Move zram-swap to a module

modules/default.nix

@@ -54,5 +54,6 @@
     ./services/telegram-notifications
     ./services/tlp
     ./services/virtualbox-guest
+    ./services/zram-swap
   ];
 }

modules/services/zram-swap/default.nix

@@ -0,0 +1,25 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.services.az-zram-swap;
+in
+{
+  options = {
+    services.az-ram-swap.enable = lib.mkEnableOption "Enable zram swap";
+  };
+
+  config = lib.mkIf cfg.enable {
+    zramSwap = {
+      enable = true;
+      priority = 100;
+    };
+    # Since we have "fast" swap, we can increase swappiness
+    boot.kernel.sysctl = {
+      "vm.swappiness" = 180;
+    };
+  };
+}

systems/gwyn/default.nix

@@ -62,11 +62,6 @@
 
   networking.hostName = hostname;
 
-  zramSwap = {
-    enable = true;
-    priority = 100;
-  };
-
   swapDevices = [ { device = "/dev/disk/by-label/swap"; } ];
 
   hardware = {
@@ -90,6 +85,7 @@
     az-restic-client-desktop.enable = true;
     az-tlp.enable = true;
     az-x86.enable = true;
+    az-zram-swap.enable = true;
     fstrim.enable = true; # Enable TRIM for SD cards
     hardware.bolt.enable = true; # Enable Thunderbolt control
     logind.lidSwitchExternalPower = "ignore";

systems/management/default.nix

@@ -9,11 +9,6 @@
     };
   };
 
-  zramSwap = {
-    enable = true;
-    priority = 100;
-  };
-
   # Features
   profiles.az-server.enable = true;
   services = {
@@ -27,6 +22,7 @@
       tag = "management";
       time = "23:30";
     };
+    az-zram-swap.enable = true;
   };
   # Enable dictionaries
   programs = {

systems/proxy/default.nix

@@ -9,11 +9,6 @@
     };
   };
 
-  zramSwap = {
-    enable = true;
-    priority = 100;
-  };
-
   profiles.az-server.enable = true;
   services = {
     az-acme-base.enable = true;
@@ -26,6 +21,7 @@
       tag = "proxy";
       time = "00:00";
     };
+    az-zram-swap.enable = true;
     nginx = {
       commonHttpConfig = ''
         # Add HSTS header with preloading to HTTPS requests.