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6791178: Specialize for zero as the compressed oop vm heap base

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Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb.

Reviewed-by: never, twisti, jcoomes, coleenp
This commit is contained in:
Vladimir Kozlov 2009-03-12 10:37:46 -07:00
parent 66cecec230
commit 69f9ddee90
45 changed files with 1072 additions and 220 deletions
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6
hotspot/src/share/vm/runtime/virtualspace.hpp
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@ -73,7 +73,8 @@ class ReservedSpace VALUE_OBJ_CLASS_SPEC {
const size_t noaccess_prefix = 0);
ReservedSpace(const size_t prefix_size, const size_t prefix_align,
const size_t suffix_size, const size_t suffix_align,
const size_t noaccess_prefix);
char* requested_address,
const size_t noaccess_prefix = 0);
// Accessors
char* base() const { return _base; }
@ -121,7 +122,8 @@ public:
ReservedHeapSpace(size_t size, size_t forced_base_alignment,
bool large, char* requested_address);
ReservedHeapSpace(const size_t prefix_size, const size_t prefix_align,
const size_t suffix_size, const size_t suffix_align);
const size_t suffix_size, const size_t suffix_align,
char* requested_address);
};
// VirtualSpace is data structure for committing a previously reserved address range in smaller chunks.