[tychver]

I would also say the same if you host a Ruby or Python app, or anything using forking really.

Similar to the issues you had with Redis, the kernel change to THP on by default totally destroyed CoW sharing for forked Ruby processes, despite Koichi Sasada's change to make the GC more CoW friendly. Without disabling THP, a single run of GC marking can cause the entire heap to be copied for the child.