RFR: 8372584: [Linux]: Replace reading proc to get thread user CPU time with clock_gettime [v3]

[Jonas Norlinder]

On Mon, 1 Dec 2025 04:00:58 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Jonas Norlinder has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove unused imports
>
> @JonasNorlinder this PR isn't fixing two issue. I think [JDK-8372584](https://bugs.openjdk.org/browse/JDK-8372584) should just be closed as a duplicate of [JDK-8210452](https://bugs.openjdk.org/browse/JDK-8210452) (which I had forgotten about and which @larry-cable did not get further with).

Thanks for the comments @dholmes-ora and @tstuefe. I changed to aligning the signature to the standard. That way we don't have to document any requirements.

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PR Comment: https://git.openjdk.org/jdk/pull/28556#issuecomment-3603921763