Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp
src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp
- changeset 1629
- 34fb2662f6c2
- parent 1601
- 7b0e9cba0307
- child 1696
- 0414c1049f15
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| 1628:c81fa70144aa | 1629:34fb2662f6c2 |
|---|---|
| 1002 // of this implementation depends crucially on being able to | 1002 // of this implementation depends crucially on being able to |
| 1003 // answer very efficiently in constant time whether a piece of | 1003 // answer very efficiently in constant time whether a piece of |
| 1004 // storage in the heap comes from a young region or not. | 1004 // storage in the heap comes from a young region or not. |
| 1005 // See ReduceInitialCardMarks. | 1005 // See ReduceInitialCardMarks. |
| 1006 virtual bool can_elide_tlab_store_barriers() const { | 1006 virtual bool can_elide_tlab_store_barriers() const { |
| 1007 return true; | 1007 // 6920090: Temporarily disabled, because of lingering |
| 1008 // instabilities related to RICM with G1. In the | |
| 1009 // interim, the option ReduceInitialCardMarksForG1 | |
| 1010 // below is left solely as a debugging device at least | |
| 1011 // until 6920109 fixes the instabilities. | |
| 1012 return ReduceInitialCardMarksForG1; | |
| 1008 } | 1013 } |
| 1009 | 1014 |
| 1010 virtual bool card_mark_must_follow_store() const { | 1015 virtual bool card_mark_must_follow_store() const { |
| 1011 return true; | 1016 return true; |
| 1012 } | 1017 } |
| 1024 // G1 does not have any "young" objects, should not elide | 1029 // G1 does not have any "young" objects, should not elide |
| 1025 // the rs logging barrier and so should always answer false below. | 1030 // the rs logging barrier and so should always answer false below. |
| 1026 // However, non-generational G1 (-XX:-G1Gen) appears to have | 1031 // However, non-generational G1 (-XX:-G1Gen) appears to have |
| 1027 // bit-rotted so was not tested below. | 1032 // bit-rotted so was not tested below. |
| 1028 virtual bool can_elide_initializing_store_barrier(oop new_obj) { | 1033 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
| 1034 // Re 6920090, 6920109 above. | |
| 1035 assert(ReduceInitialCardMarksForG1, "Else cannot be here"); | |
| 1029 assert(G1Gen || !is_in_young(new_obj), | 1036 assert(G1Gen || !is_in_young(new_obj), |
| 1030 "Non-generational G1 should never return true below"); | 1037 "Non-generational G1 should never return true below"); |
| 1031 return is_in_young(new_obj); | 1038 return is_in_young(new_obj); |
| 1032 } | 1039 } |
| 1033 | 1040 |
