RFR: 6657: Add allocation pressure column to Memory and TLAB views

[Jie Kang]

On Wed, 22 Jan 2020 21:29:28 GMT, Jie Kang <jkang at openjdk.org> wrote:

>>> Is it acceptable if I open another issue in JIRA to address this?
>> 
>> Certainly!
> 
>> > Is it acceptable if I open another issue in JIRA to address this?
>> 
>> Certainly!
> 
> Created @ https://bugs.openjdk.java.net/browse/JMC-6678

@thegreystone Hey Marcus, the latest commit adds the backdrop bars, and the entire chain of commits in the PR is rebased on top of master commit 6dd19dd5ae3fc4c7e7bfc1e997725408188dbb79

I'm still trying to think of ways to clean up the code for backdrop bars: looking at the unit infrastructure to see how to extract the column value without needing to divide by 100, if possible, and just the addition of the code straight into the addPercentageColumn code is a bit crude and not so extensible. It works as far as I can tell, at the least.

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PR: https://git.openjdk.java.net/jmc/pull/21