nixos/zram: init

1 files changed, 24 insertions, 0 deletions

diff --git a/modules/nixos/traits/zram.nix b/modules/nixos/traits/zram.nix
new file mode 100644
index 0000000..337137a
--- /dev/null
+++ b/modules/nixos/traits/zram.nix
@@ -0,0 +1,24 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  cfg = config.traits.zram;
+in {
+  options.traits.zram = {
+    enable = lib.mkEnableOption "zram setup & configuration";
+  };
+
+  config = lib.mkIf cfg.enable {
+    # https://github.com/pop-os/default-settings/pull/163
+    # https://wiki.archlinux.org/title/Zram#Multiple_zram_devices
+    boot.kernel.sysctl = {
+      "vm.swappiness" = 180;
+      "vm.watermark_boost_factor" = 0;
+      "vm.watermark_scale_factor" = 125;
+      "vm.page-cluster" = 0;
+    };
+
+    zramSwap.enable = true;
+  };
+}