netdev - Re: [PATCH] Enhance AF_PACKET implementation to not require high order contiguous memory allocation (v2)

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Date:	Tue, 9 Nov 2010 13:07:32 -0800
From:	Maciej Żenczykowski <zenczykowski@...il.com>
To:	nhorman@...driver.com
Cc:	netdev@...r.kernel.org, davem@...emloft.net, eric.dumazet@...il.com
Subject: Re: [PATCH] Enhance AF_PACKET implementation to not require high
 order contiguous memory allocation (v2)

> +#define PGV_FROM_VMALLOC 1

Why don't we always just use vmalloc, what's the benefit of get_user_pages?

> +       /*
> +        * vmalloc failed, lets dig into swap here
> +        */
> +       *flags = 0;

probably better to *flags &= ~PGV_FROM_VMALLOC;
(since some flags could have been set before this function was called)

> +       gfp_flags &= ~__GFP_NORETRY;
> +       buffer = (char *)__get_free_pages(gfp_flags, order);

wouldn't this still cause problems because you're now requiring linear
memory again?
Would it be better to just fail at this point?
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