RFR: 8057586: Explicit GC ignored if GCLocker is active [v9]

[Thomas Schatzl]

On Wed, 19 Apr 2023 11:25:10 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> Hi All,
>> 
>> Please review this change to guarantee that at least a Full GC is executed between the invocation and return of `System.gc` or `WhiteBox.fullGC`, even if the call is concurrent with an active `GCLocker `. 
>> 
>> The change should also handle the issues reported in JDK-8299276.
>> 
>> Split into 3 commits, one commit for changes to each GC in [G1, Parallel, Serial]. 
>> 
>> Testing: Tier 1-5.
>
> Ivan Walulya has updated the pull request incrementally with one additional commit since the last revision:
> 
>   skip young gcs for parallel too

lgtm.

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Marked as reviewed by tschatzl (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13191#pullrequestreview-1393589660