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Allow for fluctuation of MemTotal for automatic swapfile size #4016

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Merged
sairon merged 1 commit into from
Apr 10, 2025
Merged

Allow for fluctuation of MemTotal for automatic swapfile size #4016

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9 changes: 8 additions & 1 deletion buildroot-external/rootfs-overlay/usr/libexec/haos-swapfile
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Original file line number Diff line number Diff line change
Expand Up @@ -21,11 +21,13 @@ SWAPFILE="/mnt/data/swapfile"

# Swap size in kilobytes (as it's also what meminfo shows)
SWAPSIZE="$(size2kilobytes "${SWAPSIZE}")"
SWAPSIZE_TOLERANCE=0

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)"
SWAPSIZE_TOLERANCE=$((32*1024)) # allow for 32MB fluctuations
fi

# Swap space in 4k blocks
Expand All @@ -42,7 +44,12 @@ if [ "${SWAPSIZE_BLOCKS}" -lt 10 ]; then
exit 0
fi

if [ ! -s "${SWAPFILE}" ] || [ "$(stat "${SWAPFILE}" -c '%s')" -ne $((SWAPSIZE_BLOCKS * 4096)) ]; then
CURRENT_SIZE="$([ -f "${SWAPFILE}" ] && stat "${SWAPFILE}" -c '%s' || echo 0)"

if [ -s "${SWAPFILE}" ] && [ "${CURRENT_SIZE}" -ge $(((SWAPSIZE - SWAPSIZE_TOLERANCE) * 1024)) ] \
&& [ "${CURRENT_SIZE}" -le $(((SWAPSIZE + SWAPSIZE_TOLERANCE) * 1024)) ]; then
echo "[INFO] Swapfile already exists with size ${CURRENT_SIZE} bytes"
elif [ ! -s "${SWAPFILE}" ] || [ "${CURRENT_SIZE}" -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"
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