davidedmundson created this revision. Herald added a project: Frameworks. Herald added a subscriber: kde-frameworks-devel. davidedmundson requested review of this revision.
REVISION SUMMARY Having each application in it's own scope brings numerous advantages: - PIDs are very yesteryear, a modern application has a tonne of processes. We want some sort of logical grouping in ksysguard. We have a working version of this. It also can resolve the case of correctly matching the audio indicator to the correct application in the task manager. Something that has been proven to not work reliably by tracking parent PIDs. - We can use the cgroup freezer controller on plasma-mobile to suspend background processes. - We want to put things into the correct slice. Future systemd will split user.slice into 3 subslices, background services, apps and chrome (with chrome being plasmashell and kwin in our case). Putting applications in the correct slice will bring pre-bumped niceness levels. - We also can expose cgroup resources limits - Things get cleaned up logout without relying on xsmp. This is analogous to Gnome's recent change: https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/863/diffs It was also discussed in person at a very-mini meeting at FOSDEM with both systemd and gnome people. Task T12678 <https://phabricator.kde.org/T12678> If a relevant cgroup controller (systemd) is not running, this simply no-ops without issue. In addition things are guarded by an environment variable so we don't introduce any behavioural changes to released Plasma's. ----- This change is incredibly minimal by launching as normal and then tagging afterwards. It's a bit of a chicken and egg scenario as we merge the intended usages of this change. After things are established we will want to move spawning the application to be responsiblity of the cgroup controller as transient services rather than transient scopes. It will be more "technically correct" and allow even more features such as improved logging. TEST PLAN Ran app from kickoff, started systemd-cgls I've been using some variant of this on a private work project for months Also ran against pending ksysguard modifications that showed applications grouped nicely REPOSITORY R241 KIO BRANCH systemd_start REVISION DETAIL https://phabricator.kde.org/D27883 AFFECTED FILES src/widgets/kprocessrunner.cpp src/widgets/kprocessrunner_p.h To: davidedmundson Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns
