RFR: 8259070: Add jcmd option to dump CDS

Yumin Qi minqi at openjdk.java.net
Fri Feb 26 00:09:05 UTC 2021


Hi, Please review

  Added jcmd option for dumping CDS archive during application runtime. Before this change, user has to dump shared archive in two steps: first run application with
  `java -XX:DumpLoadedClassList=<classlist> .... `  
 to collect shareable class names and saved in file `<classlist>` , then 
  `java -Xshare:dump -XX:SharedClassListFile=<classlist> -XX:SharedArchiveFile=<archivefile> ...`
  With this change, user can use jcmd to dump CDS without going through above steps. Also user can choose a moment during the app runtime  to dump an archive.
   The bug is associated with the CSR: https://bugs.openjdk.java.net/browse/JDK-8259798 which has been approved.
   New added jcmd option:
   `jcmd <pid or AppName> VM.cds static_dump <filename>`
   or
    `jcmd <pid or AppName> VM.cds dynamic_dump <filename>`
  To dump dynamic archive, requires start app with newly added flag `-XX:+RecordDynamicDumpInfo`, with this flag, some information related to dynamic dump like loader constraints will be recorded. Note the dumping process changed some object memory locations so for dumping dynamic archive, can only done once for a running app. For static dump, user can dump multiple times against same process. 
   The file name is optional, if the file name is not supplied, the file name will take format of `java_pid<number>_static.jsa` or `java_pid<number>_dynamic.jsa` for static and dynamic respectively. The `<number>` is the application process ID.

  Tests: tier1,tier2,tier3,tier4

Thanks
Yumin

-------------

Commit messages:
 - 8259070: Add jcmd option to dump CDS

Changes: https://git.openjdk.java.net/jdk/pull/2737/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2737&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259070
  Stats: 502 lines in 13 files changed: 496 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2737.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2737/head:pull/2737

PR: https://git.openjdk.java.net/jdk/pull/2737


More information about the hotspot-dev mailing list