User:Eliasp/Drafts/Plasma Workspace as systemd user-session: Difference between revisions

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    * Increased security
    * Increased security
    * Greatly improved logging by using systemd's [http://www.freedesktop.org/software/systemd/man/systemd-journald.service.html journald] - goodbye horrible piece of log-target called ''~/.xsession-errors''
    * Greatly improved logging by using systemd's [http://www.freedesktop.org/software/systemd/man/systemd-journald.service.html journald] - goodbye horrible piece of log-target called ''~/.xsession-errors''
    * Better control over system resources (e.g. ensure GUI elements are always responsive) via systemd's builtin [http://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/ cgroup control interface]
    * Better control over system resources/process priorities (e.g. ensure GUI elements are always responsive) via systemd's builtin [http://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/ cgroup control interface]


    == Resources ==
    == Resources ==

    Revision as of 05:31, 18 June 2014

    Plasma Workspace as systemd user-session

    Ultimate Goal

    The ultimate goal of this project is, to make use of systemd's support for user-sessions wherever possible for running a Plasma Workspace. This support is to be implemented in a way which doesn't get in the way of legacy/cross-platform support, so running a Plasma Workspace without a systemd user-session underneath will still be possible.

    What are the benefits?

    • Parallelized and faster startup of the Plasma Workspace after login
    • More finegrained control over running services
    • Increased stability by eliminating existing hacks in startkde, ksmserver, kdeinit, …
    • Cleaner definition of dependencies between Plasma Workspace components
    • Increased security
    • Greatly improved logging by using systemd's journald - goodbye horrible piece of log-target called ~/.xsession-errors
    • Better control over system resources/process priorities (e.g. ensure GUI elements are always responsive) via systemd's builtin cgroup control interface

    Resources

    user-session units for Plasma Workspace

    I created some initial user-session units for Plasma Workspace which can be found on GitHub.

    Unsorted items

    This is a collection of items, notes and other things which need to be taken care of. They need to be investigated and properly documented.

    ksmserver

    ksmserver does a lot of ugly (from systemd's perspective) things which need to be evaluated:

    • tries to start a WM in ksmserver/startup.cpp → launchWM which should be left to systemd
    • doesn't register itself as session leader via systemd-logind which breaks a lot of session related functionality. Documented in bug#335390

    ksplashqml

    Relies on a serial startup of the components, but isn't able to deal with a parallelized startup. If the final result is a really fast startup, a splash screen might be not needed anymore. If the startup still takes "enough" time to show a splash screen, ksplashqml needs to be reworked to be able to deal with a parallelized startup.