Sorry folks--the webrev url: 
http://cr.openjdk.java.net/~mduigou/6565585/0/webrev/

Mike

On Mar 17 2011, at 15:07 , Mike Duigou wrote:

> Method.invoke(), Contrstuctor.newInstance() and Field.getFieldAccessor() all 
> have a needless critical section, causing large slowdowns. This patch a 
> replaces the synchronizations by volatile references. Finally, the changes 
> remove a doubled reference to another volatile variable.  This also 
> simplifies the generated code by commoning up the corresponding load 
> instruction used in the fast execution path. 
> 
> Speedups from this change are uniformly 2x or better.
> 
> The proposed improvement and patch was originated by John Rose.
> 
> Thanks,
> 
> Mike

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