Thu, 19 Jun 2014 13:31:14 +0200
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
Reviewed-by: jwilhelm, ehelin, tschatzl
1 /*
2 * Copyright (c) 1997, 2014, 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 */
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"
33 /* Copyright (c) 1992-2009 Oracle and/or its affiliates, and Stanford University.
34 See the LICENSE file for license information. */
36 ageTable::ageTable(bool global) {
38 clear();
40 if (UsePerfData && global) {
42 ResourceMark rm;
43 EXCEPTION_MARK;
45 const char* agetable_ns = "generation.0.agetable";
46 const char* bytes_ns = PerfDataManager::name_space(agetable_ns, "bytes");
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 }
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 }
63 void ageTable::clear() {
64 for (size_t* p = sizes; p < sizes + table_size; ++p) {
65 *p = 0;
66 }
67 }
69 void ageTable::merge(ageTable* subTable) {
70 for (int i = 0; i < table_size; i++) {
71 sizes[i]+= subTable->sizes[i];
72 }
73 }
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 }
81 uint ageTable::compute_tenuring_threshold(size_t survivor_capacity) {
82 size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100);
83 size_t total = 0;
84 uint age = 1;
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 }
93 uint result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold;
95 if (PrintTenuringDistribution || UsePerfData) {
97 if (PrintTenuringDistribution) {
98 gclog_or_tty->cr();
99 gclog_or_tty->print_cr("Desired survivor size " SIZE_FORMAT " bytes, new threshold %u (max %u)",
100 desired_survivor_size*oopSize, result, (int) MaxTenuringThreshold);
101 }
103 total = 0;
104 age = 1;
105 while (age < table_size) {
106 total += sizes[age];
107 if (sizes[age] > 0) {
108 if (PrintTenuringDistribution) {
109 gclog_or_tty->print_cr("- age %3u: " SIZE_FORMAT_W(10) " bytes, " SIZE_FORMAT_W(10) " total",
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 }
128 return result;
129 }