Groups > linux.kernel > #1320571

Re: [RFC 4/8] Improve the tracking of active utilisation

From	luca abeni <luca.abeni@unitn.it>
Newsgroups	linux.kernel
Subject	Re: [RFC 4/8] Improve the tracking of active utilisation
Date	2016-01-28 12:20 +0100
Message-ID	<qVSMi-2B1-27@gated-at.bofh.it> (permalink)
References	(2 earlier) <qQW4a-3gr-23@gated-at.bofh.it> <qSDA5-7Pd-13@gated-at.bofh.it> <qSEPw-8d-21@gated-at.bofh.it> <qVyue-49M-13@gated-at.bofh.it> <qVzqi-4RW-31@gated-at.bofh.it>
Organization	university of trento

Show all headers | View raw

Hi Peter,

On Wed, 27 Jan 2016 15:39:46 +0100
Peter Zijlstra <peterz@infradead.org> wrote:

> On Wed, Jan 27, 2016 at 02:36:51PM +0100, Luca Abeni wrote:
> > Ok, so I implemented this idea, and I am currently testing it...
> > The first experiments seem to show that there are no problems, but I
> > just tried some simple workload (rt-app, or some other periodic
> > taskset scheduled by SCHED_DEADLINE). Do you have suggestions for
> > more "interesting" (and meaningful) tests/experiments?
> 
> rt-app is the workload generator, right?
> 
> I think the most interesting part here is the switched_from path, so
> you'd want the workload to include a !rt task that gets PI boosted to
> deadline every so often.
I am looking at the PI stuff right now... And I am not sure if
SCHED_DEADLINE does the right thing for PI :)

Anyway, I think the total SCHED_DEADLINE utilization (rd->dl_bw) is
currently not changed when a SCHED_OTHER task is boosted to
SCHED_DEADLINE due to PI... Right? Is this the desired behaviour?
If yes, I'll make sure that my patch does not change it.



			Thanks,
				Luca

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Re: [RFC 4/8] Improve the tracking of active utilisation luca abeni <luca.abeni@unitn.it> - 2016-01-28 12:20 +0100
  Re: [RFC 4/8] Improve the tracking of active utilisation Peter Zijlstra <peterz@infradead.org> - 2016-01-28 13:30 +0100
    Re: [RFC 4/8] Improve the tracking of active utilisation luca abeni <luca.abeni@unitn.it> - 2016-01-28 14:50 +0100
      Re: [RFC 4/8] Improve the tracking of active utilisation Peter Zijlstra <peterz@infradead.org> - 2016-01-28 15:10 +0100
        Re: [RFC 4/8] Improve the tracking of active utilisation Luca Abeni <luca.abeni@unitn.it> - 2016-01-28 22:20 +0100

csiph-web