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annotate src/share/vm/gc_implementation/g1/vm_operations_g1.cpp @ 1710:94251661de76
6970376: ParNew: shared TaskQueue statistics
Reviewed-by: ysr
author | jcoomes |
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date | Mon, 09 Aug 2010 18:03:50 -0700 |
parents | 4e5661ba9d98 |
children | f95d63e2154a |
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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/_vm_operations_g1.cpp.incl" | |
27 | |
28 void VM_G1CollectForAllocation::doit() { | |
29 JvmtiGCForAllocationMarker jgcm; | |
30 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
31 _res = g1h->satisfy_failed_allocation(_size); | |
32 assert(g1h->is_in_or_null(_res), "result not in heap"); | |
33 } | |
34 | |
35 void VM_G1CollectFull::doit() { | |
36 JvmtiGCFullMarker jgcm; | |
37 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
38 GCCauseSetter x(g1h, _gc_cause); | |
39 g1h->do_full_collection(false /* clear_all_soft_refs */); | |
40 } | |
41 | |
42 void VM_G1IncCollectionPause::doit() { | |
43 JvmtiGCForAllocationMarker jgcm; | |
44 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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45 assert(!_should_initiate_conc_mark || |
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46 ((_gc_cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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47 (_gc_cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)), |
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48 "only a GC locker or a System.gc() induced GC should start a cycle"); |
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49 |
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50 GCCauseSetter x(g1h, _gc_cause); |
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51 if (_should_initiate_conc_mark) { |
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52 // It's safer to read full_collections_completed() here, given |
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53 // that noone else will be updating it concurrently. Since we'll |
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54 // only need it if we're initiating a marking cycle, no point in |
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55 // setting it earlier. |
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56 _full_collections_completed_before = g1h->full_collections_completed(); |
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57 |
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58 // At this point we are supposed to start a concurrent cycle. We |
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59 // will do so if one is not already in progress. |
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60 bool res = g1h->g1_policy()->force_initial_mark_if_outside_cycle(); |
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61 } |
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62 g1h->do_collection_pause_at_safepoint(_target_pause_time_ms); |
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63 } |
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64 |
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65 void VM_G1IncCollectionPause::doit_epilogue() { |
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66 VM_GC_Operation::doit_epilogue(); |
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67 |
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68 // If the pause was initiated by a System.gc() and |
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69 // +ExplicitGCInvokesConcurrent, we have to wait here for the cycle |
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70 // that just started (or maybe one that was already in progress) to |
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71 // finish. |
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72 if (_gc_cause == GCCause::_java_lang_system_gc && |
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73 _should_initiate_conc_mark) { |
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74 assert(ExplicitGCInvokesConcurrent, |
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75 "the only way to be here is if ExplicitGCInvokesConcurrent is set"); |
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76 |
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77 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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78 |
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79 // In the doit() method we saved g1h->full_collections_completed() |
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80 // in the _full_collections_completed_before field. We have to |
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81 // wait until we observe that g1h->full_collections_completed() |
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82 // has increased by at least one. This can happen if a) we started |
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83 // a cycle and it completes, b) a cycle already in progress |
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84 // completes, or c) a Full GC happens. |
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85 |
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86 // If the condition has already been reached, there's no point in |
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87 // actually taking the lock and doing the wait. |
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88 if (g1h->full_collections_completed() <= |
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89 _full_collections_completed_before) { |
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90 // The following is largely copied from CMS |
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91 |
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92 Thread* thr = Thread::current(); |
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93 assert(thr->is_Java_thread(), "invariant"); |
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94 JavaThread* jt = (JavaThread*)thr; |
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95 ThreadToNativeFromVM native(jt); |
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96 |
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97 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
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98 while (g1h->full_collections_completed() <= |
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99 _full_collections_completed_before) { |
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100 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag); |
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101 } |
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102 } |
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103 } |
342 | 104 } |
105 | |
106 void VM_CGC_Operation::doit() { | |
107 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
108 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
109 TraceTime t(_printGCMessage, PrintGC, true, gclog_or_tty); | |
110 SharedHeap* sh = SharedHeap::heap(); | |
111 // This could go away if CollectedHeap gave access to _gc_is_active... | |
112 if (sh != NULL) { | |
113 IsGCActiveMark x; | |
114 _cl->do_void(); | |
115 } else { | |
116 _cl->do_void(); | |
117 } | |
118 } | |
119 | |
120 bool VM_CGC_Operation::doit_prologue() { | |
121 Heap_lock->lock(); | |
122 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = true; | |
123 return true; | |
124 } | |
125 | |
126 void VM_CGC_Operation::doit_epilogue() { | |
127 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = false; | |
128 Heap_lock->unlock(); | |
129 } |