Mercurial > hg > truffle
comparison src/share/vm/gc_implementation/g1/heapRegionSets.cpp @ 4072:8aae2050e83e
7092309: G1: introduce old region set
Summary: Keep track of all the old regions in the heap with a heap region set.
Reviewed-by: brutisso, johnc
author | tonyp |
---|---|
date | Mon, 07 Nov 2011 22:11:12 -0500 |
parents | e8b0b0392037 |
children | 58fc1b1523dc |
comparison
equal
deleted
inserted
replaced
4071:ed80554efa25 | 4072:8aae2050e83e |
---|---|
24 | 24 |
25 #include "precompiled.hpp" | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/heapRegionRemSet.hpp" | 26 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
27 #include "gc_implementation/g1/heapRegionSets.hpp" | 27 #include "gc_implementation/g1/heapRegionSets.hpp" |
28 | 28 |
29 // Note on the check_mt_safety() methods below: | |
30 // | |
31 // Verification of the "master" heap region sets / lists that are | |
32 // maintained by G1CollectedHeap is always done during a STW pause and | |
33 // by the VM thread at the start / end of the pause. The standard | |
34 // verification methods all assert check_mt_safety(). This is | |
35 // important as it ensures that verification is done without | |
36 // concurrent updates taking place at the same time. It follows, that, | |
37 // for the "master" heap region sets / lists, the check_mt_safety() | |
38 // method should include the VM thread / STW case. | |
39 | |
29 //////////////////// FreeRegionList //////////////////// | 40 //////////////////// FreeRegionList //////////////////// |
30 | 41 |
31 const char* FreeRegionList::verify_region_extra(HeapRegion* hr) { | 42 const char* FreeRegionList::verify_region_extra(HeapRegion* hr) { |
32 if (hr->is_young()) { | 43 if (hr->is_young()) { |
33 return "the region should not be young"; | 44 return "the region should not be young"; |
34 } | 45 } |
35 // The superclass will check that the region is empty and | 46 // The superclass will check that the region is empty and |
36 // not-humongous. | 47 // not humongous. |
37 return HeapRegionLinkedList::verify_region_extra(hr); | 48 return HeapRegionLinkedList::verify_region_extra(hr); |
38 } | 49 } |
39 | 50 |
40 //////////////////// MasterFreeRegionList //////////////////// | 51 //////////////////// MasterFreeRegionList //////////////////// |
41 | 52 |
56 // them) or by the GC workers while holding the | 67 // them) or by the GC workers while holding the |
57 // FreeList_lock. | 68 // FreeList_lock. |
58 // (b) If we're not at a safepoint, operations on the master free | 69 // (b) If we're not at a safepoint, operations on the master free |
59 // list should be invoked while holding the Heap_lock. | 70 // list should be invoked while holding the Heap_lock. |
60 | 71 |
61 guarantee((SafepointSynchronize::is_at_safepoint() && | 72 if (SafepointSynchronize::is_at_safepoint()) { |
62 (Thread::current()->is_VM_thread() || | 73 guarantee(Thread::current()->is_VM_thread() || |
63 FreeList_lock->owned_by_self())) || | 74 FreeList_lock->owned_by_self(), |
64 (!SafepointSynchronize::is_at_safepoint() && | 75 hrs_ext_msg(this, "master free list MT safety protocol " |
65 Heap_lock->owned_by_self()), | 76 "at a safepoint")); |
66 hrs_ext_msg(this, "master free list MT safety protocol")); | 77 } else { |
78 guarantee(Heap_lock->owned_by_self(), | |
79 hrs_ext_msg(this, "master free list MT safety protocol " | |
80 "outside a safepoint")); | |
81 } | |
67 | 82 |
68 return FreeRegionList::check_mt_safety(); | 83 return FreeRegionList::check_mt_safety(); |
69 } | 84 } |
70 | 85 |
71 //////////////////// SecondaryFreeRegionList //////////////////// | 86 //////////////////// SecondaryFreeRegionList //////////////////// |
77 | 92 |
78 guarantee(SecondaryFreeList_lock->owned_by_self(), | 93 guarantee(SecondaryFreeList_lock->owned_by_self(), |
79 hrs_ext_msg(this, "secondary free list MT safety protocol")); | 94 hrs_ext_msg(this, "secondary free list MT safety protocol")); |
80 | 95 |
81 return FreeRegionList::check_mt_safety(); | 96 return FreeRegionList::check_mt_safety(); |
97 } | |
98 | |
99 //////////////////// OldRegionSet //////////////////// | |
100 | |
101 const char* OldRegionSet::verify_region_extra(HeapRegion* hr) { | |
102 if (hr->is_young()) { | |
103 return "the region should not be young"; | |
104 } | |
105 // The superclass will check that the region is not empty and not | |
106 // humongous. | |
107 return HeapRegionSet::verify_region_extra(hr); | |
108 } | |
109 | |
110 //////////////////// MasterOldRegionSet //////////////////// | |
111 | |
112 bool MasterOldRegionSet::check_mt_safety() { | |
113 // Master Old Set MT safety protocol: | |
114 // (a) If we're at a safepoint, operations on the master old set | |
115 // should be invoked: | |
116 // - by the VM thread (which will serialize them), or | |
117 // - by the GC workers while holding the FreeList_lock, if we're | |
118 // at a safepoint for an evacuation pause (this lock is taken | |
119 // anyway when an GC alloc region is retired so that a new one | |
120 // is allocated from the free list), or | |
121 // - by the GC workers while holding the OldSets_lock, if we're at a | |
122 // safepoint for a cleanup pause. | |
123 // (b) If we're not at a safepoint, operations on the master old set | |
124 // should be invoked while holding the Heap_lock. | |
125 | |
126 if (SafepointSynchronize::is_at_safepoint()) { | |
127 guarantee(Thread::current()->is_VM_thread() || | |
128 _phase == HRSPhaseEvacuation && FreeList_lock->owned_by_self() || | |
129 _phase == HRSPhaseCleanup && OldSets_lock->owned_by_self(), | |
130 hrs_ext_msg(this, "master old set MT safety protocol " | |
131 "at a safepoint")); | |
132 } else { | |
133 guarantee(Heap_lock->owned_by_self(), | |
134 hrs_ext_msg(this, "master old set MT safety protocol " | |
135 "outside a safepoint")); | |
136 } | |
137 | |
138 return OldRegionSet::check_mt_safety(); | |
82 } | 139 } |
83 | 140 |
84 //////////////////// HumongousRegionSet //////////////////// | 141 //////////////////// HumongousRegionSet //////////////////// |
85 | 142 |
86 const char* HumongousRegionSet::verify_region_extra(HeapRegion* hr) { | 143 const char* HumongousRegionSet::verify_region_extra(HeapRegion* hr) { |
101 // serialize them) or by the GC workers while holding the | 158 // serialize them) or by the GC workers while holding the |
102 // OldSets_lock. | 159 // OldSets_lock. |
103 // (b) If we're not at a safepoint, operations on the master | 160 // (b) If we're not at a safepoint, operations on the master |
104 // humongous set should be invoked while holding the Heap_lock. | 161 // humongous set should be invoked while holding the Heap_lock. |
105 | 162 |
106 guarantee((SafepointSynchronize::is_at_safepoint() && | 163 if (SafepointSynchronize::is_at_safepoint()) { |
107 (Thread::current()->is_VM_thread() || | 164 guarantee(Thread::current()->is_VM_thread() || |
108 OldSets_lock->owned_by_self())) || | 165 OldSets_lock->owned_by_self(), |
109 (!SafepointSynchronize::is_at_safepoint() && | 166 hrs_ext_msg(this, "master humongous set MT safety protocol " |
110 Heap_lock->owned_by_self()), | 167 "at a safepoint")); |
111 hrs_ext_msg(this, "master humongous set MT safety protocol")); | 168 } else { |
169 guarantee(Heap_lock->owned_by_self(), | |
170 hrs_ext_msg(this, "master humongous set MT safety protocol " | |
171 "outside a safepoint")); | |
172 } | |
173 | |
112 return HumongousRegionSet::check_mt_safety(); | 174 return HumongousRegionSet::check_mt_safety(); |
113 } | 175 } |