Re: Sched_autogroup and niced processes

[Ingo Molnar]

* Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:

> On Fri, 2011-05-13 at 11:05 +0200, Ingo Molnar wrote:
> > Could we somehow automate this:
> > 
> >   > echo 19 > /proc/'pid of seti@home'/autogroup
> > 
> > and split off nice 19 tasks into separate groups and lower the group's 
> > priority? 
> 
> Well I guess you can stack on all kinds of heuristics, do we want to?

Well have you seen my non-heuristic suggestion:

 | Another thing we could do is to lower the priority of a cgroup if it *only* 
 | runs reniced tasks. I.e. track the 'maximum priority' of cgroups and 
 | propagate that to their weight.
 |
 | This way renicing within cgroups will be more powerful and people do not have 
 | to muck with cgroup details.

A cgroup assuming the highest priority of all tasks it contains is a pretty 
natural definition and extension of priorities and also solves this usecase.

Thanks,

	Ingo
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