commit cd1b48bc3541a800f49ca154b475796f4241dc3f · pyrox.dev/nixpkgs

+138

nixos/modules/config/zram.nix

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       { config, lib, pkgs, ... }:

     

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       with lib;

     

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       let

     

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         cfg = config.zramSwap;

     

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         devices = map (nr: "zram${toString nr}") (range 0 (cfg.numDevices - 1));

     

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         modprobe = "${config.system.sbin.modprobe}/sbin/modprobe";

     

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       in

     

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       {

     

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         ###### interface

     

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         options = {

     

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           zramSwap = {

     

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             enable = mkOption {

     

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               default = false;

     

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               type = types.bool;

     

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               description = ''

     

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                 Enable in-memory compressed swap space provided by the zram kernel

     

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                 module. It is recommended to enable only for kernel 3.14 or higher.

     

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               '';

     

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             };

     

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             numDevices = mkOption {

     

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               default = 4;

     

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               type = types.int;

     

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               description = ''

     

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                 Number of zram swap devices to create. It should be equal to the

     

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                 number of CPU cores your system has.

     

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               '';

     

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             };

     

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             memoryPercent = mkOption {

     

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               default = 50;

     

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               type = types.int;

     

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               description = ''

     

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                 Maximum amount of memory that can be used by the zram swap devices

     

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                 (as a percentage of your total memory). Defaults to 1/2 of your total

     

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                 RAM.

     

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               '';

     

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             };

     

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             priority = mkOption {

     

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               default = 5;

     

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               type = types.int;

     

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               description = ''

     

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                 Priority of the zram swap devices. It should be a number higher than

     

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                 the priority of your disk-based swap devices (so that the system will

     

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                 fill the zram swap devices before falling back to disk swap).

     

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               '';

     

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             };

     

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           };

     

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         };

     

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         config = mkIf cfg.enable {

     

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           system.requiredKernelConfig = with config.lib.kernelConfig; [

     

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             (isModule "ZRAM")

     

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           ];

     

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           # Disabling this for the moment, as it would create and mkswap devices twice,

     

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           # once in stage 2 boot, and again when the zram-reloader service starts.

     

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           # boot.kernelModules = [ "zram" ];

     

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           boot.extraModprobeConfig = ''

     

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             options zram num_devices=${toString cfg.numDevices}

     

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           '';

     

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           services.udev.extraRules = ''

     

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             KERNEL=="zram[0-9]*", ENV{SYSTEMD_WANTS}="zram-init-%k.service", TAG+="systemd"

     

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           '';

     

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           systemd.services =

     

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             let

     

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               createZramInitService = dev:

     

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                 nameValuePair "zram-init-${dev}" {

     

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                   description = "Init swap on zram-based device ${dev}";

     

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                   bindsTo = [ "dev-${dev}.swap" ];

     

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                   after = [ "dev-${dev}.device" "zram-reloader.service" ];

     

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                   requires = [ "dev-${dev}.device" "zram-reloader.service" ];

     

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                   before = [ "dev-${dev}.swap" ];

     

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                   requiredBy = [ "dev-${dev}.swap" ];

     

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                   serviceConfig = {

     

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                     Type = "oneshot";

     

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                     RemainAfterExit = true;

     

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                     ExecStop = "${pkgs.stdenv.shell} -c 'echo 1 > /sys/class/block/${dev}/reset'";

     

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                   };

     

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                   script = ''

     

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                     set -u

     

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                     set -o pipefail

     

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                     PATH=${pkgs.procps}/bin:${pkgs.gnugrep}/bin:${pkgs.gnused}/bin

     

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                     # Calculate memory to use for zram

     

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                     totalmem=$(free | grep -e "^Mem:" | sed -e 's/^Mem: *//' -e 's/  *.*//')

     

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                     mem=$(((totalmem * ${toString cfg.memoryPercent} / 100 / ${toString cfg.numDevices}) * 1024))

     

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                     echo $mem > /sys/class/block/${dev}/disksize

     

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                     ${pkgs.utillinux}/sbin/mkswap /dev/${dev}

     

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                   '';

     

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                   restartIfChanged = false;

     

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                 };

     

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             in listToAttrs ((map createZramInitService devices) ++ [(nameValuePair "zram-reloader"

     

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               {

     

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                 description = "Reload zram kernel module when number of devices changes";

     

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                 serviceConfig = {

     

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                   Type = "oneshot";

     

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                   RemainAfterExit = true;

     

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                   ExecStartPre = "${modprobe} -r zram";

     

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                   ExecStart = "${modprobe} zram";

     

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                   ExecStop = "${modprobe} -r zram";

     

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                 };

     

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                 restartTriggers = [ cfg.numDevices ];

     

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                 restartIfChanged = true;

     

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               })]);

     

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           swapDevices =

     

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             let

     

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               useZramSwap = dev:

     

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                 {

     

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                   device = "/dev/${dev}";

     

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                   priority = cfg.priority;

     

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                 };

     

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             in map useZramSwap devices;

     

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         };

     

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       }

nixos/modules/module-list.nix

···

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         ./config/timezone.nix

     

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         ./config/unix-odbc-drivers.nix

     

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         ./config/users-groups.nix

     

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         ./config/zram.nix

     

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         ./hardware/all-firmware.nix

     

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         ./hardware/cpu/intel-microcode.nix

     

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         ./hardware/cpu/amd-microcode.nix