nixos/modules/hardware/ksm.nix


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{ config, lib, ... }:

{
  options.hardware.enableKSM = lib.mkEnableOption "Kernel Same-Page Merging";

  config = lib.mkIf config.hardware.enableKSM {
    systemd.services.enable-ksm = {
      description = "Enable Kernel Same-Page Merging";
      wantedBy = [ "multi-user.target" ];
      after = [ "systemd-udev-settle.service" ];
      script = ''
        if [ -e /sys/kernel/mm/ksm ]; then
          echo 1 > /sys/kernel/mm/ksm/run
        fi
      '';
    };
  };
}