RFR: 7463: JfrEditor instances are kept in memory by NavigationHistory [v2]

[Jean-Philippe Bempel]

> Provide a sub class of NavigationHistory instead of implementing a
> full INavigationHistory.
> JfrEditor is not kept anymore when releasing state/disposing.
> 
> Provide a sub class of NavigationHistory instead of implementing a
> full INavigationHistory.
> JfrEditor is not kept anymore when releasing state/disposing.
> 
> JMC 8.1, opening 13 recordings, then closing them:
> 
> COMP11909:~/git/jmc-jpbempel$ jcmd 55089 GC.heap_info
> 55089:
>  garbage-first heap   total 989184K, used 488772K [0x0000000700000000, 0x0000000800000000)
>   region size 1024K, 1 young (1024K), 0 survivors (0K)
>  Metaspace       used 60486K, capacity 65423K, committed 65584K, reserved 1105920K
>   class space    used 6822K, capacity 8453K, committed 8576K, reserved 1048576K
> COMP11909:~/git/jmc-jpbempel$ jcmd 55089 GC.run
> 55089:
> Command executed successfully
> COMP11909:~/git/jmc-jpbempel$ jcmd 55089 GC.heap_info
> 55089:
>  garbage-first heap   total 989184K, used 488410K [0x0000000700000000, 0x0000000800000000)
>   region size 1024K, 1 young (1024K), 0 survivors (0K)
>  Metaspace       used 61621K, capacity 66457K, committed 66736K, reserved 1107968K
>   class space    used 6938K, capacity 8583K, committed 8704K, reserved 1048576K
> 
> memory is not released even after GC
> 
> JMC 8.2 + fix:
> 
> COMP11909:~/git/jmc-jpbempel$ jcmd 56259 GC.heap_info
> 56259:
>  garbage-first heap   total 1625088K, used 556392K [0x0000000700000000, 0x0000000800000000)
>   region size 1024K, 1 young (1024K), 0 survivors (0K)
>  Metaspace       used 61931K, capacity 66724K, committed 66992K, reserved 1107968K
>   class space    used 6991K, capacity 8586K, committed 8704K, reserved 1048576K
> COMP11909:~/git/jmc-jpbempel$ jcmd 56259 GC.run
> 56259:
> Command executed successfully
> COMP11909:~/git/jmc-jpbempel$ jcmd 56259 GC.heap_info
> 56259:
>  garbage-first heap   total 109568K, used 28592K [0x0000000700000000, 0x0000000800000000)
>   region size 1024K, 1 young (1024K), 0 survivors (0K)
>  Metaspace       used 62269K, capacity 67053K, committed 67248K, reserved 1107968K
>   class space    used 6994K, capacity 8588K, committed 8704K, reserved 1048576K

Jean-Philippe Bempel has updated the pull request incrementally with one additional commit since the last revision:

  keep navigation to the right page
  
  as long as the page is still open

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

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/338/files
  - new: https://git.openjdk.java.net/jmc/pull/338/files/749158b4..edcb96d7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=338&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=338&range=00-01

  Stats: 14 lines in 2 files changed: 10 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jmc/pull/338.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/338/head:pull/338

PR: https://git.openjdk.java.net/jmc/pull/338