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8038423: G1: Decommit memory within heap

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Allow G1 to decommit memory of arbitrary regions within the heap and their associated auxiliary data structures card table, BOT, hot card cache, and mark bitmaps.

Reviewed-by: mgerdin, brutisso, jwilhelm
This commit is contained in:
Thomas Schatzl 2014-08-19 14:09:10 +02:00
parent 2617d54723
commit 100e51a339
32 changed files with 1322 additions and 579 deletions
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38
hotspot/src/share/vm/gc_implementation/g1/heapRegionSet.cpp
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@ -403,3 +403,41 @@ void HumongousRegionSetMtSafeChecker::check() {
"master humongous set MT safety protocol outside a safepoint");
}
}
void FreeRegionList_test() {
FreeRegionList l("test");
const uint num_regions_in_test = 5;
// Create a fake heap. It does not need to be valid, as the HeapRegion constructor
// does not access it.
MemRegion heap(NULL, num_regions_in_test * HeapRegion::GrainWords);
// Allocate a fake BOT because the HeapRegion constructor initializes
// the BOT.
size_t bot_size = G1BlockOffsetSharedArray::compute_size(heap.word_size());
HeapWord* bot_data = NEW_C_HEAP_ARRAY(HeapWord, bot_size, mtGC);
ReservedSpace bot_rs(G1BlockOffsetSharedArray::compute_size(heap.word_size()));
G1RegionToSpaceMapper* bot_storage =
G1RegionToSpaceMapper::create_mapper(bot_rs,
os::vm_page_size(),
HeapRegion::GrainBytes,
G1BlockOffsetSharedArray::N_bytes,
mtGC);
G1BlockOffsetSharedArray oa(heap, bot_storage);
bot_storage->commit_regions(0, num_regions_in_test);
HeapRegion hr0(0, &oa, heap);
HeapRegion hr1(1, &oa, heap);
HeapRegion hr2(2, &oa, heap);
HeapRegion hr3(3, &oa, heap);
HeapRegion hr4(4, &oa, heap);
l.add_ordered(&hr1);
l.add_ordered(&hr0);
l.add_ordered(&hr3);
l.add_ordered(&hr4);
l.add_ordered(&hr2);
assert(l.length() == num_regions_in_test, "wrong length");
l.verify_list();
bot_storage->uncommit_regions(0, num_regions_in_test);
delete bot_storage;
FREE_C_HEAP_ARRAY(HeapWord, bot_data, mtGC);
}