Progress Report2014/01/10

AgendaSummary of paper study

◦A Resource-Driven DVFS Scheme for Smart Handheld Devices, Dec. 2013.

Discuss the new direction ITRI wants on ARM.◦Energy-efficient big-LITTLE core

scheduling in ICL hypervisor (Xvisor)

A Resource-Driven DVFS Scheme for Smart Handheld DevicesPropose a resource-driven DVFS

scheme◦Model the resource usage patterns

using resource state machines in an online fashion to guide DVFS.

An example

State Transition

Evaluation(1)

Evaluation(2)

Evaluation(3)

Short SummaryRD-DVFS scheme

◦Model the resource usage patterns using resource state machines in an online fashion to guide DVFS.

Single core deviceUpdate state information during

state transition.Compare the power consumption

with Linux governor◦Performance, On-demand,

Conservative

Energy-efficient big-LITTLE core scheduling in ICL hypervisorIntegrate our power-aware

big.LITTLE scheduler design into ICL Hypervisor(Xvisor).◦Xvisor

An open-source type-1 hypervisor, which aims at providing a monolithic, light-weight, portable, and flexible virtualization solution.

Type-1:Complete monolithic

Virtual Machine IntrospectionMost of the researches on VM

Introspection are about detecting attacks or malware in VMs, not for scheduling.

Some VMI Related ToolsLibVMI

◦ Read and write arbitrary data from and to memory on VM.

◦ Works on both Xen and KVM.VIS

◦ collects dynamic information, i.e. system calls using "strace“

◦ Works only on KVM.VIX

◦ can maps some of guest VM's memory into the Dom0 system, acquires and decodes the memory pages’ relevant data, such as task_struct.

◦ task_struct is a data structure that stores or links to information such as the process ID, process name, memory map, and execution time.

◦ Works only on Xen.

Discussion