[systemd-devel] [RFC] core: introduce ExitOnIdle= and ExitOnIdleSec=

[WaLyong Cho]

On 04/21/2015 12:10 AM, Lennart Poettering wrote:
> On Mon, 20.04.15 23:56, WaLyong Cho (walyong.cho at samsung.com) wrote:
> 
>> If a service does not consume CPU during some time(can be configured
>> by ExitOnIdleSec=) and set to stopped on idle state(ExitOnIdle=), the
>> service will be stopped. This can be useful if the service provides
>> some of activation methods.
> 
> Hmm, I am not convinced this would be a good idea, sorry.
> 
> The crux of the issue is that it is really hard to detect from the
> outside if a daemon is really idle. Only the daemon itself knows
> whether it is truly idle or not. I mean, it could just be waiting for
> some timer to elapse, or some other external event.
> 
> I doubt this is really useful unless you have really really simple
> daemons that purely react on client requests and nothing else, and you
> know the codebase and that it is OK to terminate the daemon just
> because its CPU usage is zero. But if you know the codebase that well
> it would probably be a better idea to just add support for
> exit-on-idle directly to the daemon in question.

That's why I sent with [RFC] prefix. :)

Thanks for reply.

WaLyong