Mercurial > hg > truffle
annotate src/share/vm/utilities/yieldingWorkgroup.hpp @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
| author | tschatzl |
|---|---|
| date | Fri, 10 Oct 2014 15:51:58 +0200 |
| parents | de88570fabfc |
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| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_UTILITIES_YIELDINGWORKGROUP_HPP |
| 26 #define SHARE_VM_UTILITIES_YIELDINGWORKGROUP_HPP | |
| 27 | |
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28 #include "utilities/macros.hpp" |
| 1972 | 29 #include "utilities/workgroup.hpp" |
| 0 | 30 |
| 31 // Forward declarations | |
| 32 class YieldingFlexibleWorkGang; | |
| 33 | |
| 34 // Status of tasks | |
| 35 enum Status { | |
| 36 INACTIVE, | |
| 37 ACTIVE, | |
| 38 YIELDING, | |
| 39 YIELDED, | |
| 40 ABORTING, | |
| 41 ABORTED, | |
| 42 COMPLETING, | |
| 43 COMPLETED | |
| 44 }; | |
| 45 | |
| 46 // Class YieldingFlexibleGangWorker: | |
| 47 // Several instances of this class run in parallel as workers for a gang. | |
| 48 class YieldingFlexibleGangWorker: public GangWorker { | |
| 49 public: | |
| 50 // Ctor | |
| 51 YieldingFlexibleGangWorker(AbstractWorkGang* gang, int id) : | |
| 52 GangWorker(gang, id) { } | |
| 53 | |
| 54 public: | |
| 55 YieldingFlexibleWorkGang* yf_gang() const | |
| 56 { return (YieldingFlexibleWorkGang*)gang(); } | |
| 57 | |
| 58 protected: // Override from parent class | |
| 59 virtual void loop(); | |
| 60 }; | |
| 61 | |
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62 class FlexibleGangTask: public AbstractGangTask { |
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63 int _actual_size; // size of gang obtained |
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64 protected: |
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65 int _requested_size; // size of gang requested |
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66 public: |
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67 FlexibleGangTask(const char* name): AbstractGangTask(name), |
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68 _requested_size(0) {} |
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69 |
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70 // The abstract work method. |
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71 // The argument tells you which member of the gang you are. |
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72 virtual void work(uint worker_id) = 0; |
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73 |
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74 int requested_size() const { return _requested_size; } |
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75 int actual_size() const { return _actual_size; } |
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76 |
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77 void set_requested_size(int sz) { _requested_size = sz; } |
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78 void set_actual_size(int sz) { _actual_size = sz; } |
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79 }; |
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80 |
| 0 | 81 // An abstract task to be worked on by a flexible work gang, |
| 82 // and where the workers will periodically yield, usually | |
| 83 // in response to some condition that is signalled by means | |
| 84 // that are specific to the task at hand. | |
| 85 // You subclass this to supply your own work() method. | |
| 86 // A second feature of this kind of work gang is that | |
| 87 // it allows for the signalling of certain exceptional | |
| 88 // conditions that may be encountered during the performance | |
| 89 // of the task and that may require the task at hand to be | |
| 90 // `aborted' forthwith. Finally, these gangs are `flexible' | |
| 91 // in that they can operate at partial capacity with some | |
| 92 // gang workers waiting on the bench; in other words, the | |
| 93 // size of the active worker pool can flex (up to an apriori | |
| 94 // maximum) in response to task requests at certain points. | |
| 95 // The last part (the flexible part) has not yet been fully | |
| 96 // fleshed out and is a work in progress. | |
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97 class YieldingFlexibleGangTask: public FlexibleGangTask { |
| 0 | 98 Status _status; |
| 99 YieldingFlexibleWorkGang* _gang; | |
| 100 | |
| 101 protected: | |
| 102 // Constructor and desctructor: only construct subclasses. | |
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103 YieldingFlexibleGangTask(const char* name): FlexibleGangTask(name), |
| 0 | 104 _status(INACTIVE), |
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105 _gang(NULL) { } |
| 0 | 106 |
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107 ~YieldingFlexibleGangTask() { } |
| 0 | 108 |
| 109 friend class YieldingFlexibleWorkGang; | |
| 110 friend class YieldingFlexibleGangWorker; | |
| 111 NOT_PRODUCT(virtual bool is_YieldingFlexibleGang_task() const { | |
| 112 return true; | |
| 113 }) | |
| 114 | |
| 115 void set_status(Status s) { | |
| 116 _status = s; | |
| 117 } | |
| 118 YieldingFlexibleWorkGang* gang() { | |
| 119 return _gang; | |
| 120 } | |
| 121 void set_gang(YieldingFlexibleWorkGang* gang) { | |
| 122 assert(_gang == NULL || gang == NULL, "Clobber without intermediate reset?"); | |
| 123 _gang = gang; | |
| 124 } | |
| 125 | |
| 126 public: | |
| 127 // The abstract work method. | |
| 128 // The argument tells you which member of the gang you are. | |
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129 virtual void work(uint worker_id) = 0; |
| 0 | 130 |
| 131 // Subclasses should call the parent's yield() method | |
| 132 // after having done any work specific to the subclass. | |
| 133 virtual void yield(); | |
| 134 | |
| 135 // An abstract method supplied by | |
| 136 // a concrete sub-class which is used by the coordinator | |
| 137 // to do any "central yielding" work. | |
| 138 virtual void coordinator_yield() = 0; | |
| 139 | |
| 140 // Subclasses should call the parent's abort() method | |
| 141 // after having done any work specific to the sunbclass. | |
| 142 virtual void abort(); | |
| 143 | |
| 144 Status status() const { return _status; } | |
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145 bool yielding() const { return _status == YIELDING; } |
| 0 | 146 bool yielded() const { return _status == YIELDED; } |
| 147 bool completed() const { return _status == COMPLETED; } | |
| 148 bool aborted() const { return _status == ABORTED; } | |
| 149 bool active() const { return _status == ACTIVE; } | |
| 150 }; | |
| 151 // Class YieldingWorkGang: A subclass of WorkGang. | |
| 152 // In particular, a YieldingWorkGang is made up of | |
| 153 // YieldingGangWorkers, and provides infrastructure | |
| 154 // supporting yielding to the "GangOverseer", | |
| 155 // being the thread that orchestrates the WorkGang via run_task(). | |
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156 class YieldingFlexibleWorkGang: public FlexibleWorkGang { |
| 0 | 157 // Here's the public interface to this class. |
| 158 public: | |
| 159 // Constructor and destructor. | |
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160 YieldingFlexibleWorkGang(const char* name, uint workers, |
| 342 | 161 bool are_GC_task_threads); |
| 0 | 162 |
| 163 YieldingFlexibleGangTask* yielding_task() const { | |
| 164 assert(task() == NULL || task()->is_YieldingFlexibleGang_task(), | |
| 165 "Incorrect cast"); | |
| 166 return (YieldingFlexibleGangTask*)task(); | |
| 167 } | |
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168 // Allocate a worker and return a pointer to it. |
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169 GangWorker* allocate_worker(uint which); |
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170 |
| 0 | 171 // Run a task; returns when the task is done, or the workers yield, |
| 172 // or the task is aborted, or the work gang is terminated via stop(). | |
| 173 // A task that has been yielded can be continued via this same interface | |
| 174 // by using the same task repeatedly as the argument to the call. | |
| 175 // It is expected that the YieldingFlexibleGangTask carries the appropriate | |
| 176 // continuation information used by workers to continue the task | |
| 177 // from its last yield point. Thus, a completed task will return | |
| 178 // immediately with no actual work having been done by the workers. | |
| 179 void run_task(AbstractGangTask* task) { | |
| 180 guarantee(false, "Use start_task instead"); | |
| 181 } | |
| 182 void start_task(YieldingFlexibleGangTask* new_task); | |
| 183 void continue_task(YieldingFlexibleGangTask* gang_task); | |
| 184 | |
| 185 // Abort a currently running task, if any; returns when all the workers | |
| 186 // have stopped working on the current task and have returned to their | |
| 187 // waiting stations. | |
| 188 void abort_task(); | |
| 189 | |
| 190 // Yield: workers wait at their current working stations | |
| 191 // until signalled to proceed by the overseer. | |
| 192 void yield(); | |
| 193 | |
| 194 // Abort: workers are expected to return to their waiting | |
| 195 // stations, whence they are ready for the next task dispatched | |
| 196 // by the overseer. | |
| 197 void abort(); | |
| 198 | |
| 199 private: | |
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200 uint _yielded_workers; |
| 0 | 201 void wait_for_gang(); |
| 202 | |
| 203 public: | |
| 204 // Accessors for fields | |
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205 uint yielded_workers() const { |
| 0 | 206 return _yielded_workers; |
| 207 } | |
| 208 | |
| 209 private: | |
| 210 friend class YieldingFlexibleGangWorker; | |
| 211 void reset(); // NYI | |
| 212 }; | |
| 1972 | 213 |
| 214 #endif // SHARE_VM_UTILITIES_YIELDINGWORKGROUP_HPP |