RPI3 swap experiments

[bob prohaska]

The patch to report OOMA information did its job, very tersely. The console reported
v_free_count: 5439, v_inactive_count: 1
Aug  1 18:08:25 www kernel: pid 93301 (c++), uid 0, was killed: out of swap space

The entire buildworld.log and gstat output are at
http://www.zefox.net/~fbsd/rpi3/swaptests/r336877M/

It appears that at 18:08:21 a write to the USB swap device took 530.5 ms, 
next top was killed and ten seconds later c++ was killed, _after_ da0b
was no longer busy.

This buildworld stopped a quite a bit earlier than usual; most of the time
the buildworld.log file is close to 20 MB at the time OOMA acts. In this case
it was around 13 MB. Not clear if that's of significance.

If somebody would indicate whether this result is informative, and any possible
improvements to the test, I'd be most grateful. 

Thanks for reading,

bob prohaska