RFR: 8366854: Extend jtreg failure handler with THP info [v2]

[Aleksey Shipilev]

On Thu, 4 Sep 2025 07:49:56 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> I propose that we also dump /proc/meminfo, /proc/vmstat, and /sys/kernel/mm/transparent_hugepage/{enabled, defrag} from the failure handler.
>> 
>> This information has been helpful when investigating a failure where there was an unexpected lack of transparent huge pages.
>
> Stefan Karlsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add shmem_enabled

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27086#pullrequestreview-3185246018