Mercurial > hg > truffle
comparison src/share/vm/gc_interface/collectedHeap.cpp @ 3892:baf763f388e6
7059037: Use BIS for zeroing on T4
Summary: Use BIS for zeroing new allocated big (2Kb and more) objects and arrays.
Reviewed-by: never, twisti, ysr
| author | kvn |
|---|---|
| date | Fri, 26 Aug 2011 08:52:22 -0700 |
| parents | 1d1603768966 |
| children | d968f546734e |
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| 3891:ac8738449b6f | 3892:baf763f388e6 |
|---|---|
| 155 } | 155 } |
| 156 if (ZeroTLAB) { | 156 if (ZeroTLAB) { |
| 157 // ..and clear it. | 157 // ..and clear it. |
| 158 Copy::zero_to_words(obj, new_tlab_size); | 158 Copy::zero_to_words(obj, new_tlab_size); |
| 159 } else { | 159 } else { |
| 160 // ...and clear just the allocated object. | 160 // ...and zap just allocated object. |
| 161 Copy::zero_to_words(obj, size); | 161 #ifdef ASSERT |
| 162 // Skip mangling the space corresponding to the object header to | |
| 163 // ensure that the returned space is not considered parsable by | |
| 164 // any concurrent GC thread. | |
| 165 size_t hdr_size = oopDesc::header_size(); | |
| 166 Copy::fill_to_words(obj + hdr_size, new_tlab_size - hdr_size, badHeapWordVal); | |
| 167 #endif // ASSERT | |
| 162 } | 168 } |
| 163 thread->tlab().fill(obj, obj + size, new_tlab_size); | 169 thread->tlab().fill(obj, obj + size, new_tlab_size); |
| 164 return obj; | 170 return obj; |
| 165 } | 171 } |
| 166 | 172 |