I'm using Armbian bullseye on an Odroid HC2 with 2 GB of RAM with OpenMediaVault. Its memory usage used to be around 10% before starting any docker services, and a cool 50-60% while running things like Nextcloud, Vaultwarden etc. It used to jump to around 80% when some headless Chromium processes ran intermittently, but overall, it's been quite stable.
I don't recall to make any significant changes to the system, yet suddenly the baseline memory usage jumped to around 50%, making my system extremely slow and unstable, with service and system restarts now occuring several times a day. I couldn't extract any useful clue about what's using all that RAM, with `systemd-cgtop -m` showing system.slice using half my memory, without any services therein apparently making up that amount.
Unfortunately, I can't make comparisons of `/proc/meminfo`, output of `free` or any other method relative to the before-state, because I obviously haven't monitored these until it became an issue, and now I can't restore the normal state.
How would I go about addressing this problem?
