netdev - Re: [PATCH net-next] net: use bigger pages in __netdev_alloc

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Message-ID: <1348676085.5093.361.camel@edumazet-glaptop>
Date:	Wed, 26 Sep 2012 18:14:45 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Duyck <alexander.h.duyck@...el.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net: use bigger pages in __netdev_alloc_frag

On Wed, 2012-09-26 at 09:00 -0700, Alexander Duyck wrote:

> One minor thought.  Instead of tracking offset and size why not just
> work from the top down instead of the bottom up?
> 
> So instead of starting with the frag offset at 0, why not start it at
> PAGE_SIZE << order, and then work your way down to 0.  That way you
> don't need to track both size and offset.
> 

How do you refill then ? 

(ie setting xxx->offset back to PAGE_SIZE << order)

I am not sure we have direct access to a page order given a struct page
pointer.

I also like struct page_frag abstraction, because it might allow us
better code factorization with other frag allocators.

( skb_append_datato_frags(), sk_page_frag_refill(), ...)




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