nixpkgs/nixos/tests/ksm.nix

import ./make-test-python.nix (
  { lib, ... }:

  {
    name = "ksm";
    meta = with lib.maintainers; {
      maintainers = [ rnhmjoj ];
    };

    nodes.machine =
      { ... }:
      {
        imports = [ ../modules/profiles/minimal.nix ];

        hardware.ksm.enable = true;
        hardware.ksm.sleep = 300;
      };

    testScript = ''
      machine.start()
      machine.wait_until_succeeds("test $(</sys/kernel/mm/ksm/run) -eq 1")
      machine.wait_until_succeeds("test $(</sys/kernel/mm/ksm/sleep_millisecs) -eq 300")
    '';
  }
)