RFR: 8255908: ExceptionInInitializerError due to UncheckedIOException while initializing cgroupv1 subsystem [v3]

[Severin Gehwolf]

On Fri, 20 Nov 2020 09:27:56 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

>> Poonam Bajaj has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Added UnchedkedIOException catch blocks for sumTokensIOStat and getLongEntry methods
>
> This seems OK. Ideally, I'd like for this to be tested. If it's interrupts it's going to be difficult. Missing files should be easy enough to test.
> 
> Aside: We really need to streamline file reading. We have too many of them unnecessarily all over the place. [JDK-8254001](https://bugs.openjdk.java.net/browse/JDK-8254001) should fix that. I'll prioritize it.

> @jerboaa Thanks for the review. As for the missing files, looks like mountInfoFileNotFound() and cgroupsFileNotFound() should be testing it.
> 
> This issue is being faced by a customer and they encountered failures due to interrupts during reading. These changes have been verified by them.

Thanks. That's OK. Preference would be to have an automated test for this issue, but this seems difficult in this case.

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PR: https://git.openjdk.java.net/jdk/pull/1303