nixpkgs/nixos/modules/hardware/ksm.nix
Silvan Mosberger 4ee3e8b21d
nixos/treewide: Move rename.nix imports to their respective modules
A centralized list for these renames is not good because:
- It breaks disabledModules for modules that have a rename defined
- Adding/removing renames for a module means having to find them in the
central file
- Merge conflicts due to multiple people editing the central file
2019-12-10 02:51:19 +01:00

39 lines
995 B
Nix

{ config, lib, ... }:
with lib;
let
cfg = config.hardware.ksm;
in {
imports = [
(mkRenamedOptionModule [ "hardware" "enableKSM" ] [ "hardware" "ksm" "enable" ])
];
options.hardware.ksm = {
enable = mkEnableOption "Kernel Same-Page Merging";
sleep = mkOption {
type = types.nullOr types.int;
default = null;
description = ''
How many milliseconds ksmd should sleep between scans.
Setting it to <literal>null</literal> uses the kernel's default time.
'';
};
};
config = mkIf cfg.enable {
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
${optionalString (cfg.sleep != null) ''echo ${toString cfg.sleep} > /sys/kernel/mm/ksm/sleep_millisecs''}
fi
'';
};
};
}