annotate hotspot/src/share/vm/gc/g1/g1RemSet.hpp @ 46572:fef0d64b2263

8175554: Improve G1UpdateRSOrPushRefClosure Summary: Micro-optimizations and improving naming for the G1UpdateRSOrPushRefClosure Reviewed-by: ehelin, sangheki
author tschatzl
date Wed, 28 Jun 2017 10:58:19 +0200
parents c70b36f0730d
children d6fb8a7a7843
rev   line source
ysr@1374 1 /*
jprovino@46291 2 * Copyright (c) 2001, 2017, 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
pliden@30764 25 #ifndef SHARE_VM_GC_G1_G1REMSET_HPP
pliden@30764 26 #define SHARE_VM_GC_G1_G1REMSET_HPP
stefank@7397 27
tschatzl@35198 28 #include "gc/g1/dirtyCardQueue.hpp"
tschatzl@37414 29 #include "gc/g1/g1CardLiveData.hpp"
pliden@30764 30 #include "gc/g1/g1RemSetSummary.hpp"
tschatzl@35198 31 #include "gc/g1/heapRegion.hpp"
tschatzl@35198 32 #include "memory/allocation.hpp"
tschatzl@35198 33 #include "memory/iterator.hpp"
tschatzl@17854 34
ysr@1374 35 // A G1RemSet provides ways of iterating over pointers into a selected
ysr@1374 36 // collection set.
ysr@1374 37
tschatzl@35198 38 class BitMap;
tschatzl@35198 39 class CardTableModRefBS;
david@35461 40 class G1BlockOffsetTable;
tschatzl@35198 41 class CodeBlobClosure;
ysr@1374 42 class G1CollectedHeap;
kbarrett@38172 43 class G1HotCardCache;
tschatzl@37988 44 class G1RemSetScanState;
tschatzl@46572 45 class G1ParScanThreadState;
mgerdin@37985 46 class G1Policy;
tschatzl@35198 47 class G1SATBCardTableModRefBS;
tschatzl@46572 48 class G1ScanObjsDuringScanRSClosure;
tschatzl@46572 49 class G1ScanObjsDuringUpdateRSClosure;
tschatzl@35198 50 class HeapRegionClaimer;
ysr@1374 51
johnc@6958 52 // A G1RemSet in which each heap region has a rem set that records the
johnc@6958 53 // external heap references into it. Uses a mod ref bs to track updates,
johnc@6958 54 // so that they can be used to update the individual region remsets.
zgu@13195 55 class G1RemSet: public CHeapObj<mtGC> {
tschatzl@17854 56 private:
tschatzl@37988 57 G1RemSetScanState* _scan_state;
tschatzl@37414 58 G1CardLiveData _card_live_data;
tschatzl@37414 59
tschatzl@17854 60 G1RemSetSummary _prev_period_summary;
david@33789 61
david@33789 62 // A DirtyCardQueueSet that is used to hold cards that contain
david@33789 63 // references into the current collection set. This is used to
david@33789 64 // update the remembered sets of the regions in the collection
david@33789 65 // set in the event of an evacuation failure.
david@33789 66 DirtyCardQueueSet _into_cset_dirty_card_queue_set;
david@33789 67
ysr@1374 68 protected:
ysr@1374 69 G1CollectedHeap* _g1;
tschatzl@17854 70 size_t _conc_refine_cards;
jmasa@11396 71 uint n_workers();
ysr@1374 72
ysr@1374 73 protected:
johnc@17108 74 CardTableModRefBS* _ct_bs;
mgerdin@37985 75 G1Policy* _g1p;
kbarrett@38172 76 G1HotCardCache* _hot_card_cache;
ysr@1374 77
ysr@1374 78 public:
tschatzl@35210 79 // Gives an approximation on how many threads can be expected to add records to
tschatzl@35210 80 // a remembered set in parallel. This can be used for sizing data structures to
tschatzl@35210 81 // decrease performance losses due to data structure sharing.
tschatzl@35210 82 // Examples for quantities that influence this value are the maximum number of
tschatzl@35210 83 // mutator threads, maximum number of concurrent refinement or GC threads.
tschatzl@35210 84 static uint num_par_rem_sets();
tschatzl@35210 85
tschatzl@35210 86 // Initialize data that depends on the heap size being known.
tschatzl@37414 87 void initialize(size_t capacity, uint max_regions);
tschatzl@35210 88
ysr@1374 89 // This is called to reset dual hash tables after the gc pause
ysr@1374 90 // is finished and the initial hash table is no longer being
ysr@1374 91 // scanned.
ysr@1374 92 void cleanupHRRS();
ysr@1374 93
kbarrett@38172 94 G1RemSet(G1CollectedHeap* g1,
kbarrett@38172 95 CardTableModRefBS* ct_bs,
kbarrett@38172 96 G1HotCardCache* hot_card_cache);
johnc@6958 97 ~G1RemSet();
ysr@1374 98
tschatzl@46572 99 // Process all oops in the collection set from the cards in the refinement buffers and
tschatzl@46572 100 // remembered sets using pss.
johnc@19339 101 //
tschatzl@46572 102 // Further applies heap_region_codeblobs on the oops of the unmarked nmethods on the strong code
tschatzl@46572 103 // roots list for each region in the collection set.
tschatzl@46572 104 void oops_into_collection_set_do(G1ParScanThreadState* pss,
tschatzl@46571 105 CodeBlobClosure* heap_region_codeblobs,
tschatzl@46571 106 uint worker_i);
ysr@1374 107
johnc@6958 108 // Prepare for and cleanup after an oops_into_collection_set_do
johnc@6958 109 // call. Must call each of these once before and after (in sequential
johnc@6958 110 // code) any threads call oops_into_collection_set_do. (This offers an
johnc@6958 111 // opportunity to sequential setup and teardown of structures needed by a
johnc@6958 112 // parallel iteration over the CS's RS.)
ysr@1374 113 void prepare_for_oops_into_collection_set_do();
ysr@1374 114 void cleanup_after_oops_into_collection_set_do();
johnc@6958 115
tschatzl@46572 116 void scan_rem_set(G1ParScanThreadState* pss,
tschatzl@46571 117 CodeBlobClosure* heap_region_codeblobs,
tschatzl@46571 118 uint worker_i);
johnc@19339 119
tschatzl@37988 120 G1RemSetScanState* scan_state() const { return _scan_state; }
johnc@6958 121
tschatzl@46572 122 // Flush remaining refinement buffers into the remembered set.
tschatzl@46572 123 void update_rem_set(DirtyCardQueue* into_cset_dcq, G1ParScanThreadState* pss, uint worker_i);
ysr@1374 124
ysr@1374 125 // Record, if necessary, the fact that *p (where "p" is in region "from",
ysr@1374 126 // which is required to be non-NULL) has changed to a new non-NULL value.
brutisso@26850 127 template <class T> void par_write_ref(HeapRegion* from, T* p, uint tid);
ysr@1374 128
johnc@6958 129 // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region
johnc@6958 130 // or card, respectively, such that a region or card with a corresponding
johnc@6958 131 // 0 bit contains no part of any live object. Eliminates any remembered
mlarsson@27251 132 // set entries that correspond to dead heap ranges. "worker_num" is the
mlarsson@27251 133 // parallel thread id of the current thread, and "hrclaimer" is the
mlarsson@27251 134 // HeapRegionClaimer that should be used.
tschatzl@37414 135 void scrub(uint worker_num, HeapRegionClaimer* hrclaimer);
ysr@1374 136
johnc@17327 137 // Refine the card corresponding to "card_ptr".
tschatzl@46519 138 void refine_card_concurrently(jbyte* card_ptr,
tschatzl@46519 139 uint worker_i);
tschatzl@46519 140
tschatzl@46519 141 // Refine the card corresponding to "card_ptr". Returns "true" if the given card contains
tschatzl@46519 142 // oops that have references into the current collection set.
tschatzl@46519 143 bool refine_card_during_gc(jbyte* card_ptr,
tschatzl@46572 144 G1ScanObjsDuringUpdateRSClosure* update_rs_cl);
ysr@1374 145
tschatzl@17854 146 // Print accumulated summary info from the start of the VM.
jprovino@46291 147 void print_summary_info();
johnc@6958 148
tschatzl@17854 149 // Print accumulated summary info from the last time called.
jprovino@46291 150 void print_periodic_summary_info(const char* header, uint period_count);
tschatzl@17854 151
johnc@6958 152 // Prepare remembered set for verification.
jprovino@46291 153 void prepare_for_verify();
tschatzl@17854 154
tschatzl@17854 155 size_t conc_refine_cards() const {
tschatzl@17854 156 return _conc_refine_cards;
tschatzl@17854 157 }
tschatzl@37414 158
tschatzl@37414 159 void create_card_live_data(WorkGang* workers, G1CMBitMap* mark_bitmap);
tschatzl@37414 160 void finalize_card_live_data(WorkGang* workers, G1CMBitMap* mark_bitmap);
tschatzl@37414 161
tschatzl@37414 162 // Verify that the liveness count data created concurrently matches one created
tschatzl@37414 163 // during this safepoint.
tschatzl@37414 164 void verify_card_live_data(WorkGang* workers, G1CMBitMap* actual_bitmap);
tschatzl@37414 165
tschatzl@37414 166 void clear_card_live_data(WorkGang* workers);
tschatzl@37414 167
tschatzl@37414 168 #ifdef ASSERT
tschatzl@37414 169 void verify_card_live_data_is_clear();
tschatzl@37414 170 #endif
ysr@1374 171 };
ysr@1374 172
tschatzl@37988 173 class G1ScanRSClosure : public HeapRegionClosure {
tschatzl@37988 174 G1RemSetScanState* _scan_state;
tschatzl@37988 175
tschatzl@46571 176 size_t _cards_scanned;
tschatzl@46571 177 size_t _cards_claimed;
tschatzl@46571 178 size_t _cards_skipped;
tschatzl@46571 179
ehelin@34246 180 G1CollectedHeap* _g1h;
ehelin@34246 181
tschatzl@46572 182 G1ScanObjsDuringScanRSClosure* _scan_objs_on_card_cl;
ehelin@34246 183 CodeBlobClosure* _code_root_cl;
ehelin@34246 184
david@35461 185 G1BlockOffsetTable* _bot;
ehelin@34246 186 G1SATBCardTableModRefBS *_ct_bs;
ehelin@34246 187
ehelin@34246 188 double _strong_code_root_scan_time_sec;
ehelin@34246 189 uint _worker_i;
ehelin@34246 190 size_t _block_size;
ehelin@34246 191
tschatzl@46518 192 void scan_card(size_t index, HeapWord* card_start, HeapRegion *r);
tschatzl@37988 193 void scan_strong_code_roots(HeapRegion* r);
ehelin@34246 194 public:
tschatzl@37988 195 G1ScanRSClosure(G1RemSetScanState* scan_state,
tschatzl@46572 196 G1ScanObjsDuringScanRSClosure* scan_obj_on_card,
tschatzl@37988 197 CodeBlobClosure* code_root_cl,
tschatzl@37988 198 uint worker_i);
ehelin@34246 199
ehelin@34246 200 bool doHeapRegion(HeapRegion* r);
ehelin@34246 201
ehelin@34246 202 double strong_code_root_scan_time_sec() {
ehelin@34246 203 return _strong_code_root_scan_time_sec;
ehelin@34246 204 }
tschatzl@37988 205
tschatzl@46571 206 size_t cards_scanned() const { return _cards_scanned; }
tschatzl@46571 207 size_t cards_claimed() const { return _cards_claimed; }
tschatzl@46571 208 size_t cards_skipped() const { return _cards_skipped; }
ehelin@34246 209 };
ehelin@34246 210
coleenp@13728 211 class UpdateRSOopClosure: public ExtendedOopClosure {
apetrusenko@2152 212 HeapRegion* _from;
johnc@6958 213 G1RemSet* _rs;
vkempik@23855 214 uint _worker_i;
ysr@3262 215
ysr@3262 216 template <class T> void do_oop_work(T* p);
ysr@3262 217
apetrusenko@2152 218 public:
vkempik@23855 219 UpdateRSOopClosure(G1RemSet* rs, uint worker_i = 0) :
johnc@7385 220 _from(NULL), _rs(rs), _worker_i(worker_i)
johnc@7385 221 {}
apetrusenko@2152 222
apetrusenko@2152 223 void set_from(HeapRegion* from) {
apetrusenko@2152 224 assert(from != NULL, "from region must be non-NULL");
apetrusenko@2152 225 _from = from;
apetrusenko@2152 226 }
apetrusenko@2152 227
ysr@3262 228 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
ysr@3262 229 virtual void do_oop(oop* p) { do_oop_work(p); }
apetrusenko@2152 230 };
johnc@6247 231
pliden@30764 232 #endif // SHARE_VM_GC_G1_G1REMSET_HPP