Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp @ 3285:49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
Summary: It introduces non-product cmd line parameter G1DummyRegionsPerGC which indicates how many "dummy" regions to allocate at the end of each GC. This allows the G1 heap to grow artificially and makes concurrent marking cycles more frequent irrespective of what the application that is running is doing. The dummy regions will be found totally empty during cleanup so this parameter can also be used to stress the concurrent cleanup operation.
Reviewed-by: brutisso, johnc
| author | tonyp |
|---|---|
| date | Tue, 19 Apr 2011 15:46:59 -0400 |
| parents | f95d63e2154a |
| children | bca17e38de00 |
| rev | line source |
|---|---|
| 0 | 1 |
| 2 /* | |
| 1972 | 3 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 5 * | |
| 6 * This code is free software; you can redistribute it and/or modify it | |
| 7 * under the terms of the GNU General Public License version 2 only, as | |
| 8 * published by the Free Software Foundation. | |
| 9 * | |
| 10 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 13 * version 2 for more details (a copy is included in the LICENSE file that | |
| 14 * accompanied this code). | |
| 15 * | |
| 16 * You should have received a copy of the GNU General Public License version | |
| 17 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 19 * | |
|
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
| 0 | 23 * |
| 24 */ | |
| 25 | |
| 1972 | 26 #include "precompiled.hpp" |
| 27 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
| 28 #include "gc_implementation/parallelScavenge/gcTaskThread.hpp" | |
| 29 #include "memory/allocation.hpp" | |
| 30 #include "memory/allocation.inline.hpp" | |
| 31 #include "memory/resourceArea.hpp" | |
| 32 #include "runtime/handles.hpp" | |
| 33 #include "runtime/handles.inline.hpp" | |
| 34 #include "runtime/os.hpp" | |
| 35 #include "runtime/thread.hpp" | |
| 0 | 36 |
| 37 GCTaskThread::GCTaskThread(GCTaskManager* manager, | |
| 38 uint which, | |
| 39 uint processor_id) : | |
| 40 _manager(manager), | |
| 41 _processor_id(processor_id), | |
| 42 _time_stamps(NULL), | |
| 43 _time_stamp_index(0) | |
| 44 { | |
| 45 if (!os::create_thread(this, os::pgc_thread)) | |
| 46 vm_exit_out_of_memory(0, "Cannot create GC thread. Out of system resources."); | |
| 47 | |
| 48 if (PrintGCTaskTimeStamps) { | |
| 49 _time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries ); | |
| 50 | |
| 51 guarantee(_time_stamps != NULL, "Sanity"); | |
| 52 } | |
| 53 set_id(which); | |
| 54 set_name("GC task thread#%d (ParallelGC)", which); | |
| 55 } | |
| 56 | |
| 57 GCTaskThread::~GCTaskThread() { | |
| 58 if (_time_stamps != NULL) { | |
| 59 FREE_C_HEAP_ARRAY(GCTaskTimeStamp, _time_stamps); | |
| 60 } | |
| 61 } | |
| 62 | |
| 63 void GCTaskThread::start() { | |
| 64 os::start_thread(this); | |
| 65 } | |
| 66 | |
| 67 GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) { | |
| 68 guarantee(index < GCTaskTimeStampEntries, "increase GCTaskTimeStampEntries"); | |
| 69 | |
| 70 return &(_time_stamps[index]); | |
| 71 } | |
| 72 | |
| 73 void GCTaskThread::print_task_time_stamps() { | |
| 74 assert(PrintGCTaskTimeStamps, "Sanity"); | |
| 75 assert(_time_stamps != NULL, "Sanity (Probably set PrintGCTaskTimeStamps late)"); | |
| 76 | |
| 77 tty->print_cr("GC-Thread %u entries: %d", id(), _time_stamp_index); | |
| 78 for(uint i=0; i<_time_stamp_index; i++) { | |
| 79 GCTaskTimeStamp* time_stamp = time_stamp_at(i); | |
| 80 tty->print_cr("\t[ %s " INT64_FORMAT " " INT64_FORMAT " ]", | |
| 81 time_stamp->name(), | |
| 82 time_stamp->entry_time(), | |
| 83 time_stamp->exit_time()); | |
| 84 } | |
| 85 | |
| 86 // Reset after dumping the data | |
| 87 _time_stamp_index = 0; | |
| 88 } | |
| 89 | |
| 90 void GCTaskThread::print_on(outputStream* st) const { | |
| 91 st->print("\"%s\" ", name()); | |
| 92 Thread::print_on(st); | |
| 93 st->cr(); | |
| 94 } | |
| 95 | |
| 96 void GCTaskThread::run() { | |
| 97 // Set up the thread for stack overflow support | |
| 98 this->record_stack_base_and_size(); | |
| 99 this->initialize_thread_local_storage(); | |
| 100 // Bind yourself to your processor. | |
| 101 if (processor_id() != GCTaskManager::sentinel_worker()) { | |
| 102 if (TraceGCTaskThread) { | |
| 103 tty->print_cr("GCTaskThread::run: " | |
| 104 " binding to processor %u", processor_id()); | |
| 105 } | |
| 106 if (!os::bind_to_processor(processor_id())) { | |
| 107 DEBUG_ONLY( | |
| 108 warning("Couldn't bind GCTaskThread %u to processor %u", | |
| 109 which(), processor_id()); | |
| 110 ) | |
| 111 } | |
| 112 } | |
| 113 // Part of thread setup. | |
| 114 // ??? Are these set up once here to make subsequent ones fast? | |
| 115 HandleMark hm_outer; | |
| 116 ResourceMark rm_outer; | |
| 117 | |
| 118 TimeStamp timer; | |
| 119 | |
| 120 for (;/* ever */;) { | |
| 121 // These are so we can flush the resources allocated in the inner loop. | |
| 122 HandleMark hm_inner; | |
| 123 ResourceMark rm_inner; | |
| 124 for (; /* break */; ) { | |
| 125 // This will block until there is a task to be gotten. | |
| 126 GCTask* task = manager()->get_task(which()); | |
| 127 | |
| 128 // In case the update is costly | |
| 129 if (PrintGCTaskTimeStamps) { | |
| 130 timer.update(); | |
| 131 } | |
| 132 | |
| 133 jlong entry_time = timer.ticks(); | |
| 134 char* name = task->name(); | |
| 135 | |
| 136 task->do_it(manager(), which()); | |
| 137 manager()->note_completion(which()); | |
| 138 | |
| 139 if (PrintGCTaskTimeStamps) { | |
| 140 assert(_time_stamps != NULL, "Sanity (PrintGCTaskTimeStamps set late?)"); | |
| 141 | |
| 142 timer.update(); | |
| 143 | |
| 144 GCTaskTimeStamp* time_stamp = time_stamp_at(_time_stamp_index++); | |
| 145 | |
| 146 time_stamp->set_name(name); | |
| 147 time_stamp->set_entry_time(entry_time); | |
| 148 time_stamp->set_exit_time(timer.ticks()); | |
| 149 } | |
| 150 | |
| 151 // Check if we should release our inner resources. | |
| 152 if (manager()->should_release_resources(which())) { | |
| 153 manager()->note_release(which()); | |
| 154 break; | |
| 155 } | |
| 156 } | |
| 157 } | |
| 158 } |