Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/concurrentZFThread.cpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
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| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | f99f695bb8ef |
| children | f95d63e2154a |
| rev | line source |
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| 342 | 1 /* |
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2 * Copyright (c) 2001, 2009, Oracle and/or its affiliates. All rights reserved. |
| 342 | 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. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_concurrentZFThread.cpp.incl" | |
| 27 | |
| 28 // ======= Concurrent Zero-Fill Thread ======== | |
| 29 | |
| 30 // The CM thread is created when the G1 garbage collector is used | |
| 31 | |
| 32 int ConcurrentZFThread::_region_allocs = 0; | |
| 33 int ConcurrentZFThread::_sync_zfs = 0; | |
| 34 int ConcurrentZFThread::_zf_waits = 0; | |
| 35 int ConcurrentZFThread::_regions_filled = 0; | |
| 36 | |
| 37 ConcurrentZFThread::ConcurrentZFThread() : | |
| 936 | 38 ConcurrentGCThread() |
| 342 | 39 { |
| 40 create_and_start(); | |
| 41 } | |
| 42 | |
| 43 void ConcurrentZFThread::wait_for_ZF_completed(HeapRegion* hr) { | |
| 44 assert(ZF_mon->owned_by_self(), "Precondition."); | |
| 45 note_zf_wait(); | |
| 46 while (hr->zero_fill_state() == HeapRegion::ZeroFilling) { | |
| 47 ZF_mon->wait(Mutex::_no_safepoint_check_flag); | |
| 48 } | |
| 49 } | |
| 50 | |
| 51 void ConcurrentZFThread::processHeapRegion(HeapRegion* hr) { | |
| 52 assert(!Universe::heap()->is_gc_active(), | |
| 53 "This should not happen during GC."); | |
| 54 assert(hr != NULL, "Precondition"); | |
| 55 // These are unlocked reads, but if this test is successful, then no | |
| 56 // other thread will attempt this zero filling. Only a GC thread can | |
| 57 // modify the ZF state of a region whose state is zero-filling, and this | |
| 58 // should only happen while the ZF thread is locking out GC. | |
| 59 if (hr->zero_fill_state() == HeapRegion::ZeroFilling | |
| 60 && hr->zero_filler() == Thread::current()) { | |
| 61 assert(hr->top() == hr->bottom(), "better be empty!"); | |
| 62 assert(!hr->isHumongous(), "Only free regions on unclean list."); | |
| 63 Copy::fill_to_words(hr->bottom(), hr->capacity()/HeapWordSize); | |
| 64 note_region_filled(); | |
| 65 } | |
| 66 } | |
| 67 | |
| 68 void ConcurrentZFThread::run() { | |
| 69 initialize_in_thread(); | |
| 70 Thread* thr_self = Thread::current(); | |
| 71 _vtime_start = os::elapsedVTime(); | |
| 72 wait_for_universe_init(); | |
| 73 | |
| 74 G1CollectedHeap* g1 = G1CollectedHeap::heap(); | |
| 75 _sts.join(); | |
| 76 while (!_should_terminate) { | |
| 77 _sts.leave(); | |
| 78 | |
| 79 { | |
| 80 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 81 | |
| 82 // This local variable will hold a region being zero-filled. This | |
| 83 // region will neither be on the unclean or zero-filled lists, and | |
| 84 // will not be available for allocation; thus, we might have an | |
| 85 // allocation fail, causing a full GC, because of this, but this is a | |
| 86 // price we will pay. (In future, we might want to make the fact | |
| 87 // that there's a region being zero-filled apparent to the G1 heap, | |
| 88 // which could then wait for it in this extreme case...) | |
| 89 HeapRegion* to_fill; | |
| 90 | |
| 91 while (!g1->should_zf() | |
| 92 || (to_fill = g1->pop_unclean_region_list_locked()) == NULL) | |
| 93 ZF_mon->wait(Mutex::_no_safepoint_check_flag); | |
| 94 while (to_fill->zero_fill_state() == HeapRegion::ZeroFilling) | |
| 95 ZF_mon->wait(Mutex::_no_safepoint_check_flag); | |
| 96 | |
| 97 // So now to_fill is non-NULL and is not ZeroFilling. It might be | |
| 98 // Allocated or ZeroFilled. (The latter could happen if this thread | |
| 99 // starts the zero-filling of a region, but a GC intervenes and | |
| 100 // pushes new regions needing on the front of the filling on the | |
| 101 // front of the list.) | |
| 102 | |
| 103 switch (to_fill->zero_fill_state()) { | |
| 104 case HeapRegion::Allocated: | |
| 105 to_fill = NULL; | |
| 106 break; | |
| 107 | |
| 108 case HeapRegion::NotZeroFilled: | |
| 109 to_fill->set_zero_fill_in_progress(thr_self); | |
| 110 | |
| 111 ZF_mon->unlock(); | |
| 112 _sts.join(); | |
| 113 processHeapRegion(to_fill); | |
| 114 _sts.leave(); | |
| 115 ZF_mon->lock_without_safepoint_check(); | |
| 116 | |
| 117 if (to_fill->zero_fill_state() == HeapRegion::ZeroFilling | |
| 118 && to_fill->zero_filler() == thr_self) { | |
| 119 to_fill->set_zero_fill_complete(); | |
| 120 (void)g1->put_free_region_on_list_locked(to_fill); | |
| 121 } | |
| 122 break; | |
| 123 | |
| 124 case HeapRegion::ZeroFilled: | |
| 125 (void)g1->put_free_region_on_list_locked(to_fill); | |
| 126 break; | |
| 127 | |
| 128 case HeapRegion::ZeroFilling: | |
| 129 ShouldNotReachHere(); | |
| 130 break; | |
| 131 } | |
| 132 } | |
| 133 _vtime_accum = (os::elapsedVTime() - _vtime_start); | |
| 134 _sts.join(); | |
| 135 } | |
| 136 _sts.leave(); | |
| 137 | |
| 138 assert(_should_terminate, "just checking"); | |
| 139 terminate(); | |
| 140 } | |
| 141 | |
| 142 bool ConcurrentZFThread::offer_yield() { | |
| 143 if (_sts.should_yield()) { | |
| 144 _sts.yield("Concurrent ZF"); | |
| 145 return true; | |
| 146 } else { | |
| 147 return false; | |
| 148 } | |
| 149 } | |
| 150 | |
| 151 void ConcurrentZFThread::stop() { | |
| 152 // it is ok to take late safepoints here, if needed | |
| 153 MutexLockerEx mu(Terminator_lock); | |
| 154 _should_terminate = true; | |
| 155 while (!_has_terminated) { | |
| 156 Terminator_lock->wait(); | |
| 157 } | |
| 158 } | |
| 159 | |
| 1019 | 160 void ConcurrentZFThread::print() const { |
| 161 print_on(tty); | |
| 162 } | |
| 163 | |
| 164 void ConcurrentZFThread::print_on(outputStream* st) const { | |
| 165 st->print("\"G1 Concurrent Zero-Fill Thread\" "); | |
| 166 Thread::print_on(st); | |
| 167 st->cr(); | |
| 342 | 168 } |
| 169 | |
| 170 | |
| 171 double ConcurrentZFThread::_vtime_accum; | |
| 172 | |
| 173 void ConcurrentZFThread::print_summary_info() { | |
| 174 gclog_or_tty->print("\nConcurrent Zero-Filling:\n"); | |
| 175 gclog_or_tty->print(" Filled %d regions, used %5.2fs.\n", | |
| 176 _regions_filled, | |
| 177 vtime_accum()); | |
| 178 gclog_or_tty->print(" Of %d region allocs, %d (%5.2f%%) required sync ZF,\n", | |
| 179 _region_allocs, _sync_zfs, | |
| 180 (_region_allocs > 0 ? | |
| 181 (float)_sync_zfs/(float)_region_allocs*100.0 : | |
| 182 0.0)); | |
| 183 gclog_or_tty->print(" and %d (%5.2f%%) required a ZF wait.\n", | |
| 184 _zf_waits, | |
| 185 (_region_allocs > 0 ? | |
| 186 (float)_zf_waits/(float)_region_allocs*100.0 : | |
| 187 0.0)); | |
| 188 | |
| 189 } |