Messages in this thread | | | Date | Wed, 16 Jun 2021 13:39:05 +0200 | From | Peter Zijlstra <> | Subject | Re: sched: Question about big and little cores system with SMP and EAS |
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On Wed, Jun 16, 2021 at 07:29:26PM +0800, Ley Foon Tan wrote: > Hi all > > Would like to ask the experts here regarding the Symmetric > Multi-Processing mode (SMP) with Energy aware scheduler (EAS) support > on the big + little cores system.
And the you ask a question unrelated to either Symmetric MP or EAS :-)
> Hardware system: > Big and little cores have almost the same ISA, but the big core has > some extension instructions that little core doesn't have.
That problem is unrelated to big.Little / EAS, also by definition that is not SMP seeing how the 'S' is a blatant lie.
The simplest solution is to simply disallow usage of the extended ISA and force mandate the common subset. The complicated answer is something along the lines of:
https://lkml.kernel.org/r/20210608180313.11502-1-will@kernel.org
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