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Speaker
Friday, January 31, 2025 - 12:20 to 13:10
Gates 114, Bloomberg 201 & Streaming via Zoom
Host:
Hakim Weatherspoon
Categories:
Title: Towards Swap-Free, Continuous Ballooning for Fast, Cloud-Based Virtual Machine Migrations
Abstract: Ballooning is one technique for modifying the size of a virtual machine and has been used to speed up VM migration and increase VM consolidation. However, it has a significant risk: the ominous out-of-memory (OOM) error. The issue is that it is infeasible to use ballooning during high-risk scenarios, namely during giant memory spikes and during live migration, for fear of swapping or worse, OOM errors.
We advance the state of the art by optimizing the Linux balloon driver for VM migration in a non-overcommitted context, resulting in being able to handle both high-risk scenarios without relying on swapping and without causing OOM errors. We add a user-space continuous ballooning program that, in tandem with our balloon driver modifications, can handle memory spikes of hundreds of gigabytes, as well as survive an indefinite number of migrations.
Bio: Kevin Alarcón Negy is a PhD student at Cornell University, advised by Adrian Sampson. His research interests encompass operating systems, virtualization, cloud computing, and computer architecture. He previously worked in the field of cryptocurrencies. He will be joining Princeton as a Lecturer this Fall 2025.