linux-kernel - Re: [PATCH] mm: add a "struct page_frag" type containing a page, offset and length

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Date:	Wed, 19 Oct 2011 22:36:30 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hch@...radead.org" <hch@...radead.org>,
	"jaxboe@...ionio.com" <jaxboe@...ionio.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] mm: add a "struct page_frag" type containing a page,
 offset and length

On Tue, 18 Oct 2011, Ian Campbell wrote:

> From 806b74572ad63e2ed3ca69bb5640a55dc4475e73 Mon Sep 17 00:00:00 2001
> From: Ian Campbell <ian.campbell@...rix.com>
> Date: Mon, 3 Oct 2011 16:46:54 +0100
> Subject: [PATCH] mm: add a "struct page_frag" type containing a page, offset and length
> 
> A few network drivers currently use skb_frag_struct for this purpose but I have
> patches which add additional fields and semantics there which these other uses
> do not want.
> 
> A structure for reference sub-page regions seems like a generally useful thing
> so do so instead of adding a network subsystem specific structure.
> 
> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
> Acked-by: Jens Axboe <jaxboe@...ionio.com>
> Acked-by: David Rientjes <rientjes@...gle.com>
> Cc: Christoph Hellwig <hch@...radead.org>
> Cc: David Miller <davem@...emloft.net>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
> [since v1: s/struct subpage/struct page_frag/ on advice from Christoph]
> [since v2: s/page_offset/offset/ on advice from Andrew]

Looks good, is this going to be going through net-next?

> ---
>  include/linux/mm_types.h |   11 +++++++++++
>  1 files changed, 11 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> index 774b895..29971a5 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -135,6 +135,17 @@ struct page {
>  #endif
>  ;
>  
> +struct page_frag {
> +	struct page *page;
> +#if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536)
> +	__u32 offset;
> +	__u32 size;
> +#else
> +	__u16 offset;
> +	__u16 size;
> +#endif
> +};
> +
>  typedef unsigned long __nocast vm_flags_t;
>  
>  /*
--
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