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nixpkgs/nixos/modules/hardware/ksm.nix
aszlig 224ed7e798
nixos/hardware: Add option to enable KSM.
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>
2015-04-01 20:00:27 +02:00

19 lines
472 B
Nix

{ 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
'';
};
};
}