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/* | ||
* Copyright (c) 2023 SAP SE. All rights reserved. | ||
* Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved. | ||
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
* | ||
* This code is free software; you can redistribute it and/or modify it | ||
* under the terms of the GNU General Public License version 2 only, as | ||
* published by the Free Software Foundation. | ||
* | ||
* This code is distributed in the hope that it will be useful, but WITHOUT | ||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
* version 2 for more details (a copy is included in the LICENSE file that | ||
* accompanied this code). | ||
* | ||
* You should have received a copy of the GNU General Public License version | ||
* 2 along with this work; if not, write to the Free Software Foundation, | ||
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
* | ||
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
* or visit www.oracle.com if you need additional information or have any | ||
* questions. | ||
*/ | ||
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#include "precompiled.hpp" | ||
#include "runtime/os.hpp" | ||
#include "services/memTracker.hpp" | ||
#include "services/virtualMemoryTracker.hpp" | ||
#include "unittest.hpp" | ||
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static size_t get_committed() { | ||
VirtualMemorySnapshot snapshot; | ||
VirtualMemorySummary::snapshot(&snapshot); | ||
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return snapshot.by_type(mtThreadStack)->committed(); | ||
} | ||
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TEST_VM(VirtualMemoryTracker, MissingRemoveReleasedRegion) { | ||
if (!MemTracker::enabled()) { | ||
return; | ||
} | ||
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// Simulate the case where we miss the ending of a thread. | ||
for (int i = 100; i >= 0; --i) { | ||
size_t size = 1024 * 1024; | ||
NativeCallStack empty_stack; | ||
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// Get a region of mapped memory not tracked by the virtual memory tracker. | ||
address base = (address) os::reserve_memory(2 * size, false); | ||
VirtualMemoryTracker::remove_released_region(base, 2 * size); | ||
size_t init_sz = get_committed(); | ||
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// Reserve and commit everything. We have to, since getting the snapshot 'detects' | ||
// committed but not reported memory for thread stacks and the detection will not work | ||
// on MacOSX (not implemented). | ||
VirtualMemoryTracker::add_reserved_region(base, size, empty_stack, mtThreadStack); | ||
VirtualMemoryTracker::add_committed_region(base, size, empty_stack); | ||
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// Now pretend we have forgotten to call remove_released_region and allocate an new | ||
// overlapping region with some commited memory. | ||
VirtualMemoryTracker::add_reserved_region(base + size / 2, size, empty_stack, mtThreadStack); | ||
VirtualMemoryTracker::add_committed_region(base + size / 2, size, empty_stack); | ||
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// And remove some of the the committed memory again by reserving a partially overlappinbg region. | ||
VirtualMemoryTracker::add_reserved_region(base, size, empty_stack, mtThreadStack); | ||
VirtualMemoryTracker::add_committed_region(base, size, empty_stack); | ||
size_t new_sz = get_committed(); | ||
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// Give back the memory. | ||
VirtualMemoryTracker::remove_released_region(base, size); | ||
VirtualMemoryTracker::add_reserved_region(base, 2 * size, empty_stack, mtThreadStack); | ||
os::release_memory((char*) base, 2 * size); | ||
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// If a parallel thread committed memory concurrently, we get a wrong test result. | ||
// This should not happen often, so try a few times. | ||
if (new_sz - size == init_sz) { | ||
break; | ||
} | ||
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// If it fails too often log the values we see. | ||
if (i < 50) { | ||
tty->print_cr("init_sz: %d, new_sz %d, diff %d, region_size %d", (int) init_sz, (int) new_sz, (int) (new_sz - init_sz), (int) size); | ||
} | ||
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// Trigger a test failure on the last run. | ||
if (i == 0) { | ||
EXPECT_TRUE(new_sz - size == init_sz) << "new_sz: " << new_sz << ", init_sz: " << init_sz << | ||
", diff: " << (new_sz - init_sz) << ", region size: " << size; | ||
} | ||
} | ||
} |