Integrated: 8345323: Parallel GC does not handle UseLargePages and UseNUMA gracefully

[Albert Mingkun Yang]

On Thu, 5 Dec 2024 12:04:20 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> This patch reverts the default value of `OldSize` to its previous setting prior to being obsoleted in [JDK-8333962](https://bugs.openjdk.org/browse/JDK-8333962). The change addresses an issue where `OldSize` being set to zero results in a default `MinHeapSize` that is too small to handle LargePages correctly. This problem is exemplified by `ParallelArguments::initialize_heap_flags_and_sizes`, as identified in [JDK-8345323](https://bugs.openjdk.org/browse/JDK-8345323).
> 
> Changing the default value of `OldSize` may have broader implications due to the complexity of the logic that determines default values for various flags. Altering one default can lead to cascading effects and potential breakages elsewhere. For these reasons, this patch restores the previous default value of `OldSize` to mitigate such risks.

This pull request has now been integrated.

Changeset: a9a5f7cb
Author:    Albert Mingkun Yang <ayang at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/a9a5f7cb0a75b82d613ecd9018e13e5337e90363
Stats:     5 lines in 1 file changed: 4 ins; 0 del; 1 mod

8345323: Parallel GC does not handle UseLargePages and UseNUMA gracefully

Reviewed-by: sjohanss, tschatzl

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PR: https://git.openjdk.org/jdk/pull/22575