[10] RFR (M/L): 8137099: G1 needs to "upgrade" GC within the safepoint if it can't allocate during that safepoint to avoid OoME

[Thomas Schatzl]

Hi again,

On Tue, 2018-01-09 at 10:52 +0100, Thomas Schatzl wrote:
> Hi all,
> 
>   Erik Duveblad had some offline comments:
> 
> New webrevs:
> http://cr.openjdk.java.net/~tschatzl/8137099/webrev.2_to_3/ (diff)
> http://cr.openjdk.java.net/~tschatzl/8137099/webrev.3/ (full)
> 
> - inverting some conditions in the clauses to read better
> 
> - extract out the condition to do the maximally compacting full gc
> added in this change into a separate method.
> 
> Erik Duveblad also noted that this change contains some slight
> behavioral change in when a collection is started. I.e. previously
> TLAB allocation by itself could not cause a GC. Since this change is
> already quite big, he suggested to fix this in a follow-up, and push
> them together.

  additionally we agreed to retarget both changes to 11 to let it bake
a bit.

Thanks,
  Thomas