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

[Jie Kang]

On Tue, 3 Mar 2020 13:31:42 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> ![image](https://user-images.githubusercontent.com/16906077/75707067-8994e680-5cbe-11ea-81d1-cfe46b5c4388.png)
>> 
>> I've been thinking of how we can make the naming clearer. What do you think about:
>> 
>> * Avg Alloc in TLABs
>> * Avg Alloc Outside TLABs
>> * Total Alloc in TLABs
>> * Total Alloc Outside TLABs
>> 
>> Reasoning:
>> * Just saying Avg. TLAB Alloc can be confusing - it's not the TLAB allocation but rather the estimated size of allocations in the TLAB, on average. Also rhymes better with Avg Alloc Outside TLABs. We do explain that it is an estimate in the tooltip, so perhaps we can skip it in the name. We should either have it in both of the inside TLAB columns, or in none of them. 
>> * I think we can probably drop the contraction periods, but if someone disagrees I don't mind.
>
> Noted that I hadn't cleared my settings. This is how things look right now:
> ![image](https://user-images.githubusercontent.com/16906077/75779976-ed6ced00-5d5a-11ea-9278-8e317d419d00.png)
> 
> So, it becomes:
> * Alloc in TLABs
> * Alloc in TLABs (%)
> * Alloc Outside TLABs
> * Alloc Outside TLABs (%)
> 
> With the hidden ones e.g. being:
> * Avg Alloc in TLABs
> * Avg Alloc Outside TLABs
> 
> What do you think?

I agree with the naming suggestions and have updated the PR with a commit to match them, rebasing onto latest upstream as well.

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