RFR: 8245543: Cgroups: Incorrect detection logic on some systems (still reproducible) [v2]

[Severin Gehwolf]

On Sun, 4 Oct 2020 18:12:14 GMT, Boris Ulasevich <bulasevich at openjdk.org> wrote:

>> Severin Gehwolf has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8245543: Cgroups: Incorrect detection logic on some systems (still reproducible)
>
> src/java.base/linux/classes/jdk/internal/platform/CgroupSubsystemFactory.java line 72:
> 
>> 70:      *  Pattern explanation:
>> 71:      *
>> 72:      *  /`````\    /`````\    /`````\    /```````\    /```````\    /```\ (8) /```````\     (10) + (11)
> 
> Alternatively, consider the inline comment:
> 
>     private static final Pattern MOUNTINFO_PATTERN = Pattern.compile(
>         "^[^\\s]+\\s+[^\\s]+\\s+[^\\s]+\\s+" +  // (1) + (2) + (3)
>         "([^\\s]+)\\s+([^\\s]+)\\s+"         +  // (4) + (5) - group 1,2: mount point, mount options
>         "[^-]+-\\s+"    +                       // (6) + (7) + (8)
>         "([^\\s]+)\\s+" +                       // (9) - group 3: fstype
>         ".*$");                                 // (10) + (11)

Good suggestion. I've changed it to what you've suggested and removed the unused groups 1 and 2.

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PR: https://git.openjdk.java.net/jdk/pull/485