FelixYBW commented on code in PR #6554:
URL: https://github.com/apache/incubator-gluten/pull/6554#discussion_r1689028653
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cpp/core/memory/MemoryAllocator.cc:
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@@ -92,8 +92,17 @@ int64_t ListenableMemoryAllocator::peakBytes() const {
void ListenableMemoryAllocator::updateUsage(int64_t size) {
listener_->allocationChanged(size);
- usedBytes_.fetch_add(size);
- peakBytes_.store(std::max(peakBytes_.load(), usedBytes_.load()));
+ usedBytes_ += size;
+ while (true) {
+ int64_t savedPeakBytes = peakBytes_;
+ if (usedBytes_ <= savedPeakBytes) {
+ break;
+ }
+ // usedBytes_ > savedPeakBytes, update peak
+ if (peakBytes_.compare_exchange_weak(savedPeakBytes, usedBytes_)) {
+ break;
+ }
+ }
Review Comment:
With C++26 in future, we can use fetch_max directly.
https://en.cppreference.com/w/cpp/atomic/atomic/fetch_max
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