tjh.dev
earlyoom service: init
+1
nixos/modules/module-list.nix
+1
nixos/modules/module-list.nix
+96
nixos/modules/services/system/earlyoom.nix
+96
nixos/modules/services/system/earlyoom.nix
···
···
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{ config, lib, pkgs, ... }:
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with lib;
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let
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ecfg = config.services.earlyoom;
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in
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{
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options = {
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services.earlyoom = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Enable early out of memory killing.
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'';
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};
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freeMemThreshold = mkOption {
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type = types.int;
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default = 10;
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description = ''
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Minimum of availabe memory (in percent).
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If the free memory falls below this threshold and the analog is true for
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<option>services.earlyoom.freeSwapThreshold</option>
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the killing begins.
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'';
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};
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freeSwapThreshold = mkOption {
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type = types.int;
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default = 10;
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description = ''
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Minimum of availabe swap space (in percent).
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If the available swap space falls below this threshold and the analog
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is true for <option>services.earlyoom.freeMemThreshold</option>
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the killing begins.
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'';
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};
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useKernelOOMKiller= mkOption {
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type = types.bool;
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default = false;
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description = ''
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Use kernel OOM killer instead of own user-space implementation.
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'';
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};
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ignoreOOMScoreAdjust = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Ignore oom_score_adjust values of processes.
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User-space implementation only.
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'';
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};
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enableDebugInfo = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Enable debugging messages.
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'';
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};
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};
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};
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config = mkIf ecfg.enable {
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assertions = [
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{ assertion = ecfg.freeMemThreshold > 0 && ecfg.freeMemThreshold <= 100;
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message = "Needs to be a positive percentage"; }
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{ assertion = ecfg.freeSwapThreshold > 0 && ecfg.freeSwapThreshold <= 100;
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message = "Needs to be a positive percentage"; }
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{ assertion = !ecfg.useKernelOOMKiller || !ecfg.ignoreOOMScoreAdjust;
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message = "Both options in conjunction do not make sense"; }
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];
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systemd.services.earlyoom = {
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description = "Early OOM Daemon for Linux";
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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StandardOutput = "null";
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StandardError = "syslog";
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ExecStart = ''
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${pkgs.earlyoom}/bin/earlyoom \
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-m ${toString ecfg.freeMemThreshold} \
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-s ${toString ecfg.freeSwapThreshold} \
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${optionalString ecfg.useKernelOOMKiller "-k"} \
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${optionalString ecfg.ignoreOOMScoreAdjust "-i"} \
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${optionalString ecfg.enableDebugInfo "-d"}
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'';
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};
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};
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};
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}