1 /* 2 * Copyright (c) 1997, 2016, 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 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 * 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 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "gc/shared/ageTable.inline.hpp" 27 #include "gc/shared/ageTableTracer.hpp" 28 #include "gc/shared/collectedHeap.hpp" 29 #include "gc/shared/collectorPolicy.hpp" 30 #include "gc/shared/gcPolicyCounters.hpp" 31 #include "memory/resourceArea.hpp" 32 #include "logging/log.hpp" 33 #include "oops/oop.inline.hpp" 34 #include "utilities/copy.hpp" 35 36 /* Copyright (c) 1992, 2016, Oracle and/or its affiliates, and Stanford University. 37 See the LICENSE file for license information. */ 38 39 AgeTable::AgeTable(bool global) { 40 41 clear(); 42 43 if (UsePerfData && global) { 44 45 ResourceMark rm; 46 EXCEPTION_MARK; 47 48 const char* agetable_ns = "generation.0.agetable"; 49 const char* bytes_ns = PerfDataManager::name_space(agetable_ns, "bytes"); 50 51 for(int age = 0; age < table_size; age ++) { 52 char age_name[10]; 53 jio_snprintf(age_name, sizeof(age_name), "%2.2d", age); 54 const char* cname = PerfDataManager::counter_name(bytes_ns, age_name); 55 _perf_sizes[age] = PerfDataManager::create_variable(SUN_GC, cname, 56 PerfData::U_Bytes, 57 CHECK); 58 } 59 60 const char* cname = PerfDataManager::counter_name(agetable_ns, "size"); 61 PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None, 62 table_size, CHECK); 63 } 64 } 65 66 void AgeTable::clear() { 67 for (size_t* p = sizes; p < sizes + table_size; ++p) { 68 *p = 0; 69 } 70 } 71 72 void AgeTable::merge(AgeTable* subTable) { 73 for (int i = 0; i < table_size; i++) { 74 sizes[i]+= subTable->sizes[i]; 75 } 76 } 77 78 uint AgeTable::compute_tenuring_threshold(size_t desired_survivor_size) { 79 uint result; 80 81 if (AlwaysTenure || NeverTenure) { 82 assert(MaxTenuringThreshold == 0 || MaxTenuringThreshold == markOopDesc::max_age + 1, 83 "MaxTenuringThreshold should be 0 or markOopDesc::max_age + 1, but is " UINTX_FORMAT, MaxTenuringThreshold); 84 result = MaxTenuringThreshold; 85 } else { 86 size_t total = 0; 87 uint age = 1; 88 assert(sizes[0] == 0, "no objects with age zero should be recorded"); 89 while (age < table_size) { 90 total += sizes[age]; 91 // check if including objects of age 'age' made us pass the desired 92 // size, if so 'age' is the new threshold 93 if (total > desired_survivor_size) break; 94 age++; 95 } 96 result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold; 97 } 98 99 100 log_debug(gc, age)("Desired survivor size " SIZE_FORMAT " bytes, new threshold " UINTX_FORMAT " (max threshold " UINTX_FORMAT ")", 101 desired_survivor_size * oopSize, (uintx) result, MaxTenuringThreshold); 102 103 return result; 104 } 105 106 void AgeTable::print_age_table(uint tenuring_threshold) { 107 if (log_is_enabled(Trace, gc, age) || UsePerfData || AgeTableTracer::is_tenuring_distribution_event_enabled()) { 108 log_trace(gc, age)("Age table with threshold %u (max threshold " UINTX_FORMAT ")", 109 tenuring_threshold, MaxTenuringThreshold); 110 111 size_t total = 0; 112 uint age = 1; 113 while (age < table_size) { 114 size_t wordSize = sizes[age]; 115 total += wordSize; 116 if (wordSize > 0) { 117 log_trace(gc, age)("- age %3u: " SIZE_FORMAT_W(10) " bytes, " SIZE_FORMAT_W(10) " total", 118 age, wordSize * oopSize, total * oopSize); 119 } 120 AgeTableTracer::send_tenuring_distribution_event(age, wordSize * oopSize); 121 if (UsePerfData) { 122 _perf_sizes[age]->set_value(wordSize * oopSize); 123 } 124 age++; 125 } 126 } 127 }