From a6660555cfc8d181c5facef140019eb5487dd63a Mon Sep 17 00:00:00 2001
From: Antoine Viallon <antoine@lesviallon.fr>
Date: Fri, 8 Apr 2022 21:11:14 +0200
Subject: [PATCH] [Boot] Add option to set loops per jiffies, reducing boot
 time

---
 boot.nix | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/boot.nix b/boot.nix
index 6d2968c..6ca3d9e 100644
--- a/boot.nix
+++ b/boot.nix
@@ -73,6 +73,13 @@ in
       type = types.int;
     };
 
+    loops_per_jiffies = mkOption {
+      description = "Set loops_per_jiffies to given constant, reducing boot-time. A value of 0 means autodetection.";
+      default = 0;
+      example = 4589490;
+      type = types.addCheck types.int (v: v > 500);
+    };
+
     cmdline = mkOption {
       description = "Kernel params as attributes (instead of list)";
       default = { };
@@ -88,6 +95,10 @@ in
 
     aviallon.boot.cmdline = {
       "syscall.x32" = cfg.x32abi.enable;
+      # Sets loops_per_jiffy to given constant, thus avoiding time-consuming boot-time autodetection
+      # https://www.kernel.org/doc/html/v5.15/admin-guide/kernel-parameters.html
+      "lpj" = cfg.loops_per_jiffies;
+
     };
 
     boot = {