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This commit is contained in:
Jon Masamitsu 2010-11-15 16:25:14 -08:00
commit fbe476856f
2 changed files with 12 additions and 4 deletions
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12
hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp
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@ -1093,7 +1093,8 @@ bool CompactibleFreeListSpace::block_is_obj(const HeapWord* p) const {
// perm_gen_verify_bit_map where we store the "deadness" information if
// we did not sweep the perm gen in the most recent previous GC cycle.
bool CompactibleFreeListSpace::obj_is_alive(const HeapWord* p) const {
assert (block_is_obj(p), "The address should point to an object");
assert(block_is_obj(p), "The address should point to an object");
assert(SafepointSynchronize::is_at_safepoint(), "Else races are possible");
// If we're sweeping, we use object liveness information from the main bit map
// for both perm gen and old gen.
@ -1102,9 +1103,14 @@ bool CompactibleFreeListSpace::obj_is_alive(const HeapWord* p) const {
// main marking bit map (live_map below) is locked,
// OR we're in other phases and perm_gen_verify_bit_map (dead_map below)
// is stable, because it's mutated only in the sweeping phase.
// NOTE: This method is also used by jmap where, if class unloading is
// off, the results can return "false" for legitimate perm objects,
// when we are not in the midst of a sweeping phase, which can result
// in jmap not reporting certain perm gen objects. This will be moot
// if/when the perm gen goes away in the future.
if (_collector->abstract_state() == CMSCollector::Sweeping) {
CMSBitMap* live_map = _collector->markBitMap();
return live_map->isMarked((HeapWord*) p);
return live_map->par_isMarked((HeapWord*) p);
} else {
// If we're not currently sweeping and we haven't swept the perm gen in
// the previous concurrent cycle then we may have dead but unswept objects
@ -2266,7 +2272,7 @@ void CompactibleFreeListSpace::split(size_t from, size_t to1) {
}
void CompactibleFreeListSpace::print() const {
Space::print_on(tty);
print_on(tty);
}
void CompactibleFreeListSpace::prepare_for_verify() {