hs19 import

[Mark Wielaard]

On Wed, 2010-11-03 at 17:41 +0000, Dr Andrew John Hughes wrote:
> On 14:04 Tue 02 Nov     , Erik Trimble wrote:
> > On 11/2/2010 1:02 PM, Mark Wielaard wrote:
> > > Do you think the changes between b06 and b09 should go into the openjdk6
> > > hotspot (for openjdk6-b21) or would it be better not to for now?
> > >
> > I'll re-check, but I think it may have been a simple oversight on my 
>
> With both the master and baseline versions of hs19, we are hitting this bug:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=647737
> 
> This really needs to be fixed before we can release OpenJDK6 b21 with HotSpot 19.

So for those not having tracked that bug report, it turned out to have
been caused by compressed oops being on by default now. The easiest
workaround is something like this patch:

--- openjdk/hotspot/src/share/vm/runtime/arguments.cpp.sav    2010-11-08 23:50:59.000000000 -0500
+++ openjdk/hotspot/src/share/vm/runtime/arguments.cpp        2010-11-08 23:52:53.000000000 -0500
@@ -1301,7 +1301,8 @@ void Arguments::set_ergonomics_flags() {
   if (MaxHeapSize <= max_heap_for_compressed_oops()) {
 #ifndef COMPILER1
     if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
-      FLAG_SET_ERGO(bool, UseCompressedOops, true);
+      // Temporarily fix rhbz#647737 -- disable compressed oops by default
+      //FLAG_SET_ERGO(bool, UseCompressedOops, true);