Re: [PATCH v3 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA

Michal Hocko
2020-03-30T07:44:33Z

On Sun 29-03-20 08:19:24, Baoquan He wrote:
> On 03/28/20 at 11:31am, Hoan Tran wrote:
> > In NUMA layout which nodes have memory ranges that span across other nodes,
> > the mm driver can detect the memory node id incorrectly.
> >
> > For example, with layout below
> > Node 0 address: 0000 xxxx 0000 xxxx
> > Node 1 address: xxxx 1111 xxxx 1111
>
> Sorry, I read this example several times, but still don't get what it
> means. Can it be given with real hex number address as an exmaple? I
> mean just using the memory layout you have seen from some systems. The
> change looks interesting though.

Does this make it more clear?
physical address range and its node associaion
[0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1]
--
Michal Hocko
SUSE Labs