RFR(S): 8227225: ParallelGC: add subspace transitions for young gen for gc+heap=info log lines

[Tony Printezis]

Hi all,

This is a follow-up to 8223575 and adds subspace info for eden and from
space to the gc+heap=info output for ParallelGC. I also added the before
capacity, similar to 8223575, as it can change during the GC (see, in fact,
example below).

Before:

[11.123s][info][gc,heap      ] GC(17) PSYoungGen: 4759616K->1664K(4545536K)
[11.123s][info][gc,heap      ] GC(17) ParOldGen: 1280K->1280K(1376256K)

After:

[12.133s][info][gc,heap      ] GC(25) PSYoungGen:
2065952K(2066432K)->1536K(1983488K) Eden: 2064384K(2064384K)->0K(1981952K)
From: 1568K(2048K)->1536K(1536K)

[12.133s][info][gc,heap      ] GC(25) ParOldGen:
1272K(1376256K)->1272K(1376256K)

http://cr.openjdk.java.net/~tonyp/8227225/webrev.0/

I have a similar change ready to go for GenCollectedHeap (Serial / CMS).
I’ll see what the feedback is on this before I open that for code review.

A couple of notes:

- I moved the PreGCValues class to gc/shared as I’d like to re-use it for
the GenCollectedHeap changes too.
- Is it worth also adding info about To space to the output?

Tony

PS Should I add the gc-pending-review label to any CR I open for code
review?


—————
Tony Printezis | @TonyPrintezis | tprintezis at twitter.com