RFR: Make heap counters update completely asynchronous

[Roman Kennke]

Ah. Alright then!

Am 21. September 2017 18:51:42 MESZ schrieb Aleksey Shipilev <shade at redhat.com>:
>On 09/21/2017 06:44 PM, Roman Kennke wrote:
>> Am 21.09.2017 um 18:40 schrieb Aleksey Shipilev:
>>>
>http://cr.openjdk.java.net/~shade/shenandoah/concthread-periodic/webrev.01/
>>>
>>> This uses the periodic tasks facility provided by VM to update the
>counters asynchronously.
>>> Allocation and GC paths are triggering the update, but do not
>perform the update themselves. This
>>> allows to simplify allocation path, capture GCLAB allocations
>without risking deadlocks, etc.
>>>
>>> Testing: hotspot_gc_shenandoah, allocation benchmarks
>>>
>>> Thanks,
>>> -Aleksey
>>>
>> I like it.
>> 
>> Do we really want/need to remove stuff from metaspaceCounters.cpp|hpp
>?
>
>These were our additions, along with TODO to clean that mess up.
>Upstream does not have it.
>
>-Aleksey

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