> 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
Yumin Qi has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 14 commits: - Merge branch 'master' of ssh://github.com/yminqi/jdk into jdk-8259070 - Restructed code and rename LingeredTestApp.java to JCmdTestLingeredApp.java - Merge branch 'master' of ssh://github.com/yminqi/jdk into jdk-8259070 - Merge branch 'master' of ssh://github.com/yminqi/jdk into jdk-8259070 - Fix revert unintentionally comment, merge master. - Merge branch 'master' of ssh://github.com/yminqi/jdk into jdk-8259070 - Remove CDS.getVMArguments, changed to use VM.getRuntimeVMArguments. Removed unused function from ClassLoader. Improved InstanceKlass::is_shareable() and related test. Added more test scenarios. - Remove redundant check for if a class is shareable - Fix according to review comment and add more tests - Fix filter more flags to exclude in static dump, add more test cases - ... and 4 more: https://git.openjdk.java.net/jdk/compare/a756d8d7...b3d20348 ------------- Changes: https://git.openjdk.java.net/jdk/pull/2737/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2737&range=09 Stats: 835 lines in 23 files changed: 762 ins; 58 del; 15 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
