RFR: 8261441: JFR: Filename expansion [v5]

[Denghui Dong]

On Wed, 23 Jun 2021 03:17:36 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

>> Denghui Dong has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   null check
>
> Why is not `%t` useful? 
> 
> If you start multiple processes, the same PID can be reused and cause a collision.

@egahlin 
Thank you very much for helping to refine the content of CSR.
I have updated the corresponding man page.

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PR: https://git.openjdk.java.net/jdk/pull/4550