RFR: Take boost mode into account when calculating duration of gc

[Per Liden]

Thanks for reviewing!

/Per

On 03/05/2018 04:45 PM, Erik Österlund wrote:
> Hi Per,
> 
> One step in the right direction. Looks good.
> 
> Thanks,
> /Erik
> 
> On 2018-03-05 15:24, Per Liden wrote:
>> When using boost mode (i.e. when we're using all available worker 
>> threads instead of ConcGCThreads) we typically complete a GC cycle 
>> much faster than normal (as intended). However, this causes the 
>> "duration of gc" calculations to be artificially deflated, can later 
>> lead to a situation where we risk starting a GC cycle too late. This 
>> patch corrects the "duration of gc" calculation by taking the "boost 
>> factor" into account.
>>
>> http://cr.openjdk.java.net/~pliden/zgc/normalized_duration/webrev.0/
>>
>> /Per
>