(urgent) RFR: 8148771: os::active_processor_count() returns garbage which causes VM to crash

[David Holmes]

Thanks Kim.

I'll apply the trivial rule to this and push as soon as testing is complete.

David

On 2/02/2016 11:14 AM, Kim Barrett wrote:
>> On Feb 1, 2016, at 7:51 PM, David Holmes <david.holmes at oracle.com> wrote:
>>
>> This is a backout of the fix for JDK-8147906 which changes the GC to use active_processor_count() during initialization. Some systems with aggressive power management can report continually varying numbers of available processors, via sched_getaffinity, and it seems the GC code can not tolerate that. So we hg backout JDK-8147906 and revert to using processor_count() again. We will then look at how to address this going forward.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8148771
>>
>> webrev http://cr.openjdk.java.net/~dholmes/8148771/webrev/
>>
>> Thanks,
>> David
>
> Looks good.
>