hotspot/src/share/vm/gc_implementation/g1/heapRegionSeq.hpp
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8038423: G1: Decommit memory within heap Summary: Allow G1 to decommit memory of arbitrary regions within the heap and their associated auxiliary data structures card table, BOT, hot card cache, and mark bitmaps. Reviewed-by: mgerdin, brutisso, jwilhelm
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/*
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 * Copyright (c) 2001, 2013, 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_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP
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#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP
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#include "gc_implementation/g1/g1BiasedArray.hpp"
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#include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
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#include "gc_implementation/g1/heapRegionSet.hpp"
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class HeapRegion;
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class HeapRegionClosure;
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class FreeRegionList;
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class G1HeapRegionTable : public G1BiasedMappedArray<HeapRegion*> {
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 protected:
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  virtual HeapRegion* default_value() const { return NULL; }
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};
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// This class keeps track of the actual heap memory, auxiliary data
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// and its metadata (i.e., HeapRegion instances) and the list of free regions.
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//
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// This allows maximum flexibility for deciding what to commit or uncommit given
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// a request from outside.
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//
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// HeapRegions are kept in the _regions array in address order. A region's
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// index in the array corresponds to its index in the heap (i.e., 0 is the
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// region at the bottom of the heap, 1 is the one after it, etc.). Two
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// regions that are consecutive in the array should also be adjacent in the
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// address space (i.e., region(i).end() == region(i+1).bottom().
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//
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// We create a HeapRegion when we commit the region's address space
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// for the first time. When we uncommit the address space of a
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// region we retain the HeapRegion to be able to re-use it in the
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// future (in case we recommit it).
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//
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// We keep track of three lengths:
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//
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// * _num_committed (returned by length()) is the number of currently
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//   committed regions. These may not be contiguous.
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// * _allocated_heapregions_length (not exposed outside this class) is the
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//   number of regions+1 for which we have HeapRegions.
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// * max_length() returns the maximum number of regions the heap can have.
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//
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class HeapRegionSeq: public CHeapObj<mtGC> {
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  friend class VMStructs;
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  G1HeapRegionTable _regions;
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  G1RegionToSpaceMapper* _heap_mapper;
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  G1RegionToSpaceMapper* _prev_bitmap_mapper;
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  G1RegionToSpaceMapper* _next_bitmap_mapper;
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  G1RegionToSpaceMapper* _bot_mapper;
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  G1RegionToSpaceMapper* _cardtable_mapper;
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  G1RegionToSpaceMapper* _card_counts_mapper;
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  FreeRegionList _free_list;
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  // Each bit in this bitmap indicates that the corresponding region is available
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  // for allocation.
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  BitMap _available_map;
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   // The number of regions committed in the heap.
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  uint _num_committed;
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  // Internal only. The highest heap region +1 we allocated a HeapRegion instance for.
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  uint _allocated_heapregions_length;
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  HeapWord* heap_bottom() const { return _regions.bottom_address_mapped(); }
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  HeapWord* heap_end() const {return _regions.end_address_mapped(); }
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  void make_regions_available(uint index, uint num_regions = 1);
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  // Pass down commit calls to the VirtualSpace.
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  void commit_regions(uint index, size_t num_regions = 1);
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  void uncommit_regions(uint index, size_t num_regions = 1);
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  // Notify other data structures about change in the heap layout.
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  void update_committed_space(HeapWord* old_end, HeapWord* new_end);
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  // Calculate the starting region for each worker during parallel iteration so
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  // that they do not all start from the same region.
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  uint start_region_for_worker(uint worker_i, uint num_workers, uint num_regions) const;
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  // Find a contiguous set of empty or uncommitted regions of length num and return
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  // the index of the first region or G1_NO_HRS_INDEX if the search was unsuccessful.
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  // If only_empty is true, only empty regions are considered.
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  // Searches from bottom to top of the heap, doing a first-fit.
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  uint find_contiguous(size_t num, bool only_empty);
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  // Finds the next sequence of unavailable regions starting from start_idx. Returns the
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  // length of the sequence found. If this result is zero, no such sequence could be found,
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  // otherwise res_idx indicates the start index of these regions.
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  uint find_unavailable_from_idx(uint start_idx, uint* res_idx) const;
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  // Finds the next sequence of empty regions starting from start_idx, going backwards in
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  // the heap. Returns the length of the sequence found. If this value is zero, no
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  // sequence could be found, otherwise res_idx contains the start index of this range.
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  uint find_empty_from_idx_reverse(uint start_idx, uint* res_idx) const;
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  // Allocate a new HeapRegion for the given index.
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  HeapRegion* new_heap_region(uint hrs_index);
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#ifdef ASSERT
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public:
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  bool is_free(HeapRegion* hr) const;
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#endif
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  // Returns whether the given region is available for allocation.
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  bool is_available(uint region) const;
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 public:
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  // Empty constructor, we'll initialize it with the initialize() method.
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  HeapRegionSeq() : _regions(), _heap_mapper(NULL), _num_committed(0),
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                    _next_bitmap_mapper(NULL), _prev_bitmap_mapper(NULL), _bot_mapper(NULL),
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                    _allocated_heapregions_length(0), _available_map(),
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                    _free_list("Free list", new MasterFreeRegionListMtSafeChecker())
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  { }
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  void initialize(G1RegionToSpaceMapper* heap_storage,
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                  G1RegionToSpaceMapper* prev_bitmap,
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                  G1RegionToSpaceMapper* next_bitmap,
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                  G1RegionToSpaceMapper* bot,
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                  G1RegionToSpaceMapper* cardtable,
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                  G1RegionToSpaceMapper* card_counts);
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  // Return the "dummy" region used for G1AllocRegion. This is currently a hardwired
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  // new HeapRegion that owns HeapRegion at index 0. Since at the moment we commit
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  // the heap from the lowest address, this region (and its associated data
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  // structures) are available and we do not need to check further.
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  HeapRegion* get_dummy_region() { return new_heap_region(0); }
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  // Return the HeapRegion at the given index. Assume that the index
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  // is valid.
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  inline HeapRegion* at(uint index) const;
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  // If addr is within the committed space return its corresponding
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  // HeapRegion, otherwise return NULL.
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  inline HeapRegion* addr_to_region(HeapWord* addr) const;
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  // Insert the given region into the free region list.
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  inline void insert_into_free_list(HeapRegion* hr);
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  // Insert the given region list into the global free region list.
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  void insert_list_into_free_list(FreeRegionList* list) {
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    _free_list.add_ordered(list);
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  }
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  HeapRegion* allocate_free_region(bool is_old) {
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    HeapRegion* hr = _free_list.remove_region(is_old);
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    if (hr != NULL) {
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      assert(hr->next() == NULL, "Single region should not have next");
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      assert(is_available(hr->hrs_index()), "Must be committed");
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    }
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    return hr;
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  }
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  inline void allocate_free_regions_starting_at(uint first, uint num_regions);
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  // Remove all regions from the free list.
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  void remove_all_free_regions() {
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    _free_list.remove_all();
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  }
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  // Return the number of committed free regions in the heap.
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  uint num_free_regions() const {
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    return _free_list.length();
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  }
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  size_t total_capacity_bytes() const {
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    return num_free_regions() * HeapRegion::GrainBytes;
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  }
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  // Return the number of available (uncommitted) regions.
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  uint available() const { return max_length() - length(); }
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  // Return the number of regions that have been committed in the heap.
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  uint length() const { return _num_committed; }
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  // Return the maximum number of regions in the heap.
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  uint max_length() const { return (uint)_regions.length(); }
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  MemRegion reserved() const { return MemRegion(heap_bottom(), heap_end()); }
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  // Expand the sequence to reflect that the heap has grown. Either create new
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  // HeapRegions, or re-use existing ones. Returns the number of regions the
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  // sequence was expanded by. If a HeapRegion allocation fails, the resulting
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  // number of regions might be smaller than what's desired.
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  uint expand_by(uint num_regions);
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  // Makes sure that the regions from start to start+num_regions-1 are available
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  // for allocation. Returns the number of regions that were committed to achieve
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  // this.
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  uint expand_at(uint start, uint num_regions);
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  // Find a contiguous set of empty regions of length num. Returns the start index of
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  // that set, or G1_NO_HRS_INDEX.
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  uint find_contiguous_only_empty(size_t num) { return find_contiguous(num, true); }
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  // Find a contiguous set of empty or unavailable regions of length num. Returns the
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  // start index of that set, or G1_NO_HRS_INDEX.
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  uint find_contiguous_empty_or_unavailable(size_t num) { return find_contiguous(num, false); }
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  HeapRegion* next_region_in_heap(const HeapRegion* r) const;
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  // Apply blk->doHeapRegion() on all committed regions in address order,
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  // terminating the iteration early if doHeapRegion() returns true.
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  void iterate(HeapRegionClosure* blk) const;
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  void par_iterate(HeapRegionClosure* blk, uint worker_id, uint no_of_par_workers, jint claim_value) const;
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  // Uncommit up to num_regions_to_remove regions that are completely free.
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  // Return the actual number of uncommitted regions.
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  uint shrink_by(uint num_regions_to_remove);
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  void verify();
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  // Do some sanity checking.
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  void verify_optional() PRODUCT_RETURN;
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};
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP
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