annotate hotspot/src/share/vm/gc_implementation/g1/g1RemSet.hpp @ 13195:be27e1b6a4b9

6995781: Native Memory Tracking (Phase 1) 7151532: DCmd for hotspot native memory tracking Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd Reviewed-by: acorn, coleenp, fparain
author zgu
date Thu, 28 Jun 2012 17:03:16 -0400
parents ccc217c177ee
children 882756847a04
rev   line source
ysr@1374 1 /*
johnc@11586 2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
ysr@1374 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ysr@1374 4 *
ysr@1374 5 * This code is free software; you can redistribute it and/or modify it
ysr@1374 6 * under the terms of the GNU General Public License version 2 only, as
ysr@1374 7 * published by the Free Software Foundation.
ysr@1374 8 *
ysr@1374 9 * This code is distributed in the hope that it will be useful, but WITHOUT
ysr@1374 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ysr@1374 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
ysr@1374 12 * version 2 for more details (a copy is included in the LICENSE file that
ysr@1374 13 * accompanied this code).
ysr@1374 14 *
ysr@1374 15 * You should have received a copy of the GNU General Public License version
ysr@1374 16 * 2 along with this work; if not, write to the Free Software Foundation,
ysr@1374 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ysr@1374 18 *
trims@5547 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@5547 20 * or visit www.oracle.com if you need additional information or have any
trims@5547 21 * questions.
ysr@1374 22 *
ysr@1374 23 */
ysr@1374 24
stefank@7397 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP
stefank@7397 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP
stefank@7397 27
ysr@1374 28 // A G1RemSet provides ways of iterating over pointers into a selected
ysr@1374 29 // collection set.
ysr@1374 30
ysr@1374 31 class G1CollectedHeap;
ysr@1374 32 class CardTableModRefBarrierSet;
ysr@1374 33 class ConcurrentG1Refine;
ysr@1374 34
johnc@6958 35 // A G1RemSet in which each heap region has a rem set that records the
johnc@6958 36 // external heap references into it. Uses a mod ref bs to track updates,
johnc@6958 37 // so that they can be used to update the individual region remsets.
johnc@6958 38
zgu@13195 39 class G1RemSet: public CHeapObj<mtGC> {
ysr@1374 40 protected:
ysr@1374 41 G1CollectedHeap* _g1;
ysr@1374 42 unsigned _conc_refine_cards;
jmasa@11396 43 uint n_workers();
ysr@1374 44
ysr@1374 45 protected:
ysr@1374 46 enum SomePrivateConstants {
ysr@1374 47 UpdateRStoMergeSync = 0,
ysr@1374 48 MergeRStoDoDirtySync = 1,
ysr@1374 49 DoDirtySync = 2,
ysr@1374 50 LastSync = 3,
ysr@1374 51
ysr@1374 52 SeqTask = 0,
ysr@1374 53 NumSeqTasks = 1
ysr@1374 54 };
ysr@1374 55
ysr@1374 56 CardTableModRefBS* _ct_bs;
ysr@1374 57 SubTasksDone* _seq_task;
ysr@1374 58 G1CollectorPolicy* _g1p;
ysr@1374 59
ysr@1374 60 ConcurrentG1Refine* _cg1r;
ysr@1374 61
ysr@1374 62 size_t* _cards_scanned;
ysr@1374 63 size_t _total_cards_scanned;
ysr@1374 64
johnc@6247 65 // Used for caching the closure that is responsible for scanning
johnc@6247 66 // references into the collection set.
johnc@6247 67 OopsInHeapRegionClosure** _cset_rs_update_cl;
ysr@3262 68
johnc@3590 69 // The routine that performs the actual work of refining a dirty
johnc@3590 70 // card.
johnc@6247 71 // If check_for_refs_into_refs is true then a true result is returned
johnc@6247 72 // if the card contains oops that have references into the current
johnc@6247 73 // collection set.
johnc@6247 74 bool concurrentRefineOneCard_impl(jbyte* card_ptr, int worker_i,
johnc@6247 75 bool check_for_refs_into_cset);
johnc@3590 76
ysr@1374 77 public:
ysr@1374 78 // This is called to reset dual hash tables after the gc pause
ysr@1374 79 // is finished and the initial hash table is no longer being
ysr@1374 80 // scanned.
ysr@1374 81 void cleanupHRRS();
ysr@1374 82
johnc@6958 83 G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs);
johnc@6958 84 ~G1RemSet();
ysr@1374 85
johnc@6958 86 // Invoke "blk->do_oop" on all pointers into the CS in objects in regions
johnc@6958 87 // outside the CS (having invoked "blk->set_region" to set the "from"
johnc@6958 88 // region correctly beforehand.) The "worker_i" param is for the
johnc@6958 89 // parallel case where the number of the worker thread calling this
johnc@6958 90 // function can be helpful in partitioning the work to be done. It
johnc@6958 91 // should be the same as the "i" passed to the calling thread's
johnc@6958 92 // work(i) function. In the sequential case this param will be ingored.
ysr@1374 93 void oops_into_collection_set_do(OopsInHeapRegionClosure* blk,
ysr@1374 94 int worker_i);
ysr@1374 95
johnc@6958 96 // Prepare for and cleanup after an oops_into_collection_set_do
johnc@6958 97 // call. Must call each of these once before and after (in sequential
johnc@6958 98 // code) any threads call oops_into_collection_set_do. (This offers an
johnc@6958 99 // opportunity to sequential setup and teardown of structures needed by a
johnc@6958 100 // parallel iteration over the CS's RS.)
ysr@1374 101 void prepare_for_oops_into_collection_set_do();
ysr@1374 102 void cleanup_after_oops_into_collection_set_do();
johnc@6958 103
ysr@1374 104 void scanRS(OopsInHeapRegionClosure* oc, int worker_i);
johnc@6247 105 void updateRS(DirtyCardQueue* into_cset_dcq, int worker_i);
johnc@6958 106
ysr@1374 107 CardTableModRefBS* ct_bs() { return _ct_bs; }
ysr@1374 108 size_t cardsScanned() { return _total_cards_scanned; }
ysr@1374 109
ysr@1374 110 // Record, if necessary, the fact that *p (where "p" is in region "from",
ysr@1374 111 // which is required to be non-NULL) has changed to a new non-NULL value.
johnc@7385 112 template <class T> void write_ref(HeapRegion* from, T* p);
johnc@7385 113 template <class T> void par_write_ref(HeapRegion* from, T* p, int tid);
ysr@1374 114
johnc@6958 115 // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region
johnc@6958 116 // or card, respectively, such that a region or card with a corresponding
johnc@6958 117 // 0 bit contains no part of any live object. Eliminates any remembered
johnc@6958 118 // set entries that correspond to dead heap ranges.
ysr@1374 119 void scrub(BitMap* region_bm, BitMap* card_bm);
johnc@6958 120
johnc@6958 121 // Like the above, but assumes is called in parallel: "worker_num" is the
johnc@6958 122 // parallel thread id of the current thread, and "claim_val" is the
johnc@6958 123 // value that should be used to claim heap regions.
ysr@1374 124 void scrub_par(BitMap* region_bm, BitMap* card_bm,
jmasa@11396 125 uint worker_num, int claim_val);
ysr@1374 126
johnc@6958 127 // Refine the card corresponding to "card_ptr". If "sts" is non-NULL,
johnc@6958 128 // join and leave around parts that must be atomic wrt GC. (NULL means
johnc@6958 129 // being done at a safepoint.)
johnc@6958 130 // If check_for_refs_into_cset is true, a true result is returned
johnc@6958 131 // if the given card contains oops that have references into the
johnc@6958 132 // current collection set.
johnc@6247 133 virtual bool concurrentRefineOneCard(jbyte* card_ptr, int worker_i,
johnc@6247 134 bool check_for_refs_into_cset);
ysr@1374 135
johnc@6958 136 // Print any relevant summary info.
ysr@1374 137 virtual void print_summary_info();
johnc@6958 138
johnc@6958 139 // Prepare remembered set for verification.
ysr@1374 140 virtual void prepare_for_verify();
ysr@1374 141 };
ysr@1374 142
ysr@1374 143 class CountNonCleanMemRegionClosure: public MemRegionClosure {
ysr@1374 144 G1CollectedHeap* _g1;
ysr@1374 145 int _n;
ysr@1374 146 HeapWord* _start_first;
ysr@1374 147 public:
ysr@1374 148 CountNonCleanMemRegionClosure(G1CollectedHeap* g1) :
ysr@1374 149 _g1(g1), _n(0), _start_first(NULL)
ysr@1374 150 {}
ysr@1374 151 void do_MemRegion(MemRegion mr);
ysr@1374 152 int n() { return _n; };
ysr@1374 153 HeapWord* start_first() { return _start_first; }
ysr@1374 154 };
apetrusenko@2152 155
apetrusenko@2152 156 class UpdateRSOopClosure: public OopClosure {
apetrusenko@2152 157 HeapRegion* _from;
johnc@6958 158 G1RemSet* _rs;
apetrusenko@2152 159 int _worker_i;
ysr@3262 160
ysr@3262 161 template <class T> void do_oop_work(T* p);
ysr@3262 162
apetrusenko@2152 163 public:
johnc@6958 164 UpdateRSOopClosure(G1RemSet* rs, int worker_i = 0) :
johnc@7385 165 _from(NULL), _rs(rs), _worker_i(worker_i)
johnc@7385 166 {}
apetrusenko@2152 167
apetrusenko@2152 168 void set_from(HeapRegion* from) {
apetrusenko@2152 169 assert(from != NULL, "from region must be non-NULL");
apetrusenko@2152 170 _from = from;
apetrusenko@2152 171 }
apetrusenko@2152 172
ysr@3262 173 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
ysr@3262 174 virtual void do_oop(oop* p) { do_oop_work(p); }
apetrusenko@2152 175
apetrusenko@2152 176 // Override: this closure is idempotent.
apetrusenko@2152 177 // bool idempotent() { return true; }
apetrusenko@2152 178 bool apply_to_weak_ref_discovered_field() { return true; }
apetrusenko@2152 179 };
johnc@6247 180
johnc@6247 181 class UpdateRSetImmediate: public OopsInHeapRegionClosure {
johnc@6247 182 private:
johnc@6247 183 G1RemSet* _g1_rem_set;
johnc@6247 184
johnc@6247 185 template <class T> void do_oop_work(T* p);
johnc@6247 186 public:
johnc@6247 187 UpdateRSetImmediate(G1RemSet* rs) :
johnc@6247 188 _g1_rem_set(rs) {}
johnc@6247 189
johnc@6247 190 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
johnc@6247 191 virtual void do_oop( oop* p) { do_oop_work(p); }
johnc@6247 192 };
johnc@7385 193
stefank@7397 194
stefank@7397 195 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP