Mercurial > hg > truffle
annotate agent/src/os/win32/Reaper.cpp @ 1994:6cd6d394f280
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
7002546: regression on SpecJbb2005 on 7b118 comparing to 7b117 on small heaps
Summary: Relaxed assertion checking related to incremental_collection_failed flag to allow for ExplicitGCInvokesConcurrent behaviour where we do not want a failing scavenge to bail to a stop-world collection. Parameterized incremental_collection_will_fail() so we can selectively use, or not use, as appropriate, the statistical prediction at specific use sites. This essentially reverts the scavenge bail-out logic to what it was prior to some recent changes that had inadvertently started using the statistical prediction which can be noisy in the presence of bursty loads. Added some associated verbose non-product debugging messages.
Reviewed-by: johnc, tonyp
| author | ysr |
|---|---|
| date | Tue, 07 Dec 2010 21:55:53 -0800 |
| parents | c18cbe5936b8 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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2 * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved. |
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| 5 * This code is free software; you can redistribute it and/or modify it | |
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| 7 * published by the Free Software Foundation. | |
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| 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). | |
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| 15 * You should have received a copy of the GNU General Public License version | |
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| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 #include <iostream> | |
| 26 #include "Reaper.hpp" | |
| 27 | |
| 28 using namespace std; | |
| 29 | |
| 30 Reaper::Reaper(ReaperCB* cb) { | |
| 31 InitializeCriticalSection(&crit); | |
| 32 event = CreateEvent(NULL, TRUE, FALSE, NULL); | |
| 33 this->cb = cb; | |
| 34 | |
| 35 active = false; | |
| 36 shouldShutDown = false; | |
| 37 } | |
| 38 | |
| 39 bool | |
| 40 Reaper::start() { | |
| 41 bool result = false; | |
| 42 | |
| 43 EnterCriticalSection(&crit); | |
| 44 | |
| 45 if (!active) { | |
| 46 DWORD id; | |
| 47 HANDLE reaper = CreateThread(NULL, 0, &Reaper::reaperThreadEntry, | |
| 48 this, 0, &id); | |
| 49 if (reaper != NULL) { | |
| 50 result = true; | |
| 51 } | |
| 52 } | |
| 53 | |
| 54 LeaveCriticalSection(&crit); | |
| 55 | |
| 56 return result; | |
| 57 } | |
| 58 | |
| 59 bool | |
| 60 Reaper::stop() { | |
| 61 bool result = false; | |
| 62 | |
| 63 EnterCriticalSection(&crit); | |
| 64 | |
| 65 if (active) { | |
| 66 shouldShutDown = true; | |
| 67 SetEvent(event); | |
| 68 while (active) { | |
| 69 Sleep(1); | |
| 70 } | |
| 71 shouldShutDown = false; | |
| 72 result = true; | |
| 73 } | |
| 74 | |
| 75 LeaveCriticalSection(&crit); | |
| 76 | |
| 77 return result; | |
| 78 } | |
| 79 | |
| 80 void | |
| 81 Reaper::registerProcess(HANDLE processHandle, void* userData) { | |
| 82 ProcessInfo info; | |
| 83 | |
| 84 info.handle = processHandle; | |
| 85 info.userData = userData; | |
| 86 | |
| 87 EnterCriticalSection(&crit); | |
| 88 | |
| 89 procInfo.push_back(info); | |
| 90 SetEvent(event); | |
| 91 | |
| 92 LeaveCriticalSection(&crit); | |
| 93 } | |
| 94 | |
| 95 void | |
| 96 Reaper::reaperThread() { | |
| 97 while (!shouldShutDown) { | |
| 98 // Take atomic snapshot of the current process list and user data | |
| 99 EnterCriticalSection(&crit); | |
| 100 | |
| 101 int num = procInfo.size(); | |
| 102 HANDLE* handleList = new HANDLE[1 + num]; | |
| 103 void** dataList = new void*[num]; | |
| 104 for (int i = 0; i < num; i++) { | |
| 105 handleList[i] = procInfo[i].handle; | |
| 106 dataList[i] = procInfo[i].userData; | |
| 107 } | |
| 108 | |
| 109 LeaveCriticalSection(&crit); | |
| 110 | |
| 111 // Topmost handle becomes the event object, so other threads can | |
| 112 // signal this one to notice differences in the above list (or | |
| 113 // shut down) | |
| 114 handleList[num] = event; | |
| 115 | |
| 116 // Wait for these objects | |
| 117 DWORD idx = WaitForMultipleObjects(1 + num, handleList, | |
| 118 FALSE, INFINITE); | |
| 119 if ((idx >= WAIT_OBJECT_0) && (idx <= WAIT_OBJECT_0 + num)) { | |
| 120 idx -= WAIT_OBJECT_0; | |
| 121 if (idx < num) { | |
| 122 // A process exited (i.e., it wasn't that we were woken up | |
| 123 // just because the event went off) | |
| 124 (*cb)(dataList[idx]); | |
| 125 // Remove this process from the list (NOTE: requires that | |
| 126 // ordering does not change, i.e., that all additions are to | |
| 127 // the back of the process list) | |
| 128 EnterCriticalSection(&crit); | |
| 129 | |
| 130 std::vector<ProcessInfo>::iterator iter = procInfo.begin(); | |
| 131 iter += idx; | |
| 132 procInfo.erase(iter); | |
| 133 | |
| 134 LeaveCriticalSection(&crit); | |
| 135 } else { | |
| 136 // Notification from other thread | |
| 137 ResetEvent(event); | |
| 138 } | |
| 139 } else { | |
| 140 // Unexpected return value. For now, warn. | |
| 141 cerr << "Reaper::reaperThread(): unexpected return value " | |
| 142 << idx << " from WaitForMultipleObjects" << endl; | |
| 143 } | |
| 144 | |
| 145 // Clean up these lists | |
| 146 delete[] handleList; | |
| 147 delete[] dataList; | |
| 148 } | |
| 149 | |
| 150 // Time to shut down | |
| 151 active = false; | |
| 152 } | |
| 153 | |
| 154 DWORD WINAPI | |
| 155 Reaper::reaperThreadEntry(LPVOID data) { | |
| 156 Reaper* reaper = (Reaper*) data; | |
| 157 reaper->reaperThread(); | |
| 158 return 0; | |
| 159 } |