mirror of
https://github.com/home-assistant/operating-system.git
synced 2026-05-03 23:18:02 +01:00
57445099f7
As the reported MemTotal can fluctuate a bit on some systems, e.g. because the reserved memory changes between kernel version or other factors affect it like VRAM, the swap file can be recreated unnecessarily between boots. Allow for some fluctuation (up to +-32MB) before the swapfile is recreated. This was a problem already before the recent haos-swapfile changes, however, before it checked if the existing swapfile isn't smaller than the desired value. If the MemTotal fluctuated there, the swapfile size eventually settled on the highest value seen and it wasn't recreated anymore. With this change, things should be stable even more.
67 lines
2.1 KiB
Bash
Executable File
67 lines
2.1 KiB
Bash
Executable File
#!/bin/sh
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set -e
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size2kilobytes() {
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bytes="$(echo "$1" | awk \
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'BEGIN{IGNORECASE = 1}
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function tobytes(n,b,p) {printf "%u\n", n*b^p/1024}
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/[0-9]B?$/{tobytes($1, 1, 0); next};
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/K(i?B)?$/{tobytes($1, 2, 10); next};
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/M(i?B)?$/{tobytes($1, 2, 20); next};
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/G(i?B)?$/{tobytes($1, 2, 30); next};
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{print -1}')"
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echo "$bytes"
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}
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if [ -f /etc/default/haos-swapfile ]; then
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# shellcheck disable=SC1091
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. /etc/default/haos-swapfile
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fi
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SWAPFILE="/mnt/data/swapfile"
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# Swap size in kilobytes (as it's also what meminfo shows)
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SWAPSIZE="$(size2kilobytes "${SWAPSIZE}")"
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SWAPSIZE_TOLERANCE=0
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if [ -z "${SWAPSIZE}" ] || [ "${SWAPSIZE}" = "-1" ]; then
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# Default to 33% of total memory
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SWAPSIZE="$(awk '/MemTotal/{ print int($2 * 0.33) }' /proc/meminfo)"
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echo "[INFO] Using default swapsize of 33% RAM (${SWAPSIZE} kB)"
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SWAPSIZE_TOLERANCE=$((32*1024)) # allow for 32MB fluctuations
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fi
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# Swap space in 4k blocks
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SWAPSIZE_BLOCKS=$((SWAPSIZE / 4))
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if [ "${SWAPSIZE_BLOCKS}" -lt 10 ]; then
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echo "[INFO] Requested swap size smaller than 40kB, disabling swap"
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if [ -f "${SWAPFILE}" ]; then
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echo "[INFO] Removing existing swapfile"
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rm -f "${SWAPFILE}"
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fi
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exit 0
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fi
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CURRENT_SIZE="$([ -f "${SWAPFILE}" ] && stat "${SWAPFILE}" -c '%s' || echo 0)"
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if [ -s "${SWAPFILE}" ] && [ "${CURRENT_SIZE}" -ge $(((SWAPSIZE - SWAPSIZE_TOLERANCE) * 1024)) ] \
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&& [ "${CURRENT_SIZE}" -le $(((SWAPSIZE + SWAPSIZE_TOLERANCE) * 1024)) ]; then
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echo "[INFO] Swapfile already exists with size ${CURRENT_SIZE} bytes"
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elif [ ! -s "${SWAPFILE}" ] || [ "${CURRENT_SIZE}" -ne $((SWAPSIZE_BLOCKS * 4096)) ]; then
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# Check free space (in 4k blocks)
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if [ "$(stat -f /mnt/data -c '%f')" -lt "${SWAPSIZE_BLOCKS}" ]; then
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echo "[ERROR] Not enough space to allocate swapfile"
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exit 1
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fi
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echo "[INFO] Creating swapfile of size ${SWAPSIZE} kB (rounded to ${SWAPSIZE_BLOCKS} blocks)"
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umask 0077
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dd if=/dev/zero of="${SWAPFILE}" bs=4k count="${SWAPSIZE_BLOCKS}"
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fi
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if ! swaplabel "${SWAPFILE}" > /dev/null 2>&1; then
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/usr/lib/systemd/systemd-makefs swap "${SWAPFILE}"
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fi
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