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8072434: 8064457: introduces performance regressions in 9-b47

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Reviewed-by: coleenp, kvn
This commit is contained in:
Goetz Lindenmaier 2015-02-04 16:26:38 +01:00
parent 483815ed11
commit 3a8d0b8ce0
1 changed files with 3 additions and 2 deletions
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5
hotspot/src/share/vm/runtime/virtualspace.cpp
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@ -503,11 +503,12 @@ void ReservedHeapSpace::initialize_compressed_heap(const size_t size, size_t ali
// But leave room for the compressed class pointers, which is allocated above
// the heap.
char *zerobased_max = (char *)OopEncodingHeapMax;
const size_t class_space = align_size_up(CompressedClassSpaceSize, alignment);
// For small heaps, save some space for compressed class pointer
// space so it can be decoded with no base.
if (UseCompressedClassPointers && !UseSharedSpaces &&
OopEncodingHeapMax <= KlassEncodingMetaspaceMax) {
const size_t class_space = align_size_up(CompressedClassSpaceSize, alignment);
OopEncodingHeapMax <= KlassEncodingMetaspaceMax &&
(uint64_t)(aligned_heap_base_min_address + size + class_space) <= KlassEncodingMetaspaceMax) {
zerobased_max = (char *)OopEncodingHeapMax - class_space;
}