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COOPERATIVE LINUX

Prepared By:

PRERNA KHARBANDA11082235

INFORMATION TECHNOLOGY

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Introduction

Cooperative Linux utilizes the underused concept of aCooperative Virtual Machine (CVM), in contrast totraditional VMs that are unprivileged and being under thecomplete control of the host machine.

The term Cooperative is used to describe two entitiesworking in parallel.

In that sense the most plain description of CooperativeLinux is turning two operating system kernels into two bigcoroutines. In that Mode, each kernel has its own complete

CPU context and address space, and each kernel decideswhen to give control back to its partner.

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HISTORY

Dan Aloni originally started thedevelopment of Cooperative Linux basedon similar work with User-mode Linux andLINE.

He open sourced the software under theGNU General Public License.

Other developers have since contributedvarious patches and additions to thesoftware.

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coLinux

Allows the Linux kernel to run natively. As a Windows device driver.

No bridge between the host kernel and the guestkernel. Guest can run at near native speeds.

Allocate memory only for kernel and its forkedprocesses.

Windows service for guest OS startup.

Requires manual configuration.

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Windows Monitoring Service

Monitors CPU load and coLinux load.

Monitors Keyboard/Mouse idle time.

Makes this information available tocoLinux.

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coLinux Networking

Bridged Networking

Uses WinPcap.

Advantage: Simple setup.

Disadvantage: Requires a real IP. NAT

Uses a TAP-Win32 networking device.

Windows performs the NAT.

coLinux does not have a real IP.

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coLinux Networking

All coLinux installs have the same local IP

e.g 192.168.0.40.

How to identify nodes in a large install? Change MAC address of TAP-Win32 device to

contain real hosts IP. E.g. 00:11:81:5D:44:04

on host 129.93.68.4.

Set hostname on coLinux based on MAC

address. E.g. node-68-4 on 129.93.68.4.

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Automation of Installs

gen_xml.exe

Determines the name of the required real network adapter.

Generates MAC address for virtual network device based on

hosts IP. Writes coLinuxs XML file.

Can perform complete install by popping in an install CD.

Template of this CD will be made available.

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USES

Relatively effortless migration path from

Windows.

Adding Windows machines to Linux clusters. Running an otherwise-dual-booted Linux system

from the other OS.

Using Linux as a Windows firewall on the same

machine.

Linux kernel development / debugging / research

and study on another operating systems.

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FEATURES

SUSPENSION

On User Mode Linux suspending is easier only the state of a few processesneeds saving, and no hardware is involved.

USER MODE LINUX INSIDE COOPERATIVE LINUX

Combining UML and Cooperative Linux cancels the security downside thatrunning Cooperative Linux could incur.

LIVE COOPERATIVE DISTRIBUTIONS

Live-CD distributions can be used to boot on top of another operating system

INTEGRATION WITH REACTOS

ReactOS, the free Windows NT clone, will be incorporating Cooperative

Linux as a POSIX subsystem. MISCELLANEOUS

Virtual frame buffer support.

Incorporating features from User Mode Linux, e.g. humfs 3.

Support for more host operating systems

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CURRENT STATUS

Version: 0.6.4

Released on date:July 02, 2006

Supported architectures: o Intel-compatible 386 and above Supported operating

systems:

? Windows 2000

? Windows XP ? Linux 2.6.x

Supported guest Linux kernel versions: o 2.6.11

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DISADVANTAGES

The biggest disadvantage is that coLinux runs aside theWindows kernel.

Inside this CPU abstraction layer, there is no hardware

memory protection. This is the same situation as betweenthe Linux or Windows kernel and their device drivers.

To load and use coLinux the user has to have administratorrights.

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Performance

Platform Time (min:sec)

Native Linux 39:23

coLinux 39:26

VMWare 40:53

POV-Ray execution time

Source: Build a heterogeneous cluster with coLinux and

openMosix - IBM developerWorks

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CONCLUSION

The coLinux is an economical and efficient

possibility to program embedded Linux

systems directly from a Windows PC. Cooperative Linux has the potential to

become an alternative to User Mode Linux

that enhances on portability andperformance, rather than on security.

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Thank You