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Issue 2101383002: [heap] Reland uncommit unused large object page memory. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 4 years, 5 months ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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6784 isolate_is_locked); 6784 isolate_is_locked);
6785 int mark_sweep_count_after = heap->ms_count(); 6785 int mark_sweep_count_after = heap->ms_count();
6786 int mark_sweeps_performed = mark_sweep_count_after - mark_sweep_count_before; 6786 int mark_sweeps_performed = mark_sweep_count_after - mark_sweep_count_before;
6787 // The memory pressuer handler either performed two GCs or performed one and 6787 // The memory pressuer handler either performed two GCs or performed one and
6788 // started incremental marking. 6788 // started incremental marking.
6789 CHECK(mark_sweeps_performed == 2 || 6789 CHECK(mark_sweeps_performed == 2 ||
6790 (mark_sweeps_performed == 1 && 6790 (mark_sweeps_performed == 1 &&
6791 !heap->incremental_marking()->IsStopped())); 6791 !heap->incremental_marking()->IsStopped()));
6792 } 6792 }
6793 6793
6794 TEST(UncommitUnusedLargeObjectMemory) {
6795 CcTest::InitializeVM();
6796 v8::HandleScope scope(CcTest::isolate());
6797 Heap* heap = CcTest::heap();
6798 Isolate* isolate = heap->isolate();
6799
6800 Handle<FixedArray> array = isolate->factory()->NewFixedArray(200000);
6801 MemoryChunk* chunk = MemoryChunk::FromAddress(array->address());
6802 CHECK(chunk->owner()->identity() == LO_SPACE);
6803
6804 intptr_t size_before = array->Size();
6805 size_t committed_memory_before = chunk->CommittedPhysicalMemory();
6806
6807 array->Shrink(1);
6808 CHECK(array->Size() < size_before);
6809
6810 CcTest::heap()->CollectAllGarbage();
6811 CHECK(chunk->CommittedPhysicalMemory() < committed_memory_before);
6812 size_t shrinked_size =
6813 RoundUp((array->address() - chunk->address()) + array->Size(),
6814 base::OS::CommitPageSize());
6815 CHECK_EQ(shrinked_size, chunk->CommittedPhysicalMemory());
6816 }
6794 } // namespace internal 6817 } // namespace internal
6795 } // namespace v8 6818 } // namespace v8
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