hotspot/src/share/vm/gc_implementation/g1/concurrentMark.hpp
author stefank
Tue, 23 Nov 2010 13:22:55 -0800
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6989984: Use standard include model for Hospot Summary: Replaced MakeDeps and the includeDB files with more standardized solutions. Reviewed-by: coleenp, kvn, kamg
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/*
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 * Copyright (c) 2001, 2010, 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_CONCURRENTMARK_HPP
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#define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP
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#include "gc_implementation/g1/heapRegion.hpp"
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#include "utilities/taskqueue.hpp"
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class G1CollectedHeap;
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class CMTask;
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typedef GenericTaskQueue<oop>            CMTaskQueue;
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typedef GenericTaskQueueSet<CMTaskQueue> CMTaskQueueSet;
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// A generic CM bit map.  This is essentially a wrapper around the BitMap
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// class, with one bit per (1<<_shifter) HeapWords.
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class CMBitMapRO VALUE_OBJ_CLASS_SPEC {
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 protected:
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  HeapWord* _bmStartWord;      // base address of range covered by map
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  size_t    _bmWordSize;       // map size (in #HeapWords covered)
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  const int _shifter;          // map to char or bit
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  VirtualSpace _virtual_space; // underlying the bit map
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  BitMap    _bm;               // the bit map itself
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 public:
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  // constructor
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  CMBitMapRO(ReservedSpace rs, int shifter);
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  enum { do_yield = true };
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  // inquiries
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  HeapWord* startWord()   const { return _bmStartWord; }
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  size_t    sizeInWords() const { return _bmWordSize;  }
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  // the following is one past the last word in space
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  HeapWord* endWord()     const { return _bmStartWord + _bmWordSize; }
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  // read marks
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  bool isMarked(HeapWord* addr) const {
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    assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize),
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           "outside underlying space?");
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    return _bm.at(heapWordToOffset(addr));
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  }
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  // iteration
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  bool iterate(BitMapClosure* cl) { return _bm.iterate(cl); }
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  bool iterate(BitMapClosure* cl, MemRegion mr);
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  // Return the address corresponding to the next marked bit at or after
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  // "addr", and before "limit", if "limit" is non-NULL.  If there is no
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  // such bit, returns "limit" if that is non-NULL, or else "endWord()".
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  HeapWord* getNextMarkedWordAddress(HeapWord* addr,
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                                     HeapWord* limit = NULL) const;
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  // Return the address corresponding to the next unmarked bit at or after
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  // "addr", and before "limit", if "limit" is non-NULL.  If there is no
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  // such bit, returns "limit" if that is non-NULL, or else "endWord()".
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  HeapWord* getNextUnmarkedWordAddress(HeapWord* addr,
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                                       HeapWord* limit = NULL) const;
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  // conversion utilities
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  // XXX Fix these so that offsets are size_t's...
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  HeapWord* offsetToHeapWord(size_t offset) const {
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    return _bmStartWord + (offset << _shifter);
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  }
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  size_t heapWordToOffset(HeapWord* addr) const {
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    return pointer_delta(addr, _bmStartWord) >> _shifter;
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  }
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  int heapWordDiffToOffsetDiff(size_t diff) const;
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  HeapWord* nextWord(HeapWord* addr) {
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    return offsetToHeapWord(heapWordToOffset(addr) + 1);
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  }
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  void mostly_disjoint_range_union(BitMap*   from_bitmap,
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                                   size_t    from_start_index,
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                                   HeapWord* to_start_word,
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                                   size_t    word_num);
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  // debugging
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  NOT_PRODUCT(bool covers(ReservedSpace rs) const;)
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};
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class CMBitMap : public CMBitMapRO {
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 public:
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  // constructor
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  CMBitMap(ReservedSpace rs, int shifter) :
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    CMBitMapRO(rs, shifter) {}
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  // write marks
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  void mark(HeapWord* addr) {
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    assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize),
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           "outside underlying space?");
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    _bm.at_put(heapWordToOffset(addr), true);
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  }
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  void clear(HeapWord* addr) {
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    assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize),
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           "outside underlying space?");
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    _bm.at_put(heapWordToOffset(addr), false);
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  }
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  bool parMark(HeapWord* addr) {
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    assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize),
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           "outside underlying space?");
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    return _bm.par_at_put(heapWordToOffset(addr), true);
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  }
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  bool parClear(HeapWord* addr) {
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    assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize),
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           "outside underlying space?");
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    return _bm.par_at_put(heapWordToOffset(addr), false);
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  }
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  void markRange(MemRegion mr);
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  void clearAll();
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  void clearRange(MemRegion mr);
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  // Starting at the bit corresponding to "addr" (inclusive), find the next
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  // "1" bit, if any.  This bit starts some run of consecutive "1"'s; find
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  // the end of this run (stopping at "end_addr").  Return the MemRegion
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  // covering from the start of the region corresponding to the first bit
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  // of the run to the end of the region corresponding to the last bit of
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  // the run.  If there is no "1" bit at or after "addr", return an empty
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  // MemRegion.
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  MemRegion getAndClearMarkedRegion(HeapWord* addr, HeapWord* end_addr);
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};
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// Represents a marking stack used by the CM collector.
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// Ideally this should be GrowableArray<> just like MSC's marking stack(s).
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class CMMarkStack VALUE_OBJ_CLASS_SPEC {
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  ConcurrentMark* _cm;
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  oop*   _base;      // bottom of stack
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  jint   _index;     // one more than last occupied index
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  jint   _capacity;  // max #elements
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  jint   _oops_do_bound;  // Number of elements to include in next iteration.
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  NOT_PRODUCT(jint _max_depth;)  // max depth plumbed during run
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  bool   _overflow;
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  DEBUG_ONLY(bool _drain_in_progress;)
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  DEBUG_ONLY(bool _drain_in_progress_yields;)
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 public:
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  CMMarkStack(ConcurrentMark* cm);
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  ~CMMarkStack();
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  void allocate(size_t size);
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  oop pop() {
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    if (!isEmpty()) {
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      return _base[--_index] ;
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    }
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    return NULL;
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  }
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  // If overflow happens, don't do the push, and record the overflow.
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  // *Requires* that "ptr" is already marked.
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  void push(oop ptr) {
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    if (isFull()) {
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      // Record overflow.
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      _overflow = true;
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      return;
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    } else {
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      _base[_index++] = ptr;
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      NOT_PRODUCT(_max_depth = MAX2(_max_depth, _index));
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    }
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  }
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  // Non-block impl.  Note: concurrency is allowed only with other
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  // "par_push" operations, not with "pop" or "drain".  We would need
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  // parallel versions of them if such concurrency was desired.
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  void par_push(oop ptr);
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  // Pushes the first "n" elements of "ptr_arr" on the stack.
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  // Non-block impl.  Note: concurrency is allowed only with other
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  // "par_adjoin_arr" or "push" operations, not with "pop" or "drain".
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  void par_adjoin_arr(oop* ptr_arr, int n);
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  // Pushes the first "n" elements of "ptr_arr" on the stack.
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  // Locking impl: concurrency is allowed only with
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  // "par_push_arr" and/or "par_pop_arr" operations, which use the same
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  // locking strategy.
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  void par_push_arr(oop* ptr_arr, int n);
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  // If returns false, the array was empty.  Otherwise, removes up to "max"
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  // elements from the stack, and transfers them to "ptr_arr" in an
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  // unspecified order.  The actual number transferred is given in "n" ("n
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  // == 0" is deliberately redundant with the return value.)  Locking impl:
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  // concurrency is allowed only with "par_push_arr" and/or "par_pop_arr"
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  // operations, which use the same locking strategy.
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  bool par_pop_arr(oop* ptr_arr, int max, int* n);
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  // Drain the mark stack, applying the given closure to all fields of
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  // objects on the stack.  (That is, continue until the stack is empty,
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  // even if closure applications add entries to the stack.)  The "bm"
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  // argument, if non-null, may be used to verify that only marked objects
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  // are on the mark stack.  If "yield_after" is "true", then the
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  // concurrent marker performing the drain offers to yield after
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  // processing each object.  If a yield occurs, stops the drain operation
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  // and returns false.  Otherwise, returns true.
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  template<class OopClosureClass>
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  bool drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after = false);
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  bool isEmpty()    { return _index == 0; }
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  bool isFull()     { return _index == _capacity; }
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  int maxElems()    { return _capacity; }
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  bool overflow() { return _overflow; }
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  void clear_overflow() { _overflow = false; }
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  int  size() { return _index; }
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  void setEmpty()   { _index = 0; clear_overflow(); }
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  // Record the current size; a subsequent "oops_do" will iterate only over
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  // indices valid at the time of this call.
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  void set_oops_do_bound(jint bound = -1) {
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    if (bound == -1) {
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      _oops_do_bound = _index;
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    } else {
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      _oops_do_bound = bound;
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    }
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  }
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  jint oops_do_bound() { return _oops_do_bound; }
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  // iterate over the oops in the mark stack, up to the bound recorded via
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  // the call above.
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  void oops_do(OopClosure* f);
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};
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class CMRegionStack VALUE_OBJ_CLASS_SPEC {
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  MemRegion* _base;
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  jint _capacity;
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  jint _index;
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  jint _oops_do_bound;
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  bool _overflow;
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public:
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  CMRegionStack();
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  ~CMRegionStack();
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  void allocate(size_t size);
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  // This is lock-free; assumes that it will only be called in parallel
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  // with other "push" operations (no pops).
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  void push_lock_free(MemRegion mr);
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  // Lock-free; assumes that it will only be called in parallel
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  // with other "pop" operations (no pushes).
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  MemRegion pop_lock_free();
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#if 0
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  // The routines that manipulate the region stack with a lock are
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  // not currently used. They should be retained, however, as a
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  // diagnostic aid.
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  // These two are the implementations that use a lock. They can be
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  // called concurrently with each other but they should not be called
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  // concurrently with the lock-free versions (push() / pop()).
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  void push_with_lock(MemRegion mr);
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  MemRegion pop_with_lock();
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#endif
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  bool isEmpty()    { return _index == 0; }
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  bool isFull()     { return _index == _capacity; }
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  bool overflow() { return _overflow; }
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  void clear_overflow() { _overflow = false; }
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  int  size() { return _index; }
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  // It iterates over the entries in the region stack and it
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  // invalidates (i.e. assigns MemRegion()) the ones that point to
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  // regions in the collection set.
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  bool invalidate_entries_into_cset();
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  // This gives an upper bound up to which the iteration in
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  // invalidate_entries_into_cset() will reach. This prevents
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  // newly-added entries to be unnecessarily scanned.
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  void set_oops_do_bound() {
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    _oops_do_bound = _index;
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  }
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  void setEmpty()   { _index = 0; clear_overflow(); }
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};
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// this will enable a variety of different statistics per GC task
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#define _MARKING_STATS_       0
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// this will enable the higher verbose levels
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#define _MARKING_VERBOSE_     0
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#if _MARKING_STATS_
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#define statsOnly(statement)  \
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do {                          \
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  statement ;                 \
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} while (0)
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#else // _MARKING_STATS_
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#define statsOnly(statement)  \
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do {                          \
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} while (0)
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#endif // _MARKING_STATS_
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typedef enum {
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  no_verbose  = 0,   // verbose turned off
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  stats_verbose,     // only prints stats at the end of marking
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  low_verbose,       // low verbose, mostly per region and per major event
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  medium_verbose,    // a bit more detailed than low
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  high_verbose       // per object verbose
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} CMVerboseLevel;
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class ConcurrentMarkThread;
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class ConcurrentMark: public CHeapObj {
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  friend class ConcurrentMarkThread;
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  friend class CMTask;
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  friend class CMBitMapClosure;
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  friend class CSMarkOopClosure;
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  friend class CMGlobalObjectClosure;
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  friend class CMRemarkTask;
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  friend class CMConcurrentMarkingTask;
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  friend class G1ParNoteEndTask;
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  friend class CalcLiveObjectsClosure;
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protected:
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  ConcurrentMarkThread* _cmThread;   // the thread doing the work
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  G1CollectedHeap*      _g1h;        // the heap.
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  size_t                _parallel_marking_threads; // the number of marking
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                                                   // threads we'll use
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  double                _sleep_factor; // how much we have to sleep, with
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                                       // respect to the work we just did, to
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                                       // meet the marking overhead goal
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  double                _marking_task_overhead; // marking target overhead for
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                                                // a single task
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  // same as the two above, but for the cleanup task
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  double                _cleanup_sleep_factor;
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  double                _cleanup_task_overhead;
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  // Stuff related to age cohort processing.
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  struct ParCleanupThreadState {
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    char _pre[64];
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    UncleanRegionList list;
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    char _post[64];
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  };
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  ParCleanupThreadState** _par_cleanup_thread_state;
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  // CMS marking support structures
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  CMBitMap                _markBitMap1;
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  CMBitMap                _markBitMap2;
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  CMBitMapRO*             _prevMarkBitMap; // completed mark bitmap
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  CMBitMap*               _nextMarkBitMap; // under-construction mark bitmap
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  bool                    _at_least_one_mark_complete;
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  BitMap                  _region_bm;
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  BitMap                  _card_bm;
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  // Heap bounds
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  HeapWord*               _heap_start;
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  HeapWord*               _heap_end;
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  // For gray objects
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  CMMarkStack             _markStack; // Grey objects behind global finger.
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  CMRegionStack           _regionStack; // Grey regions behind global finger.
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  HeapWord* volatile      _finger;  // the global finger, region aligned,
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                                    // always points to the end of the
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                                    // last claimed region
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  // marking tasks
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  size_t                  _max_task_num; // maximum task number
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  size_t                  _active_tasks; // task num currently active
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  CMTask**                _tasks;        // task queue array (max_task_num len)
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  CMTaskQueueSet*         _task_queues;  // task queue set
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  ParallelTaskTerminator  _terminator;   // for termination
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  // Two sync barriers that are used to synchronise tasks when an
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  // overflow occurs. The algorithm is the following. All tasks enter
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  // the first one to ensure that they have all stopped manipulating
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  // the global data structures. After they exit it, they re-initialise
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  // their data structures and task 0 re-initialises the global data
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  // structures. Then, they enter the second sync barrier. This
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  // ensure, that no task starts doing work before all data
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  // structures (local and global) have been re-initialised. When they
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  // exit it, they are free to start working again.
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  WorkGangBarrierSync     _first_overflow_barrier_sync;
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  WorkGangBarrierSync     _second_overflow_barrier_sync;
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  // this is set by any task, when an overflow on the global data
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  // structures is detected.
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  volatile bool           _has_overflown;
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  // true: marking is concurrent, false: we're in remark
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  volatile bool           _concurrent;
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  // set at the end of a Full GC so that marking aborts
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  volatile bool           _has_aborted;
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  // used when remark aborts due to an overflow to indicate that
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  // another concurrent marking phase should start
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  volatile bool           _restart_for_overflow;
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   413
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  // This is true from the very start of concurrent marking until the
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  // point when all the tasks complete their work. It is really used
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  // to determine the points between the end of concurrent marking and
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  // time of remark.
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  volatile bool           _concurrent_marking_in_progress;
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   419
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  // verbose level
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  CMVerboseLevel          _verbose_level;
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   422
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  // These two fields are used to implement the optimisation that
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  // avoids pushing objects on the global/region stack if there are
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  // no collection set regions above the lowest finger.
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   426
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  // This is the lowest finger (among the global and local fingers),
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  // which is calculated before a new collection set is chosen.
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  HeapWord* _min_finger;
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  // If this flag is true, objects/regions that are marked below the
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  // finger should be pushed on the stack(s). If this is flag is
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  // false, it is safe not to push them on the stack(s).
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  bool      _should_gray_objects;
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   434
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  // All of these times are in ms.
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  NumberSeq _init_times;
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  NumberSeq _remark_times;
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  NumberSeq   _remark_mark_times;
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   439
  NumberSeq   _remark_weak_ref_times;
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  NumberSeq _cleanup_times;
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  double    _total_counting_time;
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  double    _total_rs_scrub_time;
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   443
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  double*   _accum_task_vtime;   // accumulated task vtime
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   445
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  WorkGang* _parallel_workers;
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   447
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  void weakRefsWork(bool clear_all_soft_refs);
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  void swapMarkBitMaps();
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   451
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   452
  // It resets the global marking data structures, as well as the
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  // task local ones; should be called during initial mark.
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   454
  void reset();
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   455
  // It resets all the marking data structures.
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   456
  void clear_marking_state();
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   457
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   458
  // It should be called to indicate which phase we're in (concurrent
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   459
  // mark or remark) and how many threads are currently active.
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  void set_phase(size_t active_tasks, bool concurrent);
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   461
  // We do this after we're done with marking so that the marking data
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   462
  // structures are initialised to a sensible and predictable state.
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   463
  void set_non_marking_state();
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diff changeset
   464
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   465
  // prints all gathered CM-related statistics
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   466
  void print_stats();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   467
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   468
  // accessor methods
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   469
  size_t parallel_marking_threads() { return _parallel_marking_threads; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   470
  double sleep_factor()             { return _sleep_factor; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   471
  double marking_task_overhead()    { return _marking_task_overhead;}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   472
  double cleanup_sleep_factor()     { return _cleanup_sleep_factor; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   473
  double cleanup_task_overhead()    { return _cleanup_task_overhead;}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   474
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   475
  HeapWord*               finger()        { return _finger;   }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   476
  bool                    concurrent()    { return _concurrent; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   477
  size_t                  active_tasks()  { return _active_tasks; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   478
  ParallelTaskTerminator* terminator()    { return &_terminator; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   479
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   480
  // It claims the next available region to be scanned by a marking
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   481
  // task. It might return NULL if the next region is empty or we have
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   482
  // run out of regions. In the latter case, out_of_regions()
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   483
  // determines whether we've really run out of regions or the task
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   484
  // should call claim_region() again.  This might seem a bit
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   485
  // awkward. Originally, the code was written so that claim_region()
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   486
  // either successfully returned with a non-empty region or there
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   487
  // were no more regions to be claimed. The problem with this was
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   488
  // that, in certain circumstances, it iterated over large chunks of
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   489
  // the heap finding only empty regions and, while it was working, it
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   490
  // was preventing the calling task to call its regular clock
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   491
  // method. So, this way, each task will spend very little time in
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   492
  // claim_region() and is allowed to call the regular clock method
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   493
  // frequently.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   494
  HeapRegion* claim_region(int task);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   495
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   496
  // It determines whether we've run out of regions to scan.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   497
  bool        out_of_regions() { return _finger == _heap_end; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   498
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   499
  // Returns the task with the given id
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   500
  CMTask* task(int id) {
4026
10386ea70fe5 6888619: G1: too many guarantees in concurrent marking
tonyp
parents: 4022
diff changeset
   501
    assert(0 <= id && id < (int) _active_tasks,
10386ea70fe5 6888619: G1: too many guarantees in concurrent marking
tonyp
parents: 4022
diff changeset
   502
           "task id not within active bounds");
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   503
    return _tasks[id];
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   504
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   505
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   506
  // Returns the task queue with the given id
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   507
  CMTaskQueue* task_queue(int id) {
4026
10386ea70fe5 6888619: G1: too many guarantees in concurrent marking
tonyp
parents: 4022
diff changeset
   508
    assert(0 <= id && id < (int) _active_tasks,
10386ea70fe5 6888619: G1: too many guarantees in concurrent marking
tonyp
parents: 4022
diff changeset
   509
           "task queue id not within active bounds");
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   510
    return (CMTaskQueue*) _task_queues->queue(id);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   511
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   512
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   513
  // Returns the task queue set
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   514
  CMTaskQueueSet* task_queues()  { return _task_queues; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   515
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   516
  // Access / manipulation of the overflow flag which is set to
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   517
  // indicate that the global stack or region stack has overflown
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   518
  bool has_overflown()           { return _has_overflown; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   519
  void set_has_overflown()       { _has_overflown = true; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   520
  void clear_has_overflown()     { _has_overflown = false; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   521
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   522
  bool has_aborted()             { return _has_aborted; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   523
  bool restart_for_overflow()    { return _restart_for_overflow; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   524
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   525
  // Methods to enter the two overflow sync barriers
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   526
  void enter_first_sync_barrier(int task_num);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   527
  void enter_second_sync_barrier(int task_num);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   528
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   529
public:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   530
  // Manipulation of the global mark stack.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   531
  // Notice that the first mark_stack_push is CAS-based, whereas the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   532
  // two below are Mutex-based. This is OK since the first one is only
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   533
  // called during evacuation pauses and doesn't compete with the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   534
  // other two (which are called by the marking tasks during
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   535
  // concurrent marking or remark).
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   536
  bool mark_stack_push(oop p) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   537
    _markStack.par_push(p);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   538
    if (_markStack.overflow()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   539
      set_has_overflown();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   540
      return false;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   541
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   542
    return true;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   543
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   544
  bool mark_stack_push(oop* arr, int n) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   545
    _markStack.par_push_arr(arr, n);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   546
    if (_markStack.overflow()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   547
      set_has_overflown();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   548
      return false;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   549
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   550
    return true;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   551
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   552
  void mark_stack_pop(oop* arr, int max, int* n) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   553
    _markStack.par_pop_arr(arr, max, n);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   554
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   555
  size_t mark_stack_size()              { return _markStack.size(); }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   556
  size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   557
  bool mark_stack_overflow()            { return _markStack.overflow(); }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   558
  bool mark_stack_empty()               { return _markStack.isEmpty(); }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   559
6761
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   560
  // (Lock-free) Manipulation of the region stack
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   561
  bool region_stack_push_lock_free(MemRegion mr) {
5242
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   562
    // Currently we only call the lock-free version during evacuation
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   563
    // pauses.
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   564
    assert(SafepointSynchronize::is_at_safepoint(), "world should be stopped");
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   565
6761
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   566
    _regionStack.push_lock_free(mr);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   567
    if (_regionStack.overflow()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   568
      set_has_overflown();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   569
      return false;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   570
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   571
    return true;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   572
  }
6761
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   573
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   574
  // Lock-free version of region-stack pop. Should only be
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   575
  // called in tandem with other lock-free pops.
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   576
  MemRegion region_stack_pop_lock_free() {
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   577
    return _regionStack.pop_lock_free();
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   578
  }
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   579
5242
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   580
#if 0
6761
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   581
  // The routines that manipulate the region stack with a lock are
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   582
  // not currently used. They should be retained, however, as a
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   583
  // diagnostic aid.
5242
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   584
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   585
  bool region_stack_push_with_lock(MemRegion mr) {
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   586
    // Currently we only call the lock-based version during either
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   587
    // concurrent marking or remark.
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   588
    assert(!SafepointSynchronize::is_at_safepoint() || !concurrent(),
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   589
           "if we are at a safepoint it should be the remark safepoint");
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   590
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   591
    _regionStack.push_with_lock(mr);
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   592
    if (_regionStack.overflow()) {
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   593
      set_has_overflown();
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   594
      return false;
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   595
    }
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   596
    return true;
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   597
  }
6761
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   598
5242
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   599
  MemRegion region_stack_pop_with_lock() {
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   600
    // Currently we only call the lock-based version during either
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   601
    // concurrent marking or remark.
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   602
    assert(!SafepointSynchronize::is_at_safepoint() || !concurrent(),
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   603
           "if we are at a safepoint it should be the remark safepoint");
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   604
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   605
    return _regionStack.pop_with_lock();
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   606
  }
6761
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   607
#endif
5242
85cf92183e39 6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents: 5076
diff changeset
   608
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   609
  int region_stack_size()               { return _regionStack.size(); }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   610
  bool region_stack_overflow()          { return _regionStack.overflow(); }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   611
  bool region_stack_empty()             { return _regionStack.isEmpty(); }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   612
6761
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   613
  // Iterate over any regions that were aborted while draining the
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   614
  // region stack (any such regions are saved in the corresponding
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   615
  // CMTask) and invalidate (i.e. assign to the empty MemRegion())
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   616
  // any regions that point into the collection set.
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   617
  bool invalidate_aborted_regions_in_cset();
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   618
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   619
  // Returns true if there are any aborted memory regions.
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   620
  bool has_aborted_regions();
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   621
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   622
  bool concurrent_marking_in_progress() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   623
    return _concurrent_marking_in_progress;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   624
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   625
  void set_concurrent_marking_in_progress() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   626
    _concurrent_marking_in_progress = true;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   627
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   628
  void clear_concurrent_marking_in_progress() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   629
    _concurrent_marking_in_progress = false;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   630
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   631
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   632
  void update_accum_task_vtime(int i, double vtime) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   633
    _accum_task_vtime[i] += vtime;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   634
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   635
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   636
  double all_task_accum_vtime() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   637
    double ret = 0.0;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   638
    for (int i = 0; i < (int)_max_task_num; ++i)
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   639
      ret += _accum_task_vtime[i];
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   640
    return ret;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   641
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   642
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   643
  // Attempts to steal an object from the task queues of other tasks
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   644
  bool try_stealing(int task_num, int* hash_seed, oop& obj) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   645
    return _task_queues->steal(task_num, hash_seed, obj);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   646
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   647
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   648
  // It grays an object by first marking it. Then, if it's behind the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   649
  // global finger, it also pushes it on the global stack.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   650
  void deal_with_reference(oop obj);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   651
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   652
  ConcurrentMark(ReservedSpace rs, int max_regions);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   653
  ~ConcurrentMark();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   654
  ConcurrentMarkThread* cmThread() { return _cmThread; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   655
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   656
  CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   657
  CMBitMap*   nextMarkBitMap() const { return _nextMarkBitMap; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   658
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   659
  // The following three are interaction between CM and
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   660
  // G1CollectedHeap
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   661
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   662
  // This notifies CM that a root during initial-mark needs to be
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   663
  // grayed and it's MT-safe. Currently, we just mark it. But, in the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   664
  // future, we can experiment with pushing it on the stack and we can
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   665
  // do this without changing G1CollectedHeap.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   666
  void grayRoot(oop p);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   667
  // It's used during evacuation pauses to gray a region, if
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   668
  // necessary, and it's MT-safe. It assumes that the caller has
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   669
  // marked any objects on that region. If _should_gray_objects is
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   670
  // true and we're still doing concurrent marking, the region is
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   671
  // pushed on the region stack, if it is located below the global
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   672
  // finger, otherwise we do nothing.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   673
  void grayRegionIfNecessary(MemRegion mr);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   674
  // It's used during evacuation pauses to mark and, if necessary,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   675
  // gray a single object and it's MT-safe. It assumes the caller did
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   676
  // not mark the object. If _should_gray_objects is true and we're
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   677
  // still doing concurrent marking, the objects is pushed on the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   678
  // global stack, if it is located below the global finger, otherwise
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   679
  // we do nothing.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   680
  void markAndGrayObjectIfNecessary(oop p);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   681
5344
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   682
  // It iterates over the heap and for each object it comes across it
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   683
  // will dump the contents of its reference fields, as well as
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   684
  // liveness information for the object and its referents. The dump
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   685
  // will be written to a file with the following name:
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   686
  // G1PrintReachableBaseFile + "." + str. use_prev_marking decides
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   687
  // whether the prev (use_prev_marking == true) or next
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   688
  // (use_prev_marking == false) marking information will be used to
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   689
  // determine the liveness of each object / referent. If all is true,
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   690
  // all objects in the heap will be dumped, otherwise only the live
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   691
  // ones. In the dump the following symbols / abbreviations are used:
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   692
  //   M : an explicitly live object (its bitmap bit is set)
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   693
  //   > : an implicitly live object (over tams)
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   694
  //   O : an object outside the G1 heap (typically: in the perm gen)
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   695
  //   NOT : a reference field whose referent is not live
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   696
  //   AND MARKED : indicates that an object is both explicitly and
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   697
  //   implicitly live (it should be one or the other, not both)
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   698
  void print_reachable(const char* str,
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 5242
diff changeset
   699
                       bool use_prev_marking, bool all) PRODUCT_RETURN;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   700
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   701
  // Clear the next marking bitmap (will be called concurrently).
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   702
  void clearNextBitmap();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   703
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   704
  // main CMS steps and related support
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   705
  void checkpointRootsInitial();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   706
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   707
  // These two do the work that needs to be done before and after the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   708
  // initial root checkpoint. Since this checkpoint can be done at two
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   709
  // different points (i.e. an explicit pause or piggy-backed on a
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   710
  // young collection), then it's nice to be able to easily share the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   711
  // pre/post code. It might be the case that we can put everything in
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   712
  // the post method. TP
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   713
  void checkpointRootsInitialPre();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   714
  void checkpointRootsInitialPost();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   715
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   716
  // Do concurrent phase of marking, to a tentative transitive closure.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   717
  void markFromRoots();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   718
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   719
  // Process all unprocessed SATB buffers. It is called at the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   720
  // beginning of an evacuation pause.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   721
  void drainAllSATBBuffers();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   722
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   723
  void checkpointRootsFinal(bool clear_all_soft_refs);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   724
  void checkpointRootsFinalWork();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   725
  void calcDesiredRegions();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   726
  void cleanup();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   727
  void completeCleanup();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   728
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   729
  // Mark in the previous bitmap.  NB: this is usually read-only, so use
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   730
  // this carefully!
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   731
  void markPrev(oop p);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   732
  void clear(oop p);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   733
  // Clears marks for all objects in the given range, for both prev and
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   734
  // next bitmaps.  NB: the previous bitmap is usually read-only, so use
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   735
  // this carefully!
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   736
  void clearRangeBothMaps(MemRegion mr);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   737
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   738
  // Record the current top of the mark and region stacks; a
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   739
  // subsequent oops_do() on the mark stack and
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   740
  // invalidate_entries_into_cset() on the region stack will iterate
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   741
  // only over indices valid at the time of this call.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   742
  void set_oops_do_bound() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   743
    _markStack.set_oops_do_bound();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   744
    _regionStack.set_oops_do_bound();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   745
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   746
  // Iterate over the oops in the mark stack and all local queues. It
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   747
  // also calls invalidate_entries_into_cset() on the region stack.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   748
  void oops_do(OopClosure* f);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   749
  // It is called at the end of an evacuation pause during marking so
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   750
  // that CM is notified of where the new end of the heap is. It
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   751
  // doesn't do anything if concurrent_marking_in_progress() is false,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   752
  // unless the force parameter is true.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   753
  void update_g1_committed(bool force = false);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   754
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   755
  void complete_marking_in_collection_set();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   756
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   757
  // It indicates that a new collection set is being chosen.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   758
  void newCSet();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   759
  // It registers a collection set heap region with CM. This is used
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   760
  // to determine whether any heap regions are located above the finger.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   761
  void registerCSetRegion(HeapRegion* hr);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   762
5350
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   763
  // Registers the maximum region-end associated with a set of
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   764
  // regions with CM. Again this is used to determine whether any
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   765
  // heap regions are located above the finger.
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   766
  void register_collection_set_finger(HeapWord* max_finger) {
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   767
    // max_finger is the highest heap region end of the regions currently
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   768
    // contained in the collection set. If this value is larger than
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   769
    // _min_finger then we need to gray objects.
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   770
    // This routine is like registerCSetRegion but for an entire
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   771
    // collection of regions.
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   772
    if (max_finger > _min_finger)
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   773
      _should_gray_objects = true;
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   774
  }
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   775
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   776
  // Returns "true" if at least one mark has been completed.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   777
  bool at_least_one_mark_complete() { return _at_least_one_mark_complete; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   778
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   779
  bool isMarked(oop p) const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   780
    assert(p != NULL && p->is_oop(), "expected an oop");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   781
    HeapWord* addr = (HeapWord*)p;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   782
    assert(addr >= _nextMarkBitMap->startWord() ||
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   783
           addr < _nextMarkBitMap->endWord(), "in a region");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   784
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   785
    return _nextMarkBitMap->isMarked(addr);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   786
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   787
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   788
  inline bool not_yet_marked(oop p) const;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   789
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   790
  // XXX Debug code
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   791
  bool containing_card_is_marked(void* p);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   792
  bool containing_cards_are_marked(void* start, void* last);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   793
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   794
  bool isPrevMarked(oop p) const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   795
    assert(p != NULL && p->is_oop(), "expected an oop");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   796
    HeapWord* addr = (HeapWord*)p;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   797
    assert(addr >= _prevMarkBitMap->startWord() ||
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   798
           addr < _prevMarkBitMap->endWord(), "in a region");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   799
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   800
    return _prevMarkBitMap->isMarked(addr);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   801
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   802
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   803
  inline bool do_yield_check(int worker_i = 0);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   804
  inline bool should_yield();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   805
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   806
  // Called to abort the marking cycle after a Full GC takes palce.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   807
  void abort();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   808
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   809
  // This prints the global/local fingers. It is used for debugging.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   810
  NOT_PRODUCT(void print_finger();)
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   811
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   812
  void print_summary_info();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   813
4022
2ec87d5043f7 6885041: G1: inconsistent thread dump
tonyp
parents: 3691
diff changeset
   814
  void print_worker_threads_on(outputStream* st) const;
2ec87d5043f7 6885041: G1: inconsistent thread dump
tonyp
parents: 3691
diff changeset
   815
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   816
  // The following indicate whether a given verbose level has been
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   817
  // set. Notice that anything above stats is conditional to
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   818
  // _MARKING_VERBOSE_ having been set to 1
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   819
  bool verbose_stats()
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   820
    { return _verbose_level >= stats_verbose; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   821
  bool verbose_low()
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   822
    { return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   823
  bool verbose_medium()
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   824
    { return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   825
  bool verbose_high()
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   826
    { return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   827
};
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   828
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   829
// A class representing a marking task.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   830
class CMTask : public TerminatorTerminator {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   831
private:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   832
  enum PrivateConstants {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   833
    // the regular clock call is called once the scanned words reaches
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   834
    // this limit
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   835
    words_scanned_period          = 12*1024,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   836
    // the regular clock call is called once the number of visited
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   837
    // references reaches this limit
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   838
    refs_reached_period           = 384,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   839
    // initial value for the hash seed, used in the work stealing code
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   840
    init_hash_seed                = 17,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   841
    // how many entries will be transferred between global stack and
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   842
    // local queues
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   843
    global_stack_transfer_size    = 16
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   844
  };
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   845
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   846
  int                         _task_id;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   847
  G1CollectedHeap*            _g1h;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   848
  ConcurrentMark*             _cm;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   849
  CMBitMap*                   _nextMarkBitMap;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   850
  // the task queue of this task
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   851
  CMTaskQueue*                _task_queue;
3262
30d1c247fc25 6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents: 2105
diff changeset
   852
private:
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   853
  // the task queue set---needed for stealing
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   854
  CMTaskQueueSet*             _task_queues;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   855
  // indicates whether the task has been claimed---this is only  for
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   856
  // debugging purposes
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   857
  bool                        _claimed;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   858
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   859
  // number of calls to this task
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   860
  int                         _calls;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   861
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   862
  // when the virtual timer reaches this time, the marking step should
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   863
  // exit
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   864
  double                      _time_target_ms;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   865
  // the start time of the current marking step
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   866
  double                      _start_time_ms;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   867
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   868
  // the oop closure used for iterations over oops
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   869
  OopClosure*                 _oop_closure;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   870
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   871
  // the region this task is scanning, NULL if we're not scanning any
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   872
  HeapRegion*                 _curr_region;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   873
  // the local finger of this task, NULL if we're not scanning a region
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   874
  HeapWord*                   _finger;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   875
  // limit of the region this task is scanning, NULL if we're not scanning one
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   876
  HeapWord*                   _region_limit;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   877
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   878
  // This is used only when we scan regions popped from the region
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   879
  // stack. It records what the last object on such a region we
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   880
  // scanned was. It is used to ensure that, if we abort region
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   881
  // iteration, we do not rescan the first part of the region. This
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   882
  // should be NULL when we're not scanning a region from the region
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   883
  // stack.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   884
  HeapWord*                   _region_finger;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   885
6761
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   886
  // If we abort while scanning a region we record the remaining
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   887
  // unscanned portion and check this field when marking restarts.
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   888
  // This avoids having to push on the region stack while other
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   889
  // marking threads may still be popping regions.
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   890
  // If we were to push the unscanned portion directly to the
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   891
  // region stack then we would need to using locking versions
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   892
  // of the push and pop operations.
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   893
  MemRegion                   _aborted_region;
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
   894
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   895
  // the number of words this task has scanned
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   896
  size_t                      _words_scanned;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   897
  // When _words_scanned reaches this limit, the regular clock is
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   898
  // called. Notice that this might be decreased under certain
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   899
  // circumstances (i.e. when we believe that we did an expensive
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   900
  // operation).
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   901
  size_t                      _words_scanned_limit;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   902
  // the initial value of _words_scanned_limit (i.e. what it was
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   903
  // before it was decreased).
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   904
  size_t                      _real_words_scanned_limit;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   905
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   906
  // the number of references this task has visited
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   907
  size_t                      _refs_reached;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   908
  // When _refs_reached reaches this limit, the regular clock is
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   909
  // called. Notice this this might be decreased under certain
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   910
  // circumstances (i.e. when we believe that we did an expensive
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   911
  // operation).
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   912
  size_t                      _refs_reached_limit;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   913
  // the initial value of _refs_reached_limit (i.e. what it was before
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   914
  // it was decreased).
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   915
  size_t                      _real_refs_reached_limit;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   916
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   917
  // used by the work stealing stuff
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   918
  int                         _hash_seed;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   919
  // if this is true, then the task has aborted for some reason
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   920
  bool                        _has_aborted;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   921
  // set when the task aborts because it has met its time quota
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   922
  bool                        _has_aborted_timed_out;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   923
  // true when we're draining SATB buffers; this avoids the task
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   924
  // aborting due to SATB buffers being available (as we're already
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   925
  // dealing with them)
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   926
  bool                        _draining_satb_buffers;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   927
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   928
  // number sequence of past step times
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   929
  NumberSeq                   _step_times_ms;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   930
  // elapsed time of this task
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   931
  double                      _elapsed_time_ms;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   932
  // termination time of this task
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   933
  double                      _termination_time_ms;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   934
  // when this task got into the termination protocol
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   935
  double                      _termination_start_time_ms;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   936
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   937
  // true when the task is during a concurrent phase, false when it is
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   938
  // in the remark phase (so, in the latter case, we do not have to
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   939
  // check all the things that we have to check during the concurrent
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   940
  // phase, i.e. SATB buffer availability...)
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   941
  bool                        _concurrent;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   942
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   943
  TruncatedSeq                _marking_step_diffs_ms;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   944
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   945
  // LOTS of statistics related with this task
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   946
#if _MARKING_STATS_
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   947
  NumberSeq                   _all_clock_intervals_ms;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   948
  double                      _interval_start_time_ms;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   949
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   950
  int                         _aborted;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   951
  int                         _aborted_overflow;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   952
  int                         _aborted_cm_aborted;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   953
  int                         _aborted_yield;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   954
  int                         _aborted_timed_out;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   955
  int                         _aborted_satb;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   956
  int                         _aborted_termination;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   957
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   958
  int                         _steal_attempts;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   959
  int                         _steals;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   960
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   961
  int                         _clock_due_to_marking;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   962
  int                         _clock_due_to_scanning;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   963
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   964
  int                         _local_pushes;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   965
  int                         _local_pops;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   966
  int                         _local_max_size;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   967
  int                         _objs_scanned;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   968
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   969
  int                         _global_pushes;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   970
  int                         _global_pops;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   971
  int                         _global_max_size;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   972
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   973
  int                         _global_transfers_to;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   974
  int                         _global_transfers_from;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   975
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   976
  int                         _region_stack_pops;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   977
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   978
  int                         _regions_claimed;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   979
  int                         _objs_found_on_bitmap;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   980
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   981
  int                         _satb_buffers_processed;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   982
#endif // _MARKING_STATS_
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   983
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   984
  // it updates the local fields after this task has claimed
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   985
  // a new region to scan
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   986
  void setup_for_region(HeapRegion* hr);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   987
  // it brings up-to-date the limit of the region
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   988
  void update_region_limit();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   989
  // it resets the local fields after a task has finished scanning a
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   990
  // region
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   991
  void giveup_current_region();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   992
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   993
  // called when either the words scanned or the refs visited limit
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   994
  // has been reached
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   995
  void reached_limit();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   996
  // recalculates the words scanned and refs visited limits
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   997
  void recalculate_limits();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   998
  // decreases the words scanned and refs visited limits when we reach
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   999
  // an expensive operation
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1000
  void decrease_limits();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1001
  // it checks whether the words scanned or refs visited reached their
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1002
  // respective limit and calls reached_limit() if they have
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1003
  void check_limits() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1004
    if (_words_scanned >= _words_scanned_limit ||
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1005
        _refs_reached >= _refs_reached_limit)
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1006
      reached_limit();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1007
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1008
  // this is supposed to be called regularly during a marking step as
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1009
  // it checks a bunch of conditions that might cause the marking step
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1010
  // to abort
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1011
  void regular_clock_call();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1012
  bool concurrent() { return _concurrent; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1013
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1014
public:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1015
  // It resets the task; it should be called right at the beginning of
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1016
  // a marking phase.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1017
  void reset(CMBitMap* _nextMarkBitMap);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1018
  // it clears all the fields that correspond to a claimed region.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1019
  void clear_region_fields();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1020
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1021
  void set_concurrent(bool concurrent) { _concurrent = concurrent; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1022
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1023
  // The main method of this class which performs a marking step
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1024
  // trying not to exceed the given duration. However, it might exit
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1025
  // prematurely, according to some conditions (i.e. SATB buffers are
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1026
  // available for processing).
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1027
  void do_marking_step(double target_ms);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1028
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1029
  // These two calls start and stop the timer
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1030
  void record_start_time() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1031
    _elapsed_time_ms = os::elapsedTime() * 1000.0;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1032
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1033
  void record_end_time() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1034
    _elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1035
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1036
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1037
  // returns the task ID
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1038
  int task_id() { return _task_id; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1039
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1040
  // From TerminatorTerminator. It determines whether this task should
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1041
  // exit the termination protocol after it's entered it.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1042
  virtual bool should_exit_termination();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1043
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1044
  HeapWord* finger()            { return _finger; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1045
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1046
  bool has_aborted()            { return _has_aborted; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1047
  void set_has_aborted()        { _has_aborted = true; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1048
  void clear_has_aborted()      { _has_aborted = false; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1049
  bool claimed() { return _claimed; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1050
6761
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
  1051
  // Support routines for the partially scanned region that may be
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
  1052
  // recorded as a result of aborting while draining the CMRegionStack
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
  1053
  MemRegion aborted_region()    { return _aborted_region; }
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
  1054
  void set_aborted_region(MemRegion mr)
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
  1055
                                { _aborted_region = mr; }
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
  1056
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
  1057
  // Clears any recorded partially scanned region
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
  1058
  void clear_aborted_region()   { set_aborted_region(MemRegion()); }
f9191297ce83 6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents: 5547
diff changeset
  1059
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1060
  void set_oop_closure(OopClosure* oop_closure) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1061
    _oop_closure = oop_closure;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1062
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1063
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1064
  // It grays the object by marking it and, if necessary, pushing it
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1065
  // on the local queue
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1066
  void deal_with_reference(oop obj);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1067
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1068
  // It scans an object and visits its children.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1069
  void scan_object(oop obj) {
4026
10386ea70fe5 6888619: G1: too many guarantees in concurrent marking
tonyp
parents: 4022
diff changeset
  1070
    assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant");
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1071
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1072
    if (_cm->verbose_high())
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1073
      gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1074
                             _task_id, (void*) obj);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1075
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1076
    size_t obj_size = obj->size();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1077
    _words_scanned += obj_size;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1078
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1079
    obj->oop_iterate(_oop_closure);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1080
    statsOnly( ++_objs_scanned );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1081
    check_limits();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1082
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1083
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1084
  // It pushes an object on the local queue.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1085
  void push(oop obj);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1086
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1087
  // These two move entries to/from the global stack.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1088
  void move_entries_to_global_stack();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1089
  void get_entries_from_global_stack();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1090
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1091
  // It pops and scans objects from the local queue. If partially is
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1092
  // true, then it stops when the queue size is of a given limit. If
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1093
  // partially is false, then it stops when the queue is empty.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1094
  void drain_local_queue(bool partially);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1095
  // It moves entries from the global stack to the local queue and
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1096
  // drains the local queue. If partially is true, then it stops when
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1097
  // both the global stack and the local queue reach a given size. If
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1098
  // partially if false, it tries to empty them totally.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1099
  void drain_global_stack(bool partially);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1100
  // It keeps picking SATB buffers and processing them until no SATB
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1101
  // buffers are available.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1102
  void drain_satb_buffers();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1103
  // It keeps popping regions from the region stack and processing
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1104
  // them until the region stack is empty.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1105
  void drain_region_stack(BitMapClosure* closure);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1106
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1107
  // moves the local finger to a new location
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1108
  inline void move_finger_to(HeapWord* new_finger) {
4026
10386ea70fe5 6888619: G1: too many guarantees in concurrent marking
tonyp
parents: 4022
diff changeset
  1109
    assert(new_finger >= _finger && new_finger < _region_limit, "invariant");
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1110
    _finger = new_finger;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1111
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1112
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1113
  // moves the region finger to a new location
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1114
  inline void move_region_finger_to(HeapWord* new_finger) {
4026
10386ea70fe5 6888619: G1: too many guarantees in concurrent marking
tonyp
parents: 4022
diff changeset
  1115
    assert(new_finger < _cm->finger(), "invariant");
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1116
    _region_finger = new_finger;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1117
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1118
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1119
  CMTask(int task_num, ConcurrentMark *cm,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1120
         CMTaskQueue* task_queue, CMTaskQueueSet* task_queues);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1121
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1122
  // it prints statistics associated with this task
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1123
  void print_stats();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1124
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1125
#if _MARKING_STATS_
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1126
  void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1127
#endif // _MARKING_STATS_
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1128
};
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6761
diff changeset
  1129
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6761
diff changeset
  1130
#endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP