linux-kernel - Re: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO

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Message-ID: <20190926121007.GB4581@hirez.programming.kicks-ass.net>
Date:   Thu, 26 Sep 2019 14:10:07 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Yunsheng Lin <linyunsheng@...wei.com>, catalin.marinas@....com,
        will@...nel.org, mingo@...hat.com, bp@...en8.de, rth@...ddle.net,
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Subject: Re: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware

On Thu, Sep 26, 2019 at 11:05:59AM +0200, Peter Zijlstra wrote:
> On Wed, Sep 25, 2019 at 11:45:26PM +0200, Peter Zijlstra wrote:
> > [    7.149889] [Firmware Bug]: device: 'pci0000:7f': no node assigned on NUMA capable HW
> > [    7.882888] [Firmware Bug]: device: 'pci0000:ff': no node assigned on NUMA capable HW
> 
> Going by the limited number of intel numa boxes I have, it looks like:
> 
>   socket = (~busid) >> (8-n)

Bah, I got my notes mixed up, it should be: busid >> (8-n)

> where 'n' is the number of bits required to encode the largest socket
> id, ie 1 for 2-socket and 2 for 4 socket.
> 
> For 8 socket systems we start using pci domains, and things get more
> 'interesting' :/