netdev - Re: [PATCH 5/6] net: add paged frag destructor support to kernel

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Date:	Thu, 05 Jan 2012 14:15:22 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ian.campbell@...rix.com
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com,
	kuznet@....inr.ac.ru, pekkas@...core.fi, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	Trond.Myklebust@...app.com, gregkh@...e.de,
	drbd-user@...ts.linbit.com, devel@...verdev.osuosl.org,
	cluster-devel@...hat.com, ocfs2-devel@....oracle.com,
	ceph-devel@...r.kernel.org, rds-devel@....oracle.com,
	linux-nfs@...r.kernel.org
Subject: Re: [PATCH 5/6] net: add paged frag destructor support to
 kernel_sendpage.

From: Ian Campbell <ian.campbell@...rix.com>
Date: Thu, 5 Jan 2012 17:13:43 +0000

> -static ssize_t do_tcp_sendpages(struct sock *sk, struct page **pages, int poffset,
> +static ssize_t do_tcp_sendpages(struct sock *sk,
> +				struct page **pages,
> +				struct skb_frag_destructor **destructors,
> +				int poffset,
>  			 size_t psize, int flags)
>  {
>  	struct tcp_sock *tp = tcp_sk(sk);

An array of destructors is madness, and the one call site that specifies this
passes an address of a single entry.

This also would never even have to occur if you put the destructor inside of
struct page instead.

Finally, except for the skb_shared_info() layout optimization in patch #1 which
I alreayd applied, this stuff is not baked enough for the 3.3 merge window.
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