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6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb

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Added new product ObjectAlignmentInBytes flag to control object alignment.

Reviewed-by: twisti, ysr, iveresov
This commit is contained in:
Vladimir Kozlov 2010-05-27 18:01:56 -07:00
parent 05b4f2e796
commit cc18a50e59
29 changed files with 222 additions and 136 deletions
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8
hotspot/src/share/vm/memory/space.cpp
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@ -861,9 +861,9 @@ void ContiguousSpace::allocate_temporary_filler(int factor) {
}
size = align_object_size(size);
const size_t min_int_array_size = typeArrayOopDesc::header_size(T_INT);
if (size >= min_int_array_size) {
size_t length = (size - min_int_array_size) * (HeapWordSize / sizeof(jint));
const size_t array_header_size = typeArrayOopDesc::header_size(T_INT);
if (size >= (size_t)align_object_size(array_header_size)) {
size_t length = (size - array_header_size) * (HeapWordSize / sizeof(jint));
// allocate uninitialized int array
typeArrayOop t = (typeArrayOop) allocate(size);
assert(t != NULL, "allocation should succeed");
@ -871,7 +871,7 @@ void ContiguousSpace::allocate_temporary_filler(int factor) {
t->set_klass(Universe::intArrayKlassObj());
t->set_length((int)length);
} else {
assert((int) size == instanceOopDesc::header_size(),
assert(size == CollectedHeap::min_fill_size(),
"size for smallest fake object doesn't match");
instanceOop obj = (instanceOop) allocate(size);
obj->set_mark(markOopDesc::prototype());