RFR: 8322420: [Linux] cgroup v2: Limits in parent nested control groups are not detected [v7]

[Jan Kratochvil]

On Wed, 21 Feb 2024 14:02:12 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

> I'm surprised that the hierarchical memory limit look-up wouldn't see it for v1. Either way, using the traversal approach you'd see that `foo/bar` has `2 GB`, when traversing up the hierarchy you'd see `1 GB` for `foo` and use that as it's less than the earlier value. So would be covered by this fix? What am I missing?

It will be needlessly slower and it will not notice during execution changes of limits on other levels of the cgroup hierarchy than the initial chosen one.

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PR Comment: https://git.openjdk.org/jdk/pull/17198#issuecomment-1956745199