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freeBlocks.cpp
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freeBlocks.cpp
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/*
* Copyright (c) 2020, 2023, 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/freeBlocks.hpp"
#include "utilities/debug.hpp"
#include "utilities/globalDefinitions.hpp"
namespace metaspace {
void FreeBlocks::add_block(MetaWord* p, size_t word_size) {
assert(word_size >= MinWordSize, "sanity (" SIZE_FORMAT ")", word_size);
if (word_size > MaxSmallBlocksWordSize) {
_tree.add_block(p, word_size);
} else {
_small_blocks.add_block(p, word_size);
}
}
MetaWord* FreeBlocks::remove_block(size_t requested_word_size) {
assert(requested_word_size >= MinWordSize,
"requested_word_size too small (" SIZE_FORMAT ")", requested_word_size);
size_t real_size = 0;
MetaWord* p = nullptr;
if (requested_word_size > MaxSmallBlocksWordSize) {
p = _tree.remove_block(requested_word_size, &real_size);
} else {
p = _small_blocks.remove_block(requested_word_size, &real_size);
}
if (p != nullptr) {
// Blocks which are larger than a certain threshold are split and
// the remainder is handed back to the manager.
const size_t waste = real_size - requested_word_size;
if (waste > MinWordSize) {
add_block(p + requested_word_size, waste);
}
}
return p;
}
} // namespace metaspace