How CMS interleave with ParNew

[Guoqin Zheng]

Hey folks,

While search for how CMS works in detail, I happened to an article saying
usuablly before the inital-mark phase and remark phase, there is young gen
collection happening and the initial-mark/remark also scan young gen space.
So

   1. Can you help me understand how the ParNew collection work with CMS to
   improve the performance.
   2. Why the young gen space needs to be scanned
   3. If the remark takes very long, what does that mean?
   4. Finally, is there a official/or good docs talking about CMS in detail?

Thanks,

G. Zheng
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