RFR: 8272124: Cgroup v1 initialization causes NullPointerException when path contains colon [v2]

[Harold Seigel]

On Tue, 17 Aug 2021 17:39:49 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

>> Please review this small fix for JDK-8272124.  The fix puts a limit of 3 when splitting self cgroup lines by ':' so that Cgroup paths won't get truncated if they contain embedded ':'s.  For example, an entry of "11:memory:/user.sli:ce" in a /proc/self/cgroup file will now result in a Cgroup path of "/user.sli:ce" instead of "/user.sli".
>> 
>> The fix was tested with Mach5 tiers 1 and 2, and Mach5 tiers 3-5 on Linux x64 and Linux aarch64.
>> 
>> Thanks, Harold
>
> Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add test case, comments, and other small changes

Please review this update that modifies the new test case to have a mountinfo entry that contains multiple ":" characters.
Thanks, Harold

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PR: https://git.openjdk.java.net/jdk/pull/5127