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6741004: UseLargePages + UseCompressedOops breaks implicit null checking guard page

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Turn off c2 implicit null checking on windows and large pages specified.

Reviewed-by: jrose, xlu
This commit is contained in:
Coleen Phillimore 2008-09-02 15:18:26 -04:00
parent 1d328ffab8
commit 83e7d32161
4 changed files with 16 additions and 9 deletions
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14
hotspot/src/share/vm/runtime/arguments.cpp
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@ -1204,15 +1204,17 @@ void Arguments::set_ergonomics_flags() {
// Turn off until bug is fixed.
// FLAG_SET_ERGO(bool, UseCompressedOops, true);
}
#ifdef _WIN64
if (UseLargePages && UseCompressedOops) {
// Cannot allocate guard pages for implicit checks in indexed addressing
// mode, when large pages are specified on windows.
FLAG_SET_DEFAULT(UseImplicitNullCheckForNarrowOop, false);
}
#endif // _WIN64
} else {
if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
// If specified, give a warning
if (UseConcMarkSweepGC){
warning("Compressed Oops does not work with CMS");
} else {
warning(
"Max heap size too large for Compressed Oops");
}
warning( "Max heap size too large for Compressed Oops");
FLAG_SET_DEFAULT(UseCompressedOops, false);
}
}