CRR (S): 7097048: G1: extend the G1 SA changes to print per-heap space information

[Tony Printezis]

Could I have a couple of code reviews for some more changes to the SA to 
ensure that the jmap -heap output for G1 is consistent with what's 
generated for the other GCs (see example below)?

http://cr.openjdk.java.net/~tonyp/7097048/webrev.0/

Thanks,

Tony


jmap -heap with G1 before:

...
Heap Usage:
Garbage-First (G1) Heap
   region size = 1048576 (1.0MB)
   regions     = 20
   capacity    = 20971520 (20.0MB)
   used        = 7154320 (6.8228912353515625MB)
   free        = 13817200 (13.177108764648438MB)
   34.11445617675781% used
Perm Generation:
   capacity = 16777216 (16.0MB)
   used     = 2570176 (2.45111083984375MB)
   free     = 14207040 (13.54888916015625MB)
   15.319442749023438% used

jmap -heap with G1 after:

...
Heap Usage:
G1 Young Generation
Eden Space:
  capacity = 5242880 (5.0MB)
  used     = 3145728 (3.0MB)
  free     = 2097152 (2.0MB)
  60.0% used
 From Space:
  capacity = 1048576 (1.0MB)
  used     = 1048576 (1.0MB)
  free     = 0 (0.0MB)
  100.0% used
To Space:
  capacity = 0 (0.0MB)
  used     = 0 (0.0MB)
  free     = 0 (0.0MB)
  0.0% used
G1 Old Generation
  capacity = 14680064 (14.0MB)
  used     = 6509792 (6.208221435546875MB)
  free     = 8170272 (7.791778564453125MB)
  44.34443882533482% used
Perm Generation:
  capacity = 16777216 (16.0MB)
  used     = 2658904 (2.5357284545898438MB)
  free     = 14118312 (13.464271545410156MB)
  15.848302841186523% used

jmap -heap with ParallelGC (for comparison):

...
Heap Usage:
PS Young Generation
Eden Space:
   capacity = 17301504 (16.5MB)
   used     = 14982784 (14.2886962890625MB)
   free     = 2318720 (2.2113037109375MB)
   86.59815932765152% used
 From Space:
   capacity = 2883584 (2.75MB)
   used     = 0 (0.0MB)
   free     = 2883584 (2.75MB)
   0.0% used
To Space:
   capacity = 2883584 (2.75MB)
   used     = 0 (0.0MB)
   free     = 2883584 (2.75MB)
   0.0% used
PS Old Generation
   capacity = 44040192 (42.0MB)
   used     = 240248 (0.22911834716796875MB)
   free     = 43799944 (41.77088165283203MB)
   0.5455198742094494% used
PS Perm Generation
   capacity = 16777216 (16.0MB)
   used     = 2574864 (2.4555816650390625MB)
   free     = 14202352 (13.544418334960938MB)
   15.34738540649414% used