Mercurial > hg > truffle
view src/share/vm/gc_implementation/shared/generationCounters.hpp @ 2134:b158bed62ef5
6994297: G1: do first-level slow-path allocations with a CAS
Summary: First attempt to allocate out the current alloc region using a CAS instead of taking the Heap_lock (first level of G1's slow allocation path). Only if that fails and it's necessary to replace the current alloc region take the Heap_lock (that's the second level of G1's slow allocation path).
Reviewed-by: johnc, brutisso, ysr
author | tonyp |
---|---|
date | Wed, 12 Jan 2011 16:34:25 -0500 |
parents | f95d63e2154a |
children | b52782ae3880 |
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/* * Copyright (c) 2002, 2010, 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_SHARED_GENERATIONCOUNTERS_HPP #define SHARE_VM_GC_IMPLEMENTATION_SHARED_GENERATIONCOUNTERS_HPP #include "runtime/perfData.hpp" #include "runtime/virtualspace.hpp" // A GenerationCounter is a holder class for performance counters // that track a generation class GenerationCounters: public CHeapObj { friend class VMStructs; protected: PerfVariable* _current_size; VirtualSpace* _virtual_space; // Constant PerfData types don't need to retain a reference. // However, it's a good idea to document them here. // PerfStringConstant* _name; // PerfConstant* _min_size; // PerfConstant* _max_size; // PerfConstant* _spaces; char* _name_space; // This constructor is only meant for use with the PSGenerationCounters // constructor. The need for such an constructor should be eliminated // when VirtualSpace and PSVirtualSpace are unified. GenerationCounters() : _name_space(NULL), _current_size(NULL), _virtual_space(NULL) {} public: GenerationCounters(const char* name, int ordinal, int spaces, VirtualSpace* v); ~GenerationCounters() { if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space); } virtual void update_all() { _current_size->set_value(_virtual_space->committed_size()); } const char* name_space() const { return _name_space; } }; #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_GENERATIONCOUNTERS_HPP