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Re: [PATCH 3/4] sched: introduce synchronized idle injection

From Morten Rasmussen <morten.rasmussen@arm.com>
Newsgroups linux.kernel
Subject Re: [PATCH 3/4] sched: introduce synchronized idle injection
Date 2015-11-18 17:10 +0100
Message-ID <qwdsZ-5eU-5@gated-at.bofh.it> (permalink)
References (5 earlier) <qwav7-2Zg-1@gated-at.bofh.it> <qwbAR-3W1-1@gated-at.bofh.it> <qwcnh-4gQ-35@gated-at.bofh.it> <qwcwW-4zt-13@gated-at.bofh.it> <qwcGD-4D5-27@gated-at.bofh.it>
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On Wed, Nov 18, 2015 at 07:11:31AM -0800, Jacob Pan wrote:
> On Wed, 18 Nov 2015 15:09:44 +0000
> Morten Rasmussen <morten.rasmussen@arm.com> wrote:
> 
> > Okay. But it does mean that the defeault idle period is 5 ticks (50ms
> > @ HZ=100) and not 5 ms
> correct. my reason is to scale with various HZ values.

50ms seems quite long for embedded applications. OTOH, it has to be long
enough to enter a package idle state and stay there for a while. You
would surely notice it when it kicks in on an Android device.

Do you intend to use it only as a last option? One might want to keep
using inefficient frequencies (P-states) if those don't cause UI lag
then.
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Thread

Re: [PATCH 3/4] sched: introduce synchronized idle injection Ingo Molnar <mingo@kernel.org> - 2015-11-18 09:40 +0100
  Re: [PATCH 3/4] sched: introduce synchronized idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-18 11:40 +0100
    Re: [PATCH 3/4] sched: introduce synchronized idle injection Morten Rasmussen <morten.rasmussen@arm.com> - 2015-11-18 13:30 +0100
      Re: [PATCH 3/4] sched: introduce synchronized idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-18 14:00 +0100
        Re: [PATCH 3/4] sched: introduce synchronized idle injection Morten Rasmussen <morten.rasmussen@arm.com> - 2015-11-18 15:10 +0100
          Re: [PATCH 3/4] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-18 16:00 +0100
            Re: [PATCH 3/4] sched: introduce synchronized idle injection Morten Rasmussen <morten.rasmussen@arm.com> - 2015-11-18 16:10 +0100
              Re: [PATCH 3/4] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-18 16:20 +0100
                Re: [PATCH 3/4] sched: introduce synchronized idle injection Thomas Gleixner <tglx@linutronix.de> - 2015-11-18 16:30 +0100
                Re: [PATCH 3/4] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-18 20:00 +0100
                Re: [PATCH 3/4] sched: introduce synchronized idle injection Morten Rasmussen <morten.rasmussen@arm.com> - 2015-11-18 17:10 +0100
    Re: [PATCH 3/4] sched: introduce synchronized idle injection Ingo Molnar <mingo@kernel.org> - 2015-11-27 10:20 +0100
  Re: [PATCH 3/4] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-18 15:20 +0100
    Re: [PATCH 3/4] sched: introduce synchronized idle injection Ingo Molnar <mingo@kernel.org> - 2015-11-27 10:20 +0100
  Re: [PATCH 3/4] sched: introduce synchronized idle injection Arjan van de Ven <arjan@linux.intel.com> - 2015-11-18 15:30 +0100

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