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LowMem: Slim down initramfs and set /run size

This commit is contained in:
Austin Lane 2025-11-09 18:05:27 -05:00 committed by Igor
parent 66453c636f
commit 4c68c97ce7
1 changed files with 22 additions and 11 deletions
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33
extensions/lowmem.sh
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@ -8,6 +8,28 @@
# at build time.
#
function post_family_tweaks_bsp__initramfs() {
local LOWMEM_TMPFS_RUN_MB=${LOWMEM_TMPFS_RUN_MB:-20}
display_alert "${EXTENSION}" "Set initramfs config for low memory" "debug"
# Create /etc/initramfs-tools/conf.d/armbian-lowmem.conf configuration file
if [ ! -f "$destination/etc/initramfs-tools/conf.d/armbian-lowmem.conf" ]; then
mkdir -p "$destination/etc/initramfs-tools/conf.d"
install -m 644 /dev/null "$destination/etc/initramfs-tools/conf.d/armbian-lowmem.conf"
# Load only modules needed for boot
echo "MODULES=dep" >> "$destination/etc/initramfs-tools/conf.d/armbian-lowmem.conf"
# /run is 10% of RAM by default
# systemd throws errors when <16MB is *free* in this partition
# during daemon-reload operations.
# Address with a fixed /run size of ${LOWMEM_TMPFS_RUN_MB}
echo "RUNSIZE=${LOWMEM_TMPFS_RUN_MB}M" >> "$destination/etc/initramfs-tools/conf.d/armbian-lowmem.conf"
fi
return 0
}
function post_family_tweaks_bsp__copy_lowmem_config() {
display_alert "${EXTENSION}" "Installing default configuration" "debug"
@ -41,7 +63,6 @@ function post_family_tweaks__enable_lowmem_mkswap() {
}
function pre_umount_final_image__memory_optimize_defaults() {
local LOWMEM_TMPFS_RUN_MB=${LOWMEM_TMPFS_RUN_MB:-20}
# Optimize /etc/default settings to reduce memory usage
display_alert "${EXTENSION}" "Disabling ramlog by default to save memory" "debug"
sed -i "s/^ENABLED=.*/ENABLED=false/" "${MOUNT}"/etc/default/armbian-ramlog
@ -49,15 +70,5 @@ function pre_umount_final_image__memory_optimize_defaults() {
display_alert "${EXTENSION}" "Disabling zram swap by default" "debug"
sed -i "s/^#\?\s*SWAP=.*/SWAP=false/" "${MOUNT}"/etc/default/armbian-zram-config
# /run is 10% of RAM by default
# systemd throws errors when <16MB is *free* in this partition
# during daemon-reload operations.
# Address with a fixed /run size of ${LOWMEM_TMPFS_RUN_MB}
if ! grep -qE "tmpfs[[:space:]]+/run[[:space:]]+tmpfs" "${MOUNT}/etc/fstab"; then
# Skip if /run entry already exists in fstab (userpatches, etc)
display_alert "${EXTENSION}" "Fixing /run size in /etc/fstab" "debug"
echo "tmpfs /run tmpfs rw,nosuid,nodev,noexec,relatime,size=${LOWMEM_TMPFS_RUN_MB}M,mode=755 0 0" >> "${MOUNT}"/etc/fstab
fi
return 0
}