Right now the GC timer does whatever type of collection the next collection would have been, which is almost always an EdenCollection. It then thinks that it has done all of the work it was supposed to do and never schedules another GC. Ideally we'd like to have some heuristics for the timer that would schedule both EdenCollections and FullCollections, but the easiest fix for now is to always do FullCollections, since that will at least be a non-regression.
Created attachment 223125 [details] Patch
Committed r163384: <http://trac.webkit.org/changeset/163384>
> Ideally we'd like to have some heuristics for the timer that would schedule both EdenCollections and FullCollections Yeah -- and the schedule for full collections should be very long, to avoid touching too many pages.