hotspot/src/share/vm/gc_implementation/g1/g1RemSet.hpp
author iveresov
Fri, 06 Mar 2009 13:50:14 -0800
changeset 2142 032f4652700c
parent 2013 49e915da0905
child 2152 99356e7f31b1
permissions -rw-r--r--
6720309: G1: don't synchronously update RSet during evacuation pauses 6720334: G1: don't update RSets of collection set regions during an evacuation pause Summary: Introduced a deferred update mechanism for delaying the rset updates during the collection pause Reviewed-by: apetrusenko, tonyp
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/*
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 * Copyright 2001-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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// A G1RemSet provides ways of iterating over pointers into a selected
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// collection set.
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class G1CollectedHeap;
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class CardTableModRefBarrierSet;
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class HRInto_G1RemSet;
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class ConcurrentG1Refine;
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class G1RemSet: public CHeapObj {
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protected:
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  G1CollectedHeap* _g1;
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  unsigned _conc_refine_traversals;
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  unsigned _conc_refine_cards;
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  size_t n_workers();
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public:
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  G1RemSet(G1CollectedHeap* g1) :
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    _g1(g1), _conc_refine_traversals(0), _conc_refine_cards(0)
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  {}
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  // Invoke "blk->do_oop" on all pointers into the CS in object in regions
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  // outside the CS (having invoked "blk->set_region" to set the "from"
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  // region correctly beforehand.) The "worker_i" param is for the
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  // parallel case where the number of the worker thread calling this
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  // function can be helpful in partitioning the work to be done. It
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  // should be the same as the "i" passed to the calling thread's
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  // work(i) function. In the sequential case this param will be ingored.
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  virtual void oops_into_collection_set_do(OopsInHeapRegionClosure* blk,
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                                           int worker_i) = 0;
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  // Prepare for and cleanup after an oops_into_collection_set_do
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  // call.  Must call each of these once before and after (in sequential
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  // code) any threads call oops into collection set do.  (This offers an
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  // opportunity to sequential setup and teardown of structures needed by a
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  // parallel iteration over the CS's RS.)
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  virtual void prepare_for_oops_into_collection_set_do() = 0;
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  virtual void cleanup_after_oops_into_collection_set_do() = 0;
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  // If "this" is of the given subtype, return "this", else "NULL".
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  virtual HRInto_G1RemSet* as_HRInto_G1RemSet() { return NULL; }
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  // Record, if necessary, the fact that *p (where "p" is in region "from")
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  // has changed to its new value.
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  virtual void write_ref(HeapRegion* from, oop* p) = 0;
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  virtual void par_write_ref(HeapRegion* from, oop* p, int tid) = 0;
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  // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region
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  // or card, respectively, such that a region or card with a corresponding
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  // 0 bit contains no part of any live object.  Eliminates any remembered
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  // set entries that correspond to dead heap ranges.
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  virtual void scrub(BitMap* region_bm, BitMap* card_bm) = 0;
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  // Like the above, but assumes is called in parallel: "worker_num" is the
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  // parallel thread id of the current thread, and "claim_val" is the
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  // value that should be used to claim heap regions.
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  virtual void scrub_par(BitMap* region_bm, BitMap* card_bm,
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                         int worker_num, int claim_val) = 0;
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  // Do any "refinement" activity that might be appropriate to the given
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  // G1RemSet.  If "refinement" has iterateive "passes", do one pass.
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  // If "t" is non-NULL, it is the thread performing the refinement.
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  // Default implementation does nothing.
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  virtual void concurrentRefinementPass(ConcurrentG1Refine* cg1r) {}
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  // Refine the card corresponding to "card_ptr".  If "sts" is non-NULL,
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  // join and leave around parts that must be atomic wrt GC.  (NULL means
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  // being done at a safepoint.)
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  virtual void concurrentRefineOneCard(jbyte* card_ptr, int worker_i) {}
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  unsigned conc_refine_cards() { return _conc_refine_cards; }
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  // Print any relevant summary info.
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  virtual void print_summary_info() {}
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  // Prepare remebered set for verification.
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  virtual void prepare_for_verify() {};
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};
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// The simplest possible G1RemSet: iterates over all objects in non-CS
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// regions, searching for pointers into the CS.
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class StupidG1RemSet: public G1RemSet {
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  StupidG1RemSet(G1CollectedHeap* g1) : G1RemSet(g1) {}
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  void oops_into_collection_set_do(OopsInHeapRegionClosure* blk,
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                                   int worker_i);
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  void prepare_for_oops_into_collection_set_do() {}
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  void cleanup_after_oops_into_collection_set_do() {}
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  // Nothing is necessary in the version below.
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  void write_ref(HeapRegion* from, oop* p) {}
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  void par_write_ref(HeapRegion* from, oop* p, int tid) {}
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  void scrub(BitMap* region_bm, BitMap* card_bm) {}
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  void scrub_par(BitMap* region_bm, BitMap* card_bm,
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                 int worker_num, int claim_val) {}
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};
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// A G1RemSet in which each heap region has a rem set that records the
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// external heap references into it.  Uses a mod ref bs to track updates,
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// so that they can be used to update the individual region remsets.
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class HRInto_G1RemSet: public G1RemSet {
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protected:
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  enum SomePrivateConstants {
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    UpdateRStoMergeSync  = 0,
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    MergeRStoDoDirtySync = 1,
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    DoDirtySync          = 2,
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    LastSync             = 3,
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    SeqTask              = 0,
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    NumSeqTasks          = 1
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  };
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  CardTableModRefBS*             _ct_bs;
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  SubTasksDone*                  _seq_task;
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  G1CollectorPolicy* _g1p;
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  ConcurrentG1Refine* _cg1r;
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  size_t*             _cards_scanned;
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  size_t              _total_cards_scanned;
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  // _par_traversal_in_progress is "true" iff a parallel traversal is in
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  // progress.  If so, then cards added to remembered sets should also have
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  // their references into the collection summarized in "_new_refs".
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  bool _par_traversal_in_progress;
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  void set_par_traversal(bool b);
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  GrowableArray<oop*>** _new_refs;
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  void new_refs_iterate(OopClosure* cl);
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public:
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  // This is called to reset dual hash tables after the gc pause
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  // is finished and the initial hash table is no longer being
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  // scanned.
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  void cleanupHRRS();
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  HRInto_G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs);
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  ~HRInto_G1RemSet();
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  void oops_into_collection_set_do(OopsInHeapRegionClosure* blk,
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                                   int worker_i);
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  void prepare_for_oops_into_collection_set_do();
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  void cleanup_after_oops_into_collection_set_do();
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  void scanRS(OopsInHeapRegionClosure* oc, int worker_i);
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  void scanNewRefsRS(OopsInHeapRegionClosure* oc, int worker_i);
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  void updateRS(int worker_i);
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  HeapRegion* calculateStartRegion(int i);
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  HRInto_G1RemSet* as_HRInto_G1RemSet() { return this; }
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  CardTableModRefBS* ct_bs() { return _ct_bs; }
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  size_t cardsScanned() { return _total_cards_scanned; }
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  // Record, if necessary, the fact that *p (where "p" is in region "from",
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  // which is required to be non-NULL) has changed to a new non-NULL value.
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  inline void write_ref(HeapRegion* from, oop* p);
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  // The "_nv" version is the same; it exists just so that it is not virtual.
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  inline void write_ref_nv(HeapRegion* from, oop* p);
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  inline bool self_forwarded(oop obj);
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  inline void par_write_ref(HeapRegion* from, oop* p, int tid);
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  void scrub(BitMap* region_bm, BitMap* card_bm);
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  void scrub_par(BitMap* region_bm, BitMap* card_bm,
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                 int worker_num, int claim_val);
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  virtual void concurrentRefinementPass(ConcurrentG1Refine* t);
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  virtual void concurrentRefineOneCard(jbyte* card_ptr, int worker_i);
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  virtual void print_summary_info();
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  virtual void prepare_for_verify();
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};
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#define G1_REM_SET_LOGGING 0
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class CountNonCleanMemRegionClosure: public MemRegionClosure {
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  G1CollectedHeap* _g1;
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  int _n;
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  HeapWord* _start_first;
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  CountNonCleanMemRegionClosure(G1CollectedHeap* g1) :
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    _g1(g1), _n(0), _start_first(NULL)
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  {}
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  void do_MemRegion(MemRegion mr);
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  int n() { return _n; };
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  HeapWord* start_first() { return _start_first; }
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};