Re: Containers - what are they?

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Peter Teoh wrote:
> I read this:
> 
> http://lwn.net/Articles/236078/
> 
> But still don't understand what is containers?   what is the rational
> behind the concept?   Which applications is it useful?
> 

It renamed to cgroup before merging into mainline, and cgroup stands for control
group. Cgroup provides a mechanism to divide all the processes into groups, and
then a cgroup subsystem can act on groups rather than on threads.

The first cgroup subsystem is cpuset which assigns a set of cpus and memory nodes
to a set of processes. In fact the auther of cgroup extracted the mechanism of
dividing and aggregating tasks from cpuset and made it cgroup.

> What is the current status of development?
> 

Cgroup is still under development. And we have cpuset, cpu, cpuacct, memory and
device subsystems, besides these we have memrlimit subsys in -mm and other subsystems
like swap subsys under development.

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