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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
if [ $EUID -ne 0 ]
then
echo "Run as root"
exit $ksft_skip
fi
damon_sysfs="/sys/kernel/mm/damon/admin"
if [ ! -d "$damon_sysfs" ]
then
echo "damon sysfs not found"
exit $ksft_skip
fi
# ensure filter directory
echo 1 > "$damon_sysfs/kdamonds/nr_kdamonds"
echo 1 > "$damon_sysfs/kdamonds/0/contexts/nr_contexts"
echo 1 > "$damon_sysfs/kdamonds/0/contexts/0/schemes/nr_schemes"
echo 1 > "$damon_sysfs/kdamonds/0/contexts/0/schemes/0/filters/nr_filters"
filter_dir="$damon_sysfs/kdamonds/0/contexts/0/schemes/0/filters/0"
before_kb=$(grep Slab /proc/meminfo | awk '{print $2}')
# try to leak 3000 KiB
for i in {1..102400};
do
echo "012345678901234567890123456789" > "$filter_dir/memcg_path"
done
after_kb=$(grep Slab /proc/meminfo | awk '{print $2}')
# expect up to 1500 KiB free from other tasks memory
expected_after_kb_max=$((before_kb + 1500))
if [ "$after_kb" -gt "$expected_after_kb_max" ]
then
echo "maybe memcg_path are leaking: $before_kb -> $after_kb"
exit 1
else
exit 0
fi
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