RFR: 8272773: Investigate making card table size configurable [v3]

[Thomas Schatzl]

On Fri, 8 Oct 2021 20:16:45 GMT, Vishal Chand <duke at openjdk.java.net> wrote:

>> Hi,
>> 
>> Please review the changes to make CardTable entry size configurable. The changes primarily consists of:
>> 
>> 1. Addition of a cmdline flag **GCCardSizeInBytes** to make the card size startup time configurable.
>> 2. Setting the card size based on the flag in G1, Parallel and Serial GC memory initialization paths.
>> 3. Setting BlockOffsetTable size and ObjectStartArray size based on the card size.
>
> Vishal Chand has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Merge branch 'card-size-configurable' of https://github.com/vish-chan/jdk into card-size-configurable
>  - Changes as per the first set of comments

Fwiw, we in the gc team agreed that this flag should be a product flag so that hopefully people will use it. So we need that CSR before integrating it :)

Hth,
  Thomas

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PR: https://git.openjdk.java.net/jdk/pull/5838