Hi.

I've written patch which makes Ruby's garbage collector copy-on-write 
friendly. Details can be found on my blog, 
http://izumi.plan99.net/blog/index.php/category/optimizing-rails/, in 
the "Making Ruby's garbage collector copy-on-write friendly" series.

Matz had shown interest in merging the patch into Ruby 1.9. I'm 
wondering whether that has already been done, and if not, whether I can 
be of any assistance.

Regards,
Hongli Lai