[jdk8u-dev] RFR: 8197408: Bad pointer comparison and small cleanup in os_linux.cpp [v3]

[Severin Gehwolf]

On Mon, 12 Dec 2022 09:49:28 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.
>
> Jonathan Dowland has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 65 additional commits since the last revision:
> 
>  - PlainRead: ProcessBuilder: jdk8u-appropriate command line flags
>  - adjust jtreg settings and imports for 8u
>  - 8197408: Bad pointer comparison and small cleanup in os_linux.cpp
>    
>    Reviewed-by: bobv, stuefe
>  - Test fix by Severin. Thanks!
>  - replace post-jdk8u Optional.isEmpty
>  - 8239559: Cgroups: Incorrect detection logic on some systems
>    
>    Adjust heuristic with cgroup mounts according to mountinfo
>    
>    Backport-of: 53ee0c4963007b86db7979312b81f990e6ce271a
>  - 8240189: [TESTBUG] Some cgroup tests are failing after JDK-8231111
>    
>    Reviewed-by: mdoerr
>    Backport-of: c92adf41587767e9c5c8e116cfaeb375d36928aa
>  - Don't pass --add-exports to jdk8u java inside docker
>    
>    These are JDK9+ module specific parameters.
>  - 8244500: jtreg test error in test/hotspot/jtreg/containers/docker/TestMemoryAwareness.java
>    
>    When the kernel doesn't support swap limits, expect host values instead.
>    
>    Reviewed-by: sgehwolf
>    Backport-of: fb5132254d834ba01a4b65ce64143843e83c674e
>  - Update file path in comment
>  - ... and 55 more: https://git.openjdk.org/jdk8u-dev/compare/74d73c96...0b65ee05

This cannot be merged as is, needs a rebase.

-------------

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