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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes

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Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv

Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
This commit is contained in:
Coleen Phillimore 2008-04-13 17:43:42 -04:00
parent 680ecf1611
commit 4a831d45f0
273 changed files with 6585 additions and 2993 deletions
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13
hotspot/src/share/vm/gc_implementation/parallelScavenge/prefetchQueue.hpp
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@ -33,8 +33,8 @@ const int PREFETCH_QUEUE_SIZE = 8;
class PrefetchQueue : public CHeapObj {
private:
oop* _prefetch_queue[PREFETCH_QUEUE_SIZE];
unsigned int _prefetch_index;
void* _prefetch_queue[PREFETCH_QUEUE_SIZE];
uint _prefetch_index;
public:
int length() { return PREFETCH_QUEUE_SIZE; }
@ -46,20 +46,21 @@ class PrefetchQueue : public CHeapObj {
_prefetch_index = 0;
}
inline oop* push_and_pop(oop* p) {
Prefetch::write((*p)->mark_addr(), 0);
template <class T> inline void* push_and_pop(T* p) {
oop o = oopDesc::load_decode_heap_oop_not_null(p);
Prefetch::write(o->mark_addr(), 0);
// This prefetch is intended to make sure the size field of array
// oops is in cache. It assumes the the object layout is
// mark -> klass -> size, and that mark and klass are heapword
// sized. If this should change, this prefetch will need updating!
Prefetch::write((*p)->mark_addr() + (HeapWordSize*2), 0);
Prefetch::write(o->mark_addr() + (HeapWordSize*2), 0);
_prefetch_queue[_prefetch_index++] = p;
_prefetch_index &= (PREFETCH_QUEUE_SIZE-1);
return _prefetch_queue[_prefetch_index];
}
// Stores a NULL pointer in the pop'd location.
inline oop* pop() {
inline void* pop() {
_prefetch_queue[_prefetch_index++] = NULL;
_prefetch_index &= (PREFETCH_QUEUE_SIZE-1);
return _prefetch_queue[_prefetch_index];