Harvesting Idle Memory for Application-managed Soft State with Midas
Talkat 21st USENIX Symposium on Networked Systems Design and Implementation (NSDI '24) · 2024-04-16..04-18·
summary
Midas implements a new soft memory abstraction plus a userlinked runtime and minimal kernel coordinator to let applications place evictable objects in idle RAM and register per-object reconstructors. It uses a logstructured allocator and soft pointers that copy values to avoid raw page access, and supports kernel-enforced reclamation for urgent pressure. On a 20 GB collocated experiment with four apps Midas raises overall throughput 1.5× over static 5 GB shares, cuts memory needs by 71% versus overprovisioning, and survives an attacker allocating up to 7 GB/s by reclaiming and reconstructing pages within seconds.
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chapters (10)
- 0:00Midas and soft state intro
- 3:48Midas virtual memory abstraction
- 5:35Soft memory pointers
- 7:18Application eviction with Rong time
- 9:05Kernel reclamation for emergencies
- 10:53Preventing segmentation faults
- 11:34Global memory coordination
- 12:59Implementation and real-world applications
- 15:09Evaluating Midas under load
- 16:56Conclusion and open-source
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