Request for review - 7197557

[Jon Masamitsu]

I have one review (Thanks JohnCu).  The change is straight forward
but it is code that has problems in the past (GC_locker code) so any
other reviews would be welcome.

Jon

On 09/16/12 20:09, Jon Masamitsu wrote:
> NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
>
> The code that was doing a GC to find dead class loaders so that metadata
> could be freed does not correctly account for GC_locker activity 
> (i.e., use
> of JNI critical sections which stall GC).  Added code to recognize if
> a GC_locker is active and expand the Metaspace and allocate out of the
> expanded area.  If the expansion cannot provide metadata, wait for
> the GC_locker to inactivate so that a GC can be done.
>
> http://cr.openjdk.java.net/~jmasa/7197557/webrev.00/
>
> Note that there are three places in the different GC's that need to
> account for GC_locker activity.  I am investigating whether this
> code can be unified.