RFR: 8318720: G1: Memory leak in G1CodeRootSet after JDK-8315503 [v3]

[Thomas Schatzl]

On Wed, 25 Oct 2023 15:13:51 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

>> Calling `ConcurrentHashTable:table.unsafe_reset()` in `G1CodeRootSet::clear()` does not free the entries that still in the table. This patch empties the table before the `unsafe_reset()` call to avoid memory leak.
>> 
>> Test:
>>  tier1 and tier2 (fastdebug and release) on Linux x86_64
>
> Zhengyu Gu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Adopt Thomas' code

Lgtm :)

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Marked as reviewed by tschatzl (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16352#pullrequestreview-1697663397