/
chunkHeaderPool.cpp
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/
chunkHeaderPool.cpp
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/*
* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2020 SAP SE. 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.
*
*/
#include "precompiled.hpp"
#include "memory/metaspace/chunkHeaderPool.hpp"
#include "runtime/os.hpp"
#include "utilities/debug.hpp"
#include "utilities/globalDefinitions.hpp"
namespace metaspace {
// Returns reference to the one global chunk header pool.
ChunkHeaderPool* ChunkHeaderPool::_chunkHeaderPool = NULL;
ChunkHeaderPool::ChunkHeaderPool()
: _num_slabs(), _first_slab(NULL), _current_slab(NULL)
{
}
// Note: the global chunk header pool gets never deleted; so this destructor only
// exists for the sake of tests.
ChunkHeaderPool::~ChunkHeaderPool() {
Slab* s = _first_slab;
while (s != NULL) {
Slab* next_slab = s->_next;
os::free(s);
s = next_slab;
}
}
void ChunkHeaderPool::allocate_new_slab() {
Slab* slab = new Slab();
if (_current_slab != NULL) {
_current_slab->_next = slab;
}
_current_slab = slab;
if (_first_slab == NULL) {
_first_slab = slab;
}
_num_slabs.increment();
}
// Returns size of memory used.
size_t ChunkHeaderPool::memory_footprint_words() const {
return (_num_slabs.get() * sizeof(Slab)) / BytesPerWord;
}
void ChunkHeaderPool::initialize() {
assert(_chunkHeaderPool == NULL, "only once");
_chunkHeaderPool = new ChunkHeaderPool();
}
#ifdef ASSERT
void ChunkHeaderPool::verify() const {
const Slab* s = _first_slab;
int num = 0;
while (s != NULL) {
assert(s->_top >= 0 && s->_top <= SlabCapacity,
"invalid slab at " PTR_FORMAT ", top: %d, slab cap: %d",
p2i(s), s->_top, SlabCapacity );
s = s->_next;
num++;
}
_num_slabs.check(num);
}
#endif
} // namespace metaspace