RFR: 8255716: AArch64: Regression: JVM crashes if manually offline a core

[Patrick Zhang]

On Mon, 2 Nov 2020 15:43:50 GMT, Andrew Dinn <adinn at openjdk.org> wrote:

>>> @AntonKozlov If the code that sets the A53MAC property really needs to be based on the cpu count obtained from /proc/cpuinfo
>> 
>> I would like to know that for sure. The code was introduced in http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/6e2422a230fd#l6.48, unfortunately I don't know reasoning behind.
>> 
>>> Could you raise a new JIRA for that and propose a fix?
>> 
>> Ok, I'll do this, just to make sure we set the feature just as it was before.
>> 
>> @cnqpzhang I will likely re-introduce cpu_line counting in the follow-up patch. It would be handy if you just relax the assert (like `cpu_lines >= os::processor_count()`, btw, does this work for you, is the guess is correct?) instead of removing it completely. But this is not very important.
>> Also, I'm not a reviewer in the jdk project, not sure if I can be credited for review.
>
>>  Also, I'm not a reviewer in the jdk project, not sure if I can be credited for review.
> 
> Anyone can offer a review, not just big 'R' Reviewers. Small 'r' reviewers don't count towards official sign-off but they *do* count as far as getting it right is concerned. So, thanks for chipping in.

@adinn Could you please do me a favor and help intergrade this PR? Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/983