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commitLimiter.cpp
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commitLimiter.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/commitLimiter.hpp"
#include "memory/metaspace.hpp"
#include "utilities/debug.hpp"
#include "utilities/globalDefinitions.hpp"
namespace metaspace {
// Returns the size, in words, by which we may expand the metaspace committed area without:
// - _cap == 0: hitting GC threshold or the MaxMetaspaceSize
// - _cap > 0: hitting cap (this is just for testing purposes)
size_t CommitLimiter::possible_expansion_words() const {
if (_cap > 0) { // Testing.
assert(_cnt.get() <= _cap, "Beyond limit?");
return _cap - _cnt.get();
}
assert(_cnt.get() * BytesPerWord <= MaxMetaspaceSize, "Beyond limit?");
const size_t words_left_below_max = MaxMetaspaceSize / BytesPerWord - _cnt.get();
const size_t words_left_below_gc_threshold = MetaspaceGC::allowed_expansion();
return MIN2(words_left_below_max, words_left_below_gc_threshold);
}
static CommitLimiter g_global_limiter(0);
// Returns the global metaspace commit counter
CommitLimiter* CommitLimiter::globalLimiter() {
return &g_global_limiter;
}
} // namespace metaspace