RFR: 8203290: [PPC64, s390] Check functionality of JDK-8199712 (Flight Recorder) [v8]

[Tyler Steele]

On Wed, 12 Jan 2022 19:29:48 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

> Speaking of the thread sampler, to ensure stability, you also need a working implementation of os::ThreadCrashProtection. I can see there is the one in os_posix.cpp, and maybe that is the one already in use? Or does there need to be a specialization in os_aix.cpp? Please see https://bugs.openjdk.java.net/browse/JDK-8279077 for more details about crash protection.

Thanks for bringing this to my attention @mgronlun. I spent some time looking over crash protection, and I believe the implementation in os_posix is brought in for >= jdk16. If I understand the project history (especially relating to the issue you linked), this would not necessarily be true for the project before jdk 16, so it will need to be considered if this change is backported.

Is there a way to be sure that ThreadCrashProtection is present on AIX? I have forced a segfault, and it appears to behave the same on Linux x86 as it does on AIX Power.

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

PR: https://git.openjdk.java.net/jdk/pull/6885