RFR: 8238665: Add JFR event for direct memory statistics

Alan Bateman Alan.Bateman at oracle.com
Thu Mar 5 08:46:08 UTC 2020

On 05/03/2020 02:44, Denghui Dong wrote:
> Hi Erik,
> Updated.
> Webrev: http://cr.openjdk.java.net/~ddong/8238665/webrev.01/
ManagementFactoryHelper has a method to get the list of MXBeans for the 
buffer pools. That could be easily changed to return an unmodifable 
list. That would allow you to emit statistics for memory-mapped files 
too (the current patch seems to be limited to emitting stats for direct 


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