Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/oops/markOop.hpp
src/share/vm/oops/markOop.hpp
- changeset 2497
- 3582bf76420e
- parent 2314
- f95d63e2154a
- child 2708
- 1d1603768966
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| 2496:27e4ea99855d | 2497:3582bf76420e |
|---|---|
| 116 cms_bits = LP64_ONLY(1) NOT_LP64(0), | 116 cms_bits = LP64_ONLY(1) NOT_LP64(0), |
| 117 epoch_bits = 2 | 117 epoch_bits = 2 |
| 118 }; | 118 }; |
| 119 | 119 |
| 120 // The biased locking code currently requires that the age bits be | 120 // The biased locking code currently requires that the age bits be |
| 121 // contiguous to the lock bits. Class data sharing would prefer the | 121 // contiguous to the lock bits. |
| 122 // hash bits to be lower down to provide more random hash codes for | |
| 123 // shared read-only symbolOop objects, because these objects' mark | |
| 124 // words are set to their own address with marked_value in the lock | |
| 125 // bit, and using lower bits would make their identity hash values | |
| 126 // more random. However, the performance decision was made in favor | |
| 127 // of the biased locking code. | |
| 128 | |
| 129 enum { lock_shift = 0, | 122 enum { lock_shift = 0, |
| 130 biased_lock_shift = lock_bits, | 123 biased_lock_shift = lock_bits, |
| 131 age_shift = lock_bits + biased_lock_bits, | 124 age_shift = lock_bits + biased_lock_bits, |
| 132 cms_shift = age_shift + age_bits, | 125 cms_shift = age_shift + age_bits, |
| 133 hash_shift = cms_shift + cms_bits, | 126 hash_shift = cms_shift + cms_bits, |
