Mercurial > hg > graal-jvmci-8
diff src/share/vm/gc_implementation/g1/g1StringDedupThread.hpp @ 17764:595c0f60d50d
8029075: String deduplication in G1
Summary: Implementation of JEP 192, http://openjdk.java.net/jeps/192
Reviewed-by: brutisso, tschatzl, coleenp
author | pliden |
---|---|
date | Tue, 18 Mar 2014 19:07:22 +0100 |
parents | |
children | 1772223a25a2 |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/g1/g1StringDedupThread.hpp Tue Mar 18 19:07:22 2014 +0100 @@ -0,0 +1,56 @@ +/* + * Copyright (c) 2014, 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. + * + */ + +#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1STRINGDEDUPTHREAD_HPP +#define SHARE_VM_GC_IMPLEMENTATION_G1_G1STRINGDEDUPTHREAD_HPP + +#include "gc_implementation/g1/g1StringDedupStat.hpp" +#include "gc_implementation/shared/concurrentGCThread.hpp" + +// +// The deduplication thread is where the actual deduplication occurs. It waits for +// deduplication candidates to appear on the deduplication queue, removes them from +// the queue and tries to deduplicate them. It uses the deduplication hashtable to +// find identical, already existing, character arrays on the heap. The thread runs +// concurrently with the Java application but participates in safepoints to allow +// the GC to adjust and unlink oops from the deduplication queue and table. +// +class G1StringDedupThread: public ConcurrentGCThread { +private: + static G1StringDedupThread* _thread; + + G1StringDedupThread(); + ~G1StringDedupThread(); + + void print(outputStream* st, const G1StringDedupStat& last_stat, const G1StringDedupStat& total_stat); + +public: + static void create(); + static G1StringDedupThread* thread(); + + virtual void run(); + virtual void print_on(outputStream* st) const; +}; + +#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1STRINGDEDUPTHREAD_HPP