On Fri, 24 Jul 2015, Vlastimil Babka wrote:
> diff --git a/include/linux/gfp.h b/include/linux/gfp.h
> index 531c72d..104a027 100644
> --- a/include/linux/gfp.h
> +++ b/include/linux/gfp.h
> @@ -321,8 +321,12 @@ static inline struct page *alloc_pages_node(int nid,
> gfp_t gfp_mask,
> unsigned int order)
> {
> /* Unknown node is current (or closest) node */
> - if (nid == NUMA_NO_NODE)
> + if (nid == NUMA_NO_NODE) {
> nid = numa_mem_id();
> + } else if (!node_online(nid)) {
> + VM_WARN_ON(!node_online(nid));
> + nid = numa_mem_id();
> + }
I would think you would only want this for debugging purposes. The
overwhelming majority of hardware out there has no memory
onlining/offlining capability after all and this adds the overhead to each
call to alloc_pages_node.
Make this dependo n CONFIG_VM_DEBUG or some such thing?
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