RFR: 8238665: Add JFR event for direct memory statistics

[Alan Bateman]

On 31/03/2020 17:22, Denghui Dong wrote:
> Hi Erik,
>
> IMO, one event type per pool is a better choice, because:
> 1. easy filtering and configuration as you said, and I don't think there will be too many buffer pool types in the future
> 2. some buffer pools may have extra fields, e.g. direct memory has max capacity limit.
>
> webrev: http://cr.openjdk.java.net/~ddong/8238665/webrev.05/
> diff with webrev.04: http://cr.openjdk.java.net/~ddong/8238665/v4-v5.diff
>
>
This update looks good to me too.

Erik, are you okay to sponsor this one?