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Re: [PATCH 03/11] sched: Extend scheduler's asym packing

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH 03/11] sched: Extend scheduler's asym packing
Date 2016-08-25 15:50 +0200
Message-ID <sa3cB-1AH-1@gated-at.bofh.it> (permalink)
References <s7GtS-7go-115@gated-at.bofh.it> <s7GDv-7k3-29@gated-at.bofh.it> <sa117-jg-13@gated-at.bofh.it> <sa1kt-qZ-3@gated-at.bofh.it> <sa2Tf-1tU-15@gated-at.bofh.it>
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On Thu, Aug 25, 2016 at 02:18:37PM +0100, Morten Rasmussen wrote:

> But why not just pass the customized list into the scheduler? Seems
> simpler?

Mostly because I didn't want to regress Power I suppose. The ITMT stuff
needs an extra load, whereas the Power stuff can use the CPU number we
already have.

Also, since we need an interface to pass in this custom list, I don't
see the distinction, you can do the same manipulation by constantly
updating the prio list.

But not of this stuff should be EXPORT'ed, so its only available to the
core kernel, which greatly limits the potential for abuse. We can see
arch code just fine.

And if you spin a custom kernel, you can already wreck the load
balancer.

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Thread

[PATCH 03/11] sched: Extend scheduler's asym packing Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-08-19 03:20 +0200
  Re: [PATCH 03/11] sched: Extend scheduler's asym packing Morten Rasmussen <morten.rasmussen@arm.com> - 2016-08-25 13:30 +0200
    Re: [PATCH 03/11] sched: Extend scheduler's asym packing Peter Zijlstra <peterz@infradead.org> - 2016-08-25 13:50 +0200
      Re: [PATCH 03/11] sched: Extend scheduler's asym packing Morten Rasmussen <morten.rasmussen@arm.com> - 2016-08-25 15:30 +0200
        Re: [PATCH 03/11] sched: Extend scheduler's asym packing Peter Zijlstra <peterz@infradead.org> - 2016-08-25 15:50 +0200
          Re: [PATCH 03/11] sched: Extend scheduler's asym packing Morten Rasmussen <morten.rasmussen@arm.com> - 2016-08-26 12:40 +0200
            Re: [PATCH 03/11] sched: Extend scheduler's asym packing Peter Zijlstra <peterz@infradead.org> - 2016-08-26 14:50 +0200
              Re: [PATCH 03/11] sched: Extend scheduler's asym packing Tim Chen <tim.c.chen@linux.intel.com> - 2016-08-26 19:30 +0200
                Re: [PATCH 03/11] sched: Extend scheduler's asym packing Tim Chen <tim.c.chen@linux.intel.com> - 2016-08-27 01:20 +0200

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