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检索条件"主题词=Page Modification Logging"

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A Review of Implementation Methods for Memory Access Monitoring 3

A Review of Implementation Methods for Memory Access Monitor...

引用

3rd International Conference on Artificial Intelligence and Computer Information Technology, AICIT 2024

作者： Fang, Yutian Li, Jiaxin College of Computer National University of Defense Technology Changsha China

ISBN: (纸本)9798350365443

Memory access monitoring is widely used in architecture and system research, and plays an important role in program profiling, memory safety and memory system design. Existing software instrumentation techniques for byte-grained memory access monitoring have several limitations. Compiler instrumentation cannot apply to closed-source or legacy code. Static binary instrumentation is typically characterized as best-effort, which makes optimistic assumptions about its target binary. Dynamic binary instrumentation incurs prohibitive-high runtime overhead, making it unsuitable for large-scale applications. Meanwhile, existing hardware features for memory access monitoring in commodity processors offer limited granularity. They typically track memory access at the page granularity or provide imprecise sampling, not the desired byte-grained level. © 2024 IEEE.

关键词： instrumentation memory access monitoring Memory Protection Keys page modification logging page protection Precise Event-Based Sampling

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Out of Hypervisor (OoH): Efficient Dirty page Tracking in Userspace Using Hardware Virtualization Features

Out of Hypervisor (OoH): Efficient Dirty Page Tracking in Us...

引用

International Conference for High Performance Computing, Networking, Storage and Analysis (HPC)

作者： Bitchebe, Stella Tchana, Alain Univ Cote Dazur Nice France ENS Lyon Lyon France

ISBN: (纸本)9781665454445

This paper introduces Out of Hypervisor (OoH), a new virtualization research axis. Instead of emulating full virtual hardware inside a VM to support a hypervisor, the OoH principle is to individually expose current hypervisor-oriented hardware virtualization features to the guest OS. This way, guest's processes could also take benefit from those features. We illustrate OoH with Intel PML (page modification logging), a feature that allows efficient dirty page tracking to improve VM live migration. Because dirty page tracking is at the heart of many essential tasks including process checkpointing (e.g., CRIU) and concurrent garbage collection (e.g, Boehm GC), OoH exposes PML to accelerate these tasks in the guest. We present two OoH solutions namely Shadow PML (SPML) and Extended PML (EPML) that we integrated into CRIU and Boehm GC. Evaluation results showed that EPML speeds up CRIU checkpointing by about 13 x and Boehm garbage collection by up to 6 x compared to SPML, /proc, and userfaultfd while reducing their overhead on monitored applications by about 16 x.

关键词： virtualization page modification logging check-pointing garbage collection

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Extending Intel PML for Hardware-Assisted Working Set Size Estimation of VMs 2021

Extending Intel PML for Hardware-Assisted Working Set Size E...

引用

17th ACM SIGPLAN/SIGOPS International Conference on Virtual Execution Environments (VEE)

作者： Bitchebe, Stella Mvondo, Djob Reveillere, Laurent de Palma, Noel Tchana, Alain Univ Cote dAzur Sophia Antipolis France Grenoble Alps Univ Grenoble France Univ Bordeaux Bordeaux France INRIA ENS Lyon Lyon France

ISBN: (纸本)9781450383943

Intel page modification logging (PML) is a hardware feature introduced in 2015 for tracking modified memory pages of virtual machines (VMs). Although initially designed to improve VMs checkpointing and live migration, we present in this paper how we can take advantage of this virtualization technology to efficiently estimate the working set size (WSS) of a VM. To this end, we first conduct a study of PML with the Xen hypervisor to investigate its performance impact on VMs and the accuracy of a WSS estimation system that relies on the current version of PML. Our three main findings are as follows. (1) PML reduces by up to 10.18% the time of both VM live migration and checkpointing. (2) PML slightly reduces the negative impact of live migration on application performance by up to 0.95%. (3) A WSS estimation system based on the current version of PML provides inaccurate results. Moreover, our experiments showthat write-intensive applications are negatively impacted, with up to 34.9% of performance degradation, when using PML to estimate the WSS of a VM that runs these applications. Based on the aforementioned findings, we introduce page reference logging (PRL), an extended version of PML that allows both read and write memory accesses to be tracked without impacting user VMs, thus more suitable for WSS estimation. We propose a WSS estimation system that leverages PRL and show how it can be used in a data center exploiting memory overcommitment. We implement PRL and the underlying WSS estimation system under Gem5, a popular open-source computer architecture simulator. Evaluation results validate the accuracy of the WSS estimation system and show that PRL does not incur more performance degradation on user's VMs.

关键词： Virtualization Virtualization Technology page modification logging Virtual Machine Control Structure Working Set Size

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Out of hypervisor (OoH): efficient dirty page tracking in userspace using hardware virtualization features 22

Out of hypervisor (OoH): efficient dirty page tracking in us...

引用

Proceedings of the International Conference on High Performance Computing, Networking, Storage and Analysis

作者： Stella Bitchebe Alain Tchana Univ. Côte d'Azur & ENS Lyon Nice & Lyon France ENS Lyon Lyon France

This paper introduces Out of Hypervisor (OoH), a new virtualization research axis. Instead of emulating full virtual hardware inside a VM to support a hypervisor, the OoH principle is to individually expose current hypervisor-oriented hardware virtualization features to the guest OS. This way, guest's processes could also take benefit from those features. We illustrate OoH with Intel PML (page modification logging), a feature that allows efficient dirty page tracking to improve VM live migration. Because dirty page tracking is at the heart of many essential tasks including process checkpointing (e.g., CRIU) and concurrent garbage collection (e.g, Boehm GC), OoH exposes PML to accelerate these tasks in the guest. We present two OoH solutions namely Shadow PML (SPML) and Extended PML (EPML) that we integrated into CRIU and Boehm GC. Evaluation results showed that EPML speeds up CRIU checkpointing by about 13× and Boehm garbage collection by up to 6× compared to SPML, /proc, and userfaultfd while reducing their overhead on monitored applications by about 16×.

关键词： page modification logging checkpointing virtualization garbage collection

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