zodb / relstorage / 390

74%

master: 92%

push

travis-ci

Initial pass at two-generation cache.

Still need to probably segment the main portion into protected/probation
to get the right behaviour.

The code is unoptimized but all tests pass (with minor modifications to
account for the frequency-based preservation, which is actually kind of
cool---although we will ultimately need more specific tests).

The mixed micro-benchmark is actually faster. Populating is notably
slower. Reading is basically unchanged (slightly slower).

103 of 103 new or added lines in 1 file covered. (100.0%)

4736 of 4979 relevant lines covered (95.12%)

4.3 hits per line