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8252513: ZGC: Contiguous memory reservation probing is broken for TB heap sizes

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Reviewed-by: eosterlund, pliden
This commit is contained in:
Stefan Karlsson 2020-09-02 11:13:09 +02:00
parent 553f3b1497
commit ac2b1ae5e2
1 changed files with 3 additions and 3 deletions
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6
src/hotspot/share/gc/z/zVirtualMemory.cpp
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@ -101,10 +101,10 @@ size_t ZVirtualMemoryManager::reserve_discontiguous(size_t size) {
bool ZVirtualMemoryManager::reserve_contiguous(size_t size) {
// Allow at most 8192 attempts spread evenly across [0, ZAddressOffsetMax)
const size_t end = ZAddressOffsetMax - size;
const size_t increment = align_up(end / 8192, ZGranuleSize);
const size_t unused = ZAddressOffsetMax - size;
const size_t increment = MAX2(align_up(unused / 8192, ZGranuleSize), ZGranuleSize);
for (size_t start = 0; start <= end; start += increment) {
for (size_t start = 0; start + size <= ZAddressOffsetMax; start += increment) {
if (reserve_contiguous_platform(start, size)) {
// Make the address range free
_manager.free(start, size);