--- old/src/hotspot/share/memory/metaspace/commitLimiter.hpp 2020-09-04 13:58:22.573571681 +0200 +++ /dev/null 2020-09-04 12:37:41.765504620 +0200 @@ -1,84 +0,0 @@ -/* - * 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. - * - */ - -#ifndef SHARE_MEMORY_METASPACE_COMMITLIMITER_HPP -#define SHARE_MEMORY_METASPACE_COMMITLIMITER_HPP - -#include "memory/allocation.hpp" -#include "memory/metaspace/counter.hpp" - -namespace metaspace { - -// The CommitLimiter encapsulates a limit we may want to impose on how much -// memory can be committed. This is a matter of separation of concerns: -// -// In metaspace, we have two limits to committing memory: the absolute limit, -// MaxMetaspaceSize; and the GC threshold. In both cases an allocation should -// fail if it would require committing memory and hit one of these limits. -// -// However, the actual Metaspace allocator is a generic one and this -// GC- and classloading specific logic should be kept separate. Therefore -// it is hidden inside this interface. -// -// This allows us to: -// - more easily write tests for metaspace, by providing a different implementation -// of the commit limiter, thus keeping test logic separate from VM state. -// - (potentially) use the metaspace for things other than class metadata, -// where different commit rules would apply. -// -class CommitLimiter : public CHeapObj { - - // Counts total words committed for metaspace - SizeCounter _cnt; - - // Purely for testing purposes: cap, in words. - const size_t _cap; - -public: - - // Create a commit limiter. This is only useful for testing, with a cap != 0, - // since normal code should use the global commit limiter. - // If cap != 0 (word size), the cap replaces the internal logic of limiting. - CommitLimiter(size_t cap = 0) : _cnt(), _cap(cap) {} - - // 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 possible_expansion_words() const; - - void increase_committed(size_t word_size) { _cnt.increment_by(word_size); } - void decrease_committed(size_t word_size) { _cnt.decrement_by(word_size); } - - size_t committed_words() const { return _cnt.get(); } - size_t cap() const { return _cap; } - - // Returns the global metaspace commit counter - static CommitLimiter* globalLimiter(); - -}; - -} // namespace metaspace - -#endif // SHARE_MEMORY_METASPACE_COMMITLIMITER_HPP