58 lines
2 KiB
Nix
58 lines
2 KiB
Nix
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{ config, lib, ... }: let
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cfg = config.systemd.oomd;
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in {
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options.systemd.oomd = {
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enable = lib.mkEnableOption (lib.mdDoc "the `systemd-oomd` OOM killer") // { default = true; };
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# Fedora enables the first and third option by default. See the 10-oomd-* files here:
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# https://src.fedoraproject.org/rpms/systemd/tree/acb90c49c42276b06375a66c73673ac351025597
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enableRootSlice = lib.mkEnableOption (lib.mdDoc "oomd on the root slice (`-.slice`)");
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enableSystemSlice = lib.mkEnableOption (lib.mdDoc "oomd on the system slice (`system.slice`)");
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enableUserServices = lib.mkEnableOption (lib.mdDoc "oomd on all user services (`user@.service`)");
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extraConfig = lib.mkOption {
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type = with lib.types; attrsOf (oneOf [ str int bool ]);
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default = {};
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example = lib.literalExpression ''{ DefaultMemoryPressureDurationSec = "20s"; }'';
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description = lib.mdDoc ''
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Extra config options for `systemd-oomd`. See {command}`man oomd.conf`
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for available options.
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'';
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};
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};
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config = lib.mkIf cfg.enable {
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systemd.additionalUpstreamSystemUnits = [
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"systemd-oomd.service"
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"systemd-oomd.socket"
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];
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systemd.services.systemd-oomd.wantedBy = [ "multi-user.target" ];
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environment.etc."systemd/oomd.conf".text = lib.generators.toINI {} {
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OOM = cfg.extraConfig;
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};
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systemd.oomd.extraConfig.DefaultMemoryPressureDurationSec = lib.mkDefault "20s"; # Fedora default
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users.users.systemd-oom = {
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description = "systemd-oomd service user";
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group = "systemd-oom";
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isSystemUser = true;
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};
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users.groups.systemd-oom = { };
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systemd.slices."-".sliceConfig = lib.mkIf cfg.enableRootSlice {
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ManagedOOMSwap = "kill";
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};
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systemd.slices."system".sliceConfig = lib.mkIf cfg.enableSystemSlice {
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ManagedOOMSwap = "kill";
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};
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systemd.services."user@".serviceConfig = lib.mkIf cfg.enableUserServices {
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ManagedOOMMemoryPressure = "kill";
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ManagedOOMMemoryPressureLimit = "50%";
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};
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};
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}
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