Integrated: 8285710: Miscalculation of G1CardSetAllocator unused memory size

[tqxia]

On Wed, 27 Apr 2022 11:03:18 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.

This pull request has now been integrated.

Changeset: 9835678a
Author:    dev-tianqixia <txiadev at gmail.com>
Committer: Thomas Schatzl <tschatzl at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/9835678a8658110cd2dac489cf55ab3d9074ea6d
Stats:     3 lines in 1 file changed: 0 ins; 1 del; 2 mod

8285710: Miscalculation of G1CardSetAllocator unused memory size

Reviewed-by: tschatzl, ayang

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