JDK-8227224 : GenCollectedHeap: add subspace transitions for young gen for gc+heap=info log lines
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2019-07-03
  • Updated: 2019-09-26
  • Resolved: 2019-08-30
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JDK 14
14 b13Fixed
Related Reports
Relates :  
JDK-8227225 - ParallelGC: add subspace transitions for young gen for gc+heap=info log lines
Relates :  
JDK-8223575 - add subspace transitions to gc+metaspace=info log lines
Description
Currently, the gc+heap=info log lines for GenCollectedHeap look as follows:

Serial:

[10.838s][info][gc,heap      ] GC(29) DefNew: 551835K->1306K(619328K)
[10.838s][info][gc,heap      ] GC(29) Tenured: 1166K->1166K(1376256K)

CMS:

[30.189s][info][gc,heap      ] GC(326) ParNew: 552345K->1814K(619328K)
[30.189s][info][gc,heap      ] GC(326) CMS: 1325K->1325K(1376256K)

Similarly to JDK-8223575, it will be vey helpful to add size transitions for the young gen sub spaces (at least Eden and From-Space).

While I'm at it, I'll also add the capacity before the GC (again, similar to the change for JDK-8223575) as, in certain situations, it can change during the GC.
Comments
URL: https://hg.openjdk.java.net/jdk/jdk/rev/374f3f9dda6f User: tonyp Date: 2019-08-30 19:03:51 +0000
30-08-2019