RFR: JDK-8163581: Heap Parameters in HSDB cannot handle G1CollectedHeap

[Jini Susan George]

Thank you for this fix, Yasumasa. This issue was manifested through the 'universe' command in clhsdb also, and your change fixes that. It would be great if you could modify BasicLauncherTest.java to have some testing done for this also. 

Thank you, 
Jini (Not a Reviewer).

> -----Original Message-----
> From: David Holmes
> Sent: Thursday, August 11, 2016 10:03 AM
> To: Yasumasa Suenaga; serviceability-dev at openjdk.java.net; hotspot-gc-
> dev at openjdk.java.net
> Subject: Re: RFR: JDK-8163581: Heap Parameters in HSDB cannot handle
> G1CollectedHeap
> 
> Hi Yasumasa,
> 
> Adding in GC folk.
> 
> I agree with the need to override the printOn method, but can't comment
> on the details of what you are actually printing.
> 
> Thanks,
> David
> 
> On 10/08/2016 10:20 PM, Yasumasa Suenaga wrote:
> > Hi all,
> >
> > When I chose "Heap Parameters" menu in HSDB, I got following value:
> > --------------------
> > Heap Parameters:
> > unknown subtype of CollectedHeap @ 0x00007f4d4c030510
> > (0x00000006c6e00000,0x00000007c0000000)
> > --------------------
> >
> > I think it should not be "unknown subtype".
> >
> > This value is shown by sun.jvm.hotspot.gc.shared.CollectedHeap#printOn().
> > This method is overrided in ParallelScavengeHeap and GenCollectedHeap.
> > However, G1CollectedHeap does not override.
> >
> > I think G1CollectedHeap should override this method.
> >
> > I uploaded a webrev for this issue.
> > Could you review it?
> >
> >   http://cr.openjdk.java.net/~ysuenaga/JDK-8163581/webrev.00/
> >
> > I'm jdk 9 committer, but I cannot access JPRT.
> > So I need a sponsor.
> >
> >
> > Thanks,
> >
> > Yasumasa
> >