RFR (M) JDK-8150390: Move rs length sampling data to the sampling thread

[Mikael Gerdin]

Hi Jesper,

On 2016-02-25 18:04, Jesper Wilhelmsson wrote:
> Looks good!

Thanks!
/Mikael

> /Jesper
>
> Den 25/2/16 kl. 15:46, skrev Mikael Gerdin:
>> Hi all,
>>
>> The G1 Young RemSet Sampling Thread iterates over the young regions to
>> estimate
>> the remembered set sizes of the young gen in order to tweak the young
>> gen size
>> between gcs.
>>
>> All the iteration and the state related to this has been stored in the
>> YoungList
>> class for some strange reason. The state is actually only ever needed in
>> G1YoungRemSetSamplingThread::sample_young_list_rs_lengths()
>> so I've moved all of it there.
>> I also modified revise_young_list_target_length_if_necessary to
>> receive the new
>> rs length sample as a parameter instead of picking it up from the
>> YoungList class.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8150390
>> Webrev: http://cr.openjdk.java.net/~mgerdin/8150390/webrev.0
>> Testing: Local GC test suite and JPRT
>>
>> Thanks
>> /Mikael