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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
set -e
if [[ $(id -u) -ne 0 ]]; then
echo "This test must be run as root. Skipping..."
exit $ksft_skip
fi
nr_hugepgs=$(cat /proc/sys/vm/nr_hugepages)
usage_file=usage_in_bytes
if [[ "$1" == "-cgroup-v2" ]]; then
cgroup2=1
usage_file=current
fi
if [[ $cgroup2 ]]; then
CGROUP_ROOT=$(mount -t cgroup2 | head -1 | awk '{print $3}')
if [[ -z "$CGROUP_ROOT" ]]; then
CGROUP_ROOT=$(mktemp -d)
mount -t cgroup2 none $CGROUP_ROOT
do_umount=1
fi
echo "+hugetlb +memory" >$CGROUP_ROOT/cgroup.subtree_control
else
CGROUP_ROOT=$(mount -t cgroup | grep ",hugetlb" | awk '{print $3}')
if [[ -z "$CGROUP_ROOT" ]]; then
CGROUP_ROOT=/dev/cgroup/memory
mount -t cgroup memory,hugetlb $CGROUP_ROOT
do_umount=1
fi
fi
MNT='/mnt/huge'
function get_machine_hugepage_size() {
hpz=$(grep -i hugepagesize /proc/meminfo)
kb=${hpz:14:-3}
mb=$(($kb / 1024))
echo $mb
}
MB=$(get_machine_hugepage_size)
function cleanup() {
echo cleanup
set +e
rm -rf "$MNT"/* 2>/dev/null
umount "$MNT" 2>/dev/null
rmdir "$MNT" 2>/dev/null
rmdir "$CGROUP_ROOT"/a/b 2>/dev/null
rmdir "$CGROUP_ROOT"/a 2>/dev/null
rmdir "$CGROUP_ROOT"/test1 2>/dev/null
echo $nr_hugepgs >/proc/sys/vm/nr_hugepages
set -e
}
function assert_with_retry() {
local actual_path="$1"
local expected="$2"
local tolerance=$((7 * 1024 * 1024))
local timeout=20
local interval=1
local start_time
local now
local elapsed
local actual
start_time=$(date +%s)
while true; do
actual="$(cat "$actual_path")"
if [[ $actual -ge $(($expected - $tolerance)) ]] &&
[[ $actual -le $(($expected + $tolerance)) ]]; then
return 0
fi
now=$(date +%s)
elapsed=$((now - start_time))
if [[ $elapsed -ge $timeout ]]; then
echo "actual = $((${actual%% *} / 1024 / 1024)) MB"
echo "expected = $((${expected%% *} / 1024 / 1024)) MB"
cleanup
exit 1
fi
sleep $interval
done
}
function assert_state() {
local expected_a="$1"
local expected_a_hugetlb="$2"
local expected_b=""
local expected_b_hugetlb=""
if [ ! -z ${3:-} ] && [ ! -z ${4:-} ]; then
expected_b="$3"
expected_b_hugetlb="$4"
fi
assert_with_retry "$CGROUP_ROOT/a/memory.$usage_file" "$expected_a"
assert_with_retry "$CGROUP_ROOT/a/hugetlb.${MB}MB.$usage_file" "$expected_a_hugetlb"
if [[ -n "$expected_b" && -n "$expected_b_hugetlb" ]]; then
assert_with_retry "$CGROUP_ROOT/a/b/memory.$usage_file" "$expected_b"
assert_with_retry "$CGROUP_ROOT/a/b/hugetlb.${MB}MB.$usage_file" "$expected_b_hugetlb"
fi
}
function setup() {
echo 100 >/proc/sys/vm/nr_hugepages
mkdir "$CGROUP_ROOT"/a
sleep 1
if [[ $cgroup2 ]]; then
echo "+hugetlb +memory" >$CGROUP_ROOT/a/cgroup.subtree_control
else
echo 0 >$CGROUP_ROOT/a/cpuset.mems
echo 0 >$CGROUP_ROOT/a/cpuset.cpus
fi
mkdir "$CGROUP_ROOT"/a/b
if [[ ! $cgroup2 ]]; then
echo 0 >$CGROUP_ROOT/a/b/cpuset.mems
echo 0 >$CGROUP_ROOT/a/b/cpuset.cpus
fi
mkdir -p "$MNT"
mount -t hugetlbfs none "$MNT"
}
write_hugetlbfs() {
local cgroup="$1"
local path="$2"
local size="$3"
if [[ $cgroup2 ]]; then
echo $$ >$CGROUP_ROOT/$cgroup/cgroup.procs
else
echo 0 >$CGROUP_ROOT/$cgroup/cpuset.mems
echo 0 >$CGROUP_ROOT/$cgroup/cpuset.cpus
echo $$ >"$CGROUP_ROOT/$cgroup/tasks"
fi
./write_to_hugetlbfs -p "$path" -s "$size" -m 0 -o
if [[ $cgroup2 ]]; then
echo $$ >$CGROUP_ROOT/cgroup.procs
else
echo $$ >"$CGROUP_ROOT/tasks"
fi
echo
}
set -e
size=$((${MB} * 1024 * 1024 * 25)) # 50MB = 25 * 2MB hugepages.
cleanup
echo
echo Test charge, rmdir, uncharge
setup
echo mkdir
mkdir $CGROUP_ROOT/test1
echo write
write_hugetlbfs test1 "$MNT"/test $size
echo rmdir
rmdir $CGROUP_ROOT/test1
mkdir $CGROUP_ROOT/test1
echo uncharge
rm -rf /mnt/huge/*
cleanup
echo done
echo
if [[ ! $cgroup2 ]]; then
echo "Test parent and child hugetlb usage"
setup
echo write
write_hugetlbfs a "$MNT"/test $size
echo Assert memory charged correctly for parent use.
assert_state 0 $size 0 0
write_hugetlbfs a/b "$MNT"/test2 $size
echo Assert memory charged correctly for child use.
assert_state 0 $(($size * 2)) 0 $size
rmdir "$CGROUP_ROOT"/a/b
echo Assert memory reparent correctly.
assert_state 0 $(($size * 2))
rm -rf "$MNT"/*
umount "$MNT"
echo Assert memory uncharged correctly.
assert_state 0 0
cleanup
fi
echo
echo "Test child only hugetlb usage"
echo setup
setup
echo write
write_hugetlbfs a/b "$MNT"/test2 $size
echo Assert memory charged correctly for child only use.
assert_state 0 $(($size)) 0 $size
rmdir "$CGROUP_ROOT"/a/b
echo Assert memory reparent correctly.
assert_state 0 $size
rm -rf "$MNT"/*
umount "$MNT"
echo Assert memory uncharged correctly.
assert_state 0 0
cleanup
echo ALL PASS
if [[ $do_umount ]]; then
umount $CGROUP_ROOT
rm -rf $CGROUP_ROOT
fi
echo "$nr_hugepgs" > /proc/sys/vm/nr_hugepages
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