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8024927: Nashorn performance regression with CompressedOops

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Allocate compressed class space at end of Java heap.  For small heap sizes, without CDS, save some space so compressed classes can have the same favorable compression as oops

Reviewed-by: stefank, hseigel, goetz
This commit is contained in:
Coleen Phillimore 2013-10-25 15:19:29 -04:00
parent 4e192289d4
commit 3e6630c07b
8 changed files with 295 additions and 95 deletions
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2
hotspot/src/share/vm/utilities/globalDefinitions.hpp
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@ -368,8 +368,6 @@ const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize;
// Klass encoding metaspace max size
const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes;
const jlong CompressedKlassPointersBase = NOT_LP64(0) LP64_ONLY(CONST64(0x800000000)); // 32*G
// Machine dependent stuff
#ifdef TARGET_ARCH_x86