I used to run my VirtualBox Win10 guest with 6GB RAM (host usage around 7GB+) in kernel 4.19.
Yesterday did an kernel upgrade to 5.4 and my laptop kept hanging (OOM swap AFAIK with Chrome+Firefox). Upon checking it appeared my usual VirtualBox Win10 guest with 6GB RAM was using around 12GB+ instead of the usual 7GB+ in 4.19 kernel.
I double checked with my another WinXP guest with 1GB, it had the same behavior, 4.19 using 1GB+ and 5.4 using 2GB+.
When I rebooted back to 4.19 all back to normal. I've uninstalled the 5.4 ATM, however, do any of you faced this issue?
p/s: My laptop has 16GB RAM, running KDE and nVidia turned off (bbswitch ON when needed).