[concurrency-interest] DirectByteBuffers and reachabilityFence

Andrew Haley aph at redhat.com
Wed Dec 9 16:01:22 EST 2015

On 12/09/2015 08:36 PM, Vitaly Davidovich wrote:
>> Yes, you do increment the counter at each operation.  There has to be
>> a use of the counter in the finalizer to keep it alive.
> Right, that's what I thought would need to happen, but then you made it
> sound like only finalizer actually does something.  So here you have a
> possible performance degradation ...

Yes.  To be clear: I do not believe that a correct solution to
this problem which has no performance degradation is possible.
All we can do is minimize it.  With some fairly substantial
compiler work we can get pretty close.


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