From bb6167236adff855c425a78b9d942507da2914bb Mon Sep 17 00:00:00 2001
From: Antoine Viallon <antoine@lesviallon.fr>
Date: Sun, 9 Mar 2025 20:58:49 +0100
Subject: [PATCH] [Laptop] enable lazy preemption if we are on kernel 6.13+

It reduces power usage by making better use of system resources. It also
improves throughput.
---
 laptop.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/laptop.nix b/laptop.nix
index 0ae9eb2..abce30e 100644
--- a/laptop.nix
+++ b/laptop.nix
@@ -36,6 +36,9 @@ in {
       # To save power, batch RCU callbacks and flush after delay, memory pressure or callback list growing too big.
       "rcutree.enable_rcu_lazy" = "1";
 
+      # Enable lazy preempt by default for kernels newer than 6.13
+      "preempt" = mkIf (config.boot.kernelPackages.kernelAtLeast "6.13") "lazy";
+
       pcie_aspm = mkIf cfg.tweaks.pcieAspmForce "force";
     };