commit cd3ffbdfe6869c35c483bc7cec348e8d5365c2b3 · pyrox.dev/nixpkgs

+20

nixos/modules/config/zram.nix

···

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                 {command}`cat /sys/class/block/zram*/comp_algorithm`

     

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               '';

     

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             };

     

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       +
       

     

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             writebackDevice = lib.mkOption {

     

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               default = null;

     

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               example = "/dev/zvol/tarta-zoot/swap-writeback";

     

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               type = lib.types.nullOr lib.types.path;

     

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               description = lib.mdDoc ''

     

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                 Write incompressible pages to this device,

     

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                 as there's no gain from keeping them in RAM.

     

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               '';

     

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             };

     

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           };

     

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         };

     

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         config = lib.mkIf cfg.enable {

     

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       +
       

     

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           assertions = [

     

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             {

     

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               assertion = cfg.writebackDevice == null || cfg.swapDevices <= 1;

     

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               message = "A single writeback device cannot be shared among multiple zram devices";

     

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             }

     

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           ];

     

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       +
       

     

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

     

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             (isModule "ZRAM")

     
···

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                       zram-size = if cfg.memoryMax != null then "min(${size}, ${toString cfg.memoryMax} / 1024 / 1024)" else size;

     

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                       compression-algorithm = cfg.algorithm;

     

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                       swap-priority = cfg.priority;

     

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       +
                     } // lib.optionalAttrs (cfg.writebackDevice != null) {

     

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                       writeback-device = cfg.writebackDevice;

     

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                     };

     

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                 })

     

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                 devices));

+26 -8

nixos/tests/zram-generator.nix

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       import ./make-test-python.nix {

     

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         name = "zram-generator";

     

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       -
         nodes.machine = { ... }: {

     

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       -
           zramSwap = {

     

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       -
             enable = true;

     

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             priority = 10;

     

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             algorithm = "lz4";

     

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             swapDevices = 2;

     

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             memoryPercent = 30;

     

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             memoryMax = 10 * 1024 * 1024;

     

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         nodes = {

     

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           single = { ... }: {

     

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             virtualisation = {

     

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               emptyDiskImages = [ 512 ];

     

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             };

     

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             zramSwap = {

     

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               enable = true;

     

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               priority = 10;

     

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               algorithm = "lz4";

     

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               swapDevices = 1;

     

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               memoryPercent = 30;

     

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               memoryMax = 10 * 1024 * 1024;

     

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               writebackDevice = "/dev/vdb";

     

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             };

     

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           };

     

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           machine = { ... }: {

     

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             zramSwap = {

     

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               enable = true;

     

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               priority = 10;

     

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               algorithm = "lz4";

     

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               swapDevices = 2;

     

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               memoryPercent = 30;

     

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               memoryMax = 10 * 1024 * 1024;

     

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             };

     

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           };

     

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         };

     

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         testScript = ''

     

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           single.wait_for_unit("systemd-zram-setup@zram0.service")

     

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           machine.wait_for_unit("systemd-zram-setup@zram0.service")

     

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           machine.wait_for_unit("systemd-zram-setup@zram1.service")

     

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           zram = machine.succeed("zramctl --noheadings --raw")