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nixos/hardware: Add option to enable KSM.

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This is essentially what's been done for the official NixOS build slaves
and I'm using it as well for a few of my machines and my own Hydra
slaves.

Here's the same implementation from the Delft server configurations:

f47c2fc7f8/delft/common.nix (L91-L101)

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
This commit is contained in:
aszlig 2015-04-01 19:55:49 +02:00
parent eecb59a805
commit 224ed7e798
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2 changed files with 19 additions and 0 deletions
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18
nixos/modules/hardware/ksm.nix Normal file
View file

@ -0,0 +1,18 @@
{ 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
'';
};
};
}

1
nixos/modules/module-list.nix
View file

@ -29,6 +29,7 @@
./hardware/all-firmware.nix
./hardware/cpu/amd-microcode.nix
./hardware/cpu/intel-microcode.nix
./hardware/ksm.nix
./hardware/network/b43.nix
./hardware/network/intel-2100bg.nix
./hardware/network/intel-2200bg.nix