RFR: JDK-8268893: jcmd to trim the glibc heap [v2]

[Thomas Stuefe]

On Mon, 21 Jun 2021 09:15:05 GMT, Volker Simonis <simonis at openjdk.org> wrote:

> I like this little new diagnostic command which I think can be quite useful in specific situations.
> 

Thanks a lot Volker!

> However, in contrast to other reviewers, I'd rather keep this simple and Glibc specific instead of extending it to a more general but mostly empty command.

Yes, that was my thought too. Lets wait for @dholmes-ora to chime in, whether we can all agree on a glibc specific variant. I also preferred that one. 

> 
> I'd therefore propose to rename this command to `glibc_trim_heap` to make it evident from the command name already that it is Glibc-specific.
> 
> Besides that, just cosmetic changes and suggestions.

All of which make sense, I'll work them in.

Thanks!

..Thomas

-------------

PR: https://git.openjdk.java.net/jdk/pull/4510