JDK-8154838 : G1CardLiveData::free_large_bitmap() uses wrong calculation to determine the number of words
- Type: Enhancement
- Component: hotspot
- Sub-Component: gc
- Affected Version: 9
- Priority: P5
- Status: Resolved
- Resolution: Fixed
- Submitted: 2016-04-21
- Updated: 2016-05-26
- Resolved: 2016-04-22
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| JDK 9 |
|---|
9 b120Fixed  |
Related Reports
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Relates :
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Description
G1CardLiveData::bm_word_t* G1CardLiveData::allocate_large_bitmap(size_t size_in_bits) {
size_t size_in_words = BitMap::calc_size_in_words(size_in_bits);
bm_word_t* map = MmapArrayAllocator<bm_word_t, mtGC>::allocate(size_in_words);
return map;
}
void G1CardLiveData::free_large_bitmap(bm_word_t* bitmap, size_t size_in_bits) {
MmapArrayAllocator<bm_word_t, mtGC>::free(bitmap, size_in_bits / BitsPerWord);
}
The calculation of the number of elements in free_large_bitmap() is different to the one of allocate_large_bitmap().
The calculation itself is correct, as size_in_bits is always word aligned for all callers.