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Modern serverless platforms create function instances based on user-specified memory limits, which often result in memory over-provisioning even when the average runtime footprint is small. This over-provisioning reduces warm container density under a fixed memory budget, leading to early pool saturation, frequent evictions, and increased cold-start latency. To address this fundamental limitation, we propose Ditto, a system that integrates online memory rightsizing with value-aware container management. Ditto dynamically adjusts container memory to match actual usage, reclaiming unused memory while safely avoiding out-of-memory (OOM) conditions. In addition, it prioritizes containers based on their benefit per unit memory using a score-based eviction and keep-alive policy. We implement Ditto in Apache OpenWhisk and evaluate it across diverse workloads. Ditto reduces cold-start rate by up to 25.7% and latency by up to 33.3% compared to vanilla OpenWhisk, and by up to 14.8% and 19.4%, respectively, compared to RainbowCake.
