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6578152: fill_region_with_object has usability and safety issues

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Reviewed-by: apetrusenko, ysr
This commit is contained in:
John Coomes 2008-12-11 12:05:08 -08:00
parent 26f6b1692a
commit 000b184507
25 changed files with 261 additions and 198 deletions
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19
hotspot/src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp
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@ -1308,8 +1308,7 @@ void PSParallelCompact::fill_dense_prefix_end(SpaceId id)
}
#endif // #ifdef _LP64
MemRegion region(obj_beg, obj_len);
SharedHeap::fill_region_with_object(region);
gc_heap()->fill_with_object(obj_beg, obj_len);
_mark_bitmap.mark_obj(obj_beg, obj_len);
_summary_data.add_obj(obj_beg, obj_len);
assert(start_array(id) != NULL, "sanity");
@ -1807,9 +1806,14 @@ bool PSParallelCompact::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_po
// Fill the unused part of the old gen.
MutableSpace* const old_space = old_gen->object_space();
MemRegion old_gen_unused(old_space->top(), old_space->end());
if (!old_gen_unused.is_empty()) {
SharedHeap::fill_region_with_object(old_gen_unused);
HeapWord* const unused_start = old_space->top();
size_t const unused_words = pointer_delta(old_space->end(), unused_start);
if (unused_words > 0) {
if (unused_words < CollectedHeap::min_fill_size()) {
return false; // If the old gen cannot be filled, must give up.
}
CollectedHeap::fill_with_objects(unused_start, unused_words);
}
// Take the live data from eden and set both top and end in the old gen to
@ -1825,9 +1829,8 @@ bool PSParallelCompact::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_po
// Update the object start array for the filler object and the data from eden.
ObjectStartArray* const start_array = old_gen->start_array();
HeapWord* const start = old_gen_unused.start();
for (HeapWord* addr = start; addr < new_top; addr += oop(addr)->size()) {
start_array->allocate_block(addr);
for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) {
start_array->allocate_block(p);
}
// Could update the promoted average here, but it is not typically updated at