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+'\" t
+.TH "OOMD\&.CONF" "5" "" "systemd 255" "oomd.conf"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "NAME"
+oomd.conf, oomd.conf.d \- Global \fBsystemd\-oomd\fR configuration files
+.SH "SYNOPSIS"
+.PP
+/etc/systemd/oomd\&.conf
+.PP
+/etc/systemd/oomd\&.conf\&.d/*\&.conf
+.PP
+/usr/lib/systemd/oomd\&.conf\&.d/*\&.conf
+.SH "DESCRIPTION"
+.PP
+These files configure the various parameters of the
+\fBsystemd\fR(1)
+userspace out\-of\-memory (OOM) killer,
+\fBsystemd-oomd.service\fR(8)\&. See
+\fBsystemd.syntax\fR(7)
+for a general description of the syntax\&.
+.SH "CONFIGURATION DIRECTORIES AND PRECEDENCE"
+.PP
+The default configuration is set during compilation, so configuration is only needed when it is necessary to deviate from those defaults\&. The main configuration file is either in
+/usr/lib/systemd/
+or
+/etc/systemd/
+and contains commented out entries showing the defaults as a guide to the administrator\&. Local overrides can be created by creating drop\-ins, as described below\&. The main configuration file can also be edited for this purpose (or a copy in
+/etc/
+if it\*(Aqs shipped in
+/usr/) however using drop\-ins for local configuration is recommended over modifications to the main configuration file\&.
+.PP
+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\&.
+.PP
+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\&. This also defined a concept of drop\-in priority to allow distributions to ship drop\-ins within a specific range lower than the range used by users\&. This should lower the risk of package drop\-ins overriding accidentally drop\-ins defined by users\&.
+.PP
+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\&.
+.SH "[OOM] SECTION OPTIONS"
+.PP
+The following options are available in the [OOM] section:
+.PP
+\fISwapUsedLimit=\fR
+.RS 4
+Sets the limit for memory and swap usage on the system before
+\fBsystemd\-oomd\fR
+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,
+\fBsystemd\-oomd\fR
+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
+\fIManagedOOMSwap=\fR\&. Takes a value specified in percent (when suffixed with "%"), permille ("‰") or permyriad ("‱"), between 0% and 100%, inclusive\&. Defaults to 90%\&.
+.sp
+Added in version 247\&.
+.RE
+.PP
+\fIDefaultMemoryPressureLimit=\fR
+.RS 4
+Sets the limit for memory pressure on the unit\*(Aqs control group before
+\fBsystemd\-oomd\fR
+will take action\&. A unit can override this value with
+\fIManagedOOMMemoryPressureLimit=\fR\&. 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
+\fIDefaultMemoryPressureDurationSec=\fR,
+\fBsystemd\-oomd\fR
+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
+\fIManagedOOMMemoryPressure=\fR\&. Takes a fraction specified in the same way as
+\fISwapUsedLimit=\fR
+above\&. Defaults to 60%\&.
+.sp
+Added in version 247\&.
+.RE
+.PP
+\fIDefaultMemoryPressureDurationSec=\fR
+.RS 4
+Sets the amount of time a unit\*(Aqs control group needs to have exceeded memory pressure limits before
+\fBsystemd\-oomd\fR
+will take action\&. Memory pressure limits are defined by
+\fIDefaultMemoryPressureLimit=\fR
+and
+\fIManagedOOMMemoryPressureLimit=\fR\&. Must be set to 0, or at least 1 second\&. Defaults to 30 seconds when unset or 0\&.
+.sp
+Added in version 248\&.
+.RE
+.SH "SEE ALSO"
+.PP
+\fBsystemd\fR(1),
+\fBsystemd.resource-control\fR(5),
+\fBsystemd-oomd.service\fR(8),
+\fBoomctl\fR(1)