linux/debian/patches/patchset-xanmod/xanmod/0012-XANMOD-sched-autogroup-Add-kernel-parameter-and-conf.patch

From a24ca4c968092cf419821aaaa57b070c088e74e7 Mon Sep 17 00:00:00 2001
From: Alexandre Frade <kernel@xanmod.org>
Date: Wed, 15 Jun 2022 17:07:29 +0000
Subject: [PATCH 14/18] XANMOD: sched/autogroup: Add kernel parameter and
 config option to enable/disable autogroup feature by default

Signed-off-by: Alexandre Frade <kernel@xanmod.org>
---
 Documentation/admin-guide/kernel-parameters.txt |  6 ++++--
 init/Kconfig                                    | 12 ++++++++++++
 kernel/sched/autogroup.c                        |  9 ++++++---
 3 files changed, 22 insertions(+), 5 deletions(-)

--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -498,6 +498,10 @@
 			Format: <int> (must be >=0)
 			Default: 64
 
+	autogroup=	[KNL] Enable or disable scheduler automatic task group
+			creation.
+			Format: <bool>
+
 	bau=		[X86_UV] Enable the BAU on SGI UV.  The default
 			behavior is to disable the BAU (i.e. bau=0).
 			Format: { "0" | "1" }
@@ -3881,8 +3885,6 @@
 	noapic		[SMP,APIC,EARLY] Tells the kernel to not make use of any
 			IOAPICs that may be present in the system.
 
-	noautogroup	Disable scheduler automatic task group creation.
-
 	nocache		[ARM,EARLY]
 
 	no_console_suspend
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1353,6 +1353,18 @@ config SCHED_AUTOGROUP
 	  desktop applications.  Task group autogeneration is currently based
 	  upon task session.
 
+config SCHED_AUTOGROUP_DEFAULT_ENABLED
+	bool "Enable automatic process group scheduling feature"
+	default y
+	depends on SCHED_AUTOGROUP
+	help
+	  If set, automatic process group scheduling will be enabled per
+	  default but can be disabled through passing autogroup=0 on the
+	  kernel commandline during boot or a value of 0 via the file
+	  proc/sys/kernel/sched_autogroup_enabled.
+
+	  If unsure say Y.
+
 config RELAY
 	bool "Kernel->user space relay support (formerly relayfs)"
 	select IRQ_WORK
--- a/kernel/sched/autogroup.c
+++ b/kernel/sched/autogroup.c
@@ -4,7 +4,8 @@
  * Auto-group scheduling implementation:
  */
 
-unsigned int __read_mostly sysctl_sched_autogroup_enabled = 1;
+unsigned int __read_mostly sysctl_sched_autogroup_enabled =
+		IS_ENABLED(CONFIG_SCHED_AUTOGROUP_DEFAULT_ENABLED) ? 1 : 0;
 static struct autogroup autogroup_default;
 static atomic_t autogroup_seq_nr;
 
@@ -219,11 +220,13 @@ void sched_autogroup_exit(struct signal_
 
 static int __init setup_autogroup(char *str)
 {
-	sysctl_sched_autogroup_enabled = 0;
+	unsigned long enabled;
+	if (!kstrtoul(str, 0, &enabled))
+		sysctl_sched_autogroup_enabled = enabled ? 1 : 0;
 
 	return 1;
 }
-__setup("noautogroup", setup_autogroup);
+__setup("autogroup=", setup_autogroup);
 
 #ifdef CONFIG_PROC_FS