IIRC CDGC includes two major enhancements:
1. The snapshot GC for Linux. (Does this work on OSX/FreeBSD/anything
Posix, or just Linux? I'm a bit skeptical about whether a snapshot GC
is really that great an idea given its propensity to waste memory on
long collect cycles with a lot of mutation.)
I guess, at least it uses fork IIRC.
2. I think there was some precise heap scanning-related stuff in it. I
originally tried to implement precise heap scanning a couple years ago,
but it went nowhere for reasons too complicated to explain here. Given
this experience, I'm not inclined to try again until the compiler has
extensions for generating pointer offset information.
What's the status of that anyway? Every patch in that bugzilla entry is
marked obsolete and there's no real final answer.
