Re: Attempted summary of suspend-blockers LKML thread

From: Paul Menage
Date: Tue Aug 03 2010 - 00:38:21 EST

On Sun, Aug 1, 2010 at 11:53 PM, Florian Mickler <florian@xxxxxxxxxxx> wrote:
> Thinking about it.. I don't know much about cgroups, but I think a
> process can only be in one cgroup at a time.

A thread can only be in one cgroup in each hierarchy at one time. You
can mount multiple cgroups hierarchies, with different resource
controllers on different hierarchies.

> b) you can't use cgroup for other purposes anymore. I.e. if you want to
> have 2 groups that each only have half of the memory available, how
> would you then integrate the cgroup-ignore-for-idle-approach with this?

You could mount the subsystem that provides the "ignore-for-idle"
support on one hierarchy, and partition the trusted/untrusted
processes that way, and the memory controller subsystem on a different
hierarchy, with whatever split you wanted for memory controls.

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