RFR: JDK-8293114: GC should trim the native heap [v11]

[Thomas Stuefe]

On Wed, 5 Jul 2023 17:45:37 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Thomas Stuefe has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 41 commits:
>> 
>>  - fix windows build
>>  - Merge branch 'master' into JDK-8293114-GC-trim-native
>>  - wip
>>  - Merge branch 'master' into JDK-8293114-GC-trim-native
>>  - wip
>>  - Remove adaptive stepdown coding
>>  - Merge master
>>  - wip
>>  - Merge branch 'master' into JDK-8293114-GC-trim-native
>>  - wip
>>  - ... and 31 more: https://git.openjdk.org/jdk/compare/22e17c29...162b880a
>
> src/hotspot/share/gc/g1/g1CollectedHeap.cpp line 918:
> 
>> 916:   }
>> 917: 
>> 918:   TrimNative::PauseMark trim_native_pause("gc");
> 
> Maybe instead of whack-a-mole game of putting the pause in most GC safepoint ops, we should "just" put this mark straight into `VMOperation`, so that _all_ safepoint ops are covered? Or, if we want to limit to GC ops, `VM_GC_Operation`?

Oh, this is a good idea.

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PR Review Comment: https://git.openjdk.org/jdk/pull/10085#discussion_r1254232411