[jdk8u-dev] RFR: 8197408: Bad pointer comparison and small cleanup in os_linux.cpp

[Jonathan Dowland]

On Wed, 9 Nov 2022 10:25:03 GMT, Jonathan Dowland <jdowland at openjdk.org> wrote:

> This is a backport of [JDK-8197408](https://bugs.openjdk.org/browse/JDK-8197408) to jdk8u-dev as part of cgroups v2. I've backported it as a pre-requisite for 8278951: containers/cgroup/PlainRead.java fails on Ubuntu 21.10 (<https://github.com/openjdk/jdk8u-dev/pull/155>)
> 
> Most of the original patch has been integrated already: I've left a whitespace change in for os_linux.cpp to hopefully avoid context problems later on. The majority of this patch is introducing the test PlainRead.java.
> 
> Not clean: test adjustments to jtreg metadata, imports, and JVM flags needed.

The test passes for me in a cgroups v1 host. I think the state (passes on v1, fails on v2) is consistent with the state of things when this patch was committed. I think a later patch might fix this for v2, but it's moot if we consider backporting 8281181, which removes the check against CPU Shares entirely.

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PR: https://git.openjdk.org/jdk8u-dev/pull/164