From 8d3fe232e31a7b945c4613923e9395ed6152375f Mon Sep 17 00:00:00 2001
From: Adrian Pistol <vifino@tty.sh>
Date: Sun, 30 Oct 2022 16:47:12 +0100
Subject: [PATCH] linux: Set CONFIG_NO_HZ_FULL=y.

CONFIG_NO_HZ_FULL=y should be set to enable the `nohz_full=` and
`rcu_nocbs=` options. These carry no additional performance penalty
compared to CONFIG_NO_HZ_IDLE and behaves like it by default,
but allows disabling the tick interrupts on cores for power or
performance reasons.

[Debian][1] also applied the change to all their kernels.
Like the Kernel says: "If you're a distro say Y."

[1]: https://salsa.debian.org/kernel-team/linux/-/commit/f6aad27f05c007d6f30b34ff77bc7ea47844f117
---
 pkgs/os-specific/linux/kernel/common-config.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/os-specific/linux/kernel/common-config.nix b/pkgs/os-specific/linux/kernel/common-config.nix
index 57fe7420f481..3c1bbb73fda5 100644
--- a/pkgs/os-specific/linux/kernel/common-config.nix
+++ b/pkgs/os-specific/linux/kernel/common-config.nix
@@ -114,6 +114,12 @@ let
       IOSCHED_BFQ = whenAtLeast "4.12" module;
     };
 
+
+    timer = {
+      # Enable Full Dynticks System.
+      NO_HZ_FULL = yes;
+    };
+
     # Enable NUMA.
     numa = {
       NUMA  = option yes;