On Fri, 9 Nov 2007, Mel Gorman wrote:
> struct page * fastcall
> __alloc_pages(gfp_t gfp_mask, unsigned int order,
> struct zonelist *zonelist)
> {
> + /*
> + * Use a temporary nodemask for __GFP_THISNODE allocations. If the
> + * cost of allocating on the stack or the stack usage becomes
> + * noticable, allocate the nodemasks per node at boot or compile time
> + */
> + if (unlikely(gfp_mask & __GFP_THISNODE)) {
> + nodemask_t nodemask;
Hmmm.. This places a potentially big structure on the stack. nodemask can
contain up to 1024 bits which means 128 bytes. Maybe keep an array of
gfp_thisnode nodemasks (node_nodemask?) and use node_nodemask[nid]?
> +
> + return __alloc_pages_internal(gfp_mask, order,
> + zonelist, nodemask_thisnode(numa_node_id(), &nodemask));
Argh.... GFP_THISNODE must use the nid passed to alloc_pages_node and
*not* the local numa node id. Only if the node specified to alloc_pages
nodes is -1 will this work.
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