hs19 import

[Mark Wielaard]

On Tue, 2010-11-09 at 10:50 +0100, Mark Wielaard wrote:
> 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);

Ismael Juma pointed out on irc that the way it was disabled for hsx17
was with the following commit:
http://hg.openjdk.java.net/hsx/hsx17/master/rev/8e02b8f703b2