I've bisected systemd and found the commit that triggers the bug.
http://bazaar.launchpad.net/~thopiekar/systemd/systemd-packaging-ubuntu-
wily/revision/1706 seems to be the one. The commit is a bugfix that
effectively enables hotadd for Xen. That can explain why more or less
only Ubuntu 15.10 is affected, but the underlying mechanism is in the
kernel.
A working workaround on the latest 15.10 is to comment out line 2
(ATTR{[dmi/id]sys_vendor}=="Xen", GOTO="vm_hotadd_apply") in
/lib/udev/rules.d/40-vm-hotadd.rules
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https://bugs.launchpad.net/bugs/1518457
Title:
kswapd0 100% CPU usage
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