RFR: 8272124: Cgroup v1 initialization causes NullPointerException when cgroup path contains colon [v3]

[Severin Gehwolf]

On Wed, 18 Aug 2021 12:25:45 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 mountinfo containing colongs to test

Changes requested by sgehwolf (Reviewer).

test/jdk/jdk/internal/platform/cgroup/TestCgroupSubsystemFactory.java line 207:

> 205:     // `hierarchy-ID:controller-list:cgroup-path`. This cgroup-path intentionally
> 206:     // contains a colon to ensure that the correct path is being extracted by the
> 207:     // login in CgroupSubsystemFactory.

s/login/logic

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