hotspot/src/share/vm/gc/cms/gSpaceCounters.hpp
author pliden
Wed, 13 May 2015 15:16:06 +0200
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8079792: GC directory structure cleanup Reviewed-by: brutisso, stefank, david
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/*
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 * Copyright (c) 2002, 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_CMS_GSPACECOUNTERS_HPP
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#define SHARE_VM_GC_CMS_GSPACECOUNTERS_HPP
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#include "gc/shared/generation.hpp"
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#include "gc/shared/generationCounters.hpp"
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#include "runtime/perfData.hpp"
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#include "utilities/macros.hpp"
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// A GSpaceCounter is a holder class for performance counters
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// that track a space;
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class GSpaceCounters: public CHeapObj<mtGC> {
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  friend class VMStructs;
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  PerfVariable*      _capacity;
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  PerfVariable*      _used;
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  // Constant PerfData types don't need to retain a reference.
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  // However, it's a good idea to document them here.
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  // PerfConstant*     _size;
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  Generation*       _gen;
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  char*             _name_space;
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  GSpaceCounters(const char* name, int ordinal, size_t max_size, Generation* g,
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                 GenerationCounters* gc, bool sampled=true);
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  ~GSpaceCounters() {
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    if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space);
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  }
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  inline void update_capacity() {
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    _capacity->set_value(_gen->capacity());
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  }
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  inline void update_used() {
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    _used->set_value(_gen->used());
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  }
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  // special version of update_used() to allow the used value to be
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  // passed as a parameter. This method can can be used in cases were
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  // the  utilization is already known and/or when the _gen->used()
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  // method is known to be expensive and we want to avoid unnecessary
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  // calls to it.
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  //
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  inline void update_used(size_t used) {
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    _used->set_value(used);
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  }
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  inline void inc_used(size_t size) {
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    _used->inc(size);
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  }
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  debug_only(
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    // for security reasons, we do not allow arbitrary reads from
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    // the counters as they may live in shared memory.
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    jlong used() {
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      return _used->get_value();
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    }
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    jlong capacity() {
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      return _used->get_value();
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    }
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  )
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  inline void update_all() {
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    update_used();
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    update_capacity();
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  }
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  const char* name_space() const        { return _name_space; }
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};
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class GenerationUsedHelper : public PerfLongSampleHelper {
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  private:
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    Generation* _gen;
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  public:
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    GenerationUsedHelper(Generation* g) : _gen(g) { }
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    inline jlong take_sample() {
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      return _gen->used();
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    }
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};
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#endif // SHARE_VM_GC_CMS_GSPACECOUNTERS_HPP