RFR: 8007806: Need a Throwables performance counter

Alan Bateman Alan.Bateman at oracle.com
Sat Feb 23 20:08:27 UTC 2013

On 23/02/2013 19:39, Peter Levart wrote:
> Hi Nils,
> If the counters are updated frequently from multiple threads, there 
> might be contention/scalability issues. Instead of synchronization on 
> updates, you might consider using atomic updates provided by 
> sun.misc.Unsafe, like for example:
Most of the jvmstat counters are in VM and we only update a small number 
of counters in the libraries. Even so, I think your idea is good as 
further usage could potentially to be an issue, particularly 
add/increment (which involves a get at this). So irrespective of Nil's 
patch (which I think is now just a proposal to add a counter, not 
original patch that Jason was commenting on) then we should take your patch.


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