JDK-8223575 : add subspace transitions to gc+metaspace=info log lines
- Type: Enhancement
- Component: hotspot
- Sub-Component: gc
- Affected Version: 13
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- Submitted: 2019-05-08
- Updated: 2022-06-10
- Resolved: 2019-07-04
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| JDK 11 | JDK 14 | Other |
|---|---|---|
| 11.0.17-oracleFixed | 14 b05Fixed  |
naFixed |
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Description
Currently, gc+metaspace=info log lines look like this: [60.082s][info ][gc,metaspace ] GC(24) Metaspace: 2209K->2209K(1056768K) When coops are enabled, this can be confusing as users wonder why they asked for, say, 128M for the metaspace and the log is reporting over 1G. I think it will be valuable to also report the transitions of the metaspace subspaces (at least, when coops are enabled) so that users can get more accurate information about the space they are sizing. I propose the output to look something like this: [8.999s][info][gc,metaspace ] GC(7) Metaspace: 2130K->2130K(1056768K) ClassMetadata: 1906K->1906K(8192K) ClassSpace: 223K->223K(1048576K) (I'm open to suggestions on what to call "ClassMetadata" and "ClassSpace")
Comments
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