RFR: 8255908: ExceptionInInitializerError due to UncheckedIOException while initializing cgroupv1 subsystem [v2]

[Severin Gehwolf]

On Thu, 19 Nov 2020 20:49:07 GMT, Poonam Bajaj <poonam at openjdk.org> wrote:

>> Shouldn't you add a check in src/java.base/linux/classes/jdk/internal/platform/cgroupv2/CgroupV2Subsystem.java:sumTokensIOStat ?
>> 
>> What about getLongEntry in src/java.base/linux/classes/jdk/internal/platform/CgroupSubsystemController.java?  There are streams operations occuring there as well.
>
> @bobvandette sumTokensIOStat() and getLongEntry() should also have the catch blocks, and I have added those. Please review the latest commit.

@poonamparhar Wouldn't we be able to reproduce this by a test? E.g. `test/jdk/jdk/internal/platform/cgroup/TestCgroupSubsystemFactory.java` It should already be checking some of this with `mountInfoFileNotFound()` and `cgroupsFileNotFound()`. Thoughts?

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