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

[Severin Gehwolf]

On Thu, 19 Nov 2020 20:49:16 GMT, Poonam Bajaj <poonam at openjdk.org> wrote:

>> Hi,
>> 
>> Please review this simple change that catches UncheckedIOException that can occur if /proc/self/cgroup or /proc/self/mountinfo files don't exist on the system, or if there is an interrupt while these are being read.
>> 
>> Testing: Tier1, Tier2 and Tier3.
>> 
>> Thanks,
>> Poonam
>
> 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.

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