RFR: 8077836: Make sure G1ParGCAllocBuffer are marked as retired

[Per Liden]

Hi Stefan,

On 2015-04-15 15:08, Stefan Johansson wrote:
> Hi,
>
> Please review this fix for:
> https://bugs.openjdk.java.net/browse/JDK-8077836
>
> Webrev:
> http://cr.openjdk.java.net/~sjohanss/8077836/hotspot.00/
>
> Summary:
> At the end of a G1 gc a call to G1ParGCAllocator::retire_alloc_buffers
> is made, in this code we should make sure all alloc buffers are retired.
> This is currently handle by calling flush_and_retire_stats for each
> active buffer. Because this method is only implemented for
> ParGCAllocBuffer and not for G1ParGCAllocBuffer we currently miss
> updating the _retired field in G1ParGCAllocBuffer.
>
> The _retired field is checked in a guarantee in the G1ParGCAllocBuffer
> destructor, but this destructor is not usually called because we are
> missing a virtual destructor for G1ParGCAllocator.
>
> This patch adds this destructor and implements
> G1ParGCAllocBuffer::flush_and_retire_stats by calling the version in
> ParGCAllocBuffer and setting the _retired field to true.

Change looks good.

Just one question, would it make sense to remove G1ParGCAllocator and 
move the _retired check into ParGCAllocator?

/Per