nixpkgs/nixos/tests/systemd-oomd.nix

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import ./make-test-python.nix ({ pkgs, ... }:
{
name = "systemd-oomd";
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";
virtualisation.memorySize = 1024;
};
testScript = ''
# 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")
# 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'")
'';
})