commit 9fca212c84c12b55cfc4caf94f434a808daebdb3 · pyrox.dev/nixpkgs

+36 -19
nixos/tests/systemd-oomd.nix
···

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       {

     

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         name = "systemd-oomd";

     

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         # This test is a simplified version of systemd's testsuite-55.

     

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         # https://github.com/systemd/systemd/blob/v251/test/units/testsuite-55.sh

     

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         nodes.machine = { pkgs, ... }: {

     

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           systemd.oomd.extraConfig.DefaultMemoryPressureDurationSec = "1s"; # makes the test faster

     

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           # Kill cgroups when more than 1% pressure is encountered

     

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           systemd.slices."-".sliceConfig = {

     

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             ManagedOOMMemoryPressure = "kill";

     

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             ManagedOOMMemoryPressureLimit = "1%";

     

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           # Limit VM resource usage.

     

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           virtualisation.memorySize = 1024;

     

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           systemd.oomd.extraConfig.DefaultMemoryPressureDurationSec = "1s";

     

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           systemd.slices.workload = {

     

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             description = "Test slice for memory pressure kills";

     

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             sliceConfig = {

     

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               MemoryAccounting = true;

     

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               ManagedOOMMemoryPressure = "kill";

     

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               ManagedOOMMemoryPressureLimit = "10%";

     

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             };

     

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           };

     

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           # A service to bring the system under memory pressure

     

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           systemd.services.testservice = {

     

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             serviceConfig.ExecStart = "${pkgs.coreutils}/bin/tail /dev/zero";

     

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           systemd.services.testbloat = {

     

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             description = "Create a lot of memory pressure";

     

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             serviceConfig = {

     

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               Slice = "workload.slice";

     

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               MemoryHigh = "5M";

     

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               ExecStart = "${pkgs.coreutils}/bin/tail /dev/zero";

     

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             };

     

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           };

     

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           # Do not kill the backdoor

     

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           systemd.services.backdoor.serviceConfig.ManagedOOMMemoryPressure = "auto";

     

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           virtualisation.memorySize = 1024;

     

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           systemd.services.testchill = {

     

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             description = "No memory pressure";

     

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             serviceConfig = {

     

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               Slice = "workload.slice";

     

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               MemoryHigh = "3M";

     

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               ExecStart = "${pkgs.coreutils}/bin/sleep infinity";

     

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             };

     

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           };

     

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         };

     

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         testScript = ''

     

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           # Start the system

     

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           # Start the system.

     

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           machine.wait_for_unit("multi-user.target")

     

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           machine.succeed("oomctl")

     

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           # Bring the system into memory pressure

     

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           machine.succeed("echo 0 > /proc/sys/vm/panic_on_oom")  # NixOS tests kill the VM when the OOM killer is invoked - override this

     

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           machine.succeed("systemctl start testservice")

     

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           machine.succeed("systemctl start testchill.service")

     

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           with subtest("OOMd should kill the bad service"):

     

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               machine.fail("systemctl start --wait testbloat.service")

     

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               assert machine.get_unit_info("testbloat.service")["Result"] == "oom-kill"

     

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           # Wait for oomd to kill something

     

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           # Matches these lines:

     

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           # systemd-oomd[508]: Killed /system.slice/systemd-udevd.service due to memory pressure for / being 3.26% > 1.00% for > 1s with reclaim activity

     

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           machine.wait_until_succeeds("journalctl -b | grep -q 'due to memory pressure for'")

     

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           with subtest("Service without memory pressure should be untouched"):

     

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               machine.require_unit_state("testchill.service", "active")

     

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         '';

     

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       })