RFR(xs): 8040245: G1: VM hangs during shutdown

[Per Liden]

Thanks Jon!

/Per

On 04/17/2014 05:26 PM, Jon Masamitsu wrote:
> Per,
>
> Change looks good.
>
> Reviewed.
>
> Jon
>
> On 4/17/2014 5:27 AM, Per Liden wrote:
>> Hi,
>>
>> Could I please have this fix reviewed.
>>
>> Summary: JDK-8037112 added controlled shutdown of concurrent marking
>> threads in G1 during VM exit, to prevent these threads from using
>> resources that are destroyed later in the shutdown phase. However, it
>> turns out there are at least two unrelated bugs (I've filed
>> JDK-8040803 and JDK-8040804) in the concurrent mark code which under
>> some circumstances can provoke the concurrent mark threads to hang,
>> and thus prevent the VM from exiting. This patch temporarily disables
>> the controlled shutdown of the CM threads (because it causes timeouts
>> in our testing) until those other bugs have been sorted out, at which
>> point we should enabled this again (filed JDK-8040807 to track that).
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8040245
>> Webrev: http://cr.openjdk.java.net/~pliden/8040245/webrev.0/
>>
>> Thanks!
>> /Per
>