1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/g1/g1MonitoringSupport.cpp Thu Apr 21 10:23:44 2011 -0700
1.3 @@ -0,0 +1,178 @@
1.4 +/*
1.5 + * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "gc_implementation/g1/g1MonitoringSupport.hpp"
1.30 +#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
1.31 +#include "gc_implementation/g1/g1CollectorPolicy.hpp"
1.32 +
1.33 +G1MonitoringSupport::G1MonitoringSupport(G1CollectedHeap* g1h,
1.34 + VirtualSpace* g1_storage_addr) :
1.35 + _g1h(g1h),
1.36 + _incremental_collection_counters(NULL),
1.37 + _full_collection_counters(NULL),
1.38 + _non_young_collection_counters(NULL),
1.39 + _old_space_counters(NULL),
1.40 + _young_collection_counters(NULL),
1.41 + _eden_counters(NULL),
1.42 + _from_counters(NULL),
1.43 + _to_counters(NULL),
1.44 + _g1_storage_addr(g1_storage_addr)
1.45 +{
1.46 + // Counters for GC collections
1.47 + //
1.48 + // name "collector.0". In a generational collector this would be the
1.49 + // young generation collection.
1.50 + _incremental_collection_counters =
1.51 + new CollectorCounters("G1 incremental collections", 0);
1.52 + // name "collector.1". In a generational collector this would be the
1.53 + // old generation collection.
1.54 + _full_collection_counters =
1.55 + new CollectorCounters("G1 stop-the-world full collections", 1);
1.56 +
1.57 + // timer sampling for all counters supporting sampling only update the
1.58 + // used value. See the take_sample() method. G1 requires both used and
1.59 + // capacity updated so sampling is not currently used. It might
1.60 + // be sufficient to update all counters in take_sample() even though
1.61 + // take_sample() only returns "used". When sampling was used, there
1.62 + // were some anomolous values emitted which may have been the consequence
1.63 + // of not updating all values simultaneously (i.e., see the calculation done
1.64 + // in eden_space_used(), is it possbile that the values used to
1.65 + // calculate either eden_used or survivor_used are being updated by
1.66 + // the collector when the sample is being done?).
1.67 + const bool sampled = false;
1.68 +
1.69 + // "Generation" and "Space" counters.
1.70 + //
1.71 + // name "generation.1" This is logically the old generation in
1.72 + // generational GC terms. The "1, 1" parameters are for
1.73 + // the n-th generation (=1) with 1 space.
1.74 + // Counters are created from minCapacity, maxCapacity, and capacity
1.75 + _non_young_collection_counters =
1.76 + new GenerationCounters("whole heap", 1, 1, _g1_storage_addr);
1.77 +
1.78 + // name "generation.1.space.0"
1.79 + // Counters are created from maxCapacity, capacity, initCapacity,
1.80 + // and used.
1.81 + _old_space_counters = new HSpaceCounters("space", 0,
1.82 + _g1h->max_capacity(), _g1h->capacity(), _non_young_collection_counters);
1.83 +
1.84 + // Young collection set
1.85 + // name "generation.0". This is logically the young generation.
1.86 + // The "0, 3" are paremeters for the n-th genertaion (=0) with 3 spaces.
1.87 + // See _non_young_collection_counters for additional counters
1.88 + _young_collection_counters = new GenerationCounters("young", 0, 3, NULL);
1.89 +
1.90 + // Replace "max_heap_byte_size() with maximum young gen size for
1.91 + // g1Collectedheap
1.92 + // name "generation.0.space.0"
1.93 + // See _old_space_counters for additional counters
1.94 + _eden_counters = new HSpaceCounters("eden", 0,
1.95 + _g1h->max_capacity(), eden_space_committed(),
1.96 + _young_collection_counters);
1.97 +
1.98 + // name "generation.0.space.1"
1.99 + // See _old_space_counters for additional counters
1.100 + // Set the arguments to indicate that this survivor space is not used.
1.101 + _from_counters = new HSpaceCounters("s0", 1, (long) 0, (long) 0,
1.102 + _young_collection_counters);
1.103 +
1.104 + // name "generation.0.space.2"
1.105 + // See _old_space_counters for additional counters
1.106 + _to_counters = new HSpaceCounters("s1", 2,
1.107 + _g1h->max_capacity(),
1.108 + survivor_space_committed(),
1.109 + _young_collection_counters);
1.110 +}
1.111 +
1.112 +size_t G1MonitoringSupport::overall_committed() {
1.113 + return g1h()->capacity();
1.114 +}
1.115 +
1.116 +size_t G1MonitoringSupport::overall_used() {
1.117 + return g1h()->used_unlocked();
1.118 +}
1.119 +
1.120 +size_t G1MonitoringSupport::eden_space_committed() {
1.121 + return MAX2(eden_space_used(), (size_t) HeapRegion::GrainBytes);
1.122 +}
1.123 +
1.124 +size_t G1MonitoringSupport::eden_space_used() {
1.125 + size_t young_list_length = g1h()->young_list()->length();
1.126 + size_t eden_used = young_list_length * HeapRegion::GrainBytes;
1.127 + size_t survivor_used = survivor_space_used();
1.128 + eden_used = subtract_up_to_zero(eden_used, survivor_used);
1.129 + return eden_used;
1.130 +}
1.131 +
1.132 +size_t G1MonitoringSupport::survivor_space_committed() {
1.133 + return MAX2(survivor_space_used(),
1.134 + (size_t) HeapRegion::GrainBytes);
1.135 +}
1.136 +
1.137 +size_t G1MonitoringSupport::survivor_space_used() {
1.138 + size_t survivor_num = g1h()->g1_policy()->recorded_survivor_regions();
1.139 + size_t survivor_used = survivor_num * HeapRegion::GrainBytes;
1.140 + return survivor_used;
1.141 +}
1.142 +
1.143 +size_t G1MonitoringSupport::old_space_committed() {
1.144 + size_t committed = overall_committed();
1.145 + size_t eden_committed = eden_space_committed();
1.146 + size_t survivor_committed = survivor_space_committed();
1.147 + committed = subtract_up_to_zero(committed, eden_committed);
1.148 + committed = subtract_up_to_zero(committed, survivor_committed);
1.149 + committed = MAX2(committed, (size_t) HeapRegion::GrainBytes);
1.150 + return committed;
1.151 +}
1.152 +
1.153 +// See the comment near the top of g1MonitoringSupport.hpp for
1.154 +// an explanation of these calculations for "used" and "capacity".
1.155 +size_t G1MonitoringSupport::old_space_used() {
1.156 + size_t used = overall_used();
1.157 + size_t eden_used = eden_space_used();
1.158 + size_t survivor_used = survivor_space_used();
1.159 + used = subtract_up_to_zero(used, eden_used);
1.160 + used = subtract_up_to_zero(used, survivor_used);
1.161 + return used;
1.162 +}
1.163 +
1.164 +void G1MonitoringSupport::update_counters() {
1.165 + if (UsePerfData) {
1.166 + eden_counters()->update_capacity(eden_space_committed());
1.167 + eden_counters()->update_used(eden_space_used());
1.168 + to_counters()->update_capacity(survivor_space_committed());
1.169 + to_counters()->update_used(survivor_space_used());
1.170 + old_space_counters()->update_capacity(old_space_committed());
1.171 + old_space_counters()->update_used(old_space_used());
1.172 + non_young_collection_counters()->update_all();
1.173 + }
1.174 +}
1.175 +
1.176 +void G1MonitoringSupport::update_eden_counters() {
1.177 + if (UsePerfData) {
1.178 + eden_counters()->update_capacity(eden_space_committed());
1.179 + eden_counters()->update_used(eden_space_used());
1.180 + }
1.181 +}
