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d4b6ec980d
The interface requires services to write to the cgroup file to activate notifications,
but with ProtectControlGroups=yes we make it read-only. Add a writable bind mount.
Follow-up for 6bb0084204
60 lines
1.4 KiB
Bash
Executable File
60 lines
1.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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# SPDX-License-Identifier: LGPL-2.1-or-later
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set -ex
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set -o pipefail
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# We not just test if the file exists, but try to read from it, since if
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# CONFIG_PSI_DEFAULT_DISABLED is set in the kernel the file will exist and can
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# be opened, but any read()s will fail with EOPNOTSUPP, which we want to
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# detect.
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if ! cat /proc/pressure/memory >/dev/null ; then
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echo "kernel too old, has no PSI." >&2
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echo OK >/testok
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exit 0
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fi
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systemd-analyze log-level debug
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CGROUP=/sys/fs/cgroup/"$(systemctl show testsuite-79.service -P ControlGroup)"
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test -d "$CGROUP"
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if ! test -f "$CGROUP"/memory.pressure ; then
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echo "No memory accounting/PSI delegated via cgroup, can't test." >&2
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echo OK >/testok
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exit 0
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fi
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UNIT="test-mempress-$RANDOM.service"
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SCRIPT="/tmp/mempress-$RANDOM.sh"
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cat >"$SCRIPT" <<'EOF'
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#!/bin/bash
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set -ex
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export
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id
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test -n "$MEMORY_PRESSURE_WATCH"
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test "$MEMORY_PRESSURE_WATCH" != /dev/null
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test -w "$MEMORY_PRESSURE_WATCH"
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ls -al "$MEMORY_PRESSURE_WATCH"
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EXPECTED="$(echo -n -e "some 123000 2000000\x00" | base64)"
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test "$EXPECTED" = "$MEMORY_PRESSURE_WRITE"
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EOF
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chmod +x "$SCRIPT"
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systemd-run -u "$UNIT" -p Type=exec -p ProtectControlGroups=1 -p DynamicUser=1 -p MemoryPressureWatch=on -p MemoryPressureThresholdSec=123ms -p BindPaths=$SCRIPT --wait "$SCRIPT"
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rm "$SCRIPT"
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systemd-analyze log-level info
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echo OK >/testok
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exit 0
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