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6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb

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Added new product ObjectAlignmentInBytes flag to control object alignment.

Reviewed-by: twisti, ysr, iveresov
This commit is contained in:
Vladimir Kozlov 2010-05-27 18:01:56 -07:00
parent 05b4f2e796
commit cc18a50e59
29 changed files with 222 additions and 136 deletions
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4
hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
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@ -159,7 +159,7 @@ ConcurrentMarkSweepGeneration::ConcurrentMarkSweepGeneration(
CardTableRS* ct, bool use_adaptive_freelists,
FreeBlockDictionary::DictionaryChoice dictionaryChoice) :
CardGeneration(rs, initial_byte_size, level, ct),
_dilatation_factor(((double)MinChunkSize)/((double)(oopDesc::header_size()))),
_dilatation_factor(((double)MinChunkSize)/((double)(CollectedHeap::min_fill_size()))),
_debug_collection_type(Concurrent_collection_type)
{
HeapWord* bottom = (HeapWord*) _virtual_space.low();
@ -222,7 +222,7 @@ ConcurrentMarkSweepGeneration::ConcurrentMarkSweepGeneration(
// promoting generation, we'll instead just use the mimimum
// object size (which today is a header's worth of space);
// note that all arithmetic is in units of HeapWords.
assert(MinChunkSize >= oopDesc::header_size(), "just checking");
assert(MinChunkSize >= CollectedHeap::min_fill_size(), "just checking");
assert(_dilatation_factor >= 1.0, "from previous assert");
}