On Tue, 2012-02-28 at 16:54 -0500, Vivek Goyal wrote:

On Tue, Feb 28, 2012 at 10:43:54PM +0100, Peter Zijlstra wrote:

quoted

On Tue, 2012-02-28 at 16:35 -0500, Vivek Goyal wrote:

quoted

For
cpu controller, it is priority at the group level no fixed minimum/maximum
% shares. And that's a limitation of treating task and group at same level.

Depends on what you mean by min/max %, you can do it on the group level
by using bandwidth caps (for max) or inverted (max on everybody else,
for min).

I was referring to using pure proportional controller. max bandwidth is
new and I am looking for a quick documentation file which describes
what are the knobs and how to use it. Did not find any in
Documentation/cgroups/. Is there any documentation available?

Its written in C, its at kernel/sched/fair.c ;-)

I am assuming that max are being specified for groups in some absolute
quantity. That is fine. It will not still be max %, as again for % you
need fixed number of entities at any level and that's not the case with
tasks.

Minimum for one group (max for everyone else) will also only work if 
task and groups are not at same level.

I'm really not seeing this.

I think the only way to get fixed % share is not to put task and group
at same level during system configuration.

Still doesn't matter, like said, its all runnable based. If a group has
0 runnable entities it doesn't exist (more or less).