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nixos/tests/systemd-oomd: fix and follows upstream tests

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The current test triggers the kernel OOM killer and doesn't work well.
This commit is contained in:
oxalica 2022-10-06 09:42:33 +08:00
parent 7002a54979
commit 9fca212c84
1 changed files with 38 additions and 21 deletions
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59
nixos/tests/systemd-oomd.nix
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@ -3,35 +3,52 @@ import ./make-test-python.nix ({ pkgs, ... }:
{
name = "systemd-oomd";
# This test is a simplified version of systemd's testsuite-55.
# https://github.com/systemd/systemd/blob/v251/test/units/testsuite-55.sh
nodes.machine = { pkgs, ... }: {
systemd.oomd.extraConfig.DefaultMemoryPressureDurationSec = "1s"; # makes the test faster
# Kill cgroups when more than 1% pressure is encountered
systemd.slices."-".sliceConfig = {
ManagedOOMMemoryPressure = "kill";
ManagedOOMMemoryPressureLimit = "1%";
};
# A service to bring the system under memory pressure
systemd.services.testservice = {
serviceConfig.ExecStart = "${pkgs.coreutils}/bin/tail /dev/zero";
};
# Do not kill the backdoor
systemd.services.backdoor.serviceConfig.ManagedOOMMemoryPressure = "auto";
# Limit VM resource usage.
virtualisation.memorySize = 1024;
systemd.oomd.extraConfig.DefaultMemoryPressureDurationSec = "1s";
systemd.slices.workload = {
description = "Test slice for memory pressure kills";
sliceConfig = {
MemoryAccounting = true;
ManagedOOMMemoryPressure = "kill";
ManagedOOMMemoryPressureLimit = "10%";
};
};
systemd.services.testbloat = {
description = "Create a lot of memory pressure";
serviceConfig = {
Slice = "workload.slice";
MemoryHigh = "5M";
ExecStart = "${pkgs.coreutils}/bin/tail /dev/zero";
};
};
systemd.services.testchill = {
description = "No memory pressure";
serviceConfig = {
Slice = "workload.slice";
MemoryHigh = "3M";
ExecStart = "${pkgs.coreutils}/bin/sleep infinity";
};
};
};
testScript = ''
# Start the system
# Start the system.
machine.wait_for_unit("multi-user.target")
machine.succeed("oomctl")
# Bring the system into memory pressure
machine.succeed("echo 0 > /proc/sys/vm/panic_on_oom") # NixOS tests kill the VM when the OOM killer is invoked - override this
machine.succeed("systemctl start testservice")
machine.succeed("systemctl start testchill.service")
with subtest("OOMd should kill the bad service"):
machine.fail("systemctl start --wait testbloat.service")
assert machine.get_unit_info("testbloat.service")["Result"] == "oom-kill"
# Wait for oomd to kill something
# Matches these lines:
# systemd-oomd[508]: Killed /system.slice/systemd-udevd.service due to memory pressure for / being 3.26% > 1.00% for > 1s with reclaim activity
machine.wait_until_succeeds("journalctl -b | grep -q 'due to memory pressure for'")
with subtest("Service without memory pressure should be untouched"):
machine.require_unit_state("testchill.service", "active")
'';
})