Re: [PATCH 1/6] genirq: allow assigning affinity to present but not online CPUs

From	Christoph Hellwig <hch@lst.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH 1/6] genirq: allow assigning affinity to present but not online CPUs
Date	2017-02-05 17:50 +0100
Message-ID	<t7yaK-1kO-9@gated-at.bofh.it> (permalink)
References	<t7yaK-1kO-11@gated-at.bofh.it> <t7yaK-1kO-13@gated-at.bofh.it> <t7yaK-1kO-15@gated-at.bofh.it>
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Hi Joe,

On Fri, Feb 03, 2017 at 08:58:09PM -0500, Joe Korty wrote:
> IIRC, some years ago I ran across a customer system where
> the #cpus_present was twice as big as #cpus_possible.
> 
> Hyperthreading was turned off in the BIOS so it was not
> entirely out of line for the extra cpus to be declared
> present, even though none of them would ever be available
> for use.

This sounds like a system we should quirk around instead of optimizing
for it.  Unless I totally misunderstand the idea behind cpu_possible
and cpu_present.

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Re: [PATCH 1/6] genirq: allow assigning affinity to present but         not online CPUs Christoph Hellwig <hch@lst.de> - 2017-02-05 17:50 +0100
  Re: [PATCH 1/6] genirq: allow assigning affinity to present but not  online CPUs Keith Busch <keith.busch@intel.com> - 2017-02-06 18:00 +0100
    Re: [PATCH 1/6] genirq: allow assigning affinity to present but         not online CPUs Christoph Hellwig <hch@lst.de> - 2017-02-06 18:10 +0100

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