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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH 01/10] net: Use cached copy of pfmemalloc to avoid
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Date: Sun, 10 May 2015 20:52:13 -0400 (EDT)
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From: Alexander Duyck <alexander.duyck@gmail.com>
Date: Sun, 10 May 2015 17:01:15 -0700

> The reason for the difference between the two is that in the case of
> netdev_alloc_skb/frag the netdev_alloc_cache can only be accessed with
> IRQs disabled, whereas in the napi_alloc_skb case we can access the
> napi_alloc_cache at any point in the function.  Either way I am going
> to be stuck with differences because of the local_irq_save/restore
> that must be called when accessing the page frag cache that doesn't
> exist in the napi case.

I see, thanks for explaining.