JDK-8259070 : Add jcmd option to dump CDS
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 17
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • Submitted: 2021-01-04
  • Updated: 2022-01-25
  • Resolved: 2021-04-15
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JDK 17
17 b19Fixed
Related Reports
CSR :  
JDK-8259798 - Add jcmd option to dump CDS
Relates :  
JDK-8261455 - Automatically generate the CDS archive if necessary
Relates :  
JDK-8280543 - Update the "java" and "jcmd" tool specification for CDS
Relates :  
JDK-8265393 - VM crashes if both -XX:+RecordDynamicDumpInfo and -XX:SharedArchiveFile options are specified
Relates :  
JDK-8277242 - CDS docs should discuss dumping with jcmd VM.cds
Description
Supply a jcmd option to dump CDS archive during application running. This has the benefits that
1.  Users don't need to run with -XX:DumpLoadedClassList=<file> first, then run again with -Xshare:dump
2.  Users can chose a moment when they think it is good to dump the archive, that is, a stable state which contains the most classes needed in CDS.
3. For storing MDO in CDS, a moment when most methods already compiled.
Comments
Changeset: e7cbeba8 Author: Yumin Qi <minqi@openjdk.org> Date: 2021-04-15 05:21:24 +0000 URL: https://git.openjdk.java.net/jdk/commit/e7cbeba8
15-04-2021