RFR(S) 8154745: Move default G1 pause time target setup to argument parsing

[Stefan Johansson]

On 2016-04-20 14:32, Mikael Gerdin wrote:
> Hi all,
>
> Please review this fairly small change to move even more code out of 
> G1CollectorPolicy.
> The policy has previously initialized and validated MaxGCPauseMillis 
> and GCPauseIntervalMillis in its constructor.
>
> This should be moved to Arguments::set_g1_gc_flags, where other 
> default values of globally known flags are set.
> We can then move the constraint checking to the proper command line 
> flag constraint functions (pause interval > pause target and setting 
> pause interval without setting pause target) and modify the 
> constraints so that they are applied before the GC subsystem is 
> initialized (by changing AfterMemorInit to AfterErgo)
>
> I also took the liberty to correct the comment I copied to correctly 
> state that we set up the pause interval based on the pause time 
> target, not the other way around.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8154745
> Webrev: http://cr.openjdk.java.net/~mgerdin/8154745/webrev.0
Looks good,
StefanJ
> Testing: RBT GC Testing
>
> /Mikael