Summary: This brings numerous advantages such as:
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easier admin configuration with drop-ins, overrides and multiple hooks throughout (and only having to learn one tool)
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session cleanup on exit, avoiding that occasional part where shutdown hangs
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startup that actually knows when things are up
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race free autostart and DBus activation at once
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logs that rotate are split by service and usable
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resource management through slices and cgroups
Over the past 2 years I've been trying to tidy up and encapsulate the relevant parts of startup into the binary plasma-session so that we can just runtime swap out that one part and supporting both paths will be easy.
Support is toggleable via a configuration option. The default is currently completely off. Then we can change after some feedback.
Task T11914
From Differential Revision: https://phabricator.kde.org/D28305