Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1MonitoringSupport.cpp @ 8081:579f6adb7f51
8003539: Minimal VM don't react to -Dcom.sun.management and -XX:+ManagementServer
Summary: A warning message should be displayed if these options are used with the Minimal VM.
Reviewed-by: dholmes, dsamersoff
author | jprovino |
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date | Tue, 05 Feb 2013 13:32:34 -0500 |
parents | da91efe96a93 |
children | 1a8fb39bdbc4 |
rev | line source |
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2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
3289 | 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_implementation/g1/g1MonitoringSupport.hpp" | |
27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
28 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
29 | |
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30 G1GenerationCounters::G1GenerationCounters(G1MonitoringSupport* g1mm, |
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31 const char* name, |
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32 int ordinal, int spaces, |
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33 size_t min_capacity, |
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34 size_t max_capacity, |
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35 size_t curr_capacity) |
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36 : GenerationCounters(name, ordinal, spaces, min_capacity, |
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37 max_capacity, curr_capacity), _g1mm(g1mm) { } |
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38 |
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39 // We pad the capacity three times given that the young generation |
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40 // contains three spaces (eden and two survivors). |
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41 G1YoungGenerationCounters::G1YoungGenerationCounters(G1MonitoringSupport* g1mm, |
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42 const char* name) |
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43 : G1GenerationCounters(g1mm, name, 0 /* ordinal */, 3 /* spaces */, |
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44 G1MonitoringSupport::pad_capacity(0, 3) /* min_capacity */, |
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45 G1MonitoringSupport::pad_capacity(g1mm->young_gen_max(), 3), |
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46 G1MonitoringSupport::pad_capacity(0, 3) /* curr_capacity */) { |
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47 if (UsePerfData) { |
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48 update_all(); |
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49 } |
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50 } |
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51 |
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52 G1OldGenerationCounters::G1OldGenerationCounters(G1MonitoringSupport* g1mm, |
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53 const char* name) |
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54 : G1GenerationCounters(g1mm, name, 1 /* ordinal */, 1 /* spaces */, |
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55 G1MonitoringSupport::pad_capacity(0) /* min_capacity */, |
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56 G1MonitoringSupport::pad_capacity(g1mm->old_gen_max()), |
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57 G1MonitoringSupport::pad_capacity(0) /* curr_capacity */) { |
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58 if (UsePerfData) { |
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59 update_all(); |
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60 } |
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61 } |
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62 |
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63 void G1YoungGenerationCounters::update_all() { |
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64 size_t committed = |
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65 G1MonitoringSupport::pad_capacity(_g1mm->young_gen_committed(), 3); |
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66 _current_size->set_value(committed); |
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67 } |
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68 |
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69 void G1OldGenerationCounters::update_all() { |
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70 size_t committed = |
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71 G1MonitoringSupport::pad_capacity(_g1mm->old_gen_committed()); |
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72 _current_size->set_value(committed); |
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73 } |
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74 |
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75 G1MonitoringSupport::G1MonitoringSupport(G1CollectedHeap* g1h) : |
3289 | 76 _g1h(g1h), |
77 _incremental_collection_counters(NULL), | |
78 _full_collection_counters(NULL), | |
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79 _old_collection_counters(NULL), |
3289 | 80 _old_space_counters(NULL), |
81 _young_collection_counters(NULL), | |
82 _eden_counters(NULL), | |
83 _from_counters(NULL), | |
84 _to_counters(NULL), | |
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85 |
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86 _overall_reserved(0), |
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87 _overall_committed(0), _overall_used(0), |
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88 _young_region_num(0), |
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89 _young_gen_committed(0), |
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90 _eden_committed(0), _eden_used(0), |
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91 _survivor_committed(0), _survivor_used(0), |
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92 _old_committed(0), _old_used(0) { |
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93 |
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94 _overall_reserved = g1h->max_capacity(); |
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95 recalculate_sizes(); |
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96 |
3289 | 97 // Counters for GC collections |
98 // | |
99 // name "collector.0". In a generational collector this would be the | |
100 // young generation collection. | |
101 _incremental_collection_counters = | |
102 new CollectorCounters("G1 incremental collections", 0); | |
103 // name "collector.1". In a generational collector this would be the | |
104 // old generation collection. | |
105 _full_collection_counters = | |
106 new CollectorCounters("G1 stop-the-world full collections", 1); | |
107 | |
108 // timer sampling for all counters supporting sampling only update the | |
109 // used value. See the take_sample() method. G1 requires both used and | |
110 // capacity updated so sampling is not currently used. It might | |
111 // be sufficient to update all counters in take_sample() even though | |
112 // take_sample() only returns "used". When sampling was used, there | |
113 // were some anomolous values emitted which may have been the consequence | |
114 // of not updating all values simultaneously (i.e., see the calculation done | |
115 // in eden_space_used(), is it possbile that the values used to | |
116 // calculate either eden_used or survivor_used are being updated by | |
117 // the collector when the sample is being done?). | |
118 const bool sampled = false; | |
119 | |
120 // "Generation" and "Space" counters. | |
121 // | |
122 // name "generation.1" This is logically the old generation in | |
123 // generational GC terms. The "1, 1" parameters are for | |
124 // the n-th generation (=1) with 1 space. | |
125 // Counters are created from minCapacity, maxCapacity, and capacity | |
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126 _old_collection_counters = new G1OldGenerationCounters(this, "old"); |
3289 | 127 |
128 // name "generation.1.space.0" | |
129 // Counters are created from maxCapacity, capacity, initCapacity, | |
130 // and used. | |
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131 _old_space_counters = new HSpaceCounters("space", 0 /* ordinal */, |
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132 pad_capacity(overall_reserved()) /* max_capacity */, |
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133 pad_capacity(old_space_committed()) /* init_capacity */, |
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134 _old_collection_counters); |
3289 | 135 |
136 // Young collection set | |
137 // name "generation.0". This is logically the young generation. | |
138 // The "0, 3" are paremeters for the n-th genertaion (=0) with 3 spaces. | |
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139 // See _old_collection_counters for additional counters |
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140 _young_collection_counters = new G1YoungGenerationCounters(this, "young"); |
3289 | 141 |
142 // name "generation.0.space.0" | |
143 // See _old_space_counters for additional counters | |
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144 _eden_counters = new HSpaceCounters("eden", 0 /* ordinal */, |
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145 pad_capacity(overall_reserved()) /* max_capacity */, |
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146 pad_capacity(eden_space_committed()) /* init_capacity */, |
3289 | 147 _young_collection_counters); |
148 | |
149 // name "generation.0.space.1" | |
150 // See _old_space_counters for additional counters | |
151 // Set the arguments to indicate that this survivor space is not used. | |
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152 _from_counters = new HSpaceCounters("s0", 1 /* ordinal */, |
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153 pad_capacity(0) /* max_capacity */, |
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154 pad_capacity(0) /* init_capacity */, |
3289 | 155 _young_collection_counters); |
156 | |
157 // name "generation.0.space.2" | |
158 // See _old_space_counters for additional counters | |
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159 _to_counters = new HSpaceCounters("s1", 2 /* ordinal */, |
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160 pad_capacity(overall_reserved()) /* max_capacity */, |
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161 pad_capacity(survivor_space_committed()) /* init_capacity */, |
3289 | 162 _young_collection_counters); |
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163 |
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164 if (UsePerfData) { |
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165 // Given that this survivor space is not used, we update it here |
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166 // once to reflect that its used space is 0 so that we don't have to |
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167 // worry about updating it again later. |
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168 _from_counters->update_used(0); |
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169 } |
3289 | 170 } |
171 | |
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172 void G1MonitoringSupport::recalculate_sizes() { |
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173 G1CollectedHeap* g1 = g1h(); |
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174 |
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175 // Recalculate all the sizes from scratch. We assume that this is |
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176 // called at a point where no concurrent updates to the various |
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177 // values we read here are possible (i.e., at a STW phase at the end |
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178 // of a GC). |
3289 | 179 |
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180 uint young_list_length = g1->young_list()->length(); |
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181 uint survivor_list_length = g1->g1_policy()->recorded_survivor_regions(); |
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182 assert(young_list_length >= survivor_list_length, "invariant"); |
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183 uint eden_list_length = young_list_length - survivor_list_length; |
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184 // Max length includes any potential extensions to the young gen |
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185 // we'll do when the GC locker is active. |
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186 uint young_list_max_length = g1->g1_policy()->young_list_max_length(); |
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187 assert(young_list_max_length >= survivor_list_length, "invariant"); |
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188 uint eden_list_max_length = young_list_max_length - survivor_list_length; |
3289 | 189 |
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190 _overall_used = g1->used_unlocked(); |
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191 _eden_used = (size_t) eden_list_length * HeapRegion::GrainBytes; |
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192 _survivor_used = (size_t) survivor_list_length * HeapRegion::GrainBytes; |
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193 _young_region_num = young_list_length; |
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194 _old_used = subtract_up_to_zero(_overall_used, _eden_used + _survivor_used); |
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195 |
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196 // First calculate the committed sizes that can be calculated independently. |
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197 _survivor_committed = _survivor_used; |
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198 _old_committed = HeapRegion::align_up_to_region_byte_size(_old_used); |
3289 | 199 |
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200 // Next, start with the overall committed size. |
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201 _overall_committed = g1->capacity(); |
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202 size_t committed = _overall_committed; |
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203 |
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204 // Remove the committed size we have calculated so far (for the |
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205 // survivor and old space). |
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206 assert(committed >= (_survivor_committed + _old_committed), "sanity"); |
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207 committed -= _survivor_committed + _old_committed; |
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208 |
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209 // Next, calculate and remove the committed size for the eden. |
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210 _eden_committed = (size_t) eden_list_max_length * HeapRegion::GrainBytes; |
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211 // Somewhat defensive: be robust in case there are inaccuracies in |
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212 // the calculations |
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213 _eden_committed = MIN2(_eden_committed, committed); |
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214 committed -= _eden_committed; |
3289 | 215 |
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216 // Finally, give the rest to the old space... |
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217 _old_committed += committed; |
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218 // ..and calculate the young gen committed. |
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219 _young_gen_committed = _eden_committed + _survivor_committed; |
3289 | 220 |
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221 assert(_overall_committed == |
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222 (_eden_committed + _survivor_committed + _old_committed), |
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223 "the committed sizes should add up"); |
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224 // Somewhat defensive: cap the eden used size to make sure it |
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225 // never exceeds the committed size. |
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226 _eden_used = MIN2(_eden_used, _eden_committed); |
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227 // _survivor_committed and _old_committed are calculated in terms of |
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228 // the corresponding _*_used value, so the next two conditions |
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229 // should hold. |
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230 assert(_survivor_used <= _survivor_committed, "post-condition"); |
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231 assert(_old_used <= _old_committed, "post-condition"); |
3289 | 232 } |
233 | |
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234 void G1MonitoringSupport::recalculate_eden_size() { |
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235 G1CollectedHeap* g1 = g1h(); |
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236 |
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237 // When a new eden region is allocated, only the eden_used size is |
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238 // affected (since we have recalculated everything else at the last GC). |
3289 | 239 |
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240 uint young_region_num = g1h()->young_list()->length(); |
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241 if (young_region_num > _young_region_num) { |
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242 uint diff = young_region_num - _young_region_num; |
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243 _eden_used += (size_t) diff * HeapRegion::GrainBytes; |
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244 // Somewhat defensive: cap the eden used size to make sure it |
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245 // never exceeds the committed size. |
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246 _eden_used = MIN2(_eden_used, _eden_committed); |
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247 _young_region_num = young_region_num; |
3289 | 248 } |
249 } | |
250 | |
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251 void G1MonitoringSupport::update_sizes() { |
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252 recalculate_sizes(); |
3289 | 253 if (UsePerfData) { |
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254 eden_counters()->update_capacity(pad_capacity(eden_space_committed())); |
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255 eden_counters()->update_used(eden_space_used()); |
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256 // only the to survivor space (s1) is active, so we don't need to |
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257 // update the counteres for the from survivor space (s0) |
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258 to_counters()->update_capacity(pad_capacity(survivor_space_committed())); |
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259 to_counters()->update_used(survivor_space_used()); |
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260 old_space_counters()->update_capacity(pad_capacity(old_space_committed())); |
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261 old_space_counters()->update_used(old_space_used()); |
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262 old_collection_counters()->update_all(); |
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263 young_collection_counters()->update_all(); |
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264 MetaspaceCounters::update_performance_counters(); |
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265 } |
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266 } |
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267 |
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268 void G1MonitoringSupport::update_eden_size() { |
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269 recalculate_eden_size(); |
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270 if (UsePerfData) { |
3289 | 271 eden_counters()->update_used(eden_space_used()); |
272 } | |
273 } |