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

[Jie Kang]

On Wed, 22 Jan 2020 18:45:38 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>>> Hi Jie!
>>> 
>>> How about hiding the count column, or even removing it? I believe this is the event count for both of the TLAB events - it does not correspond to the number of actual objects allocated. We could perhaps estimate the number of allocated objects (using the size of the allocated object inside tlab and the tlab size) and add that as a new column, with a proper description, but the total event count doesn't really make sense. Now that we have the percentages, we may want to instead have the backdrop bars on them.
>>> 
>>> Also, how about hiding the average columns by default? There is a bit of information overload right now, and I think the sums may be what people will usually want. They can show the other columns if they need them.
>> 
>> I agree with your suggestions. I've removed the count column and hidden the average columns by default. I am currently working on the backdrop bars. It's a bit more complicated than I had initially hoped.
>> 
>> I think an estimated count of number of objects allocated could be useful. I can also try to add this here, but I think it's extending a little more past the issue contents. Is it acceptable if I open another issue in JIRA to address this?
> 
>> 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

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