Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous systems

From	Steve Muckle <steve.muckle@linaro.org>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous systems
Date	2016-01-18 20:30 +0100
Message-ID	<qSnF0-566-9@gated-at.bofh.it> (permalink)
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On 01/18/2016 07:13 AM, Juri Lelli wrote:
>> DT solves these issues and would be the perfect place for this - we are
>> > defining the compute capacity of a CPU which is a property of the
>> > hardware. However there are a couple things forcing us to compromise.
>> > One is that the amount and detail of information required to adequately
>> > capture the computational abilities of a CPU across all possible
>> > workloads seem onerous to collect and enumerate. The second is that even
>> > if we were willing to undertake that, CPU vendors probably won't be
>> > forthcoming with that information.
>> > 
>
> You mean because they won't publish performance data of their hw?

More specific things like IPC and other architectural details that could
comprise a precise physical definition of a CPU that would meet the
ideal goals of a device tree definition.

> But we already use per platform normalized values (as you are proposing
> below). So that a platform to platform comparison doesn't make sense.

Yeah I'm just advocating for that strategy here.

cheers,
Steve

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Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Steve Muckle <steve.muckle@linaro.org> - 2016-01-15 21:00 +0100
  Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Juri Lelli <juri.lelli@arm.com> - 2016-01-18 16:20 +0100
    Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous systems Vincent Guittot <vincent.guittot@linaro.org> - 2016-01-18 17:20 +0100
      Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Juri Lelli <juri.lelli@arm.com> - 2016-01-18 17:40 +0100
        Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous systems Vincent Guittot <vincent.guittot@linaro.org> - 2016-01-18 17:50 +0100
          Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Juri Lelli <juri.lelli@arm.com> - 2016-01-18 18:10 +0100
            Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous systems Vincent Guittot <vincent.guittot@linaro.org> - 2016-01-18 18:30 +0100
          Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Catalin Marinas <catalin.marinas@arm.com> - 2016-01-19 12:10 +0100
            Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Juri Lelli <juri.lelli@arm.com> - 2016-01-19 12:30 +0100
              Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Juri Lelli <juri.lelli@arm.com> - 2016-01-19 15:30 +0100
                Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Steve Muckle <steve.muckle@linaro.org> - 2016-01-19 20:50 +0100
                Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Mark Brown <broonie@kernel.org> - 2016-01-19 22:20 +0100
                Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Juri Lelli <juri.lelli@arm.com> - 2016-01-20 11:30 +0100
    Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Steve Muckle <steve.muckle@linaro.org> - 2016-01-18 20:30 +0100

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