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

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On 11/18/2015 7:44 AM, Morten Rasmussen wrote:
> I would not necessarily want to punish all cpus
> system-wide if we have local overheating in one corner. If would rather
> have it apply to only the overheating socket in a multi-socket machine
> and only the big cores in a big.LITTLE system.

most of the time thermal issues aren't inside the SOC, but on a system level
due to cheap heat spreaders or outright lack of space due to thinness. But
even if you have one part of the die too hot:

For core level idle injection, no need to synchronize that; the reason to synchronize
is generally that when ALL cores are idle, additional power savings kick in
(like memory going to self refresh, fabrics power gating etc); those additional
power savings are what makes this more efficient than just voltage/frequency
scaling at the bottom of that range...   not so much the fact that things are just idle.



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Re: [PATCH 3/4] sched: introduce synchronized idle injection Morten Rasmussen <morten.rasmussen@arm.com> - 2015-11-18 16:50 +0100
  Re: [PATCH 3/4] sched: introduce synchronized idle injection Arjan van de Ven <arjan@linux.intel.com> - 2015-11-18 17:00 +0100
    Re: [PATCH 3/4] sched: introduce synchronized idle injection Morten Rasmussen <morten.rasmussen@arm.com> - 2015-11-19 18:30 +0100
      Re: [PATCH 3/4] sched: introduce synchronized idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-19 21:10 +0100
        Re: [PATCH 3/4] sched: introduce synchronized idle injection Thomas Gleixner <tglx@linutronix.de> - 2015-11-20 10:50 +0100
          Re: [PATCH 3/4] sched: introduce synchronized idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-20 11:30 +0100
            Re: [PATCH 3/4] sched: introduce synchronized idle injection Thomas Gleixner <tglx@linutronix.de> - 2015-11-20 12:00 +0100
              Re: [PATCH 3/4] sched: introduce synchronized idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-20 14:00 +0100
                Re: [PATCH 3/4] sched: introduce synchronized idle injection Thomas Gleixner <tglx@linutronix.de> - 2015-11-20 20:00 +0100
              Re: [PATCH 3/4] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-24 12:40 +0100
      Re: [PATCH 3/4] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-23 19:00 +0100

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