Bus statistics - org.freedesktop.DBus.Debug.Stats

Umut Tezduyar Lindskog umut at tezduyar.com
Wed Jun 24 01:55:15 PDT 2015

Has there been any discussion to have the statistics interface on the
client and let it up to client libraries to fill out the statistics?
For example, just like org.freedesktop.DBus.Introspect having an
interface like org.freedesktop.DBus.Stats.


On Tue, Jun 23, 2015 at 11:51 AM, Simon McVittie
<simon.mcvittie at collabora.co.uk> wrote:
> On 23/06/15 07:12, Umut Tezduyar Lindskog wrote:
>> I have found the promising interface
>> "org.freedesktop.DBus.Debug.Stats" but the interface is not mentioned
>> in dbus spec.
> I consider this interface to be an implementation detail of the
> reference dbus-daemon. You can use it to gather statistics from
> dbus-daemon, if you know you have a new enough version compiled with
> --enable-stats. However, you cannot rely on third-party
> reimplementations (or old or minimal installations of dbus-daemon)
> having this interface.
> If you want to add extra properties or methods to that interface, please
> send patches to the usual place (freedesktop.org Bugzilla). I'm happy to
> add anything that has a low runtime cost (in terms of CPU, memory and
> lines-of-code) - counting bytes would be fine, for instance. Anything
> "expensive" should be a separate --enable option.
>> Is this interface meant to be officially supported so we
>> can have it in kdbus too?
> Interfaces on o.fd.DBus are unlikely to ever be implemented in kdbus,
> because the closest equivalent of dbus-daemon in kdbus is a kernel
> module. The way to get analogous statistics and debug information out of
> kdbus would be a special ioctl or a file in /sys.
>> Can someone explain it a bit more, or point to a document that explains it?
> At the moment, the source code is the documentation. If you are not
> comfortable with finding things in the dbus source code, this interface
> is probably not for you (but I'd be willing to review a patch to add
> documentation to a text or Docbook file in the doc directory).
> I do not think this interface should be documented in the D-Bus
> Specification. It is not part of the interoperable subset of D-Bus; I
> don't expect systemd-bus-proxy, gdbus-daemon or dbus-sharp's managed
> dbus-daemon to ever implement it, for instance.
> --
> Simon McVittie
> Collabora Ltd. <http://www.collabora.com/>
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