---
name: "org.freedesktop.oom1"
section: "5"
platform: "linux"
package: "systemd"
version: "262.1-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/org.freedesktop.oom1"
---

# org.freedesktop.oom1(5)

The D-Bus interface of systemd-oomd

## NAME

org.freedesktop.oom1 - The D-Bus interface of systemd-oomd

## INTRODUCTION

[**systemd-oomd.service**(8)](/systemd-oomd.service/8.md) is a system service which implements a userspace out-of-memory (OOM) killer. This page describes the D-Bus interface.

## THE MANAGER OBJECT

The service exposes the following interfaces on the Manager object on the bus:

```
node /org/freedesktop/oom1 {
  interface org.freedesktop.oom1.Manager {
    methods:
      DumpByFileDescriptor(out h fd);
    signals:
      Killed(s cgroup,
             s reason);
  };
  interface org.freedesktop.DBus.Peer { ... };
  interface org.freedesktop.DBus.Introspectable { ... };
  interface org.freedesktop.DBus.Properties { ... };
};
```

### Methods

**Killed()** signal is sent when any cgroup is killed by oomd.

Note that more reasons will be added in the future, and the table below will be expanded accordingly.

**Table 1. Killing reasons**

| | |
| --- | --- |
| **Reason** | **Description** |
| memory-used | Application took too much memory and swap. |
| memory-pressure | Application took enough memory and swap to cause sufficient slowdown of other applications. |

## VERSIONING

These D-Bus interfaces follow **the usual interface versioning guidelines**\[1\].

## HISTORY

### The Manager Object

**Killed()** was added in version 252.

## SEE ALSO

[**systemd**(1)](/systemd/1.md), [**systemd-oomd.service**(8)](/systemd-oomd.service/8.md), [**oomctl**(1)](/oomctl/1.md)

## NOTES

- 1\.

  the usual interface versioning guidelines

  https://0pointer.de/blog/projects/versioning-dbus.html