presto-main/src/main/java/io/prestosql/operator/WorkProcessorPipelineSourceOperator.java/WorkProcessorPipelineSourceOperator/updatePeakMemoryReservations
class WorkProcessorPipelineSourceOperator:        void updatePeakMemoryReservations()
        {
            long userMemory = memoryTrackingContext.getUserMemory();
            long systemMemory = memoryTrackingContext.getSystemMemory();
            long revocableMemory = memoryTrackingContext.getRevocableMemory();
            long totalMemory = userMemory + systemMemory;
            peakUserMemoryReservation.accumulateAndGet(userMemory, Math::max);
            peakSystemMemoryReservation.accumulateAndGet(systemMemory, Math::max);
            peakRevocableMemoryReservation.accumulateAndGet(revocableMemory, Math::max);
            peakTotalMemoryReservation.accumulateAndGet(totalMemory, Math::max);
        }