Subject: Re: [PATCH 10/17] netvm: Allow skb allocation to use PFMEMALLOC reserves

From: Sebastian Andrzej Siewior <[email-masked]>
Date: Fri, 22 Jun 2012 13:27:51 +0200

On Fri, Jun 22, 2012 at 11:54:51AM +0100, Mel Gorman wrote:
> > This is mostly used by nic to refil their RX skb pool. You add the
> > __GFP_MEMALLOC to the allocation to rise the change of a successfull refill
> > for the swap case.
> > A few drivers use build_skb() to create the skb. __netdev_alloc_skb()
> > shouldn't be affected since the allocation happens with GFP_ATOMIC. Looking at
> > TG3 it uses build_skb() and get_pages() / kmalloc(). Shouldn't this be some
> > considered?
> > 
> 
> While TG3 is not exactly as you describe after rebasing build_skb should
> make a similar check to __alloc_skb. As it is always used for RX allocation
> from the skbuff_head_cache cache the following should be suitable. Thanks.

As Eric pointed out you end up in netdev_alloc_frag() which is using
alloc_page(). This is also used by __netdev_alloc_skb().

Sebastian

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