Re: [PATCH 0/9] CPU controller

[MAEDA Naoaki <maeda.naoaki@jp.fujitsu.com>]

On Fri, 28 Apr 2006 08:59:49 +0200
Mike Galbraith <efault@gmx.de> wrote:

> On Fri, 2006-04-28 at 14:48 +0900, MAEDA Naoaki wrote:
> > Hi Mike,
> > 
> > On Fri, 28 Apr 2006 07:25:35 +0200
> > Mike Galbraith <efault@gmx.de> wrote:
> > 
> > > On Fri, 2006-04-28 at 10:37 +0900, MAEDA Naoaki wrote:
> > > > Andrew,
> > > > 
> > > > This patchset adds a CPU resource controller on top of Resource Groups. 
> > > > The CPU resource controller manages CPU resources by scaling timeslice
> > > > allocated for each task without changing the algorithm of the O(1)
> > > > scheduler.
> > > > 
> > > > Please consider these for inclusion in -mm tree.
> > > 
> > > This patch set professes to be a resource controller, yet 100% of high
> > > priority tasks are uncontrolled.  Distribution of CPU among high
> > > priority tasks isn't important, but distribution of what they leave
> > > behind is?
> > 
> > Do you mean niced tasks are uncontrolled by the controller? 
> > TASK_INTERACTIVEs are left untouched intentionally, but niced tasks
> > are also controlled.
> 
> Until they attain interactive status.  Note that attaining this status
> requires only one sleep, and once attained, it can be sustained.  I
> don't know what the current exact numbers are, but until recently, the
> numbers were that once sleep_avg became full, a non-niced task could
> sustain ~95% cpu indefinitely.
> 
> You simply cannot ignore interactive tasks.  At the very least, you have
> to disallow requeue if the resource limit has been exceeded, otherwise,
> this patch set is non-functional.

It can be easily implemented on top of the current code. Do you know a good
sample program that is judged as interactive but consumes lots of cpu?

Thanks,
MAEDA Naoaki


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