Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/shared/ageTable.cpp @ 10374:87c64c0438fb
6976350: G1: deal with fragmentation while copying objects during GC
Summary: Create G1ParGCAllocBufferContainer to contain two buffers instead of previously using one buffer, in order to hold the first priority buffer longer. Thus, when some large objects hits the value of free space left in the first priority buffer it has an alternative to fit in the second priority buffer while the first priority buffer is given more chances to try allocating smaller objects. Overall, it will improve heap space efficiency.
Reviewed-by: johnc, jmasa, brutisso
Contributed-by: tamao <tao.mao@oracle.com>
| author | tamao |
|---|---|
| date | Mon, 03 Jun 2013 14:37:13 -0700 |
| parents | 203f64878aab |
| children | 78bbf4d43a14 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/shared/ageTable.hpp" | |
| 27 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
| 28 #include "memory/collectorPolicy.hpp" | |
| 29 #include "memory/resourceArea.hpp" | |
| 30 #include "memory/sharedHeap.hpp" | |
| 31 #include "utilities/copy.hpp" | |
| 32 | |
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33 /* Copyright (c) 1992-2009 Oracle and/or its affiliates, and Stanford University. |
| 0 | 34 See the LICENSE file for license information. */ |
| 35 | |
| 36 ageTable::ageTable(bool global) { | |
| 37 | |
| 38 clear(); | |
| 39 | |
| 40 if (UsePerfData && global) { | |
| 41 | |
| 42 ResourceMark rm; | |
| 43 EXCEPTION_MARK; | |
| 44 | |
| 45 const char* agetable_ns = "generation.0.agetable"; | |
| 46 const char* bytes_ns = PerfDataManager::name_space(agetable_ns, "bytes"); | |
| 47 | |
| 48 for(int age = 0; age < table_size; age ++) { | |
| 49 char age_name[10]; | |
| 50 jio_snprintf(age_name, sizeof(age_name), "%2.2d", age); | |
| 51 const char* cname = PerfDataManager::counter_name(bytes_ns, age_name); | |
| 52 _perf_sizes[age] = PerfDataManager::create_variable(SUN_GC, cname, | |
| 53 PerfData::U_Bytes, | |
| 54 CHECK); | |
| 55 } | |
| 56 | |
| 57 const char* cname = PerfDataManager::counter_name(agetable_ns, "size"); | |
| 58 PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None, | |
| 59 table_size, CHECK); | |
| 60 } | |
| 61 } | |
| 62 | |
| 63 void ageTable::clear() { | |
| 64 for (size_t* p = sizes; p < sizes + table_size; ++p) { | |
| 65 *p = 0; | |
| 66 } | |
| 67 } | |
| 68 | |
| 69 void ageTable::merge(ageTable* subTable) { | |
| 70 for (int i = 0; i < table_size; i++) { | |
| 71 sizes[i]+= subTable->sizes[i]; | |
| 72 } | |
| 73 } | |
| 74 | |
| 545 | 75 void ageTable::merge_par(ageTable* subTable) { |
| 76 for (int i = 0; i < table_size; i++) { | |
| 77 Atomic::add_ptr(subTable->sizes[i], &sizes[i]); | |
| 78 } | |
| 79 } | |
| 80 | |
| 6818 | 81 uint ageTable::compute_tenuring_threshold(size_t survivor_capacity) { |
| 0 | 82 size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100); |
| 83 size_t total = 0; | |
| 6818 | 84 uint age = 1; |
| 0 | 85 assert(sizes[0] == 0, "no objects with age zero should be recorded"); |
| 86 while (age < table_size) { | |
| 87 total += sizes[age]; | |
| 88 // check if including objects of age 'age' made us pass the desired | |
| 89 // size, if so 'age' is the new threshold | |
| 90 if (total > desired_survivor_size) break; | |
| 91 age++; | |
| 92 } | |
| 6818 | 93 uint result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold; |
| 0 | 94 |
| 95 if (PrintTenuringDistribution || UsePerfData) { | |
| 96 | |
| 97 if (PrintTenuringDistribution) { | |
| 98 gclog_or_tty->cr(); | |
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7623
203f64878aab
7102489: RFE: cleanup jlong typedef on __APPLE__and _LLP64 systems.
hseigel
parents:
6818
diff
changeset
|
99 gclog_or_tty->print_cr("Desired survivor size " SIZE_FORMAT " bytes, new threshold %u (max %u)", |
| 0 | 100 desired_survivor_size*oopSize, result, MaxTenuringThreshold); |
| 101 } | |
| 102 | |
| 103 total = 0; | |
| 104 age = 1; | |
| 105 while (age < table_size) { | |
| 106 total += sizes[age]; | |
| 107 if (sizes[age] > 0) { | |
| 108 if (PrintTenuringDistribution) { | |
| 6818 | 109 gclog_or_tty->print_cr("- age %3u: %10ld bytes, %10ld total", |
| 0 | 110 age, sizes[age]*oopSize, total*oopSize); |
| 111 } | |
| 112 } | |
| 113 if (UsePerfData) { | |
| 114 _perf_sizes[age]->set_value(sizes[age]*oopSize); | |
| 115 } | |
| 116 age++; | |
| 117 } | |
| 118 if (UsePerfData) { | |
| 119 SharedHeap* sh = SharedHeap::heap(); | |
| 120 CollectorPolicy* policy = sh->collector_policy(); | |
| 121 GCPolicyCounters* gc_counters = policy->counters(); | |
| 122 gc_counters->tenuring_threshold()->set_value(result); | |
| 123 gc_counters->desired_survivor_size()->set_value( | |
| 124 desired_survivor_size*oopSize); | |
| 125 } | |
| 126 } | |
| 127 | |
| 128 return result; | |
| 129 } |