RFR: 8255001: Move G1PeriodicGCTask to its own file [v2]

[Thomas Schatzl]

On Fri, 27 Nov 2020 09:23:09 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

>> After making the service thread task based it is now possible to move the tasks out of `g1ServiceThread.cpp`. The periodic task is moved to its own files and the initialization and registration with the service thread is done while initializing `G1CollectedHeap`.
>> 
>> No functionality is changed for the task, but it has been split up into a header and a source file. 
>> 
>> **Testing**
>> tier 1-2 + manual testing setting `G1PeriodicGCInterval` through `jcmd`.
>
> Stefan Johansson has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:
> 
>  - Merge branch 'master' into 8255001-move-periodic-gc-task
>  - 8255001: Move G1PeriodicGCTask to its own file

Changes requested by tschatzl (Reviewer).

src/hotspot/share/gc/g1/g1PeriodicGCTask.hpp line 31:

> 29: #include "utilities/globalDefinitions.hpp"
> 30: #include "utilities/ticks.hpp"
> 31: 

Only the g1ServiceThread include seems to be required here. The others can be moved to the cpp file.

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PR: https://git.openjdk.java.net/jdk/pull/1471