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{ config, lib, ... }:
let
inherit (config.boot.kernelPackages.kernel) version;
inherit (lib) optionalString versionAtLeast versionOlder;
in {
options.vuizvui.system.kernel.bfq = {
enable = lib.mkEnableOption "Enable the BFQ scheduler by default";
};
config = lib.mkIf config.vuizvui.system.kernel.bfq.enable {
boot.kernelPatches = lib.singleton {
name = "bfq";
patch =
if versionAtLeast version "5.4" then ./bfq-by-default-5.4.patch
else if versionAtLeast version "4.18" then ./bfq-by-default-4.18.patch
else if versionAtLeast version "4.15" then ./bfq-by-default-4.15.patch
else ./bfq-by-default.patch;
extraConfig = ''
SCSI_MQ_DEFAULT? y
DM_MQ_DEFAULT? y
IOSCHED_BFQ y
BFQ_GROUP_IOSCHED y
'';
};
vuizvui.requiresTests = lib.singleton ["vuizvui" "system" "kernel" "bfq"];
assertions = lib.singleton {
assertion = versionAtLeast version "4.12";
message = "The BFQ scheduler in conjunction with blk-mq requires "
+ "at least kernel 4.12.";
};
};
}
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