Re: [RFC PATCH 0/3] CFS idle injection

From	Juri Lelli <juri.lelli@arm.com>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH 0/3] CFS idle injection
Date	2015-11-10 12:00 +0100
Message-ID	<qteOC-3Za-17@gated-at.bofh.it> (permalink)
References	(5 earlier) <qrWh4-13l-15@gated-at.bofh.it> <qsTh8-5UJ-17@gated-at.bofh.it> <qsVsC-7v9-3@gated-at.bofh.it> <qte2e-3Ga-19@gated-at.bofh.it> <qtevg-3RD-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On 11/10/15, Peter Zijlstra wrote:
> On Tue, Nov 10, 2015 at 10:07:35AM +0000, Juri Lelli wrote:
> > Do you think that using SCHED_DEADLINE here would be completely
> > foolish? I mean, we would have the duty_cycle/period thing for free, it
> > would be know to the scheduler (as to maybe address Thomas' concerns)
> > and we could think to make idle injection part of system analysis (for
> > the soft-RT use cases).
> 
> DEADLINE would be awesome, but I think we need work on two fronts before
> we can really sell it as the awesome that it is ;-)
> 
>  - greedy and or statistical bounds
>  - !priv
> 
> The first is such that we can better deal with the erratic nature of
> media decode without going full worst case on it, and the second just
> makes it so much more accessible.
> 

Right. For the first point I think we just need to make our off-line
calculation right, not that we need to modify implementation. On the
second point we need more work yes. Also, another thing that is missing
is frequency (uarch) scaling for reservations parameters, something alike
what we are doing for CFS; this last point might be solved sooner :-).

Thanks,

- Juri

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Thread

[RFC PATCH 0/3] CFS idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-03 01:20 +0100
  [RFC PATCH 3/3] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-03 01:20 +0100
    Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-03 14:40 +0100
      Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-03 15:20 +0100
      Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-03 17:50 +0100
        Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-05 11:20 +0100
          Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Arjan van de Ven <arjan@linux.intel.com> - 2015-11-05 15:30 +0100
            Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-05 15:40 +0100
              Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-05 15:50 +0100
              Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Arjan van de Ven <arjan@linux.intel.com> - 2015-11-05 16:30 +0100
                Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-05 18:00 +0100
                Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Thomas Gleixner <tglx@linutronix.de> - 2015-11-05 20:00 +0100
                Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Thomas Gleixner <tglx@linutronix.de> - 2015-11-05 19:50 +0100
              Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-05 16:40 +0100
                Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Arjan van de Ven <arjan@linux.intel.com> - 2015-11-05 17:10 +0100
          Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-05 20:30 +0100
            Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-05 20:40 +0100
      Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-05 15:10 +0100
        Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-06 00:50 +0100
          Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-06 08:50 +0100
            Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-07 01:00 +0100
              Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-10 01:30 +0100
  [RFC PATCH 2/3] timer: relax tick stop in idle entry Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-03 01:20 +0100
  Re: [RFC PATCH 0/3] CFS idle injection Eduardo Valentin <edubezval@gmail.com> - 2015-11-04 07:10 +0100
    Re: [RFC PATCH 0/3] CFS idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-04 18:00 +0100
      Re: [RFC PATCH 0/3] CFS idle injection Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2015-11-04 18:10 +0100
        Re: [RFC PATCH 0/3] CFS idle injection Eduardo Valentin <edubezval@gmail.com> - 2015-11-04 19:50 +0100
      Re: [RFC PATCH 0/3] CFS idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-05 11:20 +0100
        Re: [RFC PATCH 0/3] CFS idle injection Punit Agrawal <punit.agrawal@arm.com> - 2015-11-06 18:00 +0100
          Re: [RFC PATCH 0/3] CFS idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-06 22:00 +0100
            Re: [RFC PATCH 0/3] CFS idle injection Punit Agrawal <punit.agrawal@arm.com> - 2015-11-09 13:00 +0100
              Re: [RFC PATCH 0/3] CFS idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-09 15:20 +0100
                Re: [RFC PATCH 0/3] CFS idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-09 15:50 +0100
                Re: [RFC PATCH 0/3] CFS idle injection Juri Lelli <juri.lelli@gmail.com> - 2015-11-10 11:10 +0100
                Re: [RFC PATCH 0/3] CFS idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-10 11:40 +0100
                Re: [RFC PATCH 0/3] CFS idle injection Juri Lelli <juri.lelli@arm.com> - 2015-11-10 12:00 +0100
              Re: [RFC PATCH 0/3] CFS idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-09 15:40 +0100
        Re: [RFC PATCH 0/3] CFS idle injection Dietmar Eggemann <dietmar.eggemann@arm.com> - 2015-11-06 19:40 +0100
          Re: [RFC PATCH 0/3] CFS idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-06 20:20 +0100
            Re: [RFC PATCH 0/3] CFS idle injection Dietmar Eggemann <dietmar.eggemann@arm.com> - 2015-11-06 23:00 +0100
              Re: [RFC PATCH 0/3] CFS idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-09 22:30 +0100
                Re: [RFC PATCH 0/3] CFS idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-09 22:50 +0100

csiph-web