RFR: Backport PLAB stuff to shenandoah/jdk10

[Roman Kennke]

Am 31.05.2018 um 15:24 schrieb Aleksey Shipilev:
> On 05/31/2018 03:11 PM, Roman Kennke wrote:
>> http://cr.openjdk.java.net/~rkennke/backport-plabs/webrev.01/
> 
> *) Please fold all three changesets into one "[backport] Use PLAB for evacuations instead of TLAB",
> this would simplify the further backports
> 
> *) In thread.hpp, there is forward decl for PLAB:
> 
>   94 #ifdef INCLUDE_ALL_GCS
>   95 class PLAB;
>   96 #endif
> 
> ...but the usages are not guarded by INCLUDE_ALL_GCS:
> 
>  328   PLAB*                  _gclab;                // Thread-local allocation buffer for GC (e.g.
> evacuation)
> 
>  ...
> 
>  517   PLAB* gclab()                                  { return _gclab; }
>  518   void set_gclab(PLAB* gclab)                    { _gclab = gclab; }
> 
> Otherwise looks good, thanks!
> 

Like this?

Differential:
http://cr.openjdk.java.net/~rkennke/backport-plabs/webrev.02.diff/
Full:
http://cr.openjdk.java.net/~rkennke/backport-plabs/webrev.02/

Roman