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Summary: GetActuallyAllocatedSize is actually expensive. In order to avoid calling this function in the malloc/free fast path, we change the Scudo chunk header to store the size of the chunk, if from the Primary, or the amount of unused bytes if from the Secondary. This way, we only have to call the culprit function for Secondary backed allocations (and still in realloc). The performance gain on a singly threaded pure malloc/free benchmark exercising the Primary allocator is above 5%. Reviewers: alekseyshl, kcc, dvyukov Reviewed By: dvyukov Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D32299 llvm-svn: 300861