From a8500a0ddc31232e6b21ce5370be0fa1b49c1954 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Fri, 22 Jul 2022 12:17:45 +0200
Subject: [system-tweaks] Disable automatic memory compaction, do at session
 start

---
 .../etc/systemd/system/general-system-tweaks.service  |  7 +++++++
 .../general-system-tweaks.service                     |  1 +
 .../pam/hooks/auth-final-exec.d/99-compact-memory.sh  |  9 +++++++++
 .../opt/openslx/scripts/systemd-general_system_tweaks | 19 +++++++++++++++++++
 4 files changed, 36 insertions(+)
 create mode 100644 core/modules/system-tweaks/data/etc/systemd/system/general-system-tweaks.service
 create mode 120000 core/modules/system-tweaks/data/etc/systemd/system/multi-user.target.wants/general-system-tweaks.service
 create mode 100755 core/modules/system-tweaks/data/opt/openslx/pam/hooks/auth-final-exec.d/99-compact-memory.sh
 create mode 100755 core/modules/system-tweaks/data/opt/openslx/scripts/systemd-general_system_tweaks

(limited to 'core/modules/system-tweaks')

diff --git a/core/modules/system-tweaks/data/etc/systemd/system/general-system-tweaks.service b/core/modules/system-tweaks/data/etc/systemd/system/general-system-tweaks.service
new file mode 100644
index 00000000..8bf67972
--- /dev/null
+++ b/core/modules/system-tweaks/data/etc/systemd/system/general-system-tweaks.service
@@ -0,0 +1,7 @@
+[Unit]
+Description=Apply general system tweaks
+
+[Service]
+ExecStart=/opt/openslx/scripts/systemd-general_system_tweaks
+Type=oneshot
+RemainAfterExit=true
diff --git a/core/modules/system-tweaks/data/etc/systemd/system/multi-user.target.wants/general-system-tweaks.service b/core/modules/system-tweaks/data/etc/systemd/system/multi-user.target.wants/general-system-tweaks.service
new file mode 120000
index 00000000..11e1b73f
--- /dev/null
+++ b/core/modules/system-tweaks/data/etc/systemd/system/multi-user.target.wants/general-system-tweaks.service
@@ -0,0 +1 @@
+../general-system-tweaks.service
\ No newline at end of file
diff --git a/core/modules/system-tweaks/data/opt/openslx/pam/hooks/auth-final-exec.d/99-compact-memory.sh b/core/modules/system-tweaks/data/opt/openslx/pam/hooks/auth-final-exec.d/99-compact-memory.sh
new file mode 100755
index 00000000..6d35a3cc
--- /dev/null
+++ b/core/modules/system-tweaks/data/opt/openslx/pam/hooks/auth-final-exec.d/99-compact-memory.sh
@@ -0,0 +1,9 @@
+#!/bin/ash
+
+# Compact memory now once at start of graphical session,
+# So VM will have as much contiguous blocks available
+# as possible.
+if [ "$PAM_TTY" = ":0" ]; then
+	echo 1 > /proc/sys/vm/compact_memory
+fi
+exit 0
diff --git a/core/modules/system-tweaks/data/opt/openslx/scripts/systemd-general_system_tweaks b/core/modules/system-tweaks/data/opt/openslx/scripts/systemd-general_system_tweaks
new file mode 100755
index 00000000..389a3ca2
--- /dev/null
+++ b/core/modules/system-tweaks/data/opt/openslx/scripts/systemd-general_system_tweaks
@@ -0,0 +1,19 @@
+#!/bin/ash
+
+# General stuff
+
+# Breaks performance with certain workloads, so disable.
+# See https://unix.stackexchange.com/a/185172 for details and further references
+echo never > /sys/kernel/mm/transparent_hugepage/defrag
+echo 0 > /sys/kernel/mm/transparent_hugepage/khugepaged/defrag
+# New player in town doing pretty much the same, tame it
+echo 1 > /proc/sys/vm/compaction_proactiveness # default 20
+
+# run-parts-like stuff
+DIR="$0.d"
+if [ -d "$DIR" ]; then
+	for file in "$DIR"/*; do
+		[ -x "$file" ] && "$file"
+	done
+fi
+exit 0
-- 
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