RFR: 8205024: ZGC: Worker threads boost mode not always enabled when is should be

[Per Liden]

Thanks Stefan!

/Per

On 06/14/2018 12:36 PM, Stefan Karlsson wrote:
> Looks good.
> 
> StefanK
> 
> On 2018-06-14 11:47, Per Liden wrote:
>> There's a race when deciding if worker threads should be boosted (very 
>> similar to the race in JDK-8205022), which can result in worker 
>> threads not being boosted when they should. The effect of this is that 
>> the GC cycle takes longer to complete, which in turn means that 
>> stalled threads wait longer than they would have done otherwise.
>>
>> The solution to this is very similar to the solution to JDK-8205022.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8205024
>> Webrev: http://cr.openjdk.java.net/~pliden/8205024/webrev.0
>>
>> Testing: tier{1,2,3,4}
>>
>> /Per