38 lines
995 B
Nix
38 lines
995 B
Nix
{ config, lib, ... }:
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with lib;
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let
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cfg = config.hardware.ksm;
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in {
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imports = [
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(mkRenamedOptionModule [ "hardware" "enableKSM" ] [ "hardware" "ksm" "enable" ])
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];
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options.hardware.ksm = {
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enable = mkEnableOption "Kernel Same-Page Merging";
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sleep = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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How many milliseconds ksmd should sleep between scans.
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Setting it to <literal>null</literal> uses the kernel's default time.
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'';
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};
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};
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config = mkIf cfg.enable {
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systemd.services.enable-ksm = {
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description = "Enable Kernel Same-Page Merging";
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wantedBy = [ "multi-user.target" ];
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after = [ "systemd-udev-settle.service" ];
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script = ''
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if [ -e /sys/kernel/mm/ksm ]; then
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echo 1 > /sys/kernel/mm/ksm/run
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${optionalString (cfg.sleep != null) ''echo ${toString cfg.sleep} > /sys/kernel/mm/ksm/sleep_millisecs''}
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fi
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'';
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};
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};
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}
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