feat(memory): declare 'memory' module

hosts/andromache/default.nix

@@ -44,6 +44,7 @@ in
   };
   keyboard.enable = true;
   localization.enable = true;
+  memory.zram.enable = true;
   my = {
     fonts.enable = true;
     stylix.enable = true;
@@ -91,6 +92,7 @@ in
     enable = true;
     interfaces.eno1 = { inherit (wolInterfaces.eno1) macAddress; };
   };
+  zfs.enable = true;
 
   disko.devices = {
     disk.data = {
@@ -120,6 +122,4 @@ in
     enable = true;
     package = pkgs.plocate;
   };
-
-  zramSwap.enable = true;
 }

hosts/astyanax/default.nix

@@ -42,6 +42,10 @@ in
   };
   keyboard.enable = true;
   localization.enable = true;
+  memory = {
+    oom.enable = true;
+    zram.enable = true;
+  };
   my = {
     fonts.enable = true;
     stylix.enable = true;
@@ -67,6 +71,7 @@ in
     };
   };
   taskwarrior.enable = true;
+  zfs.enable = true;
 
   secrets.nixSigningKey.enable = true;
   restic-backup.enable = true;
@@ -125,7 +130,4 @@ in
       };
     };
   };
-
-  zramSwap.enable = true;
-  systemd.oomd.enableUserSlices = true;
 }

modules/boot/bootloader.nix

@@ -1,11 +0,0 @@
-{ config, ... }:
-
-{
-  boot = {
-    loader = {
-      systemd-boot.enable = true;
-      efi.canTouchEfiVariables = true;
-    };
-    tmp.useTmpfs = config.host.highRam;
-  };
-}

modules/boot/default.nix

@@ -1,18 +0,0 @@
-{ lib, config, ... }:
-
-let
-  cfg = config.bootloader;
-in
-{
-  options.bootloader.enable = lib.mkEnableOption "system bootloader";
-
-  config = lib.mkIf cfg.enable {
-    boot = {
-      loader = {
-        systemd-boot.enable = true;
-        efi.canTouchEfiVariables = true;
-      };
-      tmp.useTmpfs = config.host.highRam;
-    };
-  };
-}

modules/bootloader/default.nix

@@ -0,0 +1,17 @@
+{ lib, config, ... }:
+
+{
+  options.bootloader.enable = lib.mkOption {
+    default = false;
+    type = lib.types.bool;
+  };
+
+  config = lib.mkIf config.bootloader.enable {
+    boot = {
+      loader = {
+        systemd-boot.enable = true;
+        efi.canTouchEfiVariables = true;
+      };
+    };
+  };
+}

modules/common/default.nix

@@ -12,7 +12,6 @@
 
   config = {
     system.stateVersion = lib.mkDefault "25.05";
-    boot.zfs.forceImportRoot = lib.mkDefault false;
 
     environment.defaultPackages = lib.mkForce [ ];
     environment.pathsToLink = [

modules/common/embedded.nix

@@ -5,10 +5,8 @@
     system.autoUpgrade.enable = false;
     nix.settings.max-jobs = 0;
 
-    zramSwap = {
-      enable = true;
-      memoryPercent = 100;
-    };
+    memory.zram.enable = true;
+    zramSwap.memoryPercent = 100;
 
     services.journald.settings.Journal.SystemMaxUse = "100M";
   };

modules/memory/default.nix

@@ -0,0 +1,13 @@
+{ lib, ... }:
+
+{
+  imports = [
+    ./oom.nix
+    ./zram.nix
+  ];
+
+  options.memory = {
+    oom.enable = lib.mkOption { default = false; };
+    zram.enable = lib.mkOption { default = false; };
+  };
+}

modules/memory/oom.nix

@@ -0,0 +1,7 @@
+{ config, lib, ... }:
+
+{
+  config = lib.mkIf config.memory.oom.enable {
+    systemd.oomd.enableUserSlices = lib.mkDefault true;
+  };
+}

modules/memory/zram.nix

@@ -0,0 +1,11 @@
+{ config, lib, ... }:
+
+{
+  config = lib.mkIf config.memory.zram.enable {
+    zramSwap.enable = true;
+    boot.kernel.sysctl = {
+      "vm.swappiness" = lib.mkDefault 180;
+      "vm.page-cluster" = lib.mkDefault 0;
+    };
+  };
+}

modules/tmp/default.nix

@@ -0,0 +1,15 @@
+{ lib, config, ... }:
+
+{
+  options.tmp.enable = lib.mkOption {
+    default = config.host.highRam;
+    type = lib.types.bool;
+  };
+
+  config = lib.mkIf config.tmp.enable {
+    boot.tmp = {
+      useTmpfs = true;
+      tmpfsSize = "25%";
+    };
+  };
+}

modules/zfs/default.nix

@@ -0,0 +1,15 @@
+{ lib, config, ... }:
+
+{
+  options.zfs.enable = lib.mkOption {
+    default = false;
+    type = lib.types.bool;
+  };
+
+  config = lib.mkIf config.zfs.enable {
+    boot = {
+      kernelParams = [ "zfs.zfs_arc_max=12884901888" ];
+      zfs.forceImportRoot = lib.mkDefault false;
+    };
+  };
+}