https://lists.debian.org/debian-devel/2012/05/msg01092.html https://lists.debian.org/debian-devel/2012/06/msg00311.html (summary of the above)
https://wiki.debian.org/SSDOptimization#Reduction_of_SSD_write_frequency_via_RAMDISK and various bugs about systemd doing tmp on tmpfs by default: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718906 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=807769 and systemd ignoring RAMTMP: https://github.com/debian-pi/raspbian-ua-netinst/issues/210
