44 lines
1.2 KiB
Nix
44 lines
1.2 KiB
Nix
{ pkgs, lib, config, ... }:
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with lib;
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let
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cfg = config.fudo.system;
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in {
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options.fudo.system = {
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disableTransparentHugePages = mkOption {
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type = types.bool;
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description = ''
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Disable transparent huge pages (recommended for database loads, in
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particular for Redis.
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'';
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default = false;
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};
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postHugePageServices = mkOption {
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type = with types; listOf str;
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description = "List of systemd services that should wait until after THP are disabled.";
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default = [];
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example = ["redis.service"];
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};
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tmpOnTmpfs = mkOption {
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type = types.bool;
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description = "Put tmp filesystem on tmpfs (needs enough RAM).";
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default = true;
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};
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};
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config = mkIf cfg.disableTransparentHugePages {
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systemd.services.disableHugePages = {
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description = "Turn off Transparent Huge Pages (https://www.kernel.org/doc/Documentation/vm/transhuge.txt)";
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after = [ "sysinit.target" "localfs-target" ];
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before = cfg.postHugePageServices;
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enable = true;
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serviceConfig = {
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ExecStart = "/bin/sh -c 'echo never | tee /sys/kernel/mm/transparent_hugepage/enabled > /dev/null";
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Type = "oneshot";
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};
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};
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};
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}
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