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Type:
Enhancement
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Resolution: Fixed
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Priority:
P5
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Affects Version/s: hs17
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Component/s: hotspot
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b03
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sparc
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solaris_10
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Verified
| Issue | Fix Version | Assignee | Priority | Status | Resolution | Resolved In Build |
|---|---|---|---|---|---|---|
| JDK-2195070 | 7 | Vladimir Kozlov | P5 | Closed | Fixed | b99 |
| JDK-2197872 | 6u23 | Vladimir Kozlov | P5 | Resolved | Fixed | b01 |
| JDK-2199772 | 6u22m | Vladimir Kozlov | P5 | Resolved | Fixed | b01 |
| JDK-2197578 | 6u21p | Vladimir Kozlov | P5 | Resolved | Fixed | b03 |
Whenever we decide to use Compressed Oops with 64Gb heap AT LEAST next changes should be made to build VM which support it.
Note: more complex changes needed to use a VM option. I don't see benefits on N2 with it so I am putting it on shelf.
src/share/vm/utilities/globalDefinitions.hpp
@@ -288,11 +288,11
// Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
// reference fields can be naturally aligned.
-const int MinObjAlignment = HeapWordsPerLong;
+const int MinObjAlignment = HeapWordsPerLong * 2; // *2 for 16 bytes alignment
const int MinObjAlignmentInBytes = MinObjAlignment * HeapWordSize;
const int MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
-const int LogMinObjAlignment = LogHeapWordsPerLong;
+const int LogMinObjAlignment = LogHeapWordsPerLong + 1; // +1 for 16 bytes alignment
const int LogMinObjAlignmentInBytes = LogMinObjAlignment + LogHeapWordSize;
Note: more complex changes needed to use a VM option. I don't see benefits on N2 with it so I am putting it on shelf.
src/share/vm/utilities/globalDefinitions.hpp
@@ -288,11 +288,11
// Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
// reference fields can be naturally aligned.
-const int MinObjAlignment = HeapWordsPerLong;
+const int MinObjAlignment = HeapWordsPerLong * 2; // *2 for 16 bytes alignment
const int MinObjAlignmentInBytes = MinObjAlignment * HeapWordSize;
const int MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
-const int LogMinObjAlignment = LogHeapWordsPerLong;
+const int LogMinObjAlignment = LogHeapWordsPerLong + 1; // +1 for 16 bytes alignment
const int LogMinObjAlignmentInBytes = LogMinObjAlignment + LogHeapWordSize;
- backported by
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JDK-2197578 Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb
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- Resolved
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- Resolved
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- Resolved
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- Closed
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- relates to
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JDK-6957882 nsk/sajdi tests failed with NullPointerException
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- Closed
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- Closed
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(1 relates to)