Belated out of swap kill on rpi3 at r359216

[bob prohaska]

Just to wrap up, I tend to agree that 
delays writing to the microSD filesystem were 
blocking swap traffic and causing OOM kills. 
Turning off OOM allowed the OS build/install 
to complete successfully. 

Why this behavior started recently is less clear.
The card was placed in service in October of 2018 and
has been in strenuous use since then. The first hints
of trouble occurred in late 2019. Perhaps this phenomenon
is a useful warning of impending wearout.

The gstat logs are at 
http://www.zefox.net/~fbsd/rpi3/swaptests/r359216/
in case anybody's curious.

Thanks for all your attention,

bob prohaska