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comparison src/share/vm/gc_implementation/shared/ageTable.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children 58054a18d735
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1997-2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 /* Copyright 1992 Sun Microsystems, Inc. and Stanford University.
26 See the LICENSE file for license information. */
27
28 # include "incls/_precompiled.incl"
29 # include "incls/_ageTable.cpp.incl"
30
31 ageTable::ageTable(bool global) {
32
33 clear();
34
35 if (UsePerfData && global) {
36
37 ResourceMark rm;
38 EXCEPTION_MARK;
39
40 const char* agetable_ns = "generation.0.agetable";
41 const char* bytes_ns = PerfDataManager::name_space(agetable_ns, "bytes");
42
43 for(int age = 0; age < table_size; age ++) {
44 char age_name[10];
45 jio_snprintf(age_name, sizeof(age_name), "%2.2d", age);
46 const char* cname = PerfDataManager::counter_name(bytes_ns, age_name);
47 _perf_sizes[age] = PerfDataManager::create_variable(SUN_GC, cname,
48 PerfData::U_Bytes,
49 CHECK);
50 }
51
52 const char* cname = PerfDataManager::counter_name(agetable_ns, "size");
53 PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None,
54 table_size, CHECK);
55 }
56 }
57
58 void ageTable::clear() {
59 for (size_t* p = sizes; p < sizes + table_size; ++p) {
60 *p = 0;
61 }
62 }
63
64 void ageTable::merge(ageTable* subTable) {
65 for (int i = 0; i < table_size; i++) {
66 sizes[i]+= subTable->sizes[i];
67 }
68 }
69
70 int ageTable::compute_tenuring_threshold(size_t survivor_capacity) {
71 size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100);
72 size_t total = 0;
73 int age = 1;
74 assert(sizes[0] == 0, "no objects with age zero should be recorded");
75 while (age < table_size) {
76 total += sizes[age];
77 // check if including objects of age 'age' made us pass the desired
78 // size, if so 'age' is the new threshold
79 if (total > desired_survivor_size) break;
80 age++;
81 }
82 int result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold;
83
84 if (PrintTenuringDistribution || UsePerfData) {
85
86 if (PrintTenuringDistribution) {
87 gclog_or_tty->cr();
88 gclog_or_tty->print_cr("Desired survivor size %ld bytes, new threshold %d (max %d)",
89 desired_survivor_size*oopSize, result, MaxTenuringThreshold);
90 }
91
92 total = 0;
93 age = 1;
94 while (age < table_size) {
95 total += sizes[age];
96 if (sizes[age] > 0) {
97 if (PrintTenuringDistribution) {
98 gclog_or_tty->print_cr("- age %3d: %10ld bytes, %10ld total",
99 age, sizes[age]*oopSize, total*oopSize);
100 }
101 }
102 if (UsePerfData) {
103 _perf_sizes[age]->set_value(sizes[age]*oopSize);
104 }
105 age++;
106 }
107 if (UsePerfData) {
108 SharedHeap* sh = SharedHeap::heap();
109 CollectorPolicy* policy = sh->collector_policy();
110 GCPolicyCounters* gc_counters = policy->counters();
111 gc_counters->tenuring_threshold()->set_value(result);
112 gc_counters->desired_survivor_size()->set_value(
113 desired_survivor_size*oopSize);
114 }
115 }
116
117 return result;
118 }