1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/g1/g1MonitoringSupport.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,274 @@
1.4 +/*
1.5 + * Copyright (c) 2011, 2013, 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 +G1GenerationCounters::G1GenerationCounters(G1MonitoringSupport* g1mm,
1.34 + const char* name,
1.35 + int ordinal, int spaces,
1.36 + size_t min_capacity,
1.37 + size_t max_capacity,
1.38 + size_t curr_capacity)
1.39 + : GenerationCounters(name, ordinal, spaces, min_capacity,
1.40 + max_capacity, curr_capacity), _g1mm(g1mm) { }
1.41 +
1.42 +// We pad the capacity three times given that the young generation
1.43 +// contains three spaces (eden and two survivors).
1.44 +G1YoungGenerationCounters::G1YoungGenerationCounters(G1MonitoringSupport* g1mm,
1.45 + const char* name)
1.46 + : G1GenerationCounters(g1mm, name, 0 /* ordinal */, 3 /* spaces */,
1.47 + G1MonitoringSupport::pad_capacity(0, 3) /* min_capacity */,
1.48 + G1MonitoringSupport::pad_capacity(g1mm->young_gen_max(), 3),
1.49 + G1MonitoringSupport::pad_capacity(0, 3) /* curr_capacity */) {
1.50 + if (UsePerfData) {
1.51 + update_all();
1.52 + }
1.53 +}
1.54 +
1.55 +G1OldGenerationCounters::G1OldGenerationCounters(G1MonitoringSupport* g1mm,
1.56 + const char* name)
1.57 + : G1GenerationCounters(g1mm, name, 1 /* ordinal */, 1 /* spaces */,
1.58 + G1MonitoringSupport::pad_capacity(0) /* min_capacity */,
1.59 + G1MonitoringSupport::pad_capacity(g1mm->old_gen_max()),
1.60 + G1MonitoringSupport::pad_capacity(0) /* curr_capacity */) {
1.61 + if (UsePerfData) {
1.62 + update_all();
1.63 + }
1.64 +}
1.65 +
1.66 +void G1YoungGenerationCounters::update_all() {
1.67 + size_t committed =
1.68 + G1MonitoringSupport::pad_capacity(_g1mm->young_gen_committed(), 3);
1.69 + _current_size->set_value(committed);
1.70 +}
1.71 +
1.72 +void G1OldGenerationCounters::update_all() {
1.73 + size_t committed =
1.74 + G1MonitoringSupport::pad_capacity(_g1mm->old_gen_committed());
1.75 + _current_size->set_value(committed);
1.76 +}
1.77 +
1.78 +G1MonitoringSupport::G1MonitoringSupport(G1CollectedHeap* g1h) :
1.79 + _g1h(g1h),
1.80 + _incremental_collection_counters(NULL),
1.81 + _full_collection_counters(NULL),
1.82 + _old_collection_counters(NULL),
1.83 + _old_space_counters(NULL),
1.84 + _young_collection_counters(NULL),
1.85 + _eden_counters(NULL),
1.86 + _from_counters(NULL),
1.87 + _to_counters(NULL),
1.88 +
1.89 + _overall_reserved(0),
1.90 + _overall_committed(0), _overall_used(0),
1.91 + _young_region_num(0),
1.92 + _young_gen_committed(0),
1.93 + _eden_committed(0), _eden_used(0),
1.94 + _survivor_committed(0), _survivor_used(0),
1.95 + _old_committed(0), _old_used(0) {
1.96 +
1.97 + _overall_reserved = g1h->max_capacity();
1.98 + recalculate_sizes();
1.99 +
1.100 + // Counters for GC collections
1.101 + //
1.102 + // name "collector.0". In a generational collector this would be the
1.103 + // young generation collection.
1.104 + _incremental_collection_counters =
1.105 + new CollectorCounters("G1 incremental collections", 0);
1.106 + // name "collector.1". In a generational collector this would be the
1.107 + // old generation collection.
1.108 + _full_collection_counters =
1.109 + new CollectorCounters("G1 stop-the-world full collections", 1);
1.110 +
1.111 + // timer sampling for all counters supporting sampling only update the
1.112 + // used value. See the take_sample() method. G1 requires both used and
1.113 + // capacity updated so sampling is not currently used. It might
1.114 + // be sufficient to update all counters in take_sample() even though
1.115 + // take_sample() only returns "used". When sampling was used, there
1.116 + // were some anomolous values emitted which may have been the consequence
1.117 + // of not updating all values simultaneously (i.e., see the calculation done
1.118 + // in eden_space_used(), is it possbile that the values used to
1.119 + // calculate either eden_used or survivor_used are being updated by
1.120 + // the collector when the sample is being done?).
1.121 + const bool sampled = false;
1.122 +
1.123 + // "Generation" and "Space" counters.
1.124 + //
1.125 + // name "generation.1" This is logically the old generation in
1.126 + // generational GC terms. The "1, 1" parameters are for
1.127 + // the n-th generation (=1) with 1 space.
1.128 + // Counters are created from minCapacity, maxCapacity, and capacity
1.129 + _old_collection_counters = new G1OldGenerationCounters(this, "old");
1.130 +
1.131 + // name "generation.1.space.0"
1.132 + // Counters are created from maxCapacity, capacity, initCapacity,
1.133 + // and used.
1.134 + _old_space_counters = new HSpaceCounters("space", 0 /* ordinal */,
1.135 + pad_capacity(overall_reserved()) /* max_capacity */,
1.136 + pad_capacity(old_space_committed()) /* init_capacity */,
1.137 + _old_collection_counters);
1.138 +
1.139 + // Young collection set
1.140 + // name "generation.0". This is logically the young generation.
1.141 + // The "0, 3" are paremeters for the n-th genertaion (=0) with 3 spaces.
1.142 + // See _old_collection_counters for additional counters
1.143 + _young_collection_counters = new G1YoungGenerationCounters(this, "young");
1.144 +
1.145 + // name "generation.0.space.0"
1.146 + // See _old_space_counters for additional counters
1.147 + _eden_counters = new HSpaceCounters("eden", 0 /* ordinal */,
1.148 + pad_capacity(overall_reserved()) /* max_capacity */,
1.149 + pad_capacity(eden_space_committed()) /* init_capacity */,
1.150 + _young_collection_counters);
1.151 +
1.152 + // name "generation.0.space.1"
1.153 + // See _old_space_counters for additional counters
1.154 + // Set the arguments to indicate that this survivor space is not used.
1.155 + _from_counters = new HSpaceCounters("s0", 1 /* ordinal */,
1.156 + pad_capacity(0) /* max_capacity */,
1.157 + pad_capacity(0) /* init_capacity */,
1.158 + _young_collection_counters);
1.159 +
1.160 + // name "generation.0.space.2"
1.161 + // See _old_space_counters for additional counters
1.162 + _to_counters = new HSpaceCounters("s1", 2 /* ordinal */,
1.163 + pad_capacity(overall_reserved()) /* max_capacity */,
1.164 + pad_capacity(survivor_space_committed()) /* init_capacity */,
1.165 + _young_collection_counters);
1.166 +
1.167 + if (UsePerfData) {
1.168 + // Given that this survivor space is not used, we update it here
1.169 + // once to reflect that its used space is 0 so that we don't have to
1.170 + // worry about updating it again later.
1.171 + _from_counters->update_used(0);
1.172 + }
1.173 +}
1.174 +
1.175 +void G1MonitoringSupport::recalculate_sizes() {
1.176 + G1CollectedHeap* g1 = g1h();
1.177 +
1.178 + // Recalculate all the sizes from scratch. We assume that this is
1.179 + // called at a point where no concurrent updates to the various
1.180 + // values we read here are possible (i.e., at a STW phase at the end
1.181 + // of a GC).
1.182 +
1.183 + uint young_list_length = g1->young_list()->length();
1.184 + uint survivor_list_length = g1->g1_policy()->recorded_survivor_regions();
1.185 + assert(young_list_length >= survivor_list_length, "invariant");
1.186 + uint eden_list_length = young_list_length - survivor_list_length;
1.187 + // Max length includes any potential extensions to the young gen
1.188 + // we'll do when the GC locker is active.
1.189 + uint young_list_max_length = g1->g1_policy()->young_list_max_length();
1.190 + assert(young_list_max_length >= survivor_list_length, "invariant");
1.191 + uint eden_list_max_length = young_list_max_length - survivor_list_length;
1.192 +
1.193 + _overall_used = g1->used_unlocked();
1.194 + _eden_used = (size_t) eden_list_length * HeapRegion::GrainBytes;
1.195 + _survivor_used = (size_t) survivor_list_length * HeapRegion::GrainBytes;
1.196 + _young_region_num = young_list_length;
1.197 + _old_used = subtract_up_to_zero(_overall_used, _eden_used + _survivor_used);
1.198 +
1.199 + // First calculate the committed sizes that can be calculated independently.
1.200 + _survivor_committed = _survivor_used;
1.201 + _old_committed = HeapRegion::align_up_to_region_byte_size(_old_used);
1.202 +
1.203 + // Next, start with the overall committed size.
1.204 + _overall_committed = g1->capacity();
1.205 + size_t committed = _overall_committed;
1.206 +
1.207 + // Remove the committed size we have calculated so far (for the
1.208 + // survivor and old space).
1.209 + assert(committed >= (_survivor_committed + _old_committed), "sanity");
1.210 + committed -= _survivor_committed + _old_committed;
1.211 +
1.212 + // Next, calculate and remove the committed size for the eden.
1.213 + _eden_committed = (size_t) eden_list_max_length * HeapRegion::GrainBytes;
1.214 + // Somewhat defensive: be robust in case there are inaccuracies in
1.215 + // the calculations
1.216 + _eden_committed = MIN2(_eden_committed, committed);
1.217 + committed -= _eden_committed;
1.218 +
1.219 + // Finally, give the rest to the old space...
1.220 + _old_committed += committed;
1.221 + // ..and calculate the young gen committed.
1.222 + _young_gen_committed = _eden_committed + _survivor_committed;
1.223 +
1.224 + assert(_overall_committed ==
1.225 + (_eden_committed + _survivor_committed + _old_committed),
1.226 + "the committed sizes should add up");
1.227 + // Somewhat defensive: cap the eden used size to make sure it
1.228 + // never exceeds the committed size.
1.229 + _eden_used = MIN2(_eden_used, _eden_committed);
1.230 + // _survivor_committed and _old_committed are calculated in terms of
1.231 + // the corresponding _*_used value, so the next two conditions
1.232 + // should hold.
1.233 + assert(_survivor_used <= _survivor_committed, "post-condition");
1.234 + assert(_old_used <= _old_committed, "post-condition");
1.235 +}
1.236 +
1.237 +void G1MonitoringSupport::recalculate_eden_size() {
1.238 + G1CollectedHeap* g1 = g1h();
1.239 +
1.240 + // When a new eden region is allocated, only the eden_used size is
1.241 + // affected (since we have recalculated everything else at the last GC).
1.242 +
1.243 + uint young_region_num = g1h()->young_list()->length();
1.244 + if (young_region_num > _young_region_num) {
1.245 + uint diff = young_region_num - _young_region_num;
1.246 + _eden_used += (size_t) diff * HeapRegion::GrainBytes;
1.247 + // Somewhat defensive: cap the eden used size to make sure it
1.248 + // never exceeds the committed size.
1.249 + _eden_used = MIN2(_eden_used, _eden_committed);
1.250 + _young_region_num = young_region_num;
1.251 + }
1.252 +}
1.253 +
1.254 +void G1MonitoringSupport::update_sizes() {
1.255 + recalculate_sizes();
1.256 + if (UsePerfData) {
1.257 + eden_counters()->update_capacity(pad_capacity(eden_space_committed()));
1.258 + eden_counters()->update_used(eden_space_used());
1.259 + // only the to survivor space (s1) is active, so we don't need to
1.260 + // update the counteres for the from survivor space (s0)
1.261 + to_counters()->update_capacity(pad_capacity(survivor_space_committed()));
1.262 + to_counters()->update_used(survivor_space_used());
1.263 + old_space_counters()->update_capacity(pad_capacity(old_space_committed()));
1.264 + old_space_counters()->update_used(old_space_used());
1.265 + old_collection_counters()->update_all();
1.266 + young_collection_counters()->update_all();
1.267 + MetaspaceCounters::update_performance_counters();
1.268 + CompressedClassSpaceCounters::update_performance_counters();
1.269 + }
1.270 +}
1.271 +
1.272 +void G1MonitoringSupport::update_eden_size() {
1.273 + recalculate_eden_size();
1.274 + if (UsePerfData) {
1.275 + eden_counters()->update_used(eden_space_used());
1.276 + }
1.277 +}
