initial commit

modules/nixos/virtualisation/hugepages.nix

@@ -0,0 +1,45 @@
+{
+  config,
+  lib,
+  ...
+}:
+
+let
+  cfg = config.virtualisation.hugepages;
+
+  inherit (lib)
+    mkEnableOption
+    mkOption
+    optionals
+    types
+    ;
+in
+{
+  options.virtualisation.hugepages = {
+    enable = mkEnableOption "huge pages.";
+
+    defaultPageSize = mkOption {
+      type = types.strMatching "[0-9]*[kKmMgG]";
+      default = "1M";
+      description = "Default size of huge pages. You can use suffixes K, M, and G to specify KB, MB, and GB.";
+    };
+
+    pageSize = mkOption {
+      type = types.strMatching "[0-9]*[kKmMgG]";
+      default = "1M";
+      description = "Size of huge pages that are allocated at boot. You can use suffixes K, M, and G to specify KB, MB, and GB.";
+    };
+
+    numPages = mkOption {
+      type = types.ints.positive;
+      default = 1;
+      description = "Number of huge pages to allocate at boot.";
+    };
+  };
+
+  config.boot.kernelParams = optionals cfg.enable [
+    "default_hugepagesz=${cfg.defaultPageSize}"
+    "hugepagesz=${cfg.pageSize}"
+    "hugepages=${toString cfg.numPages}"
+  ];
+}