Re: [PATCH 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

[Christopher Lameter]

On Mon, 16 Mar 2020, Michal Hocko wrote:

> > We can dynamically number the nodes right? So just make sure that the
> > firmware properly creates memory on node 0?
>
> Are you suggesting that the OS would renumber NUMA nodes coming
> from FW just to satisfy node 0 existence? If yes then I believe this is
> really a bad idea because it would make HW/LPAR configuration matching
> to the resulting memory layout really hard to follow.

NUMA nodes are created by the OS based on information provided by the
firmware. Either the FW would need to ensure that a viable node 0 exists
or the bootstrap arch code could setup things to the same effect.