Update cgroup

[laijs]

No description provided.

[laijs]

@jonboulle @wking the last commit of #128 is updated and moved here
conflicted with the ummerged #99 from @wking.

[wking]

On Mon, Aug 31, 2015 at 07:24:33AM -0700, Lai Jiangshan wrote:

• rename the "Control groups" to "Resources" and update the description

“Control groups” are a Linux feature I'd heard of before runC.
“Resources” could be anything. If we really do step outside of
cgroups here, I'm ok with a structure like:

Resource

Limit the resources that can be used by your container. Bla bla
bla…

Control groups

Bla bla bla…

You can also setup device cgroups via
devices.

Other resource limit that's not covered by control groups

Bla bla bla…

Although with #99, I've proposed shifting the device-cgroup setup into
the cgroups structure, so it's not squashed in with mknod control.

[wking]

On Mon, Aug 31, 2015 at 07:27:47AM -0700, Lai Jiangshan wrote:

the last commit of #128 is updated and moved here conflicted with
the ummerged #99 from @wking.

I like #99, but I wouldn't worry about conflicts with it in other pull
requests until it attracts more interest ;). So far it's been almost
a month with no non-me comments, so blocking anything else on #99 will
probably just kill the blocked thing :p.

[wking]

This change will conflict with #137 (although I like where they're both going, so this is just a heads up that someone may have to rebase ;).

[laijs]

a example is added by another pr, close it