wiredtiger/wiredtiger — pull request #1500 by agorrod (2014-12-19 04:48:54+00:00)
Title: Use the eviction server to write pages with READGEN_OLDEST set.

Even before the eviction trigger has been reached. This should mean
that we clear those pages out of cache earlier, and hopefully will
save application threads from doing the evictions (at least sometimes).