test: add test case for new OOM logic

test/TEST-31-OOMPOLICY/Makefile

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+../TEST-01-BASIC/Makefile

test/TEST-31-OOMPOLICY/test.sh

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+#!/bin/bash
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+set -e
+TEST_DESCRIPTION="test OOM killer logic"
+TEST_NO_NSPAWN=1
+
+. $TEST_BASE_DIR/test-functions
+
+UNIFIED_CGROUP_HIERARCHY=yes
+
+test_setup() {
+    create_empty_image
+    mkdir -p $TESTDIR/root
+    mount ${LOOPDEV}p1 $TESTDIR/root
+
+    (
+        LOG_LEVEL=5
+        eval $(udevadm info --export --query=env --name=${LOOPDEV}p2)
+
+        setup_basic_environment
+
+        # mask some services that we do not want to run in these tests
+        ln -fs /dev/null $initdir/etc/systemd/system/systemd-hwdb-update.service
+        ln -fs /dev/null $initdir/etc/systemd/system/systemd-journal-catalog-update.service
+        ln -fs /dev/null $initdir/etc/systemd/system/systemd-networkd.service
+        ln -fs /dev/null $initdir/etc/systemd/system/systemd-networkd.socket
+        ln -fs /dev/null $initdir/etc/systemd/system/systemd-resolved.service
+        ln -fs /dev/null $initdir/etc/systemd/system/systemd-machined.service
+
+        # setup the testsuite service
+        cat >$initdir/etc/systemd/system/testsuite.service <<EOF
+[Unit]
+Description=Testsuite service
+
+[Service]
+ExecStart=/testsuite.sh
+Type=oneshot
+StandardOutput=tty
+StandardError=tty
+MemoryAccounting=yes
+EOF
+        cp testsuite.sh $initdir/
+
+        setup_testsuite
+    ) || return 1
+
+    ddebug "umount $TESTDIR/root"
+    umount $TESTDIR/root
+}
+
+do_test "$@"

test/TEST-31-OOMPOLICY/testsuite.sh

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+#!/bin/bash
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+set -ex
+set -o pipefail
+
+# Let's run this test only if the "memory.oom.group" cgroupfs attribute
+# exists. This test is a bit too strict, since the "memory.events"/"oom_kill"
+# logic has been around since a longer time than "memory.oom.group", but it's
+# an easier thing to test for, and also: let's not get confused by older
+# kernels where the concept was still new.
+
+if test -f /sys/fs/cgroup/system.slice/testsuite.service/memory.oom.group ; then
+
+    systemd-analyze log-level debug
+    systemd-analyze log-target console
+
+    # Run a service that is guaranteed to be the first candidate for OOM killing
+    systemd-run --unit=oomtest.service -p Type=exec -p OOMScoreAdjust=1000 -p OOMPolicy=stop -p MemoryAccounting=yes /bin/sleep infinity
+
+    # Trigger an OOM killer run
+    echo 1 > /proc/sys/kernel/sysrq
+    echo f > /proc/sysrq-trigger
+
+    while : ; do
+        STATE=`systemctl show -p ActiveState --value oomtest.service`
+        [ "$STATE" = "failed" ] && break
+        sleep .5
+    done
+
+    RESULT=`systemctl show -p Result --value oomtest.service`
+    test "$RESULT" = "oom-kill"
+
+    systemd-analyze log-level info
+fi
+
+echo OK > /testok
+
+exit 0