Code Review Request: 6871109: G1: remove the concept of the scan only prefix

[john cuthbertson - Sun Microsystems]

Hi Everyone,

Can I have a couple of volunteers review the changes to remove the scan 
only prefix code? The changes can be found at 
http://cr.openjdk.java.net/~johnc/6871109/webrev.00/.

In particular pay close attention to the changes in 
g1CollectorPolicy.cpp (specifically 
G1CollectorPolicy::calculate_young_list_target_config) where the code 
that calculates the length of the young list (the innermost loop) had to 
be separated from the code that varied the size of the so-prefix.

Testing: refworkload, SPECjbb2005 (with fixed and variable sized young 
generation size). I also enabled the tracing the young list config code 
and compared the output from a reference workspace.

Regards,

JohnC