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SubjectRe: [PATCH] x86: numa: setup_node_data(): drop dead code and rename function
On Thu, 26 Jun 2014 10:51:11 -0400
Rik van Riel <riel@redhat.com> wrote:

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> On 06/19/2014 10:20 PM, Luiz Capitulino wrote:
>
> > @@ -523,8 +508,17 @@ static int __init numa_register_memblks(struct
> > numa_meminfo *mi) end = max(mi->blk[i].end, end); }
> >
> > - if (start < end) - setup_node_data(nid, start, end); + if
> > (start >= end) + continue; + + /* + * Don't confuse VM with a
> > node that doesn't have the + * minimum amount of memory: + */ +
> > if (end && (end - start) < NODE_MIN_SIZE) + continue; + +
> > alloc_node_data(nid); }
>
> Minor nit. If we skip a too-small node, should we remember that we
> did so, and add its memory to another node, assuming it is physically
> contiguous memory?

Interesting point. Honest question, please disregard if this doesn't
make sense: but won't this affect automatic numa performance? Because
the kernel won't know that that extra memory actually pertains to another
node and hence that extra memory will have a difference distance of the
node that's making use it of it.

If my thinking is wrong or if even then you believe this is a good feature,
I can work on it on a different patch, as this check is not being introduced
by this patch. Although I also wonder how many numa machines have such small
nodes...

> Other than that...
>
> Acked-by: Rik van Riel <riel@redhat.com>

Thanks!

>
> - --
> All rights reversed
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