RFR: 8317139: [JVMCI] oop handles clearing message pollutes event log

[Tobias Hartmann]

On Thu, 28 Sep 2023 07:20:52 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

> The message for the event of clearing oop handles after each libjvmci compilation should only be logged at level 2 (i.e. `-XX:JVMCIEventLogLevel=2` or `-XX:JVMCITraceLevel=2`). Otherwise, it crowds out more useful events in hs-err crash logs. For example:
> 
> JVMCI Events (20 events):
> Event: 0.853 Thread 0x00007fdde0002470 compacted oop handles in JVMCI runtime 4 from 94 to 68
> Event: 0.853 Thread 0x00007fde0002e6d0 compacted oop handles in JVMCI runtime 2 from 102 to 63
> Event: 0.855 Thread 0x00007fde0002e6d0 compacted oop handles in JVMCI runtime 2 from 70 to 69
> Event: 0.856 Thread 0x00007fdde0002470 compacted oop handles in JVMCI runtime 4 from 71 to 70
> Event: 0.861 Thread 0x00007fdde0002470 compacted oop handles in JVMCI runtime 4 from 78 to 77
> Event: 0.866 Thread 0x00007fde0002e6d0 compacted oop handles in JVMCI runtime 2 from 82 to 81
> Event: 0.870 Thread 0x00007fded01824f0 compacted oop handles in JVMCI runtime 0 from 88 to 85
> Event: 0.875 Thread 0x00007fdde0002470 compacted oop handles in JVMCI runtime 4 from 91 to 90
> Event: 0.876 Thread 0x00007fded01824f0 compacted oop handles in JVMCI runtime 0 from 86 to 52
> Event: 0.878 Thread 0x00007fde0002d2f0 compacted oop handles in JVMCI runtime 1 from 69 to 65
> Event: 0.897 Thread 0x00007fde0002e6d0 compacted oop handles in JVMCI runtime 2 from 101 to 99
> Event: 0.897 Thread 0x00007fde0002e6d0 compacted oop handles in JVMCI runtime 2 from 100 to 70
> Event: 0.897 Thread 0x00007fdde00037f0 compacted oop handles in JVMCI runtime 3 from 99 to 66
> Event: 0.902 Thread 0x00007fde0002e6d0 compacted oop handles in JVMCI runtime 2 from 71 to 70
> Event: 0.916 Thread 0x00007fde0002d2f0 compacted oop handles in JVMCI runtime 1 from 78 to 62
> Event: 0.916 Thread 0x00007fdde00037f0 compacted oop handles in JVMCI runtime 3 from 81 to 79
> Event: 0.919 Thread 0x00007fdde0002470 compacted oop handles in JVMCI runtime 4 from 100 to 80
> Event: 0.922 Thread 0x00007fde0002d2f0 compacted oop handles in JVMCI runtime 1 from 70 to 69
> Event: 0.923 Thread 0x00007fdde0002470 compacted oop handles in JVMCI runtime 4 from 85 to 84
> Event: 0.926 Thread 0x00007fded01824f0 compacted oop handles in JVMCI runtime 0 from 77 to 74

Looks good to me too.

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Marked as reviewed by thartmann (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15956#pullrequestreview-1650569031