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Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature

From Clark Williams <williams@redhat.com>
Newsgroups linux.kernel
Subject Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature
Date 2016-11-07 20:00 +0100
Message-ID <sAXjc-74X-21@gated-at.bofh.it> (permalink)
References <sANjQ-mL-3@gated-at.bofh.it> <sAWQ9-6UY-7@gated-at.bofh.it> <sAWZQ-6Y4-23@gated-at.bofh.it>
Organization Red Hat, Inc

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On Mon, 7 Nov 2016 13:30:46 -0500
Steven Rostedt <rostedt@goodmis.org> wrote:

> On Mon, 7 Nov 2016 12:22:21 -0600
> Clark Williams <williams@redhat.com> wrote:
> 
> > I'm still reviewing the patch, but I have to wonder why bother with making it a scheduler feature?
> > 
> > The SCHED_FIFO definition allows a fifo thread to starve others
> > because a fifo task will run until it yields. Throttling was added as
> > a safety valve to allow starved SCHED_OTHER tasks to get some cpu
> > time.  Adding this unconditionally gets us a safety valve for
> > throttling a badly written fifo task, but allows the fifo task to
> > continue to consume cpu cycles if it's not starving anyone. 
> > 
> > Or am I missing something that's blazingly obvious?  
> 
> Or I say make it the default. If people want the old behavior, they can
> modify SCHED_FEATURES to do so.
> 

Ok, I can see wanting the previous behavior. 

Clark

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Thread

[PATCH] sched/rt: RT_RUNTIME_GREED sched feature Daniel Bristot de Oliveira <bristot@redhat.com> - 2016-11-07 09:20 +0100
  Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Tommaso Cucinotta <tommaso.cucinotta@sssup.it> - 2016-11-07 11:40 +0100
    Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Daniel Bristot de Oliveira <bristot@redhat.com> - 2016-11-07 15:00 +0100
      Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Tommaso Cucinotta <tommaso.cucinotta@sssup.it> - 2016-11-07 19:10 +0100
        Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Luca Abeni <luca.abeni@unitn.it> - 2016-11-07 19:30 +0100
      Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature luca abeni <lucabe72@gmail.com> - 2016-11-08 09:00 +0100
      Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Juri Lelli <juri.lelli@arm.com> - 2016-11-08 11:40 +0100
  Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Christoph Lameter <cl@linux.com> - 2016-11-07 18:00 +0100
    Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Steven Rostedt <rostedt@goodmis.org> - 2016-11-07 19:40 +0100
      Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Daniel Bristot de Oliveira <daniel@bristot.me> - 2016-11-07 19:50 +0100
        Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Steven Rostedt <rostedt@goodmis.org> - 2016-11-07 20:20 +0100
      Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Christoph Lameter <cl@linux.com> - 2016-11-07 20:40 +0100
        Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Christoph Lameter <cl@linux.com> - 2016-11-07 21:00 +0100
          Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Steven Rostedt <rostedt@goodmis.org> - 2016-11-07 21:10 +0100
            Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Daniel Bristot de Oliveira <daniel@bristot.me> - 2016-11-07 21:10 +0100
              Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Steven Rostedt <rostedt@goodmis.org> - 2016-11-07 21:20 +0100
                Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Daniel Bristot de Oliveira <daniel@bristot.me> - 2016-11-07 21:40 +0100
                Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Steven Rostedt <rostedt@goodmis.org> - 2016-11-07 21:50 +0100
                [PATCH] sched/rt: Change default setup for RT THROTTLING Daniel Bristot de Oliveira <daniel@bristot.me> - 2016-11-08 10:30 +0100
                Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Christoph Lameter <cl@linux.com> - 2016-11-09 00:50 +0100
        Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Steven Rostedt <rostedt@goodmis.org> - 2016-11-07 21:10 +0100
  Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Clark Williams <williams@redhat.com> - 2016-11-07 19:30 +0100
    Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Steven Rostedt <rostedt@goodmis.org> - 2016-11-07 19:40 +0100
      Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Daniel Bristot de Oliveira <daniel@bristot.me> - 2016-11-07 19:50 +0100
      Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Clark Williams <williams@redhat.com> - 2016-11-07 20:00 +0100
  Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Peter Zijlstra <peterz@infradead.org> - 2016-11-08 13:30 +0100
    Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Steven Rostedt <rostedt@goodmis.org> - 2016-11-08 15:10 +0100
      Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Peter Zijlstra <peterz@infradead.org> - 2016-11-08 18:00 +0100
        Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Steven Rostedt <rostedt@goodmis.org> - 2016-11-08 18:20 +0100
          Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Peter Zijlstra <peterz@infradead.org> - 2016-11-08 19:10 +0100
            Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Daniel Bristot de Oliveira <bristot@redhat.com> - 2016-11-08 20:40 +0100
              Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Peter Zijlstra <peterz@infradead.org> - 2016-11-08 21:00 +0100
                Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Daniel Bristot de Oliveira <bristot@redhat.com> - 2016-11-09 14:40 +0100
                Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature Christoph Lameter <cl@linux.com> - 2016-11-11 19:50 +0100

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