RFR: 8238665: Add JFR event for direct memory statistics

[Alan Bateman]

On 08/03/2020 15:42, Denghui Dong wrote:
> Hi Alan and Erik,
>
> Thanks for the review.
>
> Webrev has been updated in http://cr.openjdk.java.net/~ddong/8238665/webrev.02/
>
Can you trying moving JavaNioAccess.BufferPool to VM? I think that would 
help clean this up a bit and avoid having jdk.internal.access types 
leaking through the jdk.internal.misc.VM interface.

-Alan.