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Make swap size configurable (#3882)

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Allow configuration of the swap size via /etc/default/haos-swapfile file. By
setting the SWAPSIZE variable in this file, swapfile get recreated on the next
reboot to the defined size. Size can be either in bytes or with optional units
(B/K/M/G, accepting some variations but always interpreted as power of 10). The
size is then rounded to 4k block size. If no override is defined or the value
can't be parsed, it falls back to previously used 33% of system RAM.

Fixes #968
This commit is contained in:
Jan Čermák
2025-02-19 15:33:04 +01:00
committed by GitHub
parent dc7b693691
commit d42e34f646
6 changed files with 89 additions and 15 deletions
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61
buildroot-external/rootfs-overlay/usr/libexec/haos-swapfile
View File

@@ -1,24 +1,59 @@
#!/bin/sh
set -e
swapfile="/mnt/data/swapfile"
size2kilobytes() {
bytes="$(echo "$1" | awk \
'BEGIN{IGNORECASE = 1}
function tobytes(n,b,p) {printf "%u\n", n*b^p/1024}
/[0-9]B?$/{tobytes($1, 1, 0); next};
/K(i?B)?$/{tobytes($1, 2, 10); next};
/M(i?B)?$/{tobytes($1, 2, 20); next};
/G(i?B)?$/{tobytes($1, 2, 30); next};
{print -1}')"
echo "$bytes"
}
if [ -f /etc/default/haos-swapfile ]; then
# shellcheck disable=SC1091
. /etc/default/haos-swapfile
fi
SWAPFILE="/mnt/data/swapfile"
# Swap size in kilobytes (as it's also what meminfo shows)
SWAPSIZE="$(size2kilobytes "${SWAPSIZE}")"
if [ -z "${SWAPSIZE}" ] || [ "${SWAPSIZE}" = "-1" ]; then
# Default to 33% of total memory
SWAPSIZE="$(awk '/MemTotal/{ print int($2 * 0.33) }' /proc/meminfo)"
echo "[INFO] Using default swapsize of 33% RAM (${SWAPSIZE} kB)"
fi
# Swap space in 4k blocks
swapsize="$(awk '/MemTotal/{ print int($2 * 0.33 / 4) }' /proc/meminfo)"
SWAPSIZE_BLOCKS=$((SWAPSIZE / 4))
if [ "${SWAPSIZE_BLOCKS}" -lt 10 ]; then
echo "[INFO] Requested swap size smaller than 40kB, disabling swap"
if [ ! -s "${swapfile}" ] || [ "$(stat "${swapfile}" -c '%s')" -lt $((swapsize * 4096)) ]; then
# Check free space (in 4k blocks)
if [ "$(stat -f /mnt/data -c '%f')" -lt "${swapsize}" ]; then
echo "[WARNING] Not enough space to allocate swapfile"
exit 1
fi
if [ -f "${SWAPFILE}" ]; then
echo "[INFO] Removing existing swapfile"
rm -f "${SWAPFILE}"
fi
echo "[INFO] Creating swapfile of size $((swapsize *4))k"
umask 0077
dd if=/dev/zero of="${swapfile}" bs=4k count="${swapsize}"
exit 0
fi
if ! swaplabel "${swapfile}" > /dev/null 2>&1; then
/usr/lib/systemd/systemd-makefs swap "${swapfile}"
if [ ! -s "${SWAPFILE}" ] || [ "$(stat "${SWAPFILE}" -c '%s')" -ne $((SWAPSIZE_BLOCKS * 4096)) ]; then
# Check free space (in 4k blocks)
if [ "$(stat -f /mnt/data -c '%f')" -lt "${SWAPSIZE_BLOCKS}" ]; then
echo "[ERROR] Not enough space to allocate swapfile"
exit 1
fi
echo "[INFO] Creating swapfile of size ${SWAPSIZE} kB (rounded to ${SWAPSIZE_BLOCKS} blocks)"
umask 0077
dd if=/dev/zero of="${SWAPFILE}" bs=4k count="${SWAPSIZE_BLOCKS}"
fi
if ! swaplabel "${SWAPFILE}" > /dev/null 2>&1; then
/usr/lib/systemd/systemd-makefs swap "${SWAPFILE}"
fi