commit db30cff50008546ca00a46f0e6171bbc186cb3c2 · pyrox.dev/nixpkgs

nixos/modules/module-list.nix

···

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         ./services/system/cgmanager.nix

     

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         ./services/system/cloud-init.nix

     

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         ./services/system/dbus.nix

     

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         ./services/system/earlyoom.nix

     

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         ./services/system/kerberos.nix

     

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         ./services/system/nscd.nix

     

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         ./services/system/uptimed.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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       }