Huge Pages for Virtual-Memory Objects

Typ der Arbeit: Bachelorarbeit
Status der Arbeit: abgeschlossen
Projekte: ParPerOS
Betreuer: Alexander Halbuer, Daniel Lohmann
Bearbeiter: Marko Bolowski
Ende der Arbeit: 18. Mar 2024

With Morsels we introduced a novel new memory-management paradigm, that shifts from the management of individual pages to larger virtual-memory objects, technically represented as subtrees of the page-table hierarchy. This reduces management overhead and enables very fast transfer between address spaces. Currently, Morsels only support 4-KiB pages, but with larger page sizes the management overhead could be further reduced and the average memory access could be sped up, due to faster page-table walks and an increased TLB coverage. Besides 4-KiB pages, the AMD64 architecture also supports 2-MiB and sometimes 1-GiB pages. In the first step we need an interface that allows explicit control over the used pages sizes. In the future this mechanism should be extended to automatically choose the best page size for an use case. As one evaluation target we can use the interference of a large language model (LLM) that requires large amounts of read-only data to be accessible.

Topics: Linux kernel, C, Virtual Memory, Huge Pages

IOMMU-assisted Memory Management: Sharing Virtual Memory Objects for Efficient Computing

Efficient Memory Management for Modern Computing Systems: Sharing Morsel Virtual Memory Objects between Processors and Devices via IOMMU.

Typ: Masterarbeit
Status: abgeschlossen
Supervisors: Alexander Halbuer
Daniel Lohmann
Project: ParPerOS
Bearbeiter: Kenny Albes (abgegeben: 05. Dec 2023)

Efficient Serialization of Page-Table-Based Virtual Memory Objects

With the discontinuation of Intel Optane and persistent memory being rarely available in general, alternative solutions need to be considered. One approach is to persist virtual memory objects on disk when persistent memory is not available.

Typ: Bachelorarbeit
Status: abgeschlossen
Supervisors: Alexander Halbuer
Daniel Lohmann
Project: ParPerOS

Databases on NVRAM

Bringing the advantages of non-volatile memory to database applications using the new morsel memory primitive as efficient abstraction layer.

Typ: Bachelorarbeit
Status: abgeschlossen
Supervisors: Alexander Halbuer
Daniel Lohmann
Project: ParPerOS
Bearbeiter: Matthias Wormann (abgegeben: 02. Oct 2023)

Morsel Managment Layer: Making Morsels Actually Useful

Bringing the new morsel memory abstraction to applications.

Typ: Masterarbeit
Status: abgeschlossen
Supervisors: Alexander Halbuer
Daniel Lohmann
Project: ParPerOS
Bearbeiter: Darian Biastoch (abgegeben: 26. Oct 2023)

Self-Contained Virtual-Memory Areas for Non-Volatile RAM in the Linux Kernel

Implement the basic abstraction for self-contained virtual-address-space areas in Linux, by which we want to ease the allocation, the sharing, and the management of huge amounts of memory. [PDF]

Typ: Masterarbeit
Status: abgeschlossen
Supervisors: Lars Wrenger
Florian Rommel
Christian Dietrich
Daniel Lohmann
Project: ParPerOS
Bearbeiter: Alexander Halbuer (abgegeben: 16. Nov 2022)