nixdots/system/roles/workstation/services/earlyoom.nix

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{pkgs, lib, config, ...}: let
inherit (lib) mkIf;
deviceType = config.myOptions.device.roles.type;
acceptedTypes = ["laptop" "desktop"];
in {
config = mkIf (builtins.elem deviceType acceptedTypes) {
# https://dataswamp.org/~solene/2022-09-28-earlyoom.html
# avoid the linux kernel locking itself when we're putting too much strain on the memory
# this helps avoid having to shut down forcefully when we OOM
services.earlyoom = {
enable = true;
enableNotifications = true; # annoying, but we want to know what's killed
freeSwapThreshold = 2;
freeMemThreshold = 2;
extraArgs = [
"-g" # kill all processes within a process group
"--avoid 'Hyprland|soffice|soffice.bin|firefox|thunderbird)$'" # things we want to not kill
"--prefer '^(electron|.*.exe)$'" # I wish we could kill electron permanently
];
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# we should ideally write the logs into a designated log file; or even better, to the journal
# for now we can hope this echo sends the log to somewhere we can observe later
killHook = pkgs.writeShellScript "earlyoom-kill-hook" ''
echo "Process $EARLYOOM_NAME ($EARLYOOM_PID) was killed"
'';
};
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};
}