truffle: src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp annotate

annotate src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp @ 993:54b3b351d6f9

Merge

author	jrose
date	Wed, 23 Sep 2009 23:56:15 -0700
parents	6cb8e9df7174
children	035d2e036a9b

rev	line source
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	1 /*
844 bd02caa94611 6862919: Update copyright year xdono parents: 799 diff changeset	2 * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved.
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	4 *
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	7 * published by the Free Software Foundation.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	8 *
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	13 * accompanied this code).
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	14 *
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	18 *
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	20 * CA 95054 USA or visit www.sun.com if you need additional information or
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	21 * have any questions.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	22 *
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	23 */
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	24
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	25 #include "incls/_precompiled.incl"
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	26 #include "incls/_concurrentG1Refine.cpp.incl"
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	27
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	28 // Possible sizes for the card counts cache: odd primes that roughly double in size.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	29 // (See jvmtiTagMap.cpp).
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	30 int ConcurrentG1Refine::_cc_cache_sizes[] = {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	31 16381, 32771, 76831, 150001, 307261,
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	32 614563, 1228891, 2457733, 4915219, 9830479,
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	33 19660831, 39321619, 78643219, 157286461, -1
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	34 };
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	35
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	36 ConcurrentG1Refine::ConcurrentG1Refine() :
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	37 _card_counts(NULL), _card_epochs(NULL),
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	38 _n_card_counts(0), _max_n_card_counts(0),
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	39 _cache_size_index(0), _expand_card_counts(false),
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	40 _hot_cache(NULL),
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	41 _def_use_cache(false), _use_cache(false),
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	42 _n_periods(0),
794 315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	43 _threads(NULL), _n_threads(0)
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	44 {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	45 if (G1ConcRefine) {
795 215f81b4d9b3 6841831: G1: assert(contains_reference(from),"We just added it!") fires iveresov parents: 794 diff changeset	46 _n_threads = (int)thread_num();
794 315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	47 if (_n_threads > 0) {
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	48 _threads = NEW_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _n_threads);
795 215f81b4d9b3 6841831: G1: assert(contains_reference(from),"We just added it!") fires iveresov parents: 794 diff changeset	49 int worker_id_offset = (int)DirtyCardQueueSet::num_par_ids();
794 315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	50 ConcurrentG1RefineThread *next = NULL;
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	51 for (int i = _n_threads - 1; i >= 0; i--) {
795 215f81b4d9b3 6841831: G1: assert(contains_reference(from),"We just added it!") fires iveresov parents: 794 diff changeset	52 ConcurrentG1RefineThread* t = new ConcurrentG1RefineThread(this, next, worker_id_offset, i);
794 315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	53 assert(t != NULL, "Conc refine should have been created");
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	54 assert(t->cg1r() == this, "Conc refine thread should refer to this");
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	55 _threads[i] = t;
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	56 next = t;
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	57 }
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	58 }
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	59 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	60 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	61
795 215f81b4d9b3 6841831: G1: assert(contains_reference(from),"We just added it!") fires iveresov parents: 794 diff changeset	62 size_t ConcurrentG1Refine::thread_num() {
215f81b4d9b3 6841831: G1: assert(contains_reference(from),"We just added it!") fires iveresov parents: 794 diff changeset	63 if (G1ConcRefine) {
215f81b4d9b3 6841831: G1: assert(contains_reference(from),"We just added it!") fires iveresov parents: 794 diff changeset	64 return (G1ParallelRSetThreads > 0) ? G1ParallelRSetThreads : ParallelGCThreads;
215f81b4d9b3 6841831: G1: assert(contains_reference(from),"We just added it!") fires iveresov parents: 794 diff changeset	65 }
215f81b4d9b3 6841831: G1: assert(contains_reference(from),"We just added it!") fires iveresov parents: 794 diff changeset	66 return 0;
215f81b4d9b3 6841831: G1: assert(contains_reference(from),"We just added it!") fires iveresov parents: 794 diff changeset	67 }
215f81b4d9b3 6841831: G1: assert(contains_reference(from),"We just added it!") fires iveresov parents: 794 diff changeset	68
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	69 void ConcurrentG1Refine::init() {
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	70 if (G1ConcRSLogCacheSize > 0) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	71 _g1h = G1CollectedHeap::heap();
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	72 _max_n_card_counts =
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	73 (unsigned) (_g1h->g1_reserved_obj_bytes() >> CardTableModRefBS::card_shift);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	74
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	75 size_t max_card_num = ((size_t)1 << (sizeof(unsigned)*BitsPerByte-1)) - 1;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	76 guarantee(_max_n_card_counts < max_card_num, "card_num representation");
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	77
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	78 int desired = _max_n_card_counts / InitialCacheFraction;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	79 for (_cache_size_index = 0;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	80 _cc_cache_sizes[_cache_size_index] >= 0; _cache_size_index++) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	81 if (_cc_cache_sizes[_cache_size_index] >= desired) break;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	82 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	83 _cache_size_index = MAX2(0, (_cache_size_index - 1));
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	84
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	85 int initial_size = _cc_cache_sizes[_cache_size_index];
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	86 if (initial_size < 0) initial_size = _max_n_card_counts;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	87
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	88 // Make sure we don't go bigger than we will ever need
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	89 _n_card_counts = MIN2((unsigned) initial_size, _max_n_card_counts);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	90
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	91 _card_counts = NEW_C_HEAP_ARRAY(CardCountCacheEntry, _n_card_counts);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	92 _card_epochs = NEW_C_HEAP_ARRAY(CardEpochCacheEntry, _n_card_counts);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	93
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	94 Copy::fill_to_bytes(&_card_counts[0],
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	95 _n_card_counts * sizeof(CardCountCacheEntry));
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	96 Copy::fill_to_bytes(&_card_epochs[0], _n_card_counts * sizeof(CardEpochCacheEntry));
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	97
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	98 ModRefBarrierSet* bs = _g1h->mr_bs();
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	99 guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition");
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	100 _ct_bs = (CardTableModRefBS*)bs;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	101 _ct_bot = _ct_bs->byte_for_const(_g1h->reserved_region().start());
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	102
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	103 _def_use_cache = true;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	104 _use_cache = true;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	105 _hot_cache_size = (1 << G1ConcRSLogCacheSize);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	106 _hot_cache = NEW_C_HEAP_ARRAY(jbyte*, _hot_cache_size);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	107 _n_hot = 0;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	108 _hot_cache_idx = 0;
889 15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	109
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	110 // For refining the cards in the hot cache in parallel
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	111 int n_workers = (ParallelGCThreads > 0 ?
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	112 _g1h->workers()->total_workers() : 1);
889 15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	113 _hot_cache_par_chunk_size = MAX2(1, _hot_cache_size / n_workers);
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	114 _hot_cache_par_claimed_idx = 0;
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	115 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	116 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	117
794 315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	118 void ConcurrentG1Refine::stop() {
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	119 if (_threads != NULL) {
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	120 for (int i = 0; i < _n_threads; i++) {
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	121 _threads[i]->stop();
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	122 }
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	123 }
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	124 }
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	125
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	126 ConcurrentG1Refine::~ConcurrentG1Refine() {
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	127 if (G1ConcRSLogCacheSize > 0) {
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	128 assert(_card_counts != NULL, "Logic");
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	129 FREE_C_HEAP_ARRAY(CardCountCacheEntry, _card_counts);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	130 assert(_card_epochs != NULL, "Logic");
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	131 FREE_C_HEAP_ARRAY(CardEpochCacheEntry, _card_epochs);
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	132 assert(_hot_cache != NULL, "Logic");
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	133 FREE_C_HEAP_ARRAY(jbyte*, _hot_cache);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	134 }
794 315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	135 if (_threads != NULL) {
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	136 for (int i = 0; i < _n_threads; i++) {
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	137 delete _threads[i];
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	138 }
799 f89cf529c3c7 6849122: G1: Typo introduced during implementation of the parallel refinement iveresov parents: 795 diff changeset	139 FREE_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _threads);
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	140 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	141 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	142
794 315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	143 void ConcurrentG1Refine::threads_do(ThreadClosure *tc) {
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	144 if (_threads != NULL) {
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	145 for (int i = 0; i < _n_threads; i++) {
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	146 tc->do_thread(_threads[i]);
315a5d70b295 6484957: G1: parallel concurrent refinement iveresov parents: 637 diff changeset	147 }
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	148 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	149 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	150
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	151 bool ConcurrentG1Refine::is_young_card(jbyte* card_ptr) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	152 HeapWord* start = _ct_bs->addr_for(card_ptr);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	153 HeapRegion* r = _g1h->heap_region_containing(start);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	154 if (r != NULL && r->is_young()) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	155 return true;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	156 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	157 // This card is not associated with a heap region
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	158 // so can't be young.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	159 return false;
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	160 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	161
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	162 jbyte* ConcurrentG1Refine::add_card_count(jbyte* card_ptr, int* count, bool* defer) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	163 unsigned new_card_num = ptr_2_card_num(card_ptr);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	164 unsigned bucket = hash(new_card_num);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	165 assert(0 <= bucket && bucket < _n_card_counts, "Bounds");
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	166
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	167 CardCountCacheEntry* count_ptr = &_card_counts[bucket];
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	168 CardEpochCacheEntry* epoch_ptr = &_card_epochs[bucket];
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	169
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	170 // We have to construct a new entry if we haven't updated the counts
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	171 // during the current period, or if the count was updated for a
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	172 // different card number.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	173 unsigned int new_epoch = (unsigned int) _n_periods;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	174 julong new_epoch_entry = make_epoch_entry(new_card_num, new_epoch);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	175
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	176 while (true) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	177 // Fetch the previous epoch value
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	178 julong prev_epoch_entry = epoch_ptr->_value;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	179 julong cas_res;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	180
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	181 if (extract_epoch(prev_epoch_entry) != new_epoch) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	182 // This entry has not yet been updated during this period.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	183 // Note: we update the epoch value atomically to ensure
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	184 // that there is only one winner that updates the cached
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	185 // card_ptr value even though all the refine threads share
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	186 // the same epoch value.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	187
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	188 cas_res = (julong) Atomic::cmpxchg((jlong) new_epoch_entry,
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	189 (volatile jlong*)&epoch_ptr->_value,
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	190 (jlong) prev_epoch_entry);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	191
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	192 if (cas_res == prev_epoch_entry) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	193 // We have successfully won the race to update the
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	194 // epoch and card_num value. Make it look like the
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	195 // count and eviction count were previously cleared.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	196 count_ptr->_count = 1;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	197 count_ptr->_evict_count = 0;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	198 *count = 0;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	199 // We can defer the processing of card_ptr
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	200 *defer = true;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	201 return card_ptr;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	202 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	203 // We did not win the race to update the epoch field, so some other
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	204 // thread must have done it. The value that gets returned by CAS
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	205 // should be the new epoch value.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	206 assert(extract_epoch(cas_res) == new_epoch, "unexpected epoch");
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	207 // We could 'continue' here or just re-read the previous epoch value
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	208 prev_epoch_entry = epoch_ptr->_value;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	209 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	210
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	211 // The epoch entry for card_ptr has been updated during this period.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	212 unsigned old_card_num = extract_card_num(prev_epoch_entry);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	213
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	214 // The card count that will be returned to caller
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	215 *count = count_ptr->_count;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	216
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	217 // Are we updating the count for the same card?
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	218 if (new_card_num == old_card_num) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	219 // Same card - just update the count. We could have more than one
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	220 // thread racing to update count for the current card. It should be
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	221 // OK not to use a CAS as the only penalty should be some missed
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	222 // increments of the count which delays identifying the card as "hot".
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	223
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	224 if (*count < max_jubyte) count_ptr->_count++;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	225 // We can defer the processing of card_ptr
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	226 *defer = true;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	227 return card_ptr;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	228 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	229
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	230 // Different card - evict old card info
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	231 if (count_ptr->_evict_count < max_jubyte) count_ptr->_evict_count++;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	232 if (count_ptr->_evict_count > G1CardCountCacheExpandThreshold) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	233 // Trigger a resize the next time we clear
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	234 _expand_card_counts = true;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	235 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	236
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	237 cas_res = (julong) Atomic::cmpxchg((jlong) new_epoch_entry,
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	238 (volatile jlong*)&epoch_ptr->_value,
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	239 (jlong) prev_epoch_entry);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	240
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	241 if (cas_res == prev_epoch_entry) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	242 // We successfully updated the card num value in the epoch entry
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	243 count_ptr->_count = 0; // initialize counter for new card num
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	244
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	245 // Even though the region containg the card at old_card_num was not
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	246 // in the young list when old_card_num was recorded in the epoch
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	247 // cache it could have been added to the free list and subsequently
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	248 // added to the young list in the intervening time. If the evicted
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	249 // card is in a young region just return the card_ptr and the evicted
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	250 // card will not be cleaned. See CR 6817995.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	251
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	252 jbyte* old_card_ptr = card_num_2_ptr(old_card_num);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	253 if (is_young_card(old_card_ptr)) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	254 *count = 0;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	255 // We can defer the processing of card_ptr
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	256 *defer = true;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	257 return card_ptr;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	258 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	259
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	260 // We do not want to defer processing of card_ptr in this case
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	261 // (we need to refine old_card_ptr and card_ptr)
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	262 *defer = false;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	263 return old_card_ptr;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	264 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	265 // Someone else beat us - try again.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	266 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	267 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	268
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	269 jbyte* ConcurrentG1Refine::cache_insert(jbyte* card_ptr, bool* defer) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	270 int count;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	271 jbyte* cached_ptr = add_card_count(card_ptr, &count, defer);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	272 assert(cached_ptr != NULL, "bad cached card ptr");
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	273 assert(!is_young_card(cached_ptr), "shouldn't get a card in young region");
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	274
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	275 // The card pointer we obtained from card count cache is not hot
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	276 // so do not store it in the cache; return it for immediate
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	277 // refining.
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	278 if (count < G1ConcRSHotCardLimit) {
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	279 return cached_ptr;
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	280 }
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	281
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	282 // Otherwise, the pointer we got from the _card_counts is hot.
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	283 jbyte* res = NULL;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	284 MutexLockerEx x(HotCardCache_lock, Mutex::_no_safepoint_check_flag);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	285 if (_n_hot == _hot_cache_size) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	286 res = _hot_cache[_hot_cache_idx];
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	287 _n_hot--;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	288 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	289 // Now _n_hot < _hot_cache_size, and we can insert at _hot_cache_idx.
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	290 _hot_cache[_hot_cache_idx] = cached_ptr;
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	291 _hot_cache_idx++;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	292 if (_hot_cache_idx == _hot_cache_size) _hot_cache_idx = 0;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	293 _n_hot++;
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	294
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	295 if (res != NULL) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	296 // Even though the region containg res was not in the young list
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	297 // when it was recorded in the hot cache it could have been added
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	298 // to the free list and subsequently added to the young list in
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	299 // the intervening time. If res is in a young region, return NULL
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	300 // so that res is not cleaned. See CR 6817995.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	301
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	302 if (is_young_card(res)) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	303 res = NULL;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	304 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	305 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	306
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	307 return res;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	308 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	309
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	310 void ConcurrentG1Refine::clean_up_cache(int worker_i, G1RemSet* g1rs) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	311 assert(!use_cache(), "cache should be disabled");
889 15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	312 int start_idx;
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	313
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	314 while ((start_idx = _hot_cache_par_claimed_idx) < _n_hot) { // read once
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	315 int end_idx = start_idx + _hot_cache_par_chunk_size;
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	316
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	317 if (start_idx ==
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	318 Atomic::cmpxchg(end_idx, &_hot_cache_par_claimed_idx, start_idx)) {
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	319 // The current worker has successfully claimed the chunk [start_idx..end_idx)
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	320 end_idx = MIN2(end_idx, _n_hot);
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	321 for (int i = start_idx; i < end_idx; i++) {
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	322 jbyte* entry = _hot_cache[i];
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	323 if (entry != NULL) {
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	324 g1rs->concurrentRefineOneCard(entry, worker_i);
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	325 }
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup johnc parents: 844 diff changeset	326 }
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	327 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	328 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	329 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	330
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	331 void ConcurrentG1Refine::expand_card_count_cache() {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	332 if (_n_card_counts < _max_n_card_counts) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	333 int new_idx = _cache_size_index+1;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	334 int new_size = _cc_cache_sizes[new_idx];
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	335 if (new_size < 0) new_size = _max_n_card_counts;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	336
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	337 // Make sure we don't go bigger than we will ever need
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	338 new_size = MIN2((unsigned) new_size, _max_n_card_counts);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	339
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	340 // Expand the card count and card epoch tables
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	341 if (new_size > (int)_n_card_counts) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	342 // We can just free and allocate a new array as we're
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	343 // not interested in preserving the contents
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	344 assert(_card_counts != NULL, "Logic!");
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	345 assert(_card_epochs != NULL, "Logic!");
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	346 FREE_C_HEAP_ARRAY(CardCountCacheEntry, _card_counts);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	347 FREE_C_HEAP_ARRAY(CardEpochCacheEntry, _card_epochs);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	348 _n_card_counts = new_size;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	349 _card_counts = NEW_C_HEAP_ARRAY(CardCountCacheEntry, _n_card_counts);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	350 _card_epochs = NEW_C_HEAP_ARRAY(CardEpochCacheEntry, _n_card_counts);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	351 _cache_size_index = new_idx;
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	352 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	353 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	354 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	355
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	356 void ConcurrentG1Refine::clear_and_record_card_counts() {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	357 if (G1ConcRSLogCacheSize == 0) return;
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	358
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	359 #ifndef PRODUCT
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	360 double start = os::elapsedTime();
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	361 #endif
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	362
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	363 if (_expand_card_counts) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	364 expand_card_count_cache();
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	365 _expand_card_counts = false;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	366 // Only need to clear the epochs.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	367 Copy::fill_to_bytes(&_card_epochs[0], _n_card_counts * sizeof(CardEpochCacheEntry));
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	368 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	369
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	370 int this_epoch = (int) _n_periods;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	371 assert((this_epoch+1) <= max_jint, "to many periods");
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	372 // Update epoch
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	373 _n_periods++;
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	374
890 6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	375 #ifndef PRODUCT
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	376 double elapsed = os::elapsedTime() - start;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	377 _g1h->g1_policy()->record_cc_clear_time(elapsed * 1000.0);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC. johnc parents: 889 diff changeset	378 #endif
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	379 }

Mercurial > hg > truffle

annotate src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp @ 993:54b3b351d6f9