rev 9740 : imported patch 8145674-fix-includes-and-forward-declarations-in-g1remset-files
rev 9741 : [mq]: 8145674-vsimonis

   1 /*
   2  * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
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  23  */
  24 
  25 #ifndef SHARE_VM_GC_G1_G1REMSET_HPP
  26 #define SHARE_VM_GC_G1_G1REMSET_HPP
  27 
  28 #include "gc/g1/dirtyCardQueue.hpp"
  29 #include "gc/g1/g1RemSetSummary.hpp"
  30 #include "gc/g1/heapRegion.hpp"
  31 #include "memory/allocation.hpp"
  32 #include "memory/iterator.hpp"
  33 
  34 // A G1RemSet provides ways of iterating over pointers into a selected
  35 // collection set.
  36 
  37 class BitMap;
  38 class CardTableModRefBS;
  39 class G1BlockOffsetSharedArray;
  40 class ConcurrentG1Refine;
  41 class CodeBlobClosure;
  42 class G1CollectedHeap;
  43 class G1CollectorPolicy;
  44 class G1ParPushHeapRSClosure;
  45 class G1SATBCardTableModRefBS;
  46 class HeapRegionClaimer;
  47 
  48 // A G1RemSet in which each heap region has a rem set that records the
  49 // external heap references into it.  Uses a mod ref bs to track updates,
  50 // so that they can be used to update the individual region remsets.
  51 
  52 class G1RemSet: public CHeapObj<mtGC> {
  53 private:
  54   G1RemSetSummary _prev_period_summary;
  55 
  56   // A DirtyCardQueueSet that is used to hold cards that contain
  57   // references into the current collection set. This is used to
  58   // update the remembered sets of the regions in the collection
  59   // set in the event of an evacuation failure.
  60   DirtyCardQueueSet _into_cset_dirty_card_queue_set;
  61 
  62 protected:
  63   G1CollectedHeap* _g1;
  64   size_t _conc_refine_cards;
  65   uint n_workers();
  66 
  67 protected:
  68   CardTableModRefBS*     _ct_bs;
  69   G1CollectorPolicy*     _g1p;
  70 
  71   ConcurrentG1Refine*    _cg1r;
  72 
  73   // Used for caching the closure that is responsible for scanning
  74   // references into the collection set.
  75   G1ParPushHeapRSClosure** _cset_rs_update_cl;
  76 
  77 public:
  78   // This is called to reset dual hash tables after the gc pause
  79   // is finished and the initial hash table is no longer being
  80   // scanned.
  81   void cleanupHRRS();
  82 
  83   G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs);
  84   ~G1RemSet();
  85 
  86   // Invoke "blk->do_oop" on all pointers into the collection set
  87   // from objects in regions outside the collection set (having
  88   // invoked "blk->set_region" to set the "from" region correctly
  89   // beforehand.)
  90   //
  91   // Apply non_heap_roots on the oops of the unmarked nmethods
  92   // on the strong code roots list for each region in the
  93   // collection set.
  94   //
  95   // The "worker_i" param is for the parallel case where the id
  96   // of the worker thread calling this function can be helpful in
  97   // partitioning the work to be done. It should be the same as
  98   // the "i" passed to the calling thread's work(i) function.
  99   // In the sequential case this param will be ignored.
 100   //
 101   // Returns the number of cards scanned while looking for pointers
 102   // into the collection set.
 103   size_t oops_into_collection_set_do(G1ParPushHeapRSClosure* blk,
 104                                      CodeBlobClosure* heap_region_codeblobs,
 105                                      uint worker_i);
 106 
 107   // Prepare for and cleanup after an oops_into_collection_set_do
 108   // call.  Must call each of these once before and after (in sequential
 109   // code) any threads call oops_into_collection_set_do.  (This offers an
 110   // opportunity to sequential setup and teardown of structures needed by a
 111   // parallel iteration over the CS's RS.)
 112   void prepare_for_oops_into_collection_set_do();
 113   void cleanup_after_oops_into_collection_set_do();
 114 
 115   size_t scanRS(G1ParPushHeapRSClosure* oc,
 116                 CodeBlobClosure* heap_region_codeblobs,
 117                 uint worker_i);
 118 
 119   void updateRS(DirtyCardQueue* into_cset_dcq, uint worker_i);
 120 
 121   CardTableModRefBS* ct_bs() { return _ct_bs; }
 122 
 123   // Record, if necessary, the fact that *p (where "p" is in region "from",
 124   // which is required to be non-NULL) has changed to a new non-NULL value.
 125   template <class T> void par_write_ref(HeapRegion* from, T* p, uint tid);
 126 
 127   // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region
 128   // or card, respectively, such that a region or card with a corresponding
 129   // 0 bit contains no part of any live object.  Eliminates any remembered
 130   // set entries that correspond to dead heap ranges. "worker_num" is the
 131   // parallel thread id of the current thread, and "hrclaimer" is the
 132   // HeapRegionClaimer that should be used.
 133   void scrub(BitMap* region_bm, BitMap* card_bm, uint worker_num, HeapRegionClaimer* hrclaimer);
 134 
 135   // Refine the card corresponding to "card_ptr".
 136   // If check_for_refs_into_cset is true, a true result is returned
 137   // if the given card contains oops that have references into the
 138   // current collection set.
 139   virtual bool refine_card(jbyte* card_ptr,
 140                            uint worker_i,
 141                            bool check_for_refs_into_cset);
 142 
 143   // Print accumulated summary info from the start of the VM.
 144   virtual void print_summary_info();
 145 
 146   // Print accumulated summary info from the last time called.
 147   virtual void print_periodic_summary_info(const char* header, uint period_count);
 148 
 149   // Prepare remembered set for verification.
 150   virtual void prepare_for_verify();
 151 
 152   size_t conc_refine_cards() const {
 153     return _conc_refine_cards;
 154   }
 155 };
 156 
 157 class ScanRSClosure : public HeapRegionClosure {
 158   size_t _cards_done, _cards;
 159   G1CollectedHeap* _g1h;
 160 
 161   G1ParPushHeapRSClosure* _oc;
 162   CodeBlobClosure* _code_root_cl;
 163 
 164   G1BlockOffsetSharedArray* _bot_shared;
 165   G1SATBCardTableModRefBS *_ct_bs;
 166 
 167   double _strong_code_root_scan_time_sec;
 168   uint   _worker_i;
 169   size_t _block_size;
 170   bool   _try_claimed;
 171 
 172 public:
 173   ScanRSClosure(G1ParPushHeapRSClosure* oc,
 174                 CodeBlobClosure* code_root_cl,
 175                 uint worker_i);
 176 
 177   bool doHeapRegion(HeapRegion* r);
 178 
 179   double strong_code_root_scan_time_sec() {
 180     return _strong_code_root_scan_time_sec;
 181   }
 182   size_t cards_done() { return _cards_done;}
 183   size_t cards_looked_up() { return _cards;}
 184   void set_try_claimed() { _try_claimed = true; }
 185 private:
 186   void scanCard(size_t index, HeapRegion *r);
 187   void printCard(HeapRegion* card_region, size_t card_index,
 188                  HeapWord* card_start);
 189   void scan_strong_code_roots(HeapRegion* r);
 190 };
 191 
 192 class UpdateRSOopClosure: public ExtendedOopClosure {
 193   HeapRegion* _from;
 194   G1RemSet* _rs;
 195   uint _worker_i;
 196 
 197   template <class T> void do_oop_work(T* p);
 198 
 199 public:
 200   UpdateRSOopClosure(G1RemSet* rs, uint worker_i = 0) :
 201     _from(NULL), _rs(rs), _worker_i(worker_i)
 202   {}
 203 
 204   void set_from(HeapRegion* from) {
 205     assert(from != NULL, "from region must be non-NULL");
 206     _from = from;
 207   }
 208 
 209   virtual void do_oop(narrowOop* p) { do_oop_work(p); }
 210   virtual void do_oop(oop* p)       { do_oop_work(p); }
 211 };
 212 
 213 #endif // SHARE_VM_GC_G1_G1REMSET_HPP
--- EOF ---