RFR (S): 7127700: G1: Replace G1PLAB with PLAB

[Kim Barrett]

> On Feb 12, 2018, at 10:21 AM, Stefan Johansson <stefan.johansson at oracle.com> wrote:
> 
> Hi Thomas,
> 
> On 2018-02-12 10:30, Thomas Schatzl wrote:
>> Hi all,
>> 
>>   can I have reviews for this small change that removes G1PLAB and uses
>> the PLAB class throughout?
>> 
>> Although the CR indicates that the remaining _retired member of G1PLAB
>> might be useful, I think the additional check it provides is not worth
>> the effort, so I removed it.
>> 
>> CR:
>> https://bugs.openjdk.java.net/browse/JDK-7127700
>> Webrev:
>> http://cr.openjdk.java.net/~tschatzl/7127700/webrev/
> Looks good, just one thing. Please remove the virtual declarations from PLAB in plab.hpp.
> 
> I have no strong opinion regarding keeping _retired, but if no one else see a strong reason for having it let's remove it.

I agree with Stefan — looks good except for the lingering virtuals.

> Thanks,
> Stefan
> 
>> Testing:
>> hs-tier 1-5
>> 
>> P.S: there is an alternate webrev at http://cr.openjdk.java.net/~tschat
>> zl/7127700/webrev.alt that keeps the _retired flag and moves it to the
>> PLAB class. If you think this is better, we can also use this for
>> pushing. I am tending to just removing it.
>> 
>> Thanks,
>>   Thomas