On Wed, 27 Apr 2011 17:08:06 +0100 Mel Gorman <mgorman@xxxxxxx> wrote:
> @@ -1578,7 +1589,7 @@ static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev,
> */
> static inline struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask)
> {
> - return alloc_pages_node(NUMA_NO_NODE, gfp_mask, 0);
> + return alloc_pages_node(NUMA_NO_NODE, gfp_mask | __GFP_MEMALLOC, 0);
> }
>
I'm puzzling a bit over this change.
__netdev_alloc_page appears to be used to get pages to put in ring buffer
for a network card to DMA received packets into. So it is OK to use
__GFP_MEMALLOC for these allocations providing we mark the resulting skb as
'pfmemalloc' if a reserved page was used.
However I don't see where that marking is done.
I think it should be in skb_fill_page_desc, something like:
if (page->pfmemalloc)
skb->pfmemalloc = true;
Is this covered somewhere else that I am missing?
Thanks,
NeilBrown
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