RFR: 8285710: miscalculation of G1CardSetAllocator wasted memory size [v3]

[tqxia]

On Sat, 7 May 2022 02:22:05 GMT, tqxia <duke at openjdk.java.net> wrote:

>> when calculating the wasted memory size of G1CardSetAllocator, the code erroneously substracted both _segmented_array.num_allocated_slots() and _free_slots_list.pending_count() from _segmented_array.num_available_slots().
>> 
>> The correct formula should be: num_wasted_slots = _segmented_array.num_available_slots() - (_segmented_array.num_allocated_slots() - (uint)_free_slots_list.pending_count()).
>> 
>> This can potentially leads to an arithmetic overflow and misleading information will be displayed when G1SummarizeRSetStatsPeriod is set.
>
> tqxia has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:
> 
>   8285710: miscalculation of G1CardSetAllocator unused memory size

Code is updated according to comments above. Branch is sync with master. Please review again.

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PR: https://git.openjdk.java.net/jdk/pull/8424