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comparison src/share/vm/memory/universe.cpp @ 1571:2d127394260e

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6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb Summary: Added new product ObjectAlignmentInBytes flag to control object alignment. Reviewed-by: twisti, ysr, iveresov
author kvn
date Thu, 27 May 2010 18:01:56 -0700
parents cd5dbf694d45
children e9ff18c4ace7
comparison
equal deleted inserted replaced
1570:de91a2f25c7e 1571:2d127394260e
746 // HeapBased - Use compressed oops with heap base + encoding. 746 // HeapBased - Use compressed oops with heap base + encoding.
747 747
748 // 4Gb 748 // 4Gb
749 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); 749 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1);
750 // 32Gb 750 // 32Gb
751 static const uint64_t OopEncodingHeapMax = NarrowOopHeapMax << LogMinObjAlignmentInBytes; 751 // OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes;
752 752
753 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) { 753 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) {
754 size_t base = 0; 754 size_t base = 0;
755 #ifdef _LP64 755 #ifdef _LP64
756 if (UseCompressedOops) { 756 if (UseCompressedOops) {
1259 HeapWord* high_boundary) { 1259 HeapWord* high_boundary) {
1260 assert(low_boundary < high_boundary, "bad interval"); 1260 assert(low_boundary < high_boundary, "bad interval");
1261 1261
1262 // decide which low-order bits we require to be clear: 1262 // decide which low-order bits we require to be clear:
1263 size_t alignSize = MinObjAlignmentInBytes; 1263 size_t alignSize = MinObjAlignmentInBytes;
1264 size_t min_object_size = oopDesc::header_size(); 1264 size_t min_object_size = CollectedHeap::min_fill_size();
1265 1265
1266 // make an inclusive limit: 1266 // make an inclusive limit:
1267 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1267 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1268 uintptr_t min = (uintptr_t)low_boundary; 1268 uintptr_t min = (uintptr_t)low_boundary;
1269 assert(min < max, "bad interval"); 1269 assert(min < max, "bad interval");