Feature added by: Sławomir Lach (Lachu) Feature #320184, revision 1 Title: Session rescue mode openSUSE Distribution: Unconfirmed Priority Requester: Important Requested by: Sławomir Lach (lachu) Partner organization: openSUSE.org Description: There should exist (optional) way to made rescue of user session possible. Systemd-logind should use cgroups to preserve memory for session rescue process(for each session some bulk of memory should been reserved). This memory could be used only by process in specify cgroup, like process manager, window manager and X server. Other idea is to pause any process not belongs to privileged cgroup, to avoid problems with CPU/IO usage, when some keyboard combination was used. Optional idea is to allow use of reserved memory by special keyboard combination(the same, which pauses process). Access to additional memory could been made by special kernel call, but I'm not sure this is necessary. Use Case: Martin have computer with only 2GiB of memory. He wants to run broken sword installer gained from gog.com. System hangs, so he click ctrl+esc, all other processes than window manager, X and process manager pauses and not paused process could allocate additional memory. He selects broken process, kill it and click ctrl+esc to bring session work again. Business case (Partner benefit): openSUSE.org: System could have problems, while a lot of memory are used, so we need to reserve memory for special purposes. -- openSUSE Feature: https://features.opensuse.org/320184