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7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end

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What the synopsis says.

Reviewed-by: jwilhelm, iveresov, johnc
This commit is contained in:
Antonios Printezis 2011-03-29 22:36:16 -04:00
parent c2275649b7
commit 349d820dd1
5 changed files with 69 additions and 4 deletions
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39
hotspot/src/share/vm/gc_implementation/g1/heapRegionSet.cpp
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@ -261,6 +261,45 @@ void HeapRegionLinkedList::fill_in_ext_msg_extra(hrs_ext_msg* msg) {
msg->append(" hd: "PTR_FORMAT" tl: "PTR_FORMAT, head(), tail());
}
void HeapRegionLinkedList::add_as_head(HeapRegionLinkedList* from_list) {
hrs_assert_mt_safety_ok(this);
hrs_assert_mt_safety_ok(from_list);
verify_optional();
from_list->verify_optional();
if (from_list->is_empty()) return;
#ifdef ASSERT
HeapRegionLinkedListIterator iter(from_list);
while (iter.more_available()) {
HeapRegion* hr = iter.get_next();
// In set_containing_set() we check that we either set the value
// from NULL to non-NULL or vice versa to catch bugs. So, we have
// to NULL it first before setting it to the value.
hr->set_containing_set(NULL);
hr->set_containing_set(this);
}
#endif // ASSERT
if (_head != NULL) {
assert(length() > 0 && _tail != NULL, hrs_ext_msg(this, "invariant"));
from_list->_tail->set_next(_head);
} else {
assert(length() == 0 && _head == NULL, hrs_ext_msg(this, "invariant"));
_tail = from_list->_tail;
}
_head = from_list->_head;
_length += from_list->length();
_region_num += from_list->region_num();
_total_used_bytes += from_list->total_used_bytes();
from_list->clear();
verify_optional();
from_list->verify_optional();
}
void HeapRegionLinkedList::add_as_tail(HeapRegionLinkedList* from_list) {
hrs_assert_mt_safety_ok(this);
hrs_assert_mt_safety_ok(from_list);