ones with the highest swap usage. Which control groups are
monitored and what action gets taken depends on what the unit has
configured for ManagedOOMSwap=. Takes a value specified in percent
(when suffixed with "%"), permille ("‰") or permyriad ("‱"),
between 0% and 100%, inclusive. Defaults to 90%.
DefaultMemoryPressureLimit=
Sets the limit for memory pressure on the unit's control group
before systemd-oomd will take action. A unit can override this
value with ManagedOOMMemoryPressureLimit=. The memory pressure for
this property represents the fraction of time in a 10 second window
in which all tasks in the control group were delayed. For each
monitored control group, if the memory pressure on that control
group exceeds the limit set for longer than the duration set by
DefaultMemoryPressureDurationSec=, systemd-oomd will act on
eligible descendant control groups, starting from the ones with the
most reclaim activity to the least reclaim activity. Which control
groups are monitored and what action gets taken depends on what the
unit has configured for ManagedOOMMemoryPressure=. Takes a fraction
specified in the same way as SwapUsedLimit= above. Defaults to 60%.
DefaultMemoryPressureDurationSec=
Sets the amount of time a unit's control group needs to have
exceeded memory pressure limits before systemd-oomd will take
action. Memory pressure limits are defined by
DefaultMemoryPressureLimit= and ManagedOOMMemoryPressureLimit=.
Must be set to 0, or at least 1 second. Defaults to 30 seconds when
unset or 0.
SEE ALSO
systemd(1), systemd.resource-control(5), systemd-oomd.service(8),
oomctl(1)
systemd 249 OOMD.CONF(5)
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