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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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12
hotspot/src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp
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@ -711,6 +711,7 @@ HeapWord* ParallelCompactData::calc_new_pointer(HeapWord* addr) {
// object in the region.
if (region_ptr->data_size() == RegionSize) {
result += pointer_delta(addr, region_addr);
DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result);)
return result;
}
@ -1487,13 +1488,14 @@ PSParallelCompact::provoke_split_fill_survivor(SpaceId id)
space->set_top_for_allocations();
}
size_t obj_len = 8;
size_t min_size = CollectedHeap::min_fill_size();
size_t obj_len = min_size;
while (b + obj_len <= t) {
CollectedHeap::fill_with_object(b, obj_len);
mark_bitmap()->mark_obj(b, obj_len);
summary_data().add_obj(b, obj_len);
b += obj_len;
obj_len = (obj_len & 0x18) + 8; // 8 16 24 32 8 16 24 32 ...
obj_len = (obj_len & (min_size*3)) + min_size; // 8 16 24 32 8 16 24 32 ...
}
if (b < t) {
// The loop didn't completely fill to t (top); adjust top downward.
@ -1680,11 +1682,13 @@ void PSParallelCompact::fill_dense_prefix_end(SpaceId id)
// +-------+
// Initially assume case a, c or e will apply.
size_t obj_len = (size_t)oopDesc::header_size();
size_t obj_len = CollectedHeap::min_fill_size();
HeapWord* obj_beg = dense_prefix_end - obj_len;
#ifdef _LP64
if (_mark_bitmap.is_obj_end(dense_prefix_bit - 2)) {
if (MinObjAlignment > 1) { // object alignment > heap word size
// Cases a, c or e.
} else if (_mark_bitmap.is_obj_end(dense_prefix_bit - 2)) {
// Case b above.
obj_beg = dense_prefix_end - 1;
} else if (!_mark_bitmap.is_obj_end(dense_prefix_bit - 3) &&