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#!/bin/sh
# https://gist.github.com/phizev/31185a30e7d4984724f1fbbf9c2afe19
echo "Need to read files in /sys/modules/zswap, need root permissions"
ENABLED=$(sudo -A cat /sys/module/zswap/parameters/enabled)
COMPRESSOR=$(sudo -A cat /sys/module/zswap/parameters/compressor)
ZPOOL=$(sudo -A cat /sys/module/zswap/parameters/zpool)
PAGE_SIZE=$(getconf PAGE_SIZE)
STORED_PAGES=$(sudo -A cat /sys/kernel/debug/zswap/stored_pages)
POOL_TOTAL_SIZE=$(sudo -A cat /sys/kernel/debug/zswap/pool_total_size)
POOL_SIZE=$(numfmt --to=iec-i "$POOL_TOTAL_SIZE")
if [ "$POOL_TOTAL_SIZE" = "0" ]
then
DECOMPRESSED_SIZE="N/A"
RATIO="N/A"
else
DECOMPRESSED_SIZE=$(echo "$STORED_PAGES * $PAGE_SIZE" | bc | numfmt --to=iec-i)
RATIO=$(echo "scale=3; $STORED_PAGES * $PAGE_SIZE / $POOL_TOTAL_SIZE" | bc -l)
fi
echo "Zswap enabled: $ENABLED"
echo "Compressor: $COMPRESSOR"
echo "Zpool: $ZPOOL"
echo
echo "Page size: $PAGE_SIZE"
echo "Stored pages: $STORED_PAGES"
echo "Pool size: $POOL_SIZE"
echo "Decompressed size: $DECOMPRESSED_SIZE"
echo "Page compression ratio: $RATIO"
if [ "$1" = "-v" ]
then
echo
grep -R . /sys/kernel/debug/zswap/
grep -R . /sys/module/zswap/parameters/
fi
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