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")
    '';
})