Author: simons
Date: Fri Dec 16 23:44:37 2011
New Revision: 30949
URL: https://nixos.org/websvn/nix/?rev=30949&sc=1
Log:
Added cpuFreqGovernor option to configure a CPU frequency governor.
Added:
nixos/trunk/modules/tasks/cpu-freq.nix
Modified:
nixos/trunk/modules/module-list.nix
Modified: nixos/trunk/modules/module-list.nix
==============================================================================
--- nixos/trunk/modules/module-list.nix Fri Dec 16 23:33:01 2011 (r30948)
+++ nixos/trunk/modules/module-list.nix Fri Dec 16 23:44:37 2011 (r30949)
@@ -190,6 +190,7 @@
./system/upstart-events/runlevel.nix
./system/upstart-events/shutdown.nix
./system/upstart/upstart.nix
+ ./tasks/cpu-freq.nix
./tasks/filesystems.nix
./tasks/kbd.nix
./tasks/lvm.nix
Added: nixos/trunk/modules/tasks/cpu-freq.nix
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ nixos/trunk/modules/tasks/cpu-freq.nix Fri Dec 16 23:44:37 2011
(r30949)
@@ -0,0 +1,39 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+{
+ ###### interface
+
+ options = {
+ cpuFreqGovernor = mkOption {
+ default = "";
+ example = "ondemand";
+ description = ''
+ Configure the governor used to regulate the frequence of the
+ available CPUs. By default, the kernel configures the governor
+ "userspace".
+ '';
+ };
+ };
+
+
+ ###### implementation
+
+ config = mkIf (config.cpuFreqGovernor != "") ({
+ jobs.cpuFreq =
+ { description = "Initialize CPU frequency governor";
+
+ startOn = "started udev";
+
+ task = true;
+
+ script = ''
+ for i in $(seq 0 $(($(nproc) - 1))); do
+ ${pkgs.cpufrequtils}/bin/cpufreq-set -g ${config.cpuFreqGovernor}
-c $i
+ done
+ '';
+ };
+ });
+
+}
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