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rss + file_mappedmakes 0.98 GiB (1057665024 bytes): while thepsoutput for VirtualBox shows 2.26 GiB (2378040 KiB). I haven't seen OOM killer in the logs. I guess this leaves out the option that the VirtualBox process is not the owner of all its page caches that it uses. Do you know if there's a way to find out which process is the owner?