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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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2
hotspot/src/share/vm/runtime/os.hpp
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@ -243,7 +243,7 @@ class os: AllStatic {
static char* non_memory_address_word();
// reserve, commit and pin the entire memory region
static char* reserve_memory_special(size_t size);
static char* reserve_memory_special(size_t size, char* addr = NULL);
static bool release_memory_special(char* addr, size_t bytes);
static bool large_page_init();
static size_t large_page_size();